android/app/src/main/java/com/example/petstoremobile/adapters/MessageAdapter.java

@@ -22,9 +22,15 @@ public class MessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
     private static final int TYPE_SENT = 1;
     private static final int TYPE_RECEIVED = 2;
 
+    public interface OnAttachmentClickListener {
+        void onAttachmentClick(Message message);
+    }
+
     private final List<Message> messages;
     private Long currentUserId;
     private String token;
+    private String baseUrl;
+    private OnAttachmentClickListener attachmentClickListener;
 
     public MessageAdapter(List<Message> messages, Long currentUserId) {
         this.messages = messages;
@@ -40,6 +46,14 @@ public class MessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
         this.token = token;
     }
 
+    public void setBaseUrl(String baseUrl) {
+        this.baseUrl = baseUrl;
+    }
+
+    public void setOnAttachmentClickListener(OnAttachmentClickListener listener) {
+        this.attachmentClickListener = listener;
+    }
+
     @Override
     public int getItemViewType(int position) {
         Message m = messages.get(position);
@@ -64,8 +78,8 @@ public class MessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
     @Override
     public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
         Message m = messages.get(position);
-        if (holder instanceof SentHolder)     ((SentHolder) holder).bind(m, token);
-        if (holder instanceof ReceivedHolder) ((ReceivedHolder) holder).bind(m, token);
+        if (holder instanceof SentHolder)     ((SentHolder) holder).bind(m, token, baseUrl, attachmentClickListener);
+        if (holder instanceof ReceivedHolder) ((ReceivedHolder) holder).bind(m, token, baseUrl, attachmentClickListener);
     }
 
     @Override public int getItemCount() { return messages.size(); }
@@ -76,9 +90,23 @@ public class MessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
             super(binding.getRoot());
             this.binding = binding;
         }
-        void bind(Message m, String token) {
-            binding.tvMessageContent.setText(m.getContent());
-            displayAttachment(m, binding.ivAttachment, binding.tvAttachmentName, token);
+        void bind(Message m, String token, String baseUrl, OnAttachmentClickListener listener) {
+            // Check for Text
+            if (m.getContent() != null && !m.getContent().isEmpty()) {
+                binding.tvMessageContent.setVisibility(View.VISIBLE);
+                binding.tvMessageContent.setText(m.getContent());
+            } else {
+                binding.tvMessageContent.setVisibility(View.GONE);
+            }
+            
+            // Check for Attachment
+            displayAttachment(m, binding.ivAttachment, binding.tvAttachmentName, token, baseUrl);
+            
+            View.OnClickListener click = v -> {
+                if (listener != null) listener.onAttachmentClick(m);
+            };
+            binding.ivAttachment.setOnClickListener(click);
+            binding.tvAttachmentName.setOnClickListener(click);
         }
     }
 
@@ -88,22 +116,52 @@ public class MessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
             super(binding.getRoot());
             this.binding = binding;
         }
-        void bind(Message m, String token) {
-            binding.tvMessageContent.setText(m.getContent());
-            displayAttachment(m, binding.ivAttachment, binding.tvAttachmentName, token);
+        void bind(Message m, String token, String baseUrl, OnAttachmentClickListener listener) {
+            // Check for Text
+            if (m.getContent() != null && !m.getContent().isEmpty()) {
+                binding.tvMessageContent.setVisibility(View.VISIBLE);
+                binding.tvMessageContent.setText(m.getContent());
+            } else {
+                binding.tvMessageContent.setVisibility(View.GONE);
+            }
+
+            // Check for Attachment
+            displayAttachment(m, binding.ivAttachment, binding.tvAttachmentName, token, baseUrl);
+
+            View.OnClickListener click = v -> {
+                if (listener != null) listener.onAttachmentClick(m);
+            };
+            binding.ivAttachment.setOnClickListener(click);
+            binding.tvAttachmentName.setOnClickListener(click);
         }
     }
 
     // helper function to display the attachment to the chat bubble
-    private static void displayAttachment(Message m, ImageView iv, TextView tvName, String token) {
-        if (m.getAttachmentUrl() != null) {
-            if (m.getAttachmentType() != null && m.getAttachmentType().startsWith("image/")) {
+    private static void displayAttachment(Message m, ImageView iv, TextView tvName, String token, String baseUrl) {
+        // Check if there's an attachment by looking at name or mime type
+        if (m.getAttachmentName() != null || m.getAttachmentMimeType() != null) {
+            // Construct the download URL using the message ID
+            String url;
+            if (baseUrl != null) {
+                String cleanBase = baseUrl.endsWith("/") ? baseUrl.substring(0, baseUrl.length() - 1) : baseUrl;
+                url = cleanBase + "/api/v1/chat/messages/" + m.getId() + "/attachment";
+            } else {
+                url = m.getAttachmentUrl(); // Fallback
+            }
+
+            if (url == null) {
+                iv.setVisibility(View.GONE);
+                tvName.setVisibility(View.GONE);
+                return;
+            }
+
+            if (m.getAttachmentMimeType() != null && m.getAttachmentMimeType().startsWith("image/")) {
                 iv.setVisibility(View.VISIBLE);
                 tvName.setVisibility(View.GONE);
 
-                Object loadTarget = m.getAttachmentUrl();
-                if (token != null && m.getAttachmentUrl().startsWith("http")) {
-                    loadTarget = new GlideUrl(m.getAttachmentUrl(), new LazyHeaders.Builder()
+                Object loadTarget = url;
+                if (token != null) {
+                    loadTarget = new GlideUrl(url, new LazyHeaders.Builder()
                             .addHeader("Authorization", "Bearer " + token)
                             .build());
                 }

android/app/src/main/java/com/example/petstoremobile/api/CustomerApi.java

@@ -1,6 +1,7 @@
 package com.example.petstoremobile.api;
 
 import com.example.petstoremobile.dtos.CustomerDTO;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PageResponse;
 
 import java.util.List;
@@ -18,4 +19,7 @@ public interface CustomerApi {
 
     @GET("api/v1/customers/{customerId}")
     Call<CustomerDTO> getCustomerById(@Path("customerId") Long customerId);
+
+    @GET("api/v1/dropdowns/customers")
+    Call<List<DropdownDTO>> getCustomerDropdowns();
 }

android/app/src/main/java/com/example/petstoremobile/api/MessageApi.java

@@ -3,11 +3,17 @@ package com.example.petstoremobile.api;
 import com.example.petstoremobile.dtos.MessageDTO;
 import com.example.petstoremobile.dtos.SendMessageRequest;
 import java.util.List;
+
+import okhttp3.MultipartBody;
+import okhttp3.ResponseBody;
 import retrofit2.Call;
 import retrofit2.http.Body;
 import retrofit2.http.GET;
+import retrofit2.http.Multipart;
 import retrofit2.http.POST;
+import retrofit2.http.Part;
 import retrofit2.http.Path;
+import retrofit2.http.Streaming;
 
 //api calls to get and send messages
 public interface MessageApi {
@@ -17,4 +23,16 @@ public interface MessageApi {
 
     @POST("api/v1/chat/conversations/{id}/messages")
     Call<MessageDTO> sendMessage(@Path("id") Long conversationId, @Body SendMessageRequest request);
+
+    @Multipart
+    @POST("api/v1/chat/conversations/{id}/attachments")
+    Call<MessageDTO> sendMessageWithAttachment(
+            @Path("id") Long conversationId,
+            @Part MultipartBody.Part content,
+            @Part MultipartBody.Part file
+    );
+
+    @GET("api/v1/chat/messages/{id}/attachment")
+    @Streaming
+    Call<ResponseBody> downloadAttachment(@Path("id") Long messageId);
 }

android/app/src/main/java/com/example/petstoremobile/api/PetApi.java

@@ -1,9 +1,12 @@
 package com.example.petstoremobile.api;
 
 import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PageResponse;
 import com.example.petstoremobile.dtos.PetDTO;
 
+import java.util.List;
+
 import okhttp3.MultipartBody;
 import retrofit2.Call;
 import retrofit2.http.Body;
@@ -31,9 +34,16 @@ public interface PetApi {
             @Query("status") String status,
             @Query("species") String species,
             @Query("storeId") Long storeId,
+            @Query("customerId") Long customerId,
             @Query("sort") String sort
     );
 
+    @GET("api/v1/dropdowns/customers/{customerId}/pets")
+    Call<List<DropdownDTO>> getCustomerPets(@Path("customerId") Long customerId);
+
+    @GET("api/v1/dropdowns/adoption-pets")
+    Call<List<DropdownDTO>> getAdoptionPets();
+
     // Get pet by id
     @GET("api/v1/pets/{id}")
     Call<PetDTO> getPetById(@Path("id") Long id);

android/app/src/main/java/com/example/petstoremobile/api/StoreApi.java

@@ -1,10 +1,14 @@
 package com.example.petstoremobile.api;
 
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PageResponse;
 import com.example.petstoremobile.dtos.StoreDTO;
 
+import java.util.List;
+
 import retrofit2.Call;
 import retrofit2.http.GET;
+import retrofit2.http.Path;
 import retrofit2.http.Query;
 
 public interface StoreApi {
@@ -13,4 +17,10 @@ public interface StoreApi {
     Call<PageResponse<StoreDTO>> getAllStores(
             @Query("page") int page,
             @Query("size") int size);
+
+    @GET("api/v1/dropdowns/stores")
+    Call<List<DropdownDTO>> getStoreDropdowns();
+
+    @GET("api/v1/dropdowns/stores/{storeId}/employees")
+    Call<List<DropdownDTO>> getStoreEmployees(@Path("storeId") Long storeId);
 }

android/app/src/main/java/com/example/petstoremobile/di/NetworkModule.java

@@ -55,7 +55,7 @@ public class NetworkModule {
     @Singleton
     public static OkHttpClient provideOkHttpClient(TokenManager tokenManager) {
         HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
-        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
+        interceptor.setLevel(HttpLoggingInterceptor.Level.HEADERS);
 
         return new OkHttpClient.Builder()
                 .addInterceptor(interceptor)
@@ -191,4 +191,4 @@ public class NetworkModule {
     public static RefundApi provideRefundApi(Retrofit retrofit) {
         return retrofit.create(RefundApi.class);
     }
-}
+}

android/app/src/main/java/com/example/petstoremobile/dtos/ConversationDTO.java

@@ -12,6 +12,14 @@ public class ConversationDTO {
 
     public ConversationDTO() {}
 
+    public ConversationDTO(Long id, Long customerId, Long staffId, String lastMessage, String status) {
+        this.id = id;
+        this.customerId = customerId;
+        this.staffId = staffId;
+        this.lastMessage = lastMessage;
+        this.status = status;
+    }
+
     public Long getId() {
         return id;
     }

android/app/src/main/java/com/example/petstoremobile/dtos/DropdownDTO.java

@@ -0,0 +1,29 @@
+package com.example.petstoremobile.dtos;
+
+public class DropdownDTO {
+    private Long id;
+    private String label;
+
+    public DropdownDTO() {}
+
+    public DropdownDTO(Long id, String label) {
+        this.id = id;
+        this.label = label;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
+}

android/app/src/main/java/com/example/petstoremobile/dtos/MessageDTO.java

@@ -28,8 +28,11 @@ public class MessageDTO {
     @SerializedName("attachmentName")
     private String attachmentName;
 
-    @SerializedName("attachmentType")
-    private String attachmentType;
+    @SerializedName("attachmentMimeType")
+    private String attachmentMimeType;
+
+    @SerializedName("attachmentSizeBytes")
+    private Long attachmentSizeBytes;
 
     public MessageDTO() {}
 
@@ -57,6 +60,9 @@ public class MessageDTO {
     public String getAttachmentName() { return attachmentName; }
     public void setAttachmentName(String attachmentName) { this.attachmentName = attachmentName; }
 
-    public String getAttachmentType() { return attachmentType; }
-    public void setAttachmentType(String attachmentType) { this.attachmentType = attachmentType; }
+    public String getAttachmentMimeType() { return attachmentMimeType; }
+    public void setAttachmentMimeType(String attachmentMimeType) { this.attachmentMimeType = attachmentMimeType; }
+
+    public Long getAttachmentSizeBytes() { return attachmentSizeBytes; }
+    public void setAttachmentSizeBytes(Long attachmentSizeBytes) { this.attachmentSizeBytes = attachmentSizeBytes; }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/ChatFragment.java

@@ -1,15 +1,27 @@
 package com.example.petstoremobile.fragments;
 
 import android.app.Activity;
+import android.app.Dialog;
+import android.content.ContentValues;
 import android.content.Intent;
-import android.database.Cursor;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
-import android.provider.OpenableColumns;
+import android.os.Environment;
+import android.provider.MediaStore;
 import android.util.Log;
-import android.view.*;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
 import android.widget.Toast;
+
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.activity.result.contract.ActivityResultContracts;
 import androidx.annotation.NonNull;
@@ -17,6 +29,7 @@ import androidx.core.view.GravityCompat;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
+
 import com.bumptech.glide.Glide;
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.adapters.ChatAdapter;
@@ -25,20 +38,32 @@ import com.example.petstoremobile.api.auth.TokenManager;
 import com.example.petstoremobile.databinding.FragmentChatBinding;
 import com.example.petstoremobile.dtos.ConversationDTO;
 import com.example.petstoremobile.dtos.MessageDTO;
-import com.example.petstoremobile.dtos.SendMessageRequest;
 import com.example.petstoremobile.models.Chat;
 import com.example.petstoremobile.models.Message;
 import com.example.petstoremobile.services.ChatNotificationService;
+import com.example.petstoremobile.utils.DialogUtils;
+import com.example.petstoremobile.utils.FileUtils;
+import com.example.petstoremobile.utils.GlideUtils;
 import com.example.petstoremobile.utils.Resource;
-import com.example.petstoremobile.viewmodels.ChatViewModel;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.ChatListViewModel;
 import com.example.petstoremobile.websocket.StompChatManager;
 
-import java.util.*;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
 
 import javax.inject.Inject;
 import javax.inject.Named;
 
 import dagger.hilt.android.AndroidEntryPoint;
+import okhttp3.MediaType;
+import okhttp3.MultipartBody;
+import okhttp3.RequestBody;
+import okhttp3.ResponseBody;
 
 @AndroidEntryPoint
 public class ChatFragment extends Fragment implements ChatAdapter.OnChatClickListener, StompChatManager.MessageListener,
@@ -47,59 +72,46 @@ public class ChatFragment extends Fragment implements ChatAdapter.OnChatClickLis
     private static final String TAG = "ChatFragment";
 
     private FragmentChatBinding binding;
-    private ChatViewModel viewModel;
+    private ChatListViewModel viewModel;
 
-    // Adapters
-    private ChatAdapter chatAdapter;
+    private ChatAdapter activeChatAdapter;
+    private ChatAdapter closedChatAdapter;
     private MessageAdapter messageAdapter;
 
-    // Data
-    private final List<Chat> chatList = new ArrayList<>();
+    private final List<Chat> activeChatList = new ArrayList<>();
+    private final List<Chat> closedChatList = new ArrayList<>();
     private final List<Message> messageList = new ArrayList<>();
-    private final Map<Long, String> customerNames = new HashMap<>();
     private Uri pendingAttachmentUri;
 
     @Inject TokenManager tokenManager;
     @Inject @Named("baseUrl") String baseUrl;
 
-    // chat
-    private Long currentUserId;
     private Long activeConversationId;
     private StompChatManager stompChatManager;
     private ActivityResultLauncher<Intent> attachmentLauncher;
 
-    /**
-     * Initializes the attachment launcher to handle file selection from the gallery.
-     */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(ChatViewModel.class);
+        viewModel = new ViewModelProvider(requireActivity()).get(ChatListViewModel.class);
         attachmentLauncher = registerForActivityResult(
                 new ActivityResultContracts.StartActivityForResult(),
                 result -> {
                     if (result.getResultCode() == Activity.RESULT_OK && result.getData() != null) {
                         Uri uri = result.getData().getData();
-                        if (uri != null) {
-                            showAttachmentPreview(uri);
-                        }
+                        if (uri != null) showAttachmentPreview(uri);
                     }
                 }
         );
     }
 
-    /**
-     * Inflates the layout, initializes UI components, and sets up click listeners for messaging.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater,
                              ViewGroup container, Bundle savedInstanceState) {
-
         binding = FragmentChatBinding.inflate(inflater, container, false);
 
         binding.btnHamburger.setOnClickListener(v -> binding.chatDrawerLayout.openDrawer(GravityCompat.START));
 
-        // Set editor action listener for message field to send when enter is pressed
         binding.etMessage.setOnEditorActionListener((v, actionId, event) -> {
             if (actionId == EditorInfo.IME_ACTION_SEND || actionId == EditorInfo.IME_NULL) {
                 binding.btnSend.performClick();
@@ -108,63 +120,208 @@ public class ChatFragment extends Fragment implements ChatAdapter.OnChatClickLis
             return false;
         });
 
-        //When the send button is clicked check if there is an attachment and send using the correct helper function
         binding.btnSend.setOnClickListener(v -> {
-            if (pendingAttachmentUri != null) {
-                sendWithAttachment(pendingAttachmentUri);
-            } else {
-                sendMessage();
-            }
+            if (pendingAttachmentUri != null) sendWithAttachment(pendingAttachmentUri);
+            else sendMessage();
         });
 
-        //When the attachment button is clicked open the file picker
         binding.btnAttach.setOnClickListener(v -> selectAttachment());
         binding.btnRemoveAttachment.setOnClickListener(v -> removeAttachment());
 
+        setupDrawerToggles();
         setupRecyclerViews();
+        observeViewModel();
         loadInitialData();
 
         return binding.getRoot();
     }
 
-    /**
-     * Configures the RecyclerViews for the conversation list and the message history.
-     */
-    private void setupRecyclerViews() {
-        // Set up Drawer menu to select conversation
-        chatAdapter = new ChatAdapter(chatList, this);
-        binding.rvChatList.setLayoutManager(new LinearLayoutManager(getContext()));
-        binding.rvChatList.setAdapter(chatAdapter);
+    private void setupDrawerToggles() {
+        binding.headerActiveChats.setOnClickListener(v -> {
+            if (binding.rvActiveChats.getVisibility() == View.VISIBLE) {
+                binding.rvActiveChats.setVisibility(View.GONE);
+                binding.ivActiveChevron.setImageResource(android.R.drawable.arrow_down_float);
+            } else {
+                binding.rvActiveChats.setVisibility(View.VISIBLE);
+                binding.ivActiveChevron.setImageResource(android.R.drawable.arrow_up_float);
+            }
+        });
+
+        binding.headerClosedChats.setOnClickListener(v -> {
+            if (binding.rvClosedChats.getVisibility() == View.VISIBLE) {
+                binding.rvClosedChats.setVisibility(View.GONE);
+                binding.ivClosedChevron.setImageResource(android.R.drawable.arrow_down_float);
+            } else {
+                binding.rvClosedChats.setVisibility(View.VISIBLE);
+                binding.ivClosedChevron.setImageResource(android.R.drawable.arrow_up_float);
+            }
+        });
+    }
+
+    private void setupRecyclerViews() {
+        activeChatAdapter = new ChatAdapter(activeChatList, this);
+        binding.rvActiveChats.setLayoutManager(new LinearLayoutManager(getContext()));
+        binding.rvActiveChats.setAdapter(activeChatAdapter);
+
+        closedChatAdapter = new ChatAdapter(closedChatList, this);
+        binding.rvClosedChats.setLayoutManager(new LinearLayoutManager(getContext()));
+        binding.rvClosedChats.setAdapter(closedChatAdapter);
 
-        // set up RecyclerView for selected chat to show messages
         messageAdapter = new MessageAdapter(messageList, null);
+        messageAdapter.setBaseUrl(baseUrl);
+
+        messageAdapter.setOnAttachmentClickListener(message -> {
+            if (message.getAttachmentMimeType() != null && message.getAttachmentMimeType().startsWith("image/")) {
+                showFullScreenImage(message);
+            } else {
+                downloadFile(message);
+            }
+        });
+
         LinearLayoutManager lm = new LinearLayoutManager(getContext());
         lm.setStackFromEnd(true);
         binding.rvMessages.setLayoutManager(lm);
         binding.rvMessages.setAdapter(messageAdapter);
-        setConversationActive(false);
+        setConversationActive(false, null);
+    }
+
+    private void showFullScreenImage(Message message) {
+        if (baseUrl == null || message.getId() == null) return;
+
+        Dialog dialog = new Dialog(requireContext(), android.R.style.Theme_Black_NoTitleBar_Fullscreen);
+        dialog.setContentView(R.layout.dialog_full_screen_image);
+
+        ImageView imageView = dialog.findViewById(R.id.ivFullScreen);
+        ImageButton closeButton = dialog.findViewById(R.id.btnClose);
+        ImageButton downloadButton = dialog.findViewById(R.id.btnDownload);
+
+        String cleanBase = baseUrl.endsWith("/") ? baseUrl.substring(0, baseUrl.length() - 1) : baseUrl;
+        String downloadUrl = cleanBase + "/api/v1/chat/messages/" + message.getId() + "/attachment";
+
+        GlideUtils.loadImageWithToken(requireContext(), imageView, downloadUrl, tokenManager.getToken(), R.drawable.placeholder);
+
+        closeButton.setOnClickListener(v -> dialog.dismiss());
+        downloadButton.setOnClickListener(v -> downloadFile(message));
+        imageView.setOnClickListener(v -> dialog.dismiss());
+        dialog.show();
+    }
+
+    private void downloadFile(Message message) {
+        if (message.getId() == null) return;
+
+        DialogUtils.showConfirmDialog(requireContext(), "Download Attachment",
+                "Do you want to download \"" + message.getAttachmentName() + "\"?", () -> {
+            Toast.makeText(requireContext(), "Downloading " + message.getAttachmentName() + "...", Toast.LENGTH_SHORT).show();
+
+            viewModel.downloadAttachment(message.getId()).observe(getViewLifecycleOwner(), resource -> {
+                if (resource == null) return;
+                setLoading(resource.status == Resource.Status.LOADING);
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    saveFileToDownloads(resource.data, message.getAttachmentName(), message.getAttachmentMimeType());
+                } else if (resource.status == Resource.Status.ERROR) {
+                    Toast.makeText(requireContext(), "Download failed: " + resource.message, Toast.LENGTH_SHORT).show();
+                }
+            });
+        });
+    }
+
+    private void saveFileToDownloads(ResponseBody body, String fileName, String mimeType) {
+        try {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                ContentValues values = new ContentValues();
+                values.put(MediaStore.Downloads.DISPLAY_NAME, fileName);
+                values.put(MediaStore.Downloads.MIME_TYPE, mimeType);
+                values.put(MediaStore.Downloads.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS);
+
+                Uri uri = requireContext().getContentResolver().insert(MediaStore.Downloads.EXTERNAL_CONTENT_URI, values);
+                if (uri != null) {
+                    try (OutputStream outputStream = requireContext().getContentResolver().openOutputStream(uri);
+                         InputStream inputStream = body.byteStream()) {
+                        byte[] buffer = new byte[4096];
+                        int bytesRead;
+                        while ((bytesRead = inputStream.read(buffer)) != -1) {
+                            outputStream.write(buffer, 0, bytesRead);
+                        }
+                        Toast.makeText(requireContext(), "File saved to Downloads", Toast.LENGTH_SHORT).show();
+                    }
+                }
+            } else {
+                File downloadsDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
+                File file = new File(downloadsDir, fileName);
+                try (OutputStream outputStream = new FileOutputStream(file);
+                     InputStream inputStream = body.byteStream()) {
+                    byte[] buffer = new byte[4096];
+                    int bytesRead;
+                    while ((bytesRead = inputStream.read(buffer)) != -1) {
+                        outputStream.write(buffer, 0, bytesRead);
+                    }
+                    Toast.makeText(requireContext(), "File saved to Downloads: " + file.getAbsolutePath(), Toast.LENGTH_LONG).show();
+                }
+            }
+            body.close();
+        } catch (Exception e) {
+            Log.e(TAG, "Error saving file", e);
+            Toast.makeText(requireContext(), "Error saving file", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private void observeViewModel() {
+        viewModel.getActiveChats().observe(getViewLifecycleOwner(), list -> {
+            activeChatList.clear();
+            activeChatList.addAll(list);
+            activeChatAdapter.notifyDataSetChanged();
+            updateTitleAndStateIfActive(list);
+        });
+
+        viewModel.getClosedChats().observe(getViewLifecycleOwner(), list -> {
+            closedChatList.clear();
+            closedChatList.addAll(list);
+            closedChatAdapter.notifyDataSetChanged();
+            updateTitleAndStateIfActive(list);
+        });
+
+        viewModel.getMessageList().observe(getViewLifecycleOwner(), list -> {
+            messageList.clear();
+            messageList.addAll(list);
+            messageAdapter.notifyDataSetChanged();
+            scrollToBottom();
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), this::setLoading);
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
+    private void updateTitleAndStateIfActive(List<Chat> list) {
+        if (activeConversationId != null) {
+            for (Chat chat : list) {
+                if (chat.getChatId().equals(String.valueOf(activeConversationId))) {
+                    binding.tvChatTitle.setText(chat.getCustomerName());
+                    setConversationActive(true, chat.getStatus());
+                    break;
+                }
+            }
+        }
     }
 
-    /**
-     * Loads authentication tokens and user info, then initializes the Stomp WebSocket connection.
-     */
     private void loadInitialData() {
         String token = tokenManager.getToken();
-        currentUserId = tokenManager.getUserId();
+        Long currentUserId = tokenManager.getUserId();
         String role = tokenManager.getRole();
 
         messageAdapter.setCurrentUserId(currentUserId);
         messageAdapter.setToken(token);
 
-        // if token exist then connect to websocket
         if (token != null) {
             stompChatManager = new StompChatManager(token, role, baseUrl);
             stompChatManager.setMessageListener(this);
             stompChatManager.setConversationListener(this);
             stompChatManager.setConnectionListener(this);
             stompChatManager.connect();
-        } else {
-            Log.e(TAG, "No token found");
         }
 
         if (getArguments() != null && getArguments().containsKey("conversation_id")) {
@@ -172,141 +329,60 @@ public class ChatFragment extends Fragment implements ChatAdapter.OnChatClickLis
         } else if (getActivity() != null && getActivity().getIntent().hasExtra("conversation_id")) {
             activeConversationId = getActivity().getIntent().getLongExtra("conversation_id", -1);
             getActivity().getIntent().removeExtra("conversation_id");
-            getActivity().getIntent().removeExtra("navigate_to");
+        } else {
+            activeConversationId = viewModel.getLastActiveConversationId();
         }
 
-        loadCustomers();
+        viewModel.loadCustomers();
+
+        if (activeConversationId != null) {
+            if (stompChatManager != null) stompChatManager.subscribeToConversation(activeConversationId);
+            viewModel.loadMessageHistory(activeConversationId);
+        } else {
+            setConversationActive(false, null);
+        }
     }
 
-    /**
-     * Fetches a list of customers from the ViewModel to display customer names for the chat list.
-     */
-    private void loadCustomers() {
-        viewModel.getAllCustomers(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                resource.data.getContent().forEach(c -> customerNames.put(c.getCustomerId(), c.getFullName()));
-                loadConversations();
-            }
-        });
-    }
-
-    /**
-     * Retrieves all conversations for the current user through the ViewModel and populates the chat drawer.
-     */
-    private void loadConversations() {
-        viewModel.getAllConversations().observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                chatList.clear();
-                for (ConversationDTO dto : resource.data) {
-                    String name = customerNames.getOrDefault(
-                            dto.getCustomerId(), "Customer #" + dto.getCustomerId());
-                    chatList.add(new Chat(String.valueOf(dto.getId()),
-                            name, dto.getLastMessage(),
-                            dto.getCustomerId(), dto.getStaffId()));
-                }
-                chatAdapter.notifyDataSetChanged();
-
-                if (activeConversationId != null) {
-                    setConversationActive(true);
-                    // Update title to customer name of active conversation
-                    for (Chat chat : chatList) {
-                        if (chat.getChatId().equals(String.valueOf(activeConversationId))) {
-                            binding.tvChatTitle.setText(chat.getCustomerName());
-                            break;
-                        }
-                    }
-                    if (stompChatManager != null) {
-                        stompChatManager.subscribeToConversation(activeConversationId);
-                    }
-                    loadMessageHistory(activeConversationId);
-                } else {
-                    messageList.clear();
-                    messageAdapter.notifyDataSetChanged();
-                    setConversationActive(false);
-                }
-            }
-        });
-    }
-
-    /**
-     * Handles selection of a chat from the drawer, updating the UI and subscribing to the WebSocket.
-     */
     @Override
     public void onChatClick(Chat chat) {
         activeConversationId = Long.parseLong(chat.getChatId());
-        setConversationActive(true);
+        viewModel.setLastActiveConversationId(activeConversationId);
+
+        setConversationActive(true, chat.getStatus());
         binding.tvChatTitle.setText(chat.getCustomerName());
         binding.chatDrawerLayout.closeDrawer(GravityCompat.START);
 
-        if (stompChatManager != null) {
-            stompChatManager.subscribeToConversation(activeConversationId);
-        }
-
-        loadMessageHistory(activeConversationId);
+        if (stompChatManager != null) stompChatManager.subscribeToConversation(activeConversationId);
+        viewModel.loadMessageHistory(activeConversationId);
     }
 
-    /**
-     * Fetches the full message history for a specific conversation from the ViewModel.
-     */
-    private void loadMessageHistory(Long conversationId) {
-        viewModel.getMessages(conversationId).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                messageList.clear();
-                for (MessageDTO dto : resource.data) {
-                    messageList.add(dtoToModel(dto));
-                }
-                messageAdapter.notifyDataSetChanged();
-                scrollToBottom();
-            }
-        });
-    }
-
-    /**
-     * Sends a plain text message to the currently active conversation through the ViewModel.
-     */
     private void sendMessage() {
-        //check if a chat is selected
         if (activeConversationId == null) return;
-
-        //get the message from text field
         String text = binding.etMessage.getText().toString().trim();
         if (text.isEmpty()) return;
 
-        //clear text field after sending
         binding.etMessage.setText("");
-
-        //calls viewmodel to send the message
-        viewModel.sendMessage(activeConversationId, new SendMessageRequest(text)).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                messageList.add(dtoToModel(resource.data));
-                messageAdapter.notifyItemInserted(messageList.size() - 1);
-                scrollToBottom();
-                loadConversations();
+        viewModel.sendMessage(activeConversationId, text).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.addMessageLocally(resource.data);
+                viewModel.loadConversations();
             }
         });
     }
 
-    /**
-     * Launches a file picker intent to select an attachment for the message.
-     */
     private void selectAttachment() {
         Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
         intent.setType("*/*");
         attachmentLauncher.launch(intent);
     }
 
-    /**
-     * Displays a preview of the selected attachment in the UI.
-     */
     private void showAttachmentPreview(Uri uri) {
         pendingAttachmentUri = uri;
         binding.layoutAttachmentPreview.setVisibility(View.VISIBLE);
-        
         String mimeType = requireContext().getContentResolver().getType(uri);
-        String fileName = getFileName(uri);
-        binding.tvPreviewName.setText(fileName);
-
-        // If the file is an image, display a thumbnail of the image as well
+        binding.tvPreviewName.setText(FileUtils.getFileName(requireContext(), uri));
         if (mimeType != null && mimeType.startsWith("image/")) {
             binding.ivPreview.setVisibility(View.VISIBLE);
             Glide.with(this).load(uri).into(binding.ivPreview);
@@ -315,183 +391,94 @@ public class ChatFragment extends Fragment implements ChatAdapter.OnChatClickLis
         }
     }
 
-    /**
-     * Clears the current attachment selection and hides the preview UI.
-     */
     private void removeAttachment() {
         pendingAttachmentUri = null;
         binding.layoutAttachmentPreview.setVisibility(View.GONE);
     }
 
-    /**
-     * Show the display name of the file from its Uri.
-     */
-    private String getFileName(Uri uri) {
-        String result = null;
-        if (uri.getScheme().equals("content")) {
-            try (Cursor cursor = requireContext().getContentResolver().query(uri, null, null, null, null)) {
-                if (cursor != null && cursor.moveToFirst()) {
-                    int index = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
-                    if (index != -1) {
-                        result = cursor.getString(index);
-                    }
-                }
-            }
-        }
-        if (result == null) {
-            result = uri.getPath();
-            int cut = result.lastIndexOf('/');
-            if (cut != -1) {
-                result = result.substring(cut + 1);
-            }
-        }
-        return result;
-    }
-
-    /**
-     * Handles sending a message that includes a file attachment via the ViewModel.
-     */
     private void sendWithAttachment(Uri uri) {
         if (activeConversationId == null) return;
+
+        File file = FileUtils.getFileFromUri(requireContext(), uri);
+        if (file == null) {
+            Toast.makeText(requireContext(), "Failed to prepare file", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
         String text = binding.etMessage.getText().toString().trim();
+
+        MultipartBody.Part contentPart = text.isEmpty()
+                ? null
+                : MultipartBody.Part.createFormData("content", text);
+
+        String mimeType = requireContext().getContentResolver().getType(uri);
+        if (mimeType == null) mimeType = "application/octet-stream";
+
+        RequestBody filePartBody = RequestBody.create(file, MediaType.parse(mimeType));
+        MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), filePartBody);
+
         binding.etMessage.setText("");
         removeAttachment();
 
-        if (!text.isEmpty()) {
-            binding.etMessage.setText(text);
-        }
-        Toast.makeText(requireContext(), "File attachments are not supported", Toast.LENGTH_SHORT).show();
-    }
-
-    /**
-     * Callback triggered when a new message is received via the WebSocket.
-     */
-    @Override
-    public void onMessageReceived(MessageDTO dto) {
-        //if there is no active selected conversation or the message received is for another chat, then just update the preview of last message
-        if (activeConversationId == null || !activeConversationId.equals(dto.getConversationId())) {
-            updateConversationPreview(dto.getConversationId(), dto.getContent());
-            return;
-        }
-        updateConversationPreview(dto.getConversationId(), dto.getContent());
-
-        if (currentUserId != null && currentUserId.equals(dto.getSenderId())) return;
-
-        //else add the message to the active chat if it's not from the current user
-        messageList.add(dtoToModel(dto));
-        requireActivity().runOnUiThread(() -> {
-            messageAdapter.notifyItemInserted(messageList.size() - 1);
-            scrollToBottom();
+        viewModel.sendMessageWithAttachment(activeConversationId, contentPart, filePart).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.addMessageLocally(resource.data);
+                viewModel.loadConversations();
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(requireContext(), "Failed to send attachment: " + resource.message, Toast.LENGTH_SHORT).show();
+            }
+        });
+    }
+
+    @Override
+    public void onMessageReceived(MessageDTO dto) {
+        requireActivity().runOnUiThread(() -> {
+            if (activeConversationId != null && activeConversationId.equals(dto.getConversationId())) {
+                if (!tokenManager.getUserId().equals(dto.getSenderId())) {
+                    viewModel.addMessageLocally(dto);
+                }
+            }
+            viewModel.updateConversationLocally(new ConversationDTO(dto.getConversationId(), 0L, 0L, dto.getContent(), ""));
         });
     }
 
-    /**
-     * Callback triggered when a conversation is created or updated via the WebSocket.
-     */
     @Override
     public void onConversationUpdated(ConversationDTO dto) {
         requireActivity().runOnUiThread(() -> {
-            boolean updated = false;
-            String name = customerNames.getOrDefault(
-                    dto.getCustomerId(), "Customer #" + dto.getCustomerId());
-
-            for (int i = 0; i < chatList.size(); i++) {
-                Chat existing = chatList.get(i);
-                if (existing.getChatId().equals(String.valueOf(dto.getId()))) {
-                    chatList.set(i, new Chat(
-                            String.valueOf(dto.getId()),
-                            name,
-                            dto.getLastMessage(),
-                            dto.getCustomerId(),
-                            dto.getStaffId()
-                    ));
-                    chatAdapter.notifyItemChanged(i);
-                    updated = true;
-                    break;
-                }
-            }
-
-            if (!updated) {
-                chatList.add(0, new Chat(
-                        String.valueOf(dto.getId()),
-                        name,
-                        dto.getLastMessage(),
-                        dto.getCustomerId(),
-                        dto.getStaffId()
-                ));
-                chatAdapter.notifyItemInserted(0);
-            }
-
+            viewModel.updateConversationLocally(dto);
             if (activeConversationId != null && activeConversationId.equals(dto.getId())) {
-                setConversationActive(true);
-                binding.tvChatTitle.setText(name);
+                setConversationActive(true, dto.getStatus());
+                binding.tvChatTitle.setText(viewModel.getCustomerName(dto.getCustomerId()));
             }
         });
     }
 
-    /**
-     * Callback triggered when the WebSocket connection is successfully opened.
-     */
     @Override
     public void onSocketOpened() {
-        if (!isAdded()) {
-            return;
-        }
+        if (!isAdded()) return;
         requireActivity().runOnUiThread(() -> {
-            loadConversations();
-            if (activeConversationId != null) {
-                loadMessageHistory(activeConversationId);
-            }
+            viewModel.loadConversations();
+            if (activeConversationId != null) viewModel.loadMessageHistory(activeConversationId);
         });
     }
 
-    /**
-     * Callback triggered when the WebSocket connection is closed.
-     */
     @Override
     public void onSocketClosed() {
-        if (!isAdded()) {
-            return;
-        }
-        requireActivity().runOnUiThread(this::loadConversations);
+        if (!isAdded()) return;
+        requireActivity().runOnUiThread(viewModel::loadConversations);
     }
 
-    /**
-     * Callback triggered when a WebSocket connection error occurs.
-     */
     @Override
     public void onSocketError() {
-        if (!isAdded()) {
-            return;
-        }
+        if (!isAdded()) return;
         requireActivity().runOnUiThread(() -> {
-            loadConversations();
-            if (activeConversationId != null) {
-                loadMessageHistory(activeConversationId);
-            }
+            viewModel.loadConversations();
+            if (activeConversationId != null) viewModel.loadMessageHistory(activeConversationId);
         });
     }
 
-    /**
-     * Converts a MessageDTO into a Message object.
-     */
-    private Message dtoToModel(MessageDTO dto) {
-        Message m = new Message();
-        m.setId(dto.getId());
-        m.setConversationId(dto.getConversationId());
-        m.setSenderId(dto.getSenderId());
-        m.setContent(dto.getContent());
-        m.setTimestamp(dto.getTimestamp());
-        m.setIsRead(dto.getIsRead());
-        m.setAttachmentUrl(dto.getAttachmentUrl());
-        m.setAttachmentName(dto.getAttachmentName());
-        m.setAttachmentType(dto.getAttachmentType());
-        return m;
-    }
-
-    /**
-     * Scrolls the message history RecyclerView to the most recent message.
-     */
     private void scrollToBottom() {
         if (!messageList.isEmpty()) {
             binding.rvMessages.post(() ->
@@ -499,60 +486,26 @@ public class ChatFragment extends Fragment implements ChatAdapter.OnChatClickLis
         }
     }
 
-    /**
-     * Updates the preview snippet of the last message for a specific conversation in the drawer.
-     */
-    private void updateConversationPreview(Long conversationId, String lastMessage) {
-        if (conversationId == null) {
-            return;
-        }
-        requireActivity().runOnUiThread(() -> {
-            for (int i = 0; i < chatList.size(); i++) {
-                Chat existing = chatList.get(i);
-                if (existing.getChatId().equals(String.valueOf(conversationId))) {
-                    Chat updated = new Chat(
-                            existing.getChatId(),
-                            existing.getCustomerName(),
-                            lastMessage,
-                            existing.getCustomerId(),
-                            existing.getStaffId()
-                    );
-                    chatList.set(i, updated);
-                    chatAdapter.notifyItemChanged(i);
-                    return;
-                }
-            }
-        });
-    }
-
-    /**
-     * Toggles the UI state based on whether a conversation is currently selected.
-     */
-    private void setConversationActive(boolean active) {
-        binding.btnSend.setEnabled(active);
-        binding.etMessage.setEnabled(active);
-        binding.btnAttach.setEnabled(active);
+    private void setConversationActive(boolean active, String status) {
+        boolean isClosed = "CLOSED".equalsIgnoreCase(status);
+        UIUtils.setViewsEnabled(active && !isClosed, binding.btnSend, binding.etMessage, binding.btnAttach);
+        
         if (!active) {
             activeConversationId = null;
             ChatNotificationService.activeConversationIdInUi = null;
             removeAttachment();
             if (binding != null && binding.tvChatTitle != null) binding.tvChatTitle.setText("Customer Chat");
-            if (stompChatManager != null) {
-                stompChatManager.clearConversationSubscription();
-            }
+            if (stompChatManager != null) stompChatManager.clearConversationSubscription();
             messageList.clear();
             messageAdapter.notifyDataSetChanged();
             binding.etMessage.setText("");
             binding.etMessage.setHint("Select a chat to start messaging");
         } else {
-            binding.etMessage.setHint("Type a message...");
+            binding.etMessage.setHint(isClosed ? "This chat is closed" : "Type a message...");
             ChatNotificationService.activeConversationIdInUi = activeConversationId;
         }
     }
 
-    /**
-     * Disconnects the WebSocket manager when the fragment view is destroyed.
-     */
     @Override
     public void onDestroyView() {
         super.onDestroyView();

android/app/src/main/java/com/example/petstoremobile/fragments/ProfileFragment.java

@@ -172,6 +172,12 @@ public class ProfileFragment extends Fragment {
         return binding.getRoot();
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
@@ -184,6 +190,7 @@ public class ProfileFragment extends Fragment {
     private void loadProfileData() {
         viewModel.getMe().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 currentUser = resource.data;
 
@@ -229,6 +236,7 @@ public class ProfileFragment extends Fragment {
             //Call the backend to upload the avatar
             viewModel.uploadAvatar(body).observe(getViewLifecycleOwner(), resource -> {
                 if (resource == null) return;
+                setLoading(resource.status == Resource.Status.LOADING);
                 if (resource.status == Resource.Status.SUCCESS) {
                     Toast.makeText(getContext(), "Avatar updated successfully", Toast.LENGTH_SHORT).show();
                     loadProfileData();
@@ -247,6 +255,7 @@ public class ProfileFragment extends Fragment {
     private void deleteAvatar() {
         viewModel.deleteAvatar().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS) {
                 hasImage = false;
                 binding.imgProfile.setImageResource(R.drawable.placeholder);
@@ -266,6 +275,7 @@ public class ProfileFragment extends Fragment {
 
         viewModel.updateMe(updates).observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 currentUser = resource.data;
                 Toast.makeText(getContext(), "Profile updated successfully", Toast.LENGTH_SHORT).show();

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/AdoptionFragment.java

@@ -24,9 +24,8 @@ import com.example.petstoremobile.utils.BulkDeleteHandler;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.AdoptionViewModel;
+import com.example.petstoremobile.viewmodels.AdoptionListViewModel;
 import com.example.petstoremobile.utils.EventDecorator;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
 import com.prolificinteractive.materialcalendarview.CalendarDay;
 import com.prolificinteractive.materialcalendarview.CalendarMode;
 
@@ -46,28 +45,19 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
 
     private FragmentAdoptionBinding binding;
     private List<AdoptionDTO> adoptionList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
     private AdoptionAdapter adapter;
-    private AdoptionViewModel adoptionViewModel;
-    private StoreViewModel storeViewModel;
+    private AdoptionListViewModel viewModel;
     private BulkDeleteHandler bulkDeleteHandler;
     private CalendarDay selectedCalendarDay;
     private boolean isMonthMode = false;
     private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
 
-    /**
-     * Initializes the fragment and its ViewModels.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        adoptionViewModel = new ViewModelProvider(this).get(AdoptionViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(AdoptionListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including RecyclerView, Search, SwipeRefresh, and Calendar.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -81,6 +71,7 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
         setupCalendar();
         setupFilterToggle();
         setupBulkDelete();
+        observeViewModel();
 
         binding.fabAddAdoption.setOnClickListener(v -> openDetail(-1));
 
@@ -91,6 +82,24 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getAdoptions().observe(getViewLifecycleOwner(), list -> {
+            adoptionList.clear();
+            adoptionList.addAll(list);
+            updateCalendarDecorators();
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getStores().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStoreAdoption, list,
+                    StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshAdoption.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -99,27 +108,18 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
                 binding.btnBulkDelete,
                 adapter,
                 "adoption",
-                adoptionViewModel::bulkDeleteAdoptions,
+                viewModel::bulkDeleteAdoptions,
                 this::loadAdoptions
         );
     }
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        binding = null;
-    }
-
     @Override
     public void onResume() {
         super.onResume();
         loadAdoptions();
-        loadStoreData();
+        viewModel.loadStores();
     }
 
-    /**
-     * Toggles the calendar display between week and month modes.
-     */
     private void toggleCalendarMode() {
         isMonthMode = !isMonthMode;
         binding.calendarViewAdoption.state().edit()
@@ -127,35 +127,11 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
                 .commit();
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilterAdoption, binding.layoutFilterAdoption, 
                 binding.etSearchAdoption, binding.spinnerStatusAdoption, binding.spinnerStoreAdoption);
-
-        binding.btnToggleFilterAdoption.setOnClickListener(v -> {
-            boolean isVisible = binding.layoutFilterAdoption.getVisibility() == View.VISIBLE;
-            binding.layoutFilterAdoption.setVisibility(isVisible ? View.GONE : View.VISIBLE);
-            
-            binding.btnToggleFilterAdoption.setImageResource(isVisible ? 
-                    android.R.drawable.ic_menu_search : 
-                    android.R.drawable.ic_menu_close_clear_cancel);
-
-            if (isVisible) {
-                binding.etSearchAdoption.setText("");
-                binding.spinnerStatusAdoption.setSelection(0);
-                binding.spinnerStoreAdoption.setSelection(0);
-                selectedCalendarDay = null;
-                binding.calendarViewAdoption.clearSelection();
-                loadAdoptions();
-            }
-        });
     }
 
-    /**
-     * Sets up the date selection listener for the calendar.
-     */
     private void setupCalendar() {
         binding.calendarViewAdoption.setOnDateChangedListener((widget, date, selected) -> {
             if (selected) {
@@ -172,9 +148,6 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
         });
     }
 
-    /**
-     * Updates the calendar decorators to highlight days with adoptions.
-     */
     private void updateCalendarDecorators() {
         HashSet<CalendarDay> datesWithAdoptions = new HashSet<>();
         for (AdoptionDTO adoption : adoptionList) {
@@ -195,67 +168,37 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
         binding.calendarViewAdoption.addDecorator(new EventDecorator(Color.RED, datesWithAdoptions));
     }
 
-    /**
-     * Initializes the RecyclerView for displaying adoptions.
-     */
     private void setupRecyclerView() {
         adapter = new AdoptionAdapter(adoptionList, this);
         binding.recyclerViewAdoptions.setLayoutManager(new LinearLayoutManager(getContext()));
         binding.recyclerViewAdoptions.setAdapter(adapter);
     }
 
-    /**
-     * Sets up the search bar for filtering
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchAdoption, this::loadAdoptions);
     }
 
-    /**
-     * Configures the status filter spinner.
-     */
     private void setupStatusFilter() {
         String[] statuses = {"All Statuses", "Completed", "Pending", "Cancelled"};
         SpinnerUtils.setupStringFilterSpinner(requireContext(), binding.spinnerStatusAdoption, statuses, this::loadAdoptions);
     }
 
-    /**
-     * Configures the store filter spinner.
-     */
     private void setupStoreFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerStoreAdoption, this::loadAdoptions);
     }
 
-    /**
-     * Fetches store data to populate the store filter.
-     */
-    private void loadStoreData() {
-        storeViewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStoreAdoption, storeList,
-                        StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
-            }
-        });
-    }
-
-    /**
-     * Sets up the SwipeRefreshLayout to reload adoption data.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshAdoption.setOnRefreshListener(this::loadAdoptions);
     }
 
-    /**
-     * Fetches the adoption list from the server through the ViewModel.
-     */
     private void loadAdoptions() {
         String query = binding.etSearchAdoption.getText().toString().trim();
         String status = binding.spinnerStatusAdoption.getSelectedItem() != null ? binding.spinnerStatusAdoption.getSelectedItem().toString() : "All Statuses";
 
         Long storeId = null;
-        if (binding.spinnerStoreAdoption.getSelectedItemPosition() > 0 && !storeList.isEmpty()) {
-            storeId = storeList.get(binding.spinnerStoreAdoption.getSelectedItemPosition() - 1).getStoreId();
+        List<StoreDTO> stores = viewModel.getStores().getValue();
+        if (binding.spinnerStoreAdoption.getSelectedItemPosition() > 0 && stores != null && !stores.isEmpty()) {
+            storeId = stores.get(binding.spinnerStoreAdoption.getSelectedItemPosition() - 1).getStoreId();
         }
 
         String selectedDateString = null;
@@ -267,52 +210,18 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
         if (status.equals("All Statuses")) status = null;
         else status = status.toUpperCase();
 
-        adoptionViewModel.getAllAdoptions(0, 500, query, status, storeId, selectedDateString, null).observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            // Check the status to see if the resource is loaded and display the data
-            switch (resource.status) {
-                case LOADING:
-                    // Show loading indicator
-                    binding.swipeRefreshAdoption.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    // Hide loading indicator and display data
-                    binding.swipeRefreshAdoption.setRefreshing(false);
-                    if (resource.data != null) {
-                        adoptionList.clear();
-                        adoptionList.addAll(resource.data.getContent());
-                        updateCalendarDecorators();
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    // Hide loading indicator and toast error message
-                    binding.swipeRefreshAdoption.setRefreshing(false);
-                    Toast.makeText(getContext(), "Failed to load adoptions: " + resource.message, Toast.LENGTH_SHORT).show();
-                    Log.e("AdoptionFragment", "Error loading adoptions: " + resource.message);
-                    break;
-            }
-        });
+        viewModel.loadAdoptions(true, query, status, storeId, selectedDateString, null);
     }
 
-    /**
-     * Navigates to the adoption detail screen for a specific adoption or to create a new one.
-     */
     private void openDetail(int position) {
         Bundle args = new Bundle();
-
         if (position != -1) {
             AdoptionDTO a = adoptionList.get(position);
             args.putLong("adoptionId", a.getAdoptionId());
         }
-
         NavHostFragment.findNavController(this).navigate(R.id.nav_adoption_detail, args);
     }
 
-    /**
-     * Handles item click in the adoption list.
-     */
     @Override
     public void onAdoptionClick(int position) { openDetail(position); }
 
@@ -322,4 +231,10 @@ public class AdoptionFragment extends Fragment implements AdoptionAdapter.OnAdop
             bulkDeleteHandler.onSelectionChanged(selectedCount);
         }
     }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/AnalyticsFragment.java

@@ -2,16 +2,14 @@ package com.example.petstoremobile.fragments.listfragments;
 
 import android.graphics.Color;
 import android.os.Bundle;
-import android.util.Log;
 import android.view.*;
 import android.widget.*;
 import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import com.example.petstoremobile.databinding.FragmentAnalyticsBinding;
-import com.example.petstoremobile.dtos.SaleDTO;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.SaleViewModel;
+import com.example.petstoremobile.viewmodels.AnalyticsViewModel;
 import dagger.hilt.android.AndroidEntryPoint;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
@@ -21,228 +19,130 @@ import java.util.*;
 public class AnalyticsFragment extends Fragment {
 
     private FragmentAnalyticsBinding binding;
-    private SaleViewModel saleViewModel;
+    private AnalyticsViewModel viewModel;
 
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         binding = FragmentAnalyticsBinding.inflate(inflater, container, false);
-        saleViewModel = new ViewModelProvider(this).get(SaleViewModel.class);
+        viewModel = new ViewModelProvider(this).get(AnalyticsViewModel.class);
 
-        loadAnalytics();
+        observeViewModel();
+        viewModel.loadAnalytics();
 
-        binding.btnRefreshAnalytics.setOnClickListener(v -> loadAnalytics());
+        binding.btnRefreshAnalytics.setOnClickListener(v -> viewModel.loadAnalytics());
         
         UIUtils.setupHamburgerMenu(binding.btnHamburgerAnalytics, this);
 
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getAnalyticsData().observe(getViewLifecycleOwner(), this::computeAndDisplay);
+        
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+            if (loading) {
+                binding.tvTotalRevenue.setText("Loading...");
+                binding.tvTotalTransactions.setText("...");
+                binding.tvAvgTransaction.setText("...");
+                binding.tvTotalItems.setText("...");
+            }
+        });
+
+        viewModel.getErrorMessage().observe(getViewLifecycleOwner(), error -> {
+            if (error != null) showError(error);
+        });
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    private void loadAnalytics() {
-        // Clear all sections
+    private void computeAndDisplay(AnalyticsViewModel.AnalyticsData data) {
+        if (data == null) return;
+
+        // Summary
+        binding.tvTotalRevenue.setText("$" + data.totalRevenue.setScale(2, RoundingMode.HALF_UP));
+        binding.tvTotalTransactions.setText(String.valueOf(data.totalTransactions));
+        binding.tvAvgTransaction.setText("$" + data.avgTransaction);
+        binding.tvTotalItems.setText(String.valueOf(data.totalItems));
+
+        // Top Revenue Products
         binding.llTopRevenue.removeAllViews();
-        binding.llTopQuantity.removeAllViews();
-        binding.llPaymentMethods.removeAllViews();
-        binding.llEmployeePerformance.removeAllViews();
-        binding.llDailyRevenue.removeAllViews();
-
-        // Show loading
-        binding.tvTotalRevenue.setText("Loading...");
-        binding.tvTotalTransactions.setText("...");
-        binding.tvAvgTransaction.setText("...");
-        binding.tvTotalItems.setText("...");
-
-        saleViewModel.getAllSales(0, 1000, null, null, null, "saleDate,desc")
-                .observe(getViewLifecycleOwner(), resource -> {
-                    if (resource != null) {
-                        switch (resource.status) {
-                            case SUCCESS:
-                                if (resource.data != null) {
-                                    computeAndDisplay(resource.data.getContent());
-                                }
-                                break;
-                            case ERROR:
-                                Log.e("Analytics", resource.message != null ? resource.message : "Error loading sales");
-                                showError("Failed to load sales data");
-                                break;
-                            case LOADING:
-                                // Already showing loading state in UI
-                                break;
-                        }
-                    }
-                });
-    }
-
-    private void computeAndDisplay(List<SaleDTO> sales) {
-        // Filter out refunds for most metrics
-        List<SaleDTO> regularSales = new ArrayList<>();
-        for (SaleDTO s : sales) {
-            if (!Boolean.TRUE.equals(s.getIsRefund()))
-                regularSales.add(s);
-        }
-
-        // ── Summary ──────────────────────────────────────────
-        BigDecimal totalRevenue = BigDecimal.ZERO;
-        int totalItems = 0;
-
-        for (SaleDTO s : regularSales) {
-            if (s.getTotalAmount() != null)
-                totalRevenue = totalRevenue.add(s.getTotalAmount());
-            if (s.getItems() != null) {
-                for (SaleDTO.SaleItemDTO item : s.getItems()) {
-                    if (item.getQuantity() != null)
-                        totalItems += Math.abs(item.getQuantity());
-                }
+        if (data.topRevenueProducts != null && !data.topRevenueProducts.isEmpty()) {
+            BigDecimal maxRevenue = data.topRevenueProducts.get(0).getValue();
+            if (maxRevenue.compareTo(BigDecimal.ZERO) == 0) maxRevenue = BigDecimal.ONE;
+            for (Map.Entry<String, BigDecimal> e : data.topRevenueProducts) {
+                addBarRow(binding.llTopRevenue, e.getKey(), "$" + e.getValue().setScale(2, RoundingMode.HALF_UP),
+                        e.getValue().floatValue() / maxRevenue.floatValue(), "#ff6b35");
             }
-        }
-
-        int totalTx = regularSales.size();
-        BigDecimal avgTx = totalTx > 0
-                ? totalRevenue.divide(BigDecimal.valueOf(totalTx), 2, RoundingMode.HALF_UP)
-                : BigDecimal.ZERO;
-
-        binding.tvTotalRevenue.setText("$" + totalRevenue.setScale(2, RoundingMode.HALF_UP));
-        binding.tvTotalTransactions.setText(String.valueOf(totalTx));
-        binding.tvAvgTransaction.setText("$" + avgTx);
-        binding.tvTotalItems.setText(String.valueOf(totalItems));
-
-        // ── Top Products by Revenue ───────────────────────────
-        Map<String, BigDecimal> revenueByProduct = new LinkedHashMap<>();
-        Map<String, Integer> quantityByProduct = new LinkedHashMap<>();
-
-        for (SaleDTO s : regularSales) {
-            if (s.getItems() != null) {
-                for (SaleDTO.SaleItemDTO item : s.getItems()) {
-                    String name = item.getProductName() != null ? item.getProductName() : "Unknown";
-                    int qty = item.getQuantity() != null ? Math.abs(item.getQuantity()) : 0;
-                    BigDecimal lineTotal = item.getUnitPrice() != null
-                            ? item.getUnitPrice().multiply(BigDecimal.valueOf(qty))
-                            : BigDecimal.ZERO;
-
-                    revenueByProduct.merge(name, lineTotal, BigDecimal::add);
-                    quantityByProduct.merge(name, qty, Integer::sum);
-                }
-            }
-        }
-
-        // Sort by revenue desc, take top 5
-        List<Map.Entry<String, BigDecimal>> topRevenue = new ArrayList<>(revenueByProduct.entrySet());
-        topRevenue.sort((a, b) -> b.getValue().compareTo(a.getValue()));
-        BigDecimal maxRevenue = topRevenue.isEmpty() ? BigDecimal.ONE : topRevenue.get(0).getValue();
-
-        binding.llTopRevenue.removeAllViews();
-        for (int i = 0; i < Math.min(5, topRevenue.size()); i++) {
-            Map.Entry<String, BigDecimal> e = topRevenue.get(i);
-            addBarRow(binding.llTopRevenue, e.getKey(), "$" + e.getValue().setScale(2, RoundingMode.HALF_UP),
-                    e.getValue().floatValue() / maxRevenue.floatValue(), "#ff6b35");
-        }
-        if (topRevenue.isEmpty())
+        } else {
             addEmptyRow(binding.llTopRevenue, "No data");
+        }
 
-        // Sort by quantity desc, take top 5
-        List<Map.Entry<String, Integer>> topQuantity = new ArrayList<>(quantityByProduct.entrySet());
-        topQuantity.sort((a, b) -> b.getValue() - a.getValue());
-        int maxQty = topQuantity.isEmpty() ? 1 : topQuantity.get(0).getValue();
-
+        // Top Quantity Products
         binding.llTopQuantity.removeAllViews();
-        for (int i = 0; i < Math.min(5, topQuantity.size()); i++) {
-            Map.Entry<String, Integer> e = topQuantity.get(i);
-            addBarRow(binding.llTopQuantity, e.getKey(), e.getValue() + " units",
-                    (float) e.getValue() / maxQty, "#4ecdc4");
-        }
-        if (topQuantity.isEmpty())
-            addEmptyRow(binding.llTopQuantity, "No data");
-
-        // ── Payment Methods ───────────────────────────────────
-        Map<String, Integer> paymentCount = new LinkedHashMap<>();
-        for (SaleDTO s : regularSales) {
-            String method = s.getPaymentMethod() != null ? s.getPaymentMethod() : "Unknown";
-            paymentCount.merge(method, 1, Integer::sum);
-        }
-
-        int maxPayment = paymentCount.values().stream().max(Integer::compare).orElse(1);
-        String[] paymentColors = { "#1a759f", "#ff9f1c", "#577590", "#90be6d" };
-        int ci = 0;
-        binding.llPaymentMethods.removeAllViews();
-        for (Map.Entry<String, Integer> e : paymentCount.entrySet()) {
-            addBarRow(binding.llPaymentMethods, e.getKey(),
-                    e.getValue() + " transactions",
-                    (float) e.getValue() / maxPayment,
-                    paymentColors[ci % paymentColors.length]);
-            ci++;
-        }
-        if (paymentCount.isEmpty())
-            addEmptyRow(binding.llPaymentMethods, "No data");
-
-        // ── Employee Performance ──────────────────────────────
-        Map<String, BigDecimal> employeeRevenue = new LinkedHashMap<>();
-        for (SaleDTO s : regularSales) {
-            String emp = s.getEmployeeName() != null ? s.getEmployeeName() : "Unknown";
-            if (s.getTotalAmount() != null)
-                employeeRevenue.merge(emp, s.getTotalAmount(), BigDecimal::add);
-        }
-
-        List<Map.Entry<String, BigDecimal>> empList = new ArrayList<>(employeeRevenue.entrySet());
-        empList.sort((a, b) -> b.getValue().compareTo(a.getValue()));
-        BigDecimal maxEmp = empList.isEmpty() ? BigDecimal.ONE : empList.get(0).getValue();
-
-        binding.llEmployeePerformance.removeAllViews();
-        for (Map.Entry<String, BigDecimal> e : empList) {
-            addBarRow(binding.llEmployeePerformance, e.getKey(),
-                    "$" + e.getValue().setScale(2, RoundingMode.HALF_UP),
-                    e.getValue().floatValue() / maxEmp.floatValue(),
-                    "#1a759f");
-        }
-        if (empList.isEmpty())
-            addEmptyRow(binding.llEmployeePerformance, "No data");
-
-        // ── Daily Revenue (last 7 days) ───────────────────────
-        Map<String, BigDecimal> dailyRevenue = new TreeMap<>();
-
-        // Initialize last 7 days
-        Calendar cal = Calendar.getInstance();
-        for (int i = 6; i >= 0; i--) {
-            Calendar day = Calendar.getInstance();
-            day.add(Calendar.DAY_OF_YEAR, -i);
-            String key = String.format("%04d-%02d-%02d",
-                    day.get(Calendar.YEAR),
-                    day.get(Calendar.MONTH) + 1,
-                    day.get(Calendar.DAY_OF_MONTH));
-            dailyRevenue.put(key, BigDecimal.ZERO);
-        }
-
-        for (SaleDTO s : regularSales) {
-            if (s.getSaleDate() != null && s.getTotalAmount() != null) {
-                String date = s.getSaleDate().length() >= 10
-                        ? s.getSaleDate().substring(0, 10)
-                        : s.getSaleDate();
-                if (dailyRevenue.containsKey(date)) {
-                    dailyRevenue.merge(date, s.getTotalAmount(), BigDecimal::add);
-                }
+        if (data.topQuantityProducts != null && !data.topQuantityProducts.isEmpty()) {
+            int maxQty = data.topQuantityProducts.get(0).getValue();
+            if (maxQty == 0) maxQty = 1;
+            for (Map.Entry<String, Integer> e : data.topQuantityProducts) {
+                addBarRow(binding.llTopQuantity, e.getKey(), e.getValue() + " units",
+                        (float) e.getValue() / maxQty, "#4ecdc4");
             }
+        } else {
+            addEmptyRow(binding.llTopQuantity, "No data");
         }
 
-        BigDecimal maxDaily = dailyRevenue.values().stream()
-                .max(BigDecimal::compareTo).orElse(BigDecimal.ONE);
-        if (maxDaily.compareTo(BigDecimal.ZERO) == 0)
-            maxDaily = BigDecimal.ONE;
+        // Payment Methods
+        binding.llPaymentMethods.removeAllViews();
+        if (data.paymentMethodStats != null && !data.paymentMethodStats.isEmpty()) {
+            int maxPayment = data.paymentMethodStats.stream().mapToInt(Map.Entry::getValue).max().orElse(1);
+            String[] paymentColors = { "#1a759f", "#ff9f1c", "#577590", "#90be6d" };
+            int ci = 0;
+            for (Map.Entry<String, Integer> e : data.paymentMethodStats) {
+                addBarRow(binding.llPaymentMethods, e.getKey(),
+                        e.getValue() + " transactions",
+                        (float) e.getValue() / maxPayment,
+                        paymentColors[ci % paymentColors.length]);
+                ci++;
+            }
+        } else {
+            addEmptyRow(binding.llPaymentMethods, "No data");
+        }
 
+        // Employee Performance
+        binding.llEmployeePerformance.removeAllViews();
+        if (data.employeePerformance != null && !data.employeePerformance.isEmpty()) {
+            BigDecimal maxEmp = data.employeePerformance.get(data.employeePerformance.size() - 1).getValue();
+            if (maxEmp.compareTo(BigDecimal.ZERO) == 0) maxEmp = BigDecimal.ONE;
+            maxEmp = data.employeePerformance.get(0).getValue();
+            if (maxEmp.compareTo(BigDecimal.ZERO) == 0) maxEmp = BigDecimal.ONE;
+
+            for (Map.Entry<String, BigDecimal> e : data.employeePerformance) {
+                addBarRow(binding.llEmployeePerformance, e.getKey(),
+                        "$" + e.getValue().setScale(2, RoundingMode.HALF_UP),
+                        e.getValue().floatValue() / maxEmp.floatValue(),
+                        "#1a759f");
+            }
+        } else {
+            addEmptyRow(binding.llEmployeePerformance, "No data");
+        }
+
+        // Daily Revenue
         binding.llDailyRevenue.removeAllViews();
-        for (Map.Entry<String, BigDecimal> e : dailyRevenue.entrySet()) {
-            // Show just MM-DD
-            String label = e.getKey().length() >= 10
-                    ? e.getKey().substring(5)
-                    : e.getKey();
-            addBarRow(binding.llDailyRevenue, label,
-                    "$" + e.getValue().setScale(2, RoundingMode.HALF_UP),
-                    e.getValue().floatValue() / maxDaily.floatValue(),
-                    "#ff6b35");
+        if (data.dailyRevenue != null && !data.dailyRevenue.isEmpty()) {
+            BigDecimal maxDaily = data.dailyRevenue.stream().map(Map.Entry::getValue).max(BigDecimal::compareTo).orElse(BigDecimal.ONE);
+            if (maxDaily.compareTo(BigDecimal.ZERO) == 0) maxDaily = BigDecimal.ONE;
+            for (Map.Entry<String, BigDecimal> e : data.dailyRevenue) {
+                String label = e.getKey().length() >= 10 ? e.getKey().substring(5) : e.getKey();
+                addBarRow(binding.llDailyRevenue, label,
+                        "$" + e.getValue().setScale(2, RoundingMode.HALF_UP),
+                        e.getValue().floatValue() / maxDaily.floatValue(),
+                        "#ff6b35");
+            }
         }
     }
 

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/AppointmentFragment.java

@@ -14,7 +14,6 @@ import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.adapters.AppointmentAdapter;
@@ -25,10 +24,9 @@ import com.example.petstoremobile.utils.BulkDeleteHandler;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.AppointmentViewModel;
+import com.example.petstoremobile.viewmodels.AppointmentListViewModel;
 import com.example.petstoremobile.utils.EventDecorator;
 import com.example.petstoremobile.viewmodels.AuthViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
 import com.prolificinteractive.materialcalendarview.CalendarDay;
 import com.prolificinteractive.materialcalendarview.CalendarMode;
 
@@ -48,11 +46,9 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
 
     private FragmentAppointmentBinding binding;
     private List<AppointmentDTO> appointmentList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
 
     private AppointmentAdapter adapter;
-    private AppointmentViewModel appointmentViewModel;
-    private StoreViewModel storeViewModel;
+    private AppointmentListViewModel viewModel;
     private AuthViewModel authViewModel;
     private BulkDeleteHandler bulkDeleteHandler;
 
@@ -61,20 +57,13 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
     private Long currentUserId = null;
     private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
 
-    /**
-     * Initializes the fragment and its associated ViewModels.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        appointmentViewModel = new ViewModelProvider(this).get(AppointmentViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(AppointmentListViewModel.class);
         authViewModel = new ViewModelProvider(this).get(AuthViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI, including RecyclerView, search, swipe-to-refresh, and calendar.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -89,6 +78,7 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         setupFilterToggle();
         setupMyAppointmentFilter();
         setupBulkDelete();
+        observeViewModel();
 
         binding.fabAddAppointment.setOnClickListener(v -> openAppointmentDetails(-1));
 
@@ -101,6 +91,24 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getAppointments().observe(getViewLifecycleOwner(), list -> {
+            appointmentList.clear();
+            appointmentList.addAll(list);
+            updateCalendarDecorators();
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getStores().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, list,
+                    StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshAppointment.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -109,27 +117,18 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
                 binding.btnBulkDelete,
                 adapter,
                 "appointment",
-                appointmentViewModel::bulkDeleteAppointments,
+                viewModel::bulkDeleteAppointments,
                 this::loadAppointmentData
         );
     }
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        binding = null;
-    }
-
     @Override
     public void onResume() {
         super.onResume();
         loadAppointmentData();
-        loadStoreData();
+        viewModel.loadStores();
     }
 
-    /**
-     * Toggles the calendar between week and month display modes.
-     */
     private void toggleCalendarMode() {
         isMonthMode = !isMonthMode;
         binding.calendarView.state().edit()
@@ -137,18 +136,12 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
                 .commit();
     }
 
-    /**
-     * Sets up the "My Appointments" filter button.
-     */
     private void setupMyAppointmentFilter() {
         binding.btnMyAppointments.setOnClickListener(v -> {
             loadAppointmentData();
         });
     }
 
-    /**
-     * Fetches current user info to get the employeeId.
-     */
     private void loadCurrentUserInfo() {
         authViewModel.getMe().observe(getViewLifecycleOwner(), resource -> {
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
@@ -157,37 +150,11 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         });
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchAppointment,
                 binding.spinnerStatus, binding.spinnerStore);
-        
-        // Add additional reset logic for elements specific to this fragment
-        binding.btnToggleFilter.setOnClickListener(v -> {
-            boolean isVisible = binding.layoutFilter.getVisibility() == View.VISIBLE;
-            binding.layoutFilter.setVisibility(isVisible ? View.GONE : View.VISIBLE);
-            
-            binding.btnToggleFilter.setImageResource(isVisible ? 
-                    android.R.drawable.ic_menu_search : 
-                    android.R.drawable.ic_menu_close_clear_cancel);
-
-            if (isVisible) {
-                binding.etSearchAppointment.setText("");
-                binding.spinnerStatus.setSelection(0);
-                binding.spinnerStore.setSelection(0);
-                binding.btnMyAppointments.setChecked(false);
-                selectedCalendarDay = null;
-                binding.calendarView.clearSelection();
-                loadAppointmentData();
-            }
-        });
     }
 
-    /**
-     * Sets up the date selection listener for the calendar.
-     */
     private void setupCalendar() {
         binding.calendarView.setOnDateChangedListener((widget, date, selected) -> {
             if (selected) {
@@ -204,17 +171,11 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         });
     }
 
-    /**
-     * Updates calendar indicators to highlight dates that have scheduled appointments.
-     */
     private void updateCalendarDecorators() {
         HashSet<CalendarDay> datesWithAppointments = new HashSet<>();
-        SimpleDateFormat displayFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
         for (AppointmentDTO appointment : appointmentList) {
             try {
-                //Get the appointment date
-                Date date = displayFormat.parse(appointment.getAppointmentDate());
-                //if the date is not null, add it to the hashset
+                Date date = dateFormat.parse(appointment.getAppointmentDate());
                 if (date != null) {
                     Calendar cal = Calendar.getInstance();
                     cal.setTime(date);
@@ -224,56 +185,27 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
                 Log.e("AppointmentFragment", "Error parsing date: " + appointment.getAppointmentDate());
             }
         }
-        //update the indicators to the calendar
         binding.calendarView.removeDecorators();
         binding.calendarView.addDecorator(new EventDecorator(Color.RED, datesWithAppointments));
     }
 
-    /**
-     * Configures the search bar for filtering.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchAppointment, this::loadAppointmentData);
     }
 
-    /**
-     * Configures the status filter spinner.
-     */
     private void setupStatusFilter() {
         String[] statuses = {"All Statuses", "Booked", "Completed", "Cancelled", "Missed"};
         SpinnerUtils.setupStringFilterSpinner(requireContext(), binding.spinnerStatus, statuses, this::loadAppointmentData);
     }
 
-    /**
-     * Configures the store filter spinner.
-     */
     private void setupStoreFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerStore, this::loadAppointmentData);
     }
 
-    /**
-     * Fetches store data to populate the store filter.
-     */
-    private void loadStoreData() {
-        storeViewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, storeList,
-                        StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
-            }
-        });
-    }
-
-    /**
-     * Initializes the SwipeRefreshLayout to allow manual data refreshing.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshAppointment.setOnRefreshListener(this::loadAppointmentData);
     }
 
-    /**
-     * Navigates to the appointment detail screen for editing or creating an appointment.
-     */
     private void openAppointmentDetails(int position) {
         Bundle args = new Bundle();
         if (position != -1) {
@@ -283,9 +215,6 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         NavHostFragment.findNavController(this).navigate(R.id.nav_appointment_detail, args);
     }
 
-    /**
-     * Handles item click in the appointment list.
-     */
     @Override
     public void onAppointmentClick(int position) {
         openAppointmentDetails(position);
@@ -298,16 +227,14 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         }
     }
 
-    /**
-     * Fetches appointment data from the server with all active filters.
-     */
     private void loadAppointmentData() {
         String query = binding.etSearchAppointment.getText().toString().trim();
         String status = binding.spinnerStatus.getSelectedItem() != null ? binding.spinnerStatus.getSelectedItem().toString() : "All Statuses";
         
         Long storeId = null;
-        if (binding.spinnerStore.getSelectedItemPosition() > 0 && !storeList.isEmpty()) {
-            storeId = storeList.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
+        List<StoreDTO> stores = viewModel.getStores().getValue();
+        if (binding.spinnerStore.getSelectedItemPosition() > 0 && stores != null && !stores.isEmpty()) {
+            storeId = stores.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
         }
 
         String selectedDateString = null;
@@ -324,41 +251,18 @@ public class AppointmentFragment extends Fragment implements AppointmentAdapter.
         if (status.equals("All Statuses")) status = null;
         else status = status.toUpperCase();
 
-        appointmentViewModel.getAllAppointments(0, 500, query, status, storeId, selectedDateString, employeeId).observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            // Check the status to see if the resource is loaded and display the data
-            switch (resource.status) {
-                case LOADING:
-                    // Show loading indicator
-                    binding.swipeRefreshAppointment.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    // Hide loading indicator and display data
-                    binding.swipeRefreshAppointment.setRefreshing(false);
-                    if (resource.data != null) {
-                        appointmentList.clear();
-                        appointmentList.addAll(resource.data.getContent());
-                        updateCalendarDecorators();
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    // Hide loading indicator and toast error message
-                    binding.swipeRefreshAppointment.setRefreshing(false);
-                    Toast.makeText(getContext(), "Failed to load appointments: " + resource.message, Toast.LENGTH_SHORT).show();
-                    Log.e("AppointmentFragment", "Error loading appointments: " + resource.message);
-                    break;
-            }
-        });
+        viewModel.loadAppointments(query, status, storeId, selectedDateString, employeeId);
     }
 
-    /**
-     * Initializes the RecyclerView for displaying appointments.
-     */
     private void setupRecyclerView() {
         adapter = new AppointmentAdapter(appointmentList, this);
         binding.recyclerViewAppointments.setLayoutManager(new LinearLayoutManager(getContext()));
         binding.recyclerViewAppointments.setAdapter(adapter);
     }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/InventoryFragment.java

@@ -1,7 +1,6 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -22,8 +21,7 @@ import com.example.petstoremobile.dtos.InventoryDTO;
 import com.example.petstoremobile.dtos.StoreDTO;
 import com.example.petstoremobile.utils.BulkDeleteHandler;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.InventoryViewModel;
-import com.example.petstoremobile.utils.Resource;
+import com.example.petstoremobile.viewmodels.InventoryListViewModel;
 import com.example.petstoremobile.utils.SpinnerUtils;
 
 import java.util.ArrayList;
@@ -34,33 +32,18 @@ import dagger.hilt.android.AndroidEntryPoint;
 @AndroidEntryPoint
 public class InventoryFragment extends Fragment implements InventoryAdapter.OnInventoryClickListener {
 
-    private static final String TAG = "InventoryFragment";
-    private static final int PAGE_SIZE = 20;
-
     private FragmentInventoryBinding binding;
     private final List<InventoryDTO> inventoryList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
     private InventoryAdapter adapter;
-    private InventoryViewModel viewModel;
+    private InventoryListViewModel viewModel;
     private BulkDeleteHandler bulkDeleteHandler;
 
-    // Pagination
-    private int currentPage = 0;
-    private boolean isLastPage = false;
-    private boolean isLoading = false;
-
-    /**
-     * Initializes the fragment and its ViewModel.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(InventoryViewModel.class);
+        viewModel = new ViewModelProvider(this).get(InventoryListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including the inventory list and search.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -72,8 +55,9 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
         setupSwipeRefresh();
         setupFilterToggle();
         setupBulkDelete();
+        observeViewModel();
+        
         loadInventory(true);
-        loadStoreData();
 
         binding.fabAddInventory.setOnClickListener(v -> openDetail(null));
 
@@ -82,6 +66,23 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getInventory().observe(getViewLifecycleOwner(), list -> {
+            inventoryList.clear();
+            inventoryList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getStores().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, list,
+                    StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshInventory.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -95,49 +96,30 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
         );
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+        viewModel.loadStores();
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchInventory, binding.spinnerStore);
     }
 
-    /**
-     * Sets up the search bar for filtering.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchInventory, () -> loadInventory(true));
     }
 
-    /**
-     * Configures the store filter spinner.
-     */
     private void setupStoreFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerStore, () -> loadInventory(true));
     }
 
-    /**
-     * Fetches store data to populate the store filter.
-     */
-    private void loadStoreData() {
-        viewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, storeList,
-                        StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
-            }
-        });
-    }
-
-    /**
-     * Initializes the RecyclerView with a layout manager, and adapter.
-     */
     private void setupRecyclerView() {
         adapter = new InventoryAdapter(inventoryList, this);
         binding.recyclerViewInventory.setLayoutManager(new LinearLayoutManager(getContext()));
@@ -146,105 +128,45 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
         binding.recyclerViewInventory.addOnScrollListener(new RecyclerView.OnScrollListener() {
             @Override
             public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
-                if (dy <= 0)
-                    return;
+                if (dy <= 0) return;
                 LinearLayoutManager lm = (LinearLayoutManager) binding.recyclerViewInventory.getLayoutManager();
-                if (lm == null)
-                    return;
+                if (lm == null) return;
                 int visible = lm.getChildCount();
                 int total = lm.getItemCount();
                 int firstVis = lm.findFirstVisibleItemPosition();
-                if (!isLoading && !isLastPage && (visible + firstVis) >= total - 3) {
+                Boolean isLoading = viewModel.getIsLoading().getValue();
+                if ((isLoading == null || !isLoading) && !viewModel.isLastPage() && (visible + firstVis) >= total - 3) {
                     loadInventory(false);
                 }
             }
         });
     }
 
-    /**
-     * Sets up the SwipeRefreshLayout to reload the first page of inventory items.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshInventory.setOnRefreshListener(() -> loadInventory(true));
     }
 
-    /**
-     * Fetches a page of inventory items from the API.
-     */
     private void loadInventory(boolean reset) {
-        if (isLoading) return;
-
-        if (reset) {
-            currentPage = 0;
-            isLastPage = false;
-        }
-
-        // Search text from input
         String query = binding.etSearchInventory != null ? binding.etSearchInventory.getText().toString().trim() : "";
         if (query.isEmpty()) query = null;
 
         Long storeId = null;
-        if (binding.spinnerStore.getSelectedItemPosition() > 0 && !storeList.isEmpty()) {
-            storeId = storeList.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
+        List<StoreDTO> stores = viewModel.getStores().getValue();
+        if (binding.spinnerStore.getSelectedItemPosition() > 0 && stores != null && !stores.isEmpty()) {
+            storeId = stores.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
         }
 
-        //Load all inventory items from the backend using viewModel
-        viewModel.getAllInventory(query, storeId, currentPage, PAGE_SIZE, "product.prodName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            // Check the status to see if the resource is loaded and display the data
-            switch (resource.status) {
-                case LOADING:
-                    // Show loading indicator
-                    isLoading = true;
-                    binding.swipeRefreshInventory.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    // Hide loading indicator and display data
-                    isLoading = false;
-                    binding.swipeRefreshInventory.setRefreshing(false);
-                    if (resource.data != null) {
-                        if (reset) inventoryList.clear();
-                        inventoryList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                        isLastPage = resource.data.isLast();
-                        if (!isLastPage) currentPage++;
-                    }
-                    break;
-                case ERROR:
-                    // Hide loading indicator and toast error message
-                    isLoading = false;
-                    binding.swipeRefreshInventory.setRefreshing(false);
-                    Log.e(TAG, "Error: " + resource.message);
-                    Toast.makeText(getContext(), "Failed to load inventory: " + resource.message, Toast.LENGTH_SHORT).show();
-                    break;
-            }
-        });
+        viewModel.loadInventory(reset, query, storeId);
     }
 
-    /**
-     * Navigates to the inventory detail screen for a specific item or to add a new one.
-     */
     private void openDetail(InventoryDTO inv) {
         Bundle args = new Bundle();
-
         if (inv != null) {
             args.putLong("inventoryId", inv.getInventoryId());
         }
-
         NavHostFragment.findNavController(this).navigate(R.id.nav_inventory_detail, args);
     }
 
-    /**
-     * Reloads inventory data when changes occur.
-     */
-    public void onInventoryChanged() {
-        loadInventory(true);
-    }
-
-    /**
-     * Handles item click in the inventory list.
-     */
     @Override
     public void onInventoryClick(int position) {
         if (position >= 0 && position < inventoryList.size()) {
@@ -252,9 +174,6 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
         }
     }
 
-    /**
-     * Updates the bulk deletion UI visibility and count when items are selected or deselected.
-     */
     @Override
     public void onSelectionChanged(int selectedCount) {
         if (bulkDeleteHandler != null) {

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/PetFragment.java

@@ -9,7 +9,6 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -25,8 +24,7 @@ import com.example.petstoremobile.utils.BulkDeleteHandler;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.PetViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
+import com.example.petstoremobile.viewmodels.PetListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -40,28 +38,19 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class PetFragment extends Fragment implements PetAdapter.OnPetClickListener {
     private FragmentPetBinding binding;
     private List<PetDTO> petList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
     private PetAdapter adapter;
-    private PetViewModel viewModel;
-    private StoreViewModel storeViewModel;
+    private PetListViewModel viewModel;
     private BulkDeleteHandler bulkDeleteHandler;
 
     @Inject @Named("baseUrl") String baseUrl;
     @Inject TokenManager tokenManager;
 
-    /**
-     * Initializes the fragment and its associated ViewModels.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(PetViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(PetListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including RecyclerView, filters, and swipe-to-refresh.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -75,6 +64,7 @@ public class PetFragment extends Fragment implements PetAdapter.OnPetClickListen
         setupSwipeRefresh();
         setupFilterToggle();
         setupBulkDelete();
+        observeViewModel();
 
         binding.fabAddPet.setOnClickListener(v -> openPetDetails());
 
@@ -83,6 +73,23 @@ public class PetFragment extends Fragment implements PetAdapter.OnPetClickListen
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getPets().observe(getViewLifecycleOwner(), list -> {
+            petList.clear();
+            petList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getStores().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, list,
+                    StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshPet.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -96,83 +103,62 @@ public class PetFragment extends Fragment implements PetAdapter.OnPetClickListen
         );
     }
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        binding = null;
-    }
-
-    /**
-     * Reloads data every time the fragment becomes visible.
-     */
     @Override
     public void onResume() {
         super.onResume();
         loadPetData();
-        loadStoreData();
+        viewModel.loadStores();
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchPet,
                 binding.spinnerStatus, binding.spinnerSpecies, binding.spinnerStore);
     }
 
-    /**
-     * Configures the search bar.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchPet, this::loadPetData);
     }
 
-    /**
-     * Configures the status filter spinner.
-     */
     private void setupStatusFilter() {
         String[] statuses = {"All Statuses", "Available", "Adopted", "Owned"};
         SpinnerUtils.setupStringFilterSpinner(requireContext(), binding.spinnerStatus, statuses, this::loadPetData);
     }
 
-    /**
-     * Configures the species filter spinner with species.
-     */
     private void setupSpeciesFilter() {
         String[] species = {"All Species", "Dog", "Cat", "Bird", "Rabbit", "Fish", "Hamster"};
         SpinnerUtils.setupStringFilterSpinner(requireContext(), binding.spinnerSpecies, species, this::loadPetData);
     }
 
-    /**
-     * Configures the store filter spinner.
-     */
     private void setupStoreFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerStore, this::loadPetData);
     }
 
-    /**
-     * Fetches store data to populate the store filter.
-     */
-    private void loadStoreData() {
-        storeViewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, storeList,
-                        StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
-            }
-        });
-    }
-
-    /**
-     * Sets up the SwipeRefreshLayout.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshPet.setOnRefreshListener(this::loadPetData);
     }
 
-    /**
-     * Navigates to the pet profile screen.
-     */
+    private void loadPetData() {
+        String query = binding.etSearchPet.getText().toString().trim();
+        String status = binding.spinnerStatus.getSelectedItem() != null ? binding.spinnerStatus.getSelectedItem().toString() : "All Statuses";
+        String species = binding.spinnerSpecies.getSelectedItem() != null ? binding.spinnerSpecies.getSelectedItem().toString() : "All Species";
+        
+        Long storeId = null;
+        List<StoreDTO> stores = viewModel.getStores().getValue();
+        if (binding.spinnerStore.getSelectedItemPosition() > 0 && stores != null && !stores.isEmpty()) {
+            storeId = stores.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
+        }
+
+        viewModel.loadPets(query, status, species, storeId);
+    }
+
+    private void setupRecyclerView() {
+        adapter = new PetAdapter(petList, this);
+        adapter.setBaseUrl(baseUrl);
+        adapter.setToken(tokenManager.getToken());
+        binding.recyclerViewPets.setLayoutManager(new LinearLayoutManager(getContext()));
+        binding.recyclerViewPets.setAdapter(adapter);
+    }
+
     private void openPetProfile(int position) {
         Bundle args = new Bundle();
         PetDTO pet = petList.get(position);
@@ -180,9 +166,6 @@ public class PetFragment extends Fragment implements PetAdapter.OnPetClickListen
         NavHostFragment.findNavController(this).navigate(R.id.nav_pet_profile, args);
     }
 
-    /**
-     * Navigates to the pet detail screen.
-     */
     private void openPetDetails() {
         NavHostFragment.findNavController(this).navigate(R.id.nav_pet_detail);
     }
@@ -199,54 +182,9 @@ public class PetFragment extends Fragment implements PetAdapter.OnPetClickListen
         }
     }
 
-    /**
-     * Fetches pet data from the server with all active filters.
-     */
-    private void loadPetData() {
-        String query = binding.etSearchPet.getText().toString().trim();
-        String status = binding.spinnerStatus.getSelectedItem() != null ? binding.spinnerStatus.getSelectedItem().toString() : "All Statuses";
-        String species = binding.spinnerSpecies.getSelectedItem() != null ? binding.spinnerSpecies.getSelectedItem().toString() : "All Species";
-        
-        Long storeId = null;
-        if (binding.spinnerStore.getSelectedItemPosition() > 0 && !storeList.isEmpty()) {
-            storeId = storeList.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
-        }
-
-        if (status.equals("All Statuses")) status = null;
-        if (species.equals("All Species")) species = null;
-
-        viewModel.getAllPets(0, 100, query, status, species, storeId, "petName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-            
-            switch (resource.status) {
-                case LOADING:
-                    binding.swipeRefreshPet.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    binding.swipeRefreshPet.setRefreshing(false);
-                    if (resource.data != null) {
-                        petList.clear();
-                        petList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    binding.swipeRefreshPet.setRefreshing(false);
-                    Toast.makeText(getContext(), "Failed to load pets: " + resource.message, Toast.LENGTH_SHORT).show();
-                    Log.e("PetFragment", "Error loading pets: " + resource.message);
-                    break;
-            }
-        });
-    }
-
-    /**
-     * Initializes the RecyclerView.
-     */
-    private void setupRecyclerView() {
-        adapter = new PetAdapter(petList, this);
-        adapter.setBaseUrl(baseUrl);
-        adapter.setToken(tokenManager.getToken());
-        binding.recyclerViewPets.setLayoutManager(new LinearLayoutManager(getContext()));
-        binding.recyclerViewPets.setAdapter(adapter);
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
     }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/ProductFragment.java

@@ -9,21 +9,18 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.adapters.ProductAdapter;
 import com.example.petstoremobile.databinding.FragmentProductBinding;
 import com.example.petstoremobile.dtos.CategoryDTO;
 import com.example.petstoremobile.dtos.ProductDTO;
-import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.ProductViewModel;
+import com.example.petstoremobile.viewmodels.ProductListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -38,24 +35,17 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
 
     private FragmentProductBinding binding;
     private List<ProductDTO> productList = new ArrayList<>();
-    private List<CategoryDTO> categoryList = new ArrayList<>();
     private ProductAdapter adapter;
-    private ProductViewModel viewModel;
+    private ProductListViewModel viewModel;
 
     @Inject @Named("baseUrl") String baseUrl;
 
-    /**
-     * Initializes the fragment and its associated ProductViewModel.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(ProductViewModel.class);
+        viewModel = new ViewModelProvider(this).get(ProductListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including RecyclerView, search, and swipe-to-refresh.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -66,6 +56,7 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
         setupCategoryFilter();
         setupSwipeRefresh();
         setupFilterToggle();
+        observeViewModel();
 
         binding.fabAddProduct.setOnClickListener(v -> openProductDetails(-1));
 
@@ -74,67 +65,67 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
         return binding.getRoot();
     }
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        binding = null;
+    private void observeViewModel() {
+        viewModel.getProducts().observe(getViewLifecycleOwner(), list -> {
+            productList.clear();
+            productList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getCategories().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerCategory, list,
+                    CategoryDTO::getCategoryName, "All Categories", -1L, CategoryDTO::getCategoryId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshProduct.setRefreshing(loading);
+        });
     }
 
-    /**
-     * Reloads data every time the fragment becomes visible.
-     */
     @Override
     public void onResume() {
         super.onResume();
         loadProductData();
-        loadCategoryData();
+        viewModel.loadCategories();
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, 
                 binding.etSearchProduct, binding.spinnerCategory);
     }
 
-    /**
-     * Configures the search bar for triggering data load from backend.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchProduct, this::loadProductData);
     }
 
-    /**
-     * Configures the category filter spinner.
-     */
     private void setupCategoryFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerCategory, this::loadProductData);
     }
 
-    /**
-     * Fetches category data to populate the category filter.
-     */
-    private void loadCategoryData() {
-        viewModel.getAllCategories(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                categoryList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerCategory, categoryList,
-                        CategoryDTO::getCategoryName, "All Categories", -1L, CategoryDTO::getCategoryId);
-            }
-        });
-    }
-
-    /**
-     * Sets up the SwipeRefreshLayout.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshProduct.setOnRefreshListener(this::loadProductData);
     }
 
-    /**
-     * Navigates to the product detail screen.
-     */
+    private void loadProductData() {
+        String query = binding.etSearchProduct.getText().toString().trim();
+        if (query.isEmpty()) query = null;
+
+        Long categoryId = null;
+        List<CategoryDTO> categories = viewModel.getCategories().getValue();
+        if (binding.spinnerCategory.getSelectedItemPosition() > 0 && categories != null && !categories.isEmpty()) {
+            categoryId = categories.get(binding.spinnerCategory.getSelectedItemPosition() - 1).getCategoryId();
+        }
+
+        viewModel.loadProducts(query, categoryId);
+    }
+
+    private void setupRecyclerView() {
+        adapter = new ProductAdapter(productList, this);
+        adapter.setBaseUrl(baseUrl);
+        binding.recyclerViewProducts.setLayoutManager(new LinearLayoutManager(getContext()));
+        binding.recyclerViewProducts.setAdapter(adapter);
+    }
+
     private void openProductDetails(int position) {
         Bundle args = new Bundle();
         if (position != -1) {
@@ -149,51 +140,9 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
         openProductDetails(position);
     }
 
-    /**
-     * Fetches product data from the server with search query, category, and sorting.
-     */
-    private void loadProductData() {
-        String query = binding.etSearchProduct.getText().toString().trim();
-        if (query.isEmpty()) query = null;
-
-        Long categoryId = null;
-        if (binding.spinnerCategory.getSelectedItemPosition() > 0 && !categoryList.isEmpty()) {
-            categoryId = categoryList.get(binding.spinnerCategory.getSelectedItemPosition() - 1).getCategoryId();
-        }
-
-        viewModel.getAllProducts(query, categoryId, 0, 100, "prodName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            switch (resource.status) {
-                case LOADING:
-                    binding.swipeRefreshProduct.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    binding.swipeRefreshProduct.setRefreshing(false);
-                    if (resource.data != null) {
-                        productList.clear();
-                        productList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    binding.swipeRefreshProduct.setRefreshing(false);
-                    if (getContext() != null) {
-                        Toast.makeText(getContext(), "Failed to load products: " + resource.message, Toast.LENGTH_SHORT).show();
-                    }
-                    Log.e("ProductFragment", "Error loading products: " + resource.message);
-                    break;
-            }
-        });
-    }
-
-    /**
-     * Initializes the RecyclerView.
-     */
-    private void setupRecyclerView() {
-        adapter = new ProductAdapter(productList, this);
-        adapter.setBaseUrl(baseUrl);
-        binding.recyclerViewProducts.setLayoutManager(new LinearLayoutManager(getContext()));
-        binding.recyclerViewProducts.setAdapter(adapter);
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
     }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/ProductSupplierFragment.java

@@ -1,11 +1,9 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -21,12 +19,9 @@ import com.example.petstoremobile.dtos.ProductDTO;
 import com.example.petstoremobile.dtos.ProductSupplierDTO;
 import com.example.petstoremobile.dtos.SupplierDTO;
 import com.example.petstoremobile.utils.BulkDeleteHandler;
-import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.ProductSupplierViewModel;
-import com.example.petstoremobile.viewmodels.ProductViewModel;
-import com.example.petstoremobile.viewmodels.SupplierViewModel;
+import com.example.petstoremobile.viewmodels.ProductSupplierListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -39,29 +34,17 @@ public class ProductSupplierFragment extends Fragment
 
     private FragmentProductSupplierBinding binding;
     private List<ProductSupplierDTO> psList = new ArrayList<>();
-    private List<ProductDTO> productList = new ArrayList<>();
-    private List<SupplierDTO> supplierList = new ArrayList<>();
     
     private ProductSupplierAdapter adapter;
-    private ProductSupplierViewModel viewModel;
-    private ProductViewModel productViewModel;
-    private SupplierViewModel supplierViewModel;
+    private ProductSupplierListViewModel viewModel;
     private BulkDeleteHandler bulkDeleteHandler;
 
-    /**
-     * Initializes the fragment and its associated ViewModels.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(ProductSupplierViewModel.class);
-        productViewModel = new ViewModelProvider(this).get(ProductViewModel.class);
-        supplierViewModel = new ViewModelProvider(this).get(SupplierViewModel.class);
+        viewModel = new ViewModelProvider(this).get(ProductSupplierListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including the RecyclerView, search, and swipe-to-refresh.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -74,6 +57,7 @@ public class ProductSupplierFragment extends Fragment
         setupSwipeRefresh();
         setupFilterToggle();
         setupBulkDelete();
+        observeViewModel();
 
         binding.fabAddPS.setOnClickListener(v -> openDetail(-1));
 
@@ -82,6 +66,28 @@ public class ProductSupplierFragment extends Fragment
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getProductSuppliers().observe(getViewLifecycleOwner(), list -> {
+            psList.clear();
+            psList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getProducts().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerProduct, list,
+                    ProductDTO::getProdName, "All Products", -1L, ProductDTO::getProdId);
+        });
+
+        viewModel.getSuppliers().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerSupplier, list,
+                    SupplierDTO::getSupCompany, "All Suppliers", -1L, SupplierDTO::getSupId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshPS.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -95,136 +101,65 @@ public class ProductSupplierFragment extends Fragment
         );
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+        loadData();
+        viewModel.loadFilterData();
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Reloads data every time the fragment becomes visible.
-     */
-    @Override
-    public void onResume() {
-        super.onResume();
-        loadData();
-        loadFilterData();
-    }
-
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchPS,
                 binding.spinnerProduct, binding.spinnerSupplier);
     }
 
-    /**
-     * Initializes the RecyclerView with a layout manager and adapter for product-supplier data.
-     */
     private void setupRecyclerView() {
         adapter = new ProductSupplierAdapter(psList, this);
         binding.recyclerViewPS.setLayoutManager(new LinearLayoutManager(getContext()));
         binding.recyclerViewPS.setAdapter(adapter);
     }
 
-    /**
-     * Configures the search bar for filtering.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchPS, this::loadData);
     }
 
-    /**
-     * Configures the product filter spinner.
-     */
     private void setupProductFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerProduct, this::loadData);
     }
 
-    /**
-     * Configures the supplier filter spinner.
-     */
     private void setupSupplierFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerSupplier, this::loadData);
     }
 
-    /**
-     * Fetches products and suppliers to populate the filters.
-     */
-    private void loadFilterData() {
-        productViewModel.getAllProducts(null, null, 0, 100, "prodName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                productList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerProduct, productList,
-                        ProductDTO::getProdName, "All Products", -1L, ProductDTO::getProdId);
-            }
-        });
-
-        supplierViewModel.getAllSuppliers(0, 100, null, "supCompany").observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                supplierList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerSupplier, supplierList,
-                        SupplierDTO::getSupCompany, "All Suppliers", -1L, SupplierDTO::getSupId);
-            }
-        });
-    }
-
-    /**
-     * Sets up the SwipeRefreshLayout to allow manual reloading of product-supplier data.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshPS.setOnRefreshListener(this::loadData);
     }
 
-    /**
-     * Fetches product-supplier data from the server through the ViewModel with search query and filters.
-     */
     private void loadData() {
         String query = binding.etSearchPS.getText().toString().trim();
         if (query.isEmpty()) query = null;
 
         Long productId = null;
-        if (binding.spinnerProduct.getSelectedItemPosition() > 0 && !productList.isEmpty()) {
-            productId = productList.get(binding.spinnerProduct.getSelectedItemPosition() - 1).getProdId();
+        List<ProductDTO> products = viewModel.getProducts().getValue();
+        if (binding.spinnerProduct.getSelectedItemPosition() > 0 && products != null && !products.isEmpty()) {
+            productId = products.get(binding.spinnerProduct.getSelectedItemPosition() - 1).getProdId();
         }
 
         Long supplierId = null;
-        if (binding.spinnerSupplier.getSelectedItemPosition() > 0 && !supplierList.isEmpty()) {
-            supplierId = supplierList.get(binding.spinnerSupplier.getSelectedItemPosition() - 1).getSupId();
+        List<SupplierDTO> suppliers = viewModel.getSuppliers().getValue();
+        if (binding.spinnerSupplier.getSelectedItemPosition() > 0 && suppliers != null && !suppliers.isEmpty()) {
+            supplierId = suppliers.get(binding.spinnerSupplier.getSelectedItemPosition() - 1).getSupId();
         }
 
-        viewModel.getAllProductSuppliers(0, 100, query, productId, supplierId, "productName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            // Check the status to see if the resource is loaded and display the data
-            switch (resource.status) {
-                case LOADING:
-                    // Show loading indicator
-                    binding.swipeRefreshPS.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    // Hide loading indicator and display data
-                    binding.swipeRefreshPS.setRefreshing(false);
-                    if (resource.data != null) {
-                        psList.clear();
-                        psList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    // Hide loading indicator and toast error message
-                    binding.swipeRefreshPS.setRefreshing(false);
-                    Toast.makeText(getContext(), "Failed to load: " + resource.message, Toast.LENGTH_SHORT).show();
-                    Log.e("PSFragment", "Error loading: " + resource.message);
-                    break;
-            }
-        });
+        viewModel.loadProductSuppliers(query, productId, supplierId);
     }
 
-    /**
-     * Navigates to the product-supplier detail screen for a specific item or to add a new record.
-     */
     private void openDetail(int position) {
         Bundle args = new Bundle();
         if (position != -1) {
@@ -235,9 +170,6 @@ public class ProductSupplierFragment extends Fragment
         NavHostFragment.findNavController(this).navigate(R.id.nav_product_supplier_detail, args);
     }
 
-    /**
-     * Handles item click in the product-supplier list.
-     */
     @Override
     public void onProductSupplierClick(int position) { openDetail(position); }
 

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/PurchaseOrderFragment.java

@@ -1,11 +1,9 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -19,11 +17,9 @@ import com.example.petstoremobile.adapters.PurchaseOrderAdapter;
 import com.example.petstoremobile.databinding.FragmentPurchaseOrderBinding;
 import com.example.petstoremobile.dtos.PurchaseOrderDTO;
 import com.example.petstoremobile.dtos.StoreDTO;
-import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.PurchaseOrderViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
+import com.example.petstoremobile.viewmodels.PurchaseOrderListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -36,24 +32,15 @@ public class PurchaseOrderFragment extends Fragment
 
     private FragmentPurchaseOrderBinding binding;
     private List<PurchaseOrderDTO> poList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
     private PurchaseOrderAdapter adapter;
-    private PurchaseOrderViewModel viewModel;
-    private StoreViewModel storeViewModel;
+    private PurchaseOrderListViewModel viewModel;
 
-    /**
-     * Initializes the fragment and its associated ViewModels.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(PurchaseOrderViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(PurchaseOrderListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including RecyclerView, filters, and swipe-to-refresh.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -64,121 +51,72 @@ public class PurchaseOrderFragment extends Fragment
         setupStoreFilter();
         setupSwipeRefresh();
         setupFilterToggle();
+        observeViewModel();
 
         UIUtils.setupHamburgerMenu(binding.btnHamburgerPO, this);
 
         return binding.getRoot();
     }
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        binding = null;
+    private void observeViewModel() {
+        viewModel.getPurchaseOrders().observe(getViewLifecycleOwner(), list -> {
+            poList.clear();
+            poList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getStores().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, list,
+                    StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshPO.setRefreshing(loading);
+        });
     }
 
-    /**
-     * Reloads data every time the fragment becomes visible.
-     */
     @Override
     public void onResume() {
         super.onResume();
         loadData();
-        loadStoreData();
+        viewModel.loadStores();
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchPO, binding.spinnerStore);
     }
 
-    /**
-     * Configures the search bar for filtering.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchPO, this::loadData);
     }
 
-    /**
-     * Configures the store filter spinner.
-     */
     private void setupStoreFilter() {
         SpinnerUtils.setupFilterSpinner(binding.spinnerStore, this::loadData);
     }
 
-    /**
-     * Fetches store data to populate the store filter.
-     */
-    private void loadStoreData() {
-        storeViewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, storeList,
-                        StoreDTO::getStoreName, "All Stores", -1L, StoreDTO::getStoreId);
-            }
-        });
-    }
-
-    /**
-     * Initializes the RecyclerView with a layout manager and adapter.
-     */
     private void setupRecyclerView() {
         adapter = new PurchaseOrderAdapter(poList, this);
         binding.recyclerViewPO.setLayoutManager(new LinearLayoutManager(getContext()));
         binding.recyclerViewPO.setAdapter(adapter);
     }
 
-    /**
-     * Sets up the SwipeRefreshLayout to allow manual reloading of purchase order data.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshPO.setOnRefreshListener(this::loadData);
     }
 
-    /**
-     * Fetches purchase order data from the server with active filters and updates the UI.
-     */
     private void loadData() {
         String query = binding.etSearchPO != null ? binding.etSearchPO.getText().toString().trim() : "";
         if (query.isEmpty()) query = null;
 
         Long storeId = null;
-        if (binding.spinnerStore.getSelectedItemPosition() > 0 && !storeList.isEmpty()) {
-            storeId = storeList.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
+        List<StoreDTO> stores = viewModel.getStores().getValue();
+        if (binding.spinnerStore.getSelectedItemPosition() > 0 && stores != null && !stores.isEmpty()) {
+            storeId = stores.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
         }
 
-        viewModel.getAllPurchaseOrders(0, 100, query, storeId, "purchaseOrderId,desc").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            // Check the status to see if the resource is loaded and display the data
-            switch (resource.status) {
-                case LOADING:
-                    // Show loading indicator
-                    binding.swipeRefreshPO.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    // Hide loading indicator and display data
-                    binding.swipeRefreshPO.setRefreshing(false);
-                    if (resource.data != null) {
-                        poList.clear();
-                        poList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    // Hide loading indicator and toast error message
-                    binding.swipeRefreshPO.setRefreshing(false);
-                    Toast.makeText(getContext(), "Failed to load purchase orders: " + resource.message, Toast.LENGTH_SHORT).show();
-                    Log.e("POFragment", "Error loading purchase orders: " + resource.message);
-                    break;
-            }
-        });
+        viewModel.loadPurchaseOrders(query, storeId);
     }
 
-    /**
-     * Navigates to the purchase order detail screen for a specific record.
-     */
     private void openDetail(int position) {
         Bundle args = new Bundle();
         PurchaseOrderDTO po = poList.get(position);
@@ -186,11 +124,14 @@ public class PurchaseOrderFragment extends Fragment
         NavHostFragment.findNavController(this).navigate(R.id.nav_purchase_order_detail, args);
     }
 
-    /**
-     * Handles item click in the purchase order list.
-     */
     @Override
     public void onPurchaseOrderClick(int position) {
         openDetail(position);
     }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/SaleFragment.java

@@ -8,7 +8,6 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -19,11 +18,9 @@ import com.example.petstoremobile.adapters.SaleAdapter;
 import com.example.petstoremobile.databinding.FragmentSaleBinding;
 import com.example.petstoremobile.dtos.SaleDTO;
 import com.example.petstoremobile.dtos.StoreDTO;
-import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.SaleViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
+import com.example.petstoremobile.viewmodels.SaleListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -33,20 +30,10 @@ import dagger.hilt.android.AndroidEntryPoint;
 @AndroidEntryPoint
 public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickListener {
 
-    private static final String TAG = "SaleFragment";
-    private static final int PAGE_SIZE = 200;
-
     private FragmentSaleBinding binding;
     private final List<SaleDTO> saleList = new ArrayList<>();
-    private final List<StoreDTO> storeList = new ArrayList<>();
     private SaleAdapter adapter;
-    private SaleViewModel saleViewModel;
-    private StoreViewModel storeViewModel;
-
-    // Pagination
-    private int currentPage = 0;
-    private boolean isLastPage = false;
-    private boolean isLoading = false;
+    private SaleListViewModel viewModel;
 
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
@@ -58,8 +45,7 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
-        saleViewModel = new ViewModelProvider(this).get(SaleViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(SaleListViewModel.class);
 
         setupRecyclerView();
         setupSearch();
@@ -67,6 +53,8 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
         setupPaymentMethodFilter();
         setupSwipeRefresh();
         setupFilterToggle();
+        observeViewModel();
+        
         loadSales(true);
 
         UIUtils.setupHamburgerMenu(binding.btnHamburger, this);
@@ -78,10 +66,27 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
                 NavHostFragment.findNavController(this).navigate(R.id.nav_refund));
     }
 
+    private void observeViewModel() {
+        viewModel.getSales().observe(getViewLifecycleOwner(), list -> {
+            saleList.clear();
+            saleList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getStores().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, list,
+                    StoreDTO::getStoreName, "Stores", null, StoreDTO::getStoreId);
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshSale.setRefreshing(loading);
+        });
+    }
+
     @Override
     public void onResume() {
         super.onResume();
-        loadStoreData();
+        viewModel.loadStores();
     }
 
     private void setupFilterToggle() {
@@ -93,28 +98,11 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
         SpinnerUtils.setupFilterSpinner(binding.spinnerStore, () -> loadSales(true));
     }
 
-    private void loadStoreData() {
-        storeViewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList.clear();
-                storeList.addAll(resource.data.getContent());
-                SpinnerUtils.populateWhiteSpinner(requireContext(), binding.spinnerStore, storeList,
-                        StoreDTO::getStoreName, "Stores", null, StoreDTO::getStoreId);
-            }
-        });
-    }
-
     private void setupPaymentMethodFilter() {
         String[] paymentMethods = {"Payments", "Cash", "Card"};
         SpinnerUtils.setupStringFilterSpinner(requireContext(), binding.spinnerPaymentMethod, paymentMethods, () -> loadSales(true));
     }
 
-    @Override
-    public void onDestroyView() {
-        super.onDestroyView();
-        binding = null;
-    }
-
     private void setupRecyclerView() {
         adapter = new SaleAdapter(saleList, this);
         binding.recyclerViewSales.setLayoutManager(new LinearLayoutManager(getContext()));
@@ -129,7 +117,8 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
                     int visible = lm.getChildCount();
                     int total = lm.getItemCount();
                     int firstVis = lm.findFirstVisibleItemPosition();
-                    if (!isLoading && !isLastPage && (visible + firstVis) >= total - 3) {
+                    Boolean isLoading = viewModel.getIsLoading().getValue();
+                    if ((isLoading == null || !isLoading) && !viewModel.isLastPage() && (visible + firstVis) >= total - 3) {
                         loadSales(false);
                     }
                 }
@@ -146,13 +135,6 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
     }
 
     private void loadSales(boolean reset) {
-        if (isLoading) return;
-
-        if (reset) {
-            currentPage = 0;
-            isLastPage = false;
-        }
-
         String query = binding.etSearchSale != null ? binding.etSearchSale.getText().toString().trim() : "";
         if (query.isEmpty()) query = null;
 
@@ -162,39 +144,12 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
         }
 
         Long storeId = null;
-        if (binding.spinnerStore.getSelectedItemPosition() > 0 && !storeList.isEmpty()) {
-            storeId = storeList.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
+        List<StoreDTO> stores = viewModel.getStores().getValue();
+        if (binding.spinnerStore.getSelectedItemPosition() > 0 && stores != null && !stores.isEmpty()) {
+            storeId = stores.get(binding.spinnerStore.getSelectedItemPosition() - 1).getStoreId();
         }
 
-        saleViewModel.getAllSales(currentPage, PAGE_SIZE, query, paymentMethod, storeId, "saleDate,desc").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            switch (resource.status) {
-                case LOADING:
-                    isLoading = true;
-                    binding.swipeRefreshSale.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    isLoading = false;
-                    binding.swipeRefreshSale.setRefreshing(false);
-                    if (resource.data != null) {
-                        if (reset) saleList.clear();
-                        saleList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                        isLastPage = resource.data.isLast();
-                        if (!isLastPage) currentPage++;
-                    }
-                    break;
-                case ERROR:
-                    isLoading = false;
-                    binding.swipeRefreshSale.setRefreshing(false);
-                    Log.e(TAG, "Error loading sales: " + resource.message);
-                    if (getContext() != null) {
-                        Toast.makeText(getContext(), "Failed to load sales: " + resource.message, Toast.LENGTH_SHORT).show();
-                    }
-                    break;
-            }
-        });
+        viewModel.loadSales(reset, query, paymentMethod, storeId);
     }
 
     @Override
@@ -210,4 +165,10 @@ public class SaleFragment extends Fragment implements SaleAdapter.OnSaleClickLis
         }
         NavHostFragment.findNavController(this).navigate(R.id.nav_sale_detail, args);
     }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/ServiceFragment.java

@@ -1,7 +1,6 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -21,7 +20,7 @@ import com.example.petstoremobile.databinding.FragmentServiceBinding;
 import com.example.petstoremobile.dtos.ServiceDTO;
 import com.example.petstoremobile.utils.BulkDeleteHandler;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.ServiceViewModel;
+import com.example.petstoremobile.viewmodels.ServiceListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -34,32 +33,18 @@ import dagger.hilt.android.AndroidEntryPoint;
 @AndroidEntryPoint
 public class ServiceFragment extends Fragment implements ServiceAdapter.OnServiceClickListener {
 
-    private static final String TAG = "ServiceFragment";
-    private static final int PAGE_SIZE = 20;
-
     private FragmentServiceBinding binding;
     private final List<ServiceDTO> serviceList = new ArrayList<>();
     private ServiceAdapter adapter;
-    private ServiceViewModel viewModel;
+    private ServiceListViewModel viewModel;
     private BulkDeleteHandler bulkDeleteHandler;
 
-    // Pagination
-    private int currentPage = 0;
-    private boolean isLastPage = false;
-    private boolean isLoading = false;
-
-    /**
-     * Initializes the fragment and its associated ViewModel.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(ServiceViewModel.class);
+        viewModel = new ViewModelProvider(this).get(ServiceListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including RecyclerView, search, and swipe-to-refresh.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -70,15 +55,27 @@ public class ServiceFragment extends Fragment implements ServiceAdapter.OnServic
         setupSwipeRefresh();
         setupFilterToggle();
         setupBulkDelete();
+        observeViewModel();
+        
         loadServices(true);
 
-        binding.fabAddService.setOnClickListener(v -> openDetail(null));
-
         UIUtils.setupHamburgerMenu(binding.btnHamburger, this);
 
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getServices().observe(getViewLifecycleOwner(), list -> {
+            serviceList.clear();
+            serviceList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshService.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -98,23 +95,14 @@ public class ServiceFragment extends Fragment implements ServiceAdapter.OnServic
         binding = null;
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchService);
     }
 
-    /**
-     * Sets up the search bar for filtering.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchService, () -> loadServices(true));
     }
 
-    /**
-     * Initializes the RecyclerView with a layout manager and adapter.
-     */
     private void setupRecyclerView() {
         adapter = new ServiceAdapter(serviceList, this);
         binding.recyclerViewServices.setLayoutManager(new LinearLayoutManager(getContext()));
@@ -129,66 +117,24 @@ public class ServiceFragment extends Fragment implements ServiceAdapter.OnServic
                 int visible = lm.getChildCount();
                 int total = lm.getItemCount();
                 int firstVis = lm.findFirstVisibleItemPosition();
-                if (!isLoading && !isLastPage && (visible + firstVis) >= total - 3) {
+                Boolean isLoading = viewModel.getIsLoading().getValue();
+                if ((isLoading == null || !isLoading) && !viewModel.isLastPage() && (visible + firstVis) >= total - 3) {
                     loadServices(false);
                 }
             }
         });
     }
 
-    /**
-     * Sets up the SwipeRefreshLayout.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshService.setOnRefreshListener(() -> loadServices(true));
     }
 
-    /**
-     * Fetches a page of services from the API.
-     */
     private void loadServices(boolean reset) {
-        if (isLoading) return;
-
-        if (reset) {
-            currentPage = 0;
-            isLastPage = false;
-        }
-
         String query = binding.etSearchService.getText().toString().trim();
         if (query.isEmpty()) query = null;
-
-        viewModel.getAllServices(currentPage, PAGE_SIZE, query, "serviceName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            switch (resource.status) {
-                case LOADING:
-                    isLoading = true;
-                    binding.swipeRefreshService.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    isLoading = false;
-                    binding.swipeRefreshService.setRefreshing(false);
-                    if (resource.data != null) {
-                        if (reset) serviceList.clear();
-                        serviceList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                        isLastPage = resource.data.isLast();
-                        if (!isLastPage) currentPage++;
-                    }
-                    break;
-                case ERROR:
-                    isLoading = false;
-                    binding.swipeRefreshService.setRefreshing(false);
-                    Log.e(TAG, "Error: " + resource.message);
-                    Toast.makeText(getContext(), "Failed to load services: " + resource.message, Toast.LENGTH_SHORT).show();
-                    break;
-            }
-        });
+        viewModel.loadServices(reset, query);
     }
 
-    /**
-     * Navigates to the service detail screen.
-     */
     private void openDetail(ServiceDTO service) {
         Bundle args = new Bundle();
         if (service != null) {

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/StaffFragment.java

@@ -1,7 +1,6 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.util.Log;
 import android.view.*;
 import android.widget.*;
 import androidx.annotation.NonNull;
@@ -14,7 +13,7 @@ import com.example.petstoremobile.adapters.EmployeeAdapter;
 import com.example.petstoremobile.databinding.FragmentStaffBinding;
 import com.example.petstoremobile.dtos.EmployeeDTO;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.EmployeeViewModel;
+import com.example.petstoremobile.viewmodels.StaffListViewModel;
 import dagger.hilt.android.AndroidEntryPoint;
 import java.util.*;
 
@@ -22,21 +21,22 @@ import java.util.*;
 public class StaffFragment extends Fragment implements EmployeeAdapter.OnEmployeeClickListener {
 
     private FragmentStaffBinding binding;
-    private EmployeeViewModel employeeViewModel;
-    private List<EmployeeDTO> employeeList = new ArrayList<>();
-    private List<EmployeeDTO> filteredList = new ArrayList<>();
+    private StaffListViewModel viewModel;
+    private List<EmployeeDTO> staffList = new ArrayList<>();
     private EmployeeAdapter adapter;
 
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         binding = FragmentStaffBinding.inflate(inflater, container, false);
-        employeeViewModel = new ViewModelProvider(this).get(EmployeeViewModel.class);
+        viewModel = new ViewModelProvider(this).get(StaffListViewModel.class);
         
         setupRecyclerView();
         setupSearch();
         setupSwipeRefresh();
-        loadStaff();
+        observeViewModel();
+        
+        viewModel.loadStaff();
 
         binding.fabAddStaff.setOnClickListener(v -> openDetail(-1));
 
@@ -46,70 +46,36 @@ public class StaffFragment extends Fragment implements EmployeeAdapter.OnEmploye
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getFilteredEmployees().observe(getViewLifecycleOwner(), list -> {
+            staffList.clear();
+            staffList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshStaff.setRefreshing(loading);
+        });
+    }
+
     private void setupRecyclerView() {
-        adapter = new EmployeeAdapter(filteredList, this);
+        adapter = new EmployeeAdapter(staffList, this);
         binding.recyclerViewStaff.setLayoutManager(new LinearLayoutManager(getContext()));
         binding.recyclerViewStaff.setAdapter(adapter);
     }
 
     private void setupSearch() {
-        UIUtils.attachSearch(binding.etSearchStaff, () -> filter(binding.etSearchStaff.getText().toString()));
+        UIUtils.attachSearch(binding.etSearchStaff, () -> viewModel.filter(binding.etSearchStaff.getText().toString()));
     }
 
     private void setupSwipeRefresh() {
-        binding.swipeRefreshStaff.setOnRefreshListener(this::loadStaff);
-    }
-
-    private void filter(String query) {
-        filteredList.clear();
-        if (query.isEmpty()) {
-            filteredList.addAll(employeeList);
-        } else {
-            String lower = query.toLowerCase();
-            for (EmployeeDTO e : employeeList) {
-                if ((e.getFullName() != null && e.getFullName().toLowerCase().contains(lower))
-                        || (e.getUsername() != null && e.getUsername().toLowerCase().contains(lower))
-                        || (e.getEmail() != null && e.getEmail().toLowerCase().contains(lower))
-                        || (e.getPhone() != null && e.getPhone().toLowerCase().contains(lower))) {
-                    filteredList.add(e);
-                }
-            }
-        }
-        adapter.notifyDataSetChanged();
-    }
-
-    private void loadStaff() {
-        binding.swipeRefreshStaff.setRefreshing(true);
-        employeeViewModel.getAllEmployees(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null) {
-                switch (resource.status) {
-                    case SUCCESS:
-                        binding.swipeRefreshStaff.setRefreshing(false);
-                        if (resource.data != null) {
-                            employeeList.clear();
-                            employeeList.addAll(resource.data.getContent());
-                            filter(binding != null ? binding.etSearchStaff.getText().toString() : "");
-                        }
-                        break;
-                    case ERROR:
-                        binding.swipeRefreshStaff.setRefreshing(false);
-                        if (getContext() != null) {
-                            Toast.makeText(getContext(), resource.message != null ? resource.message : "Failed to load staff",
-                                    Toast.LENGTH_SHORT).show();
-                        }
-                        break;
-                    case LOADING:
-                        binding.swipeRefreshStaff.setRefreshing(true);
-                        break;
-                }
-            }
-        });
+        binding.swipeRefreshStaff.setOnRefreshListener(viewModel::loadStaff);
     }
 
     private void openDetail(int position) {
         Bundle args = new Bundle();
         if (position != -1) {
-            EmployeeDTO e = filteredList.get(position);
+            EmployeeDTO e = staffList.get(position);
             args.putLong("employeeId", e.getEmployeeId());
             args.putString("username", e.getUsername() != null ? e.getUsername() : "");
             args.putString("firstName", e.getFirstName() != null ? e.getFirstName() : "");

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/SupplierFragment.java

@@ -9,20 +9,17 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.adapters.SupplierAdapter;
 import com.example.petstoremobile.databinding.FragmentSupplierBinding;
 import com.example.petstoremobile.dtos.SupplierDTO;
 import com.example.petstoremobile.utils.BulkDeleteHandler;
-import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.SupplierViewModel;
+import com.example.petstoremobile.viewmodels.SupplierListViewModel;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -35,21 +32,15 @@ public class SupplierFragment extends Fragment implements SupplierAdapter.OnSupp
     private FragmentSupplierBinding binding;
     private List<SupplierDTO> supplierList = new ArrayList<>();
     private SupplierAdapter adapter;
-    private SupplierViewModel viewModel;
+    private SupplierListViewModel viewModel;
     private BulkDeleteHandler bulkDeleteHandler;
 
-    /**
-     * Initializes the fragment and its associated SupplierViewModel.
-     */
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(SupplierViewModel.class);
+        viewModel = new ViewModelProvider(this).get(SupplierListViewModel.class);
     }
 
-    /**
-     * Sets up the fragment's UI components, including RecyclerView, search, and swipe-to-refresh.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -60,9 +51,10 @@ public class SupplierFragment extends Fragment implements SupplierAdapter.OnSupp
         setupSwipeRefresh();
         setupFilterToggle();
         setupBulkDelete();
+        observeViewModel();
+        
         loadSupplierData();
 
-        //Add button to opens the add dialog
         binding.fabAddSupplier.setOnClickListener(v -> openSupplierDetails(-1));
 
         UIUtils.setupHamburgerMenu(binding.btnHamburger, this);
@@ -70,6 +62,18 @@ public class SupplierFragment extends Fragment implements SupplierAdapter.OnSupp
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getSuppliers().observe(getViewLifecycleOwner(), list -> {
+            supplierList.clear();
+            supplierList.addAll(list);
+            adapter.notifyDataSetChanged();
+        });
+
+        viewModel.getIsLoading().observe(getViewLifecycleOwner(), loading -> {
+            binding.swipeRefreshSupplier.setRefreshing(loading);
+        });
+    }
+
     private void setupBulkDelete() {
         bulkDeleteHandler = new BulkDeleteHandler(
                 this,
@@ -89,47 +93,27 @@ public class SupplierFragment extends Fragment implements SupplierAdapter.OnSupp
         binding = null;
     }
 
-    /**
-     * Sets up the filter toggle button to show/hide the filter layout.
-     */
     private void setupFilterToggle() {
         UIUtils.setupFilterToggle(binding.btnToggleFilter, binding.layoutFilter, binding.etSearchSupplier);
     }
 
-    /**
-     * Configures the search bar for filtering.
-     */
     private void setupSearch() {
         UIUtils.attachSearch(binding.etSearchSupplier, this::loadSupplierData);
     }
 
-    /**
-     * Sets up the SwipeRefreshLayout to allow manual reloading of supplier data.
-     */
     private void setupSwipeRefresh() {
         binding.swipeRefreshSupplier.setOnRefreshListener(this::loadSupplierData);
     }
 
-    /**
-     * Navigates to the supplier detail screen for editing an existing record or adding a new one.
-     */
     private void openSupplierDetails(int position) {
-        //Make a bundle to pass data to the detail fragment
         Bundle args = new Bundle();
-
-        //if editing a supplier, add the supplier id to the bundle
         if (position != -1) {
             SupplierDTO supplier = supplierList.get(position);
             args.putLong("supId", supplier.getSupId());
         }
-
         NavHostFragment.findNavController(this).navigate(R.id.nav_supplier_detail, args);
     }
 
-
-    /**
-     * Handles item click in the supplier list.
-     */
     @Override
     public void onSupplierClick(int position) {
         openSupplierDetails(position);
@@ -142,47 +126,12 @@ public class SupplierFragment extends Fragment implements SupplierAdapter.OnSupp
         }
     }
 
-    /**
-     * Fetches all supplier data from the server through the ViewModel and updates the UI.
-     */
     private void loadSupplierData() {
         String query = binding.etSearchSupplier != null ? binding.etSearchSupplier.getText().toString().trim() : "";
         if (query.isEmpty()) query = null;
-
-        //Load suppliers from the backend with query and default sort
-        viewModel.getAllSuppliers(0, 100, query, "supCompany").observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-
-            // Check the status to see if the resource is loaded and display the data
-            switch (resource.status) {
-                case LOADING:
-                    // Show loading indicator
-                    binding.swipeRefreshSupplier.setRefreshing(true);
-                    break;
-                case SUCCESS:
-                    // Hide loading indicator and display data
-                    binding.swipeRefreshSupplier.setRefreshing(false);
-                    if (resource.data != null) {
-                        supplierList.clear();
-                        supplierList.addAll(resource.data.getContent());
-                        adapter.notifyDataSetChanged();
-                    }
-                    break;
-                case ERROR:
-                    // Hide loading indicator and toast error message
-                    binding.swipeRefreshSupplier.setRefreshing(false);
-                    if (getContext() != null) {
-                        Toast.makeText(getContext(), "Failed to load suppliers: " + resource.message, Toast.LENGTH_SHORT).show();
-                    }
-                    Log.e("SupplierFragment", "Error loading suppliers: " + resource.message);
-                    break;
-            }
-        });
+        viewModel.loadSuppliers(query);
     }
 
-    /**
-     * Initializes the RecyclerView with a layout manager and adapter for displaying suppliers.
-     */
     private void setupRecyclerView() {
         adapter = new SupplierAdapter(supplierList, this);
         binding.recyclerViewSuppliers.setLayoutManager(new LinearLayoutManager(getContext()));

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/AdoptionDetailFragment.java

@@ -1,6 +1,5 @@
 package com.example.petstoremobile.fragments.listfragments.detailfragments;
 
-import android.app.DatePickerDialog;
 import android.os.Bundle;
 import android.view.*;
 import android.widget.*;
@@ -12,14 +11,13 @@ import androidx.navigation.fragment.NavHostFragment;
 
 import com.example.petstoremobile.databinding.FragmentAdoptionDetailBinding;
 import com.example.petstoremobile.dtos.*;
+import com.example.petstoremobile.utils.DateTimeUtils;
 import com.example.petstoremobile.utils.DialogUtils;
+import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
-import com.example.petstoremobile.viewmodels.AdoptionViewModel;
-import com.example.petstoremobile.viewmodels.CustomerViewModel;
-import com.example.petstoremobile.viewmodels.PetViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
-import com.example.petstoremobile.viewmodels.UserViewModel;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.AdoptionDetailViewModel;
 
 import java.math.BigDecimal;
 import java.util.*;
@@ -33,35 +31,19 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class AdoptionDetailFragment extends Fragment {
 
     private FragmentAdoptionDetailBinding binding;
+    private AdoptionDetailViewModel viewModel;
 
-    private long adoptionId = -1;
-    private boolean isEditing = false;
     private long preselectedPetId = -1;
     private long preselectedCustomerId = -1;
     private long preselectedStoreId = -1;
     private long preselectedEmployeeId = -1;
 
-    private List<PetDTO> petList = new ArrayList<>();
-    private List<CustomerDTO> customerList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
-    private List<UserDTO> employeeList = new ArrayList<>();
-
     private final String[] STATUSES = {"Pending", "Completed", "Cancelled"};
 
-    private AdoptionViewModel adoptionViewModel;
-    private PetViewModel petViewModel;
-    private CustomerViewModel customerViewModel;
-    private StoreViewModel storeViewModel;
-    private UserViewModel userViewModel;
-
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        adoptionViewModel = new ViewModelProvider(this).get(AdoptionViewModel.class);
-        petViewModel = new ViewModelProvider(this).get(PetViewModel.class);
-        customerViewModel = new ViewModelProvider(this).get(CustomerViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
-        userViewModel = new ViewModelProvider(this).get(UserViewModel.class);
+        viewModel = new ViewModelProvider(this).get(AdoptionDetailViewModel.class);
     }
 
     @Override
@@ -76,6 +58,7 @@ public class AdoptionDetailFragment extends Fragment {
         super.onViewCreated(view, savedInstanceState);
         setupSpinners();
         setupDatePicker();
+        observeViewModel();
         loadSpinnersData();
         handleArguments();
 
@@ -84,155 +67,146 @@ public class AdoptionDetailFragment extends Fragment {
         binding.btnDeleteAdoption.setOnClickListener(v -> confirmDelete());
     }
 
+    private void observeViewModel() {
+        viewModel.getPetList().observe(getViewLifecycleOwner(), list -> refreshPetSpinner());
+        viewModel.getCustomerList().observe(getViewLifecycleOwner(), list -> refreshCustomerSpinner());
+        viewModel.getStoreList().observe(getViewLifecycleOwner(), list -> refreshStoreSpinner());
+        viewModel.getEmployeeList().observe(getViewLifecycleOwner(), list -> refreshEmployeeSpinner());
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Configures the spinner for adoption status.
-     */
     private void setupSpinners() {
         SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerAdoptionStatus, STATUSES);
+
+        UIUtils.setViewsEnabled(false, binding.spinnerAdoptionPet);
+
+        binding.spinnerAdoptionCustomer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                if (position > 0) {
+                    UIUtils.setViewsEnabled(true, binding.spinnerAdoptionPet);
+                } else {
+                    if (!viewModel.isEditing()) {
+                        binding.spinnerAdoptionPet.setSelection(0);
+                        UIUtils.setViewsEnabled(false, binding.spinnerAdoptionPet);
+                    }
+                }
+            }
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {}
+        });
+
+        binding.spinnerAdoptionStore.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                if (position > 0 && viewModel.getStoreList().getValue() != null && position <= viewModel.getStoreList().getValue().size()) {
+                    DropdownDTO selectedStore = viewModel.getStoreList().getValue().get(position - 1);
+                    loadEmployees(selectedStore.getId());
+                } else {
+                    viewModel.setEmployeeList(new ArrayList<>());
+                }
+            }
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {}
+        });
     }
 
-    /**
-     * Configures the date picker dialog for the adoption date field.
-     */
     private void setupDatePicker() {
-        binding.etAdoptionDate.setOnClickListener(v -> {
-            Calendar c = Calendar.getInstance();
-            new DatePickerDialog(requireContext(),
-                    (dp, y, m, d) -> binding.etAdoptionDate.setText(
-                            String.format("%04d-%02d-%02d", y, m + 1, d)),
-                    c.get(Calendar.YEAR),
-                    c.get(Calendar.MONTH),
-                    c.get(Calendar.DAY_OF_MONTH)).show();
-        });
+        binding.etAdoptionDate.setOnClickListener(v -> UIUtils.showDatePicker(requireContext(), binding.etAdoptionDate, null));
     }
 
-    /**
-     * Fetches required data for spinners from the backend.
-     */
     private void loadSpinnersData() {
-        loadPets();
-        loadCustomers();
-        loadStores();
-        loadEmployees();
-    }
-
-    /**
-     * Loads the list of pets from the API.
-     */
-    private void loadPets() {
-        petViewModel.getAllPets(0, 200, null, null, null, null, "petName").observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadPets().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                petList = resource.data.getContent();
-                refreshPetSpinner();
+                viewModel.setPetList(resource.data);
+            }
+        });
+        viewModel.loadCustomers().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setCustomerList(resource.data);
+            }
+        });
+        viewModel.loadStores().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setStoreList(resource.data);
             }
         });
     }
 
-    /**
-     * Populates the pet selection spinner with data.
-     */
     private void refreshPetSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionPet, petList,
-                PetDTO::getPetName, "-- Select Pet --",
-                preselectedPetId, PetDTO::getPetId);
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionPet, viewModel.getPetList().getValue(),
+                DropdownDTO::getLabel, "-- Select Pet --",
+                preselectedPetId, DropdownDTO::getId);
     }
 
-    /**
-     * Loads the list of customers from the API.
-     */
-    private void loadCustomers() {
-        customerViewModel.getAllCustomers(0, 200).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                customerList = resource.data.getContent();
-                refreshCustomerSpinner();
-            }
-        });
-    }
-
-    /**
-     * Populates the customer selection spinner with data.
-     */
     private void refreshCustomerSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionCustomer, customerList,
-                item -> item.getFirstName() + " " + item.getLastName(),
-                "-- Select Customer --",
-                preselectedCustomerId, CustomerDTO::getCustomerId);
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionCustomer, viewModel.getCustomerList().getValue(),
+                DropdownDTO::getLabel, "-- Select Customer --",
+                preselectedCustomerId, DropdownDTO::getId);
     }
 
-    /**
-     * Loads the list of stores from the API.
-     */
-    private void loadStores() {
-        storeViewModel.getAllStores(0, 200).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                refreshStoreSpinner();
-            }
-        });
-    }
-
-    /**
-     * Populates the store selection spinner with data.
-     */
     private void refreshStoreSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionStore, storeList,
-                StoreDTO::getStoreName, "-- Select Store --",
-                preselectedStoreId, StoreDTO::getStoreId);
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionStore, viewModel.getStoreList().getValue(),
+                DropdownDTO::getLabel, "-- Select Store --",
+                preselectedStoreId, DropdownDTO::getId);
     }
 
-    /**
-     * Loads the list of employees from the API.
-     */
-    private void loadEmployees() {
-        userViewModel.getUsers("STAFF", 0, 100).observe(getViewLifecycleOwner(), resource -> {
+    private void loadEmployees(Long storeId) {
+        viewModel.loadEmployees(storeId).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                employeeList = resource.data.getContent();
-                refreshEmployeeSpinner();
+                viewModel.setEmployeeList(resource.data);
             }
         });
     }
 
-    /**
-     * Populates the employee selection spinner with data.
-     */
     private void refreshEmployeeSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionEmployee, employeeList,
-                UserDTO::getFullName, "-- Select Staff --",
-                preselectedEmployeeId, UserDTO::getId);
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionEmployee, viewModel.getEmployeeList().getValue(),
+                DropdownDTO::getLabel, "-- Select Staff --",
+                preselectedEmployeeId, DropdownDTO::getId);
     }
 
-    /**
-     * Handles arguments to determine if the fragment is in edit or add mode.
-     */
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.containsKey("adoptionId")) {
-            isEditing = true;
-            adoptionId = a.getLong("adoptionId");
+            long adoptionId = a.getLong("adoptionId");
+            viewModel.setAdoptionId(adoptionId);
             binding.tvAdoptionMode.setText("Edit Adoption");
-            binding.tvAdoptionId.setText("ID: " + adoptionId);
+            binding.tvAdoptionId.setText(DateTimeUtils.formatId(adoptionId));
             binding.tvAdoptionId.setVisibility(View.VISIBLE);
             binding.btnDeleteAdoption.setVisibility(View.VISIBLE);
             loadAdoptionData();
         } else {
+            viewModel.setAdoptionId(-1);
             binding.tvAdoptionMode.setText("Add Adoption");
             binding.btnDeleteAdoption.setVisibility(View.GONE);
             binding.tvAdoptionId.setVisibility(View.GONE);
+            UIUtils.setViewsEnabled(false, binding.spinnerAdoptionPet);
         }
     }
 
-    /**
-     * Fetches specific adoption details from the backend using the ID.
-     */
     private void loadAdoptionData() {
-        adoptionViewModel.getAdoptionById(adoptionId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadAdoption().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 AdoptionDTO a = resource.data;
                 preselectedPetId = a.getPetId() != null ? a.getPetId() : -1;
@@ -247,90 +221,68 @@ public class AdoptionDetailFragment extends Fragment {
                 refreshPetSpinner();
                 refreshCustomerSpinner();
                 refreshStoreSpinner();
-                refreshEmployeeSpinner();
+                
+                if (preselectedCustomerId != -1) {
+                    UIUtils.setViewsEnabled(true, binding.spinnerAdoptionPet);
+                }
             } else if (resource.status == Resource.Status.ERROR) {
                 Toast.makeText(getContext(), "Failed to load adoption: " + resource.message, Toast.LENGTH_SHORT).show();
             }
         });
     }
 
-    /**
-     * Validates input and saves the adoption request to the backend.
-     */
     private void saveAdoption() {
-        if (binding.spinnerAdoptionCustomer.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a customer", Toast.LENGTH_SHORT).show(); return;
-        }
-        if (binding.spinnerAdoptionPet.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a pet", Toast.LENGTH_SHORT).show(); return;
-        }
-        if (binding.spinnerAdoptionStore.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a store", Toast.LENGTH_SHORT).show(); return;
-        }
-        String date = binding.etAdoptionDate.getText().toString().trim();
-        if (date.isEmpty()) {
-            Toast.makeText(getContext(), "Select a date", Toast.LENGTH_SHORT).show(); return;
-        }
+        if (!InputValidator.isSpinnerSelected(binding.spinnerAdoptionCustomer, "Customer")) return;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerAdoptionPet, "Pet")) return;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerAdoptionStore, "Store")) return;
+        if (!InputValidator.isNotEmpty(binding.etAdoptionDate, "Adoption Date")) return;
 
         BigDecimal fee = BigDecimal.ZERO;
         String feeStr = binding.etAdoptionFee.getText().toString().trim();
         if (!feeStr.isEmpty()) {
-            try {
-                fee = new BigDecimal(feeStr);
-            } catch (NumberFormatException e) {
-                Toast.makeText(getContext(), "Invalid fee format", Toast.LENGTH_SHORT).show();
-                return;
-            }
+            if (!InputValidator.isPositiveDecimal(binding.etAdoptionFee, "Adoption Fee")) return;
+            fee = new BigDecimal(feeStr);
         }
 
-        CustomerDTO customer = customerList.get(binding.spinnerAdoptionCustomer.getSelectedItemPosition() - 1);
-        PetDTO pet           = petList.get(binding.spinnerAdoptionPet.getSelectedItemPosition() - 1);
-        StoreDTO store       = storeList.get(binding.spinnerAdoptionStore.getSelectedItemPosition() - 1);
+        DropdownDTO customer = viewModel.getCustomerList().getValue().get(binding.spinnerAdoptionCustomer.getSelectedItemPosition() - 1);
+        DropdownDTO pet      = viewModel.getPetList().getValue().get(binding.spinnerAdoptionPet.getSelectedItemPosition() - 1);
+        DropdownDTO store    = viewModel.getStoreList().getValue().get(binding.spinnerAdoptionStore.getSelectedItemPosition() - 1);
         
         Long employeeId = null;
         if (binding.spinnerAdoptionEmployee.getSelectedItemPosition() > 0) {
-            employeeId = employeeList.get(binding.spinnerAdoptionEmployee.getSelectedItemPosition() - 1).getId();
+            employeeId = viewModel.getEmployeeList().getValue().get(binding.spinnerAdoptionEmployee.getSelectedItemPosition() - 1).getId();
         }
         
+        String adoptionDate  = binding.etAdoptionDate.getText().toString().trim();
         String status        = STATUSES[binding.spinnerAdoptionStatus.getSelectedItemPosition()];
 
         AdoptionDTO dto = new AdoptionDTO(
-                pet.getPetId(),
-                customer.getCustomerId(),
+                pet.getId(),
+                customer.getId(),
                 employeeId,
-                store.getStoreId(),
-                date,
+                store.getId(),
+                adoptionDate,
                 status,
                 fee
         );
 
-        if (isEditing) {
-            adoptionViewModel.updateAdoption(adoptionId, dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Updated", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        } else {
-            adoptionViewModel.createAdoption(dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Saved", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        }
+        viewModel.saveAdoption(dto).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS) {
+                Toast.makeText(getContext(), viewModel.isEditing() ? "Updated" : "Saved", Toast.LENGTH_SHORT).show();
+                navigateBack();
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
+            }
+        });
     }
 
-    /**
-     * Shows a confirmation dialog before deleting an adoption request.
-     */
     private void confirmDelete() {
-        DialogUtils.showDeleteConfirmDialog(requireContext(), "Adoption", () ->
-                adoptionViewModel.deleteAdoption(adoptionId).observe(getViewLifecycleOwner(), resource -> {
+        DialogUtils.showDeleteConfirmDialog(requireContext(), "Adoption Record", () ->
+                viewModel.deleteAdoption().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
                     if (resource.status == Resource.Status.SUCCESS) {
                         Toast.makeText(getContext(), "Deleted", Toast.LENGTH_SHORT).show();
                         navigateBack();
@@ -340,9 +292,6 @@ public class AdoptionDetailFragment extends Fragment {
                 }));
     }
 
-    /**
-     * Navigates back to the previous fragment.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/AppointmentDetailFragment.java

@@ -1,10 +1,12 @@
 package com.example.petstoremobile.fragments.listfragments.detailfragments;
 
-import android.app.DatePickerDialog;
 import android.os.Bundle;
-import android.util.Log;
-import android.view.*;
-import android.widget.*;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.Toast;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
@@ -12,18 +14,16 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 
 import com.example.petstoremobile.databinding.FragmentAppointmentDetailBinding;
-import com.example.petstoremobile.dtos.*;
+import com.example.petstoremobile.dtos.AppointmentDTO;
+import com.example.petstoremobile.dtos.DropdownDTO;
+import com.example.petstoremobile.dtos.ServiceDTO;
+import com.example.petstoremobile.utils.DateTimeUtils;
 import com.example.petstoremobile.utils.DialogUtils;
+import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
-import com.example.petstoremobile.viewmodels.AppointmentViewModel;
-import com.example.petstoremobile.viewmodels.CustomerViewModel;
-import com.example.petstoremobile.viewmodels.PetViewModel;
-import com.example.petstoremobile.viewmodels.ServiceViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
-import com.example.petstoremobile.viewmodels.UserViewModel;
-
-import java.util.*;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.AppointmentDetailViewModel;
 
 import dagger.hilt.android.AndroidEntryPoint;
 
@@ -35,39 +35,22 @@ public class AppointmentDetailFragment extends Fragment {
 
     private FragmentAppointmentDetailBinding binding;
 
-    private long appointmentId = -1;
-    private boolean isEditing = false;
     private long preselectedPetId = -1;
     private long preselectedServiceId = -1;
     private long preselectedCustomerId = -1;
     private long preselectedStoreId = -1;
     private long preselectedStaffId = -1;
 
-    private List<PetDTO> petList = new ArrayList<>();
-    private List<ServiceDTO> serviceList = new ArrayList<>();
-    private List<CustomerDTO> customerList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
-    private List<UserDTO> staffList = new ArrayList<>();
+    private final Integer[] HOURS = {9, 10, 11, 12, 13, 14, 15, 16, 17};
+    private final Integer[] MINUTES = {0, 15, 30, 45};
 
-    private final Integer[] HOURS = {9,10,11,12,13,14,15,16,17};
-    private final Integer[] MINUTES = {0,15,30,45};
-
-    private AppointmentViewModel appointmentViewModel;
-    private PetViewModel petViewModel;
-    private ServiceViewModel serviceViewModel;
-    private StoreViewModel storeViewModel;
-    private CustomerViewModel customerViewModel;
-    private UserViewModel userViewModel;
+    private AppointmentDetailViewModel viewModel;
+    private boolean isUpdatingUI = false;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        appointmentViewModel = new ViewModelProvider(this).get(AppointmentViewModel.class);
-        petViewModel = new ViewModelProvider(this).get(PetViewModel.class);
-        serviceViewModel = new ViewModelProvider(this).get(ServiceViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
-        customerViewModel = new ViewModelProvider(this).get(CustomerViewModel.class);
-        userViewModel = new ViewModelProvider(this).get(UserViewModel.class);
+        viewModel = new ViewModelProvider(this).get(AppointmentDetailViewModel.class);
     }
 
     @Override
@@ -81,7 +64,8 @@ public class AppointmentDetailFragment extends Fragment {
         super.onViewCreated(view, savedInstanceState);
         setupSpinners();
         setupDatePicker();
-        loadSpinnersData();
+        observeViewModel();
+        viewModel.loadInitialFormData();
         handleArguments();
 
         binding.btnApptBack.setOnClickListener(v -> navigateBack());
@@ -95,365 +79,214 @@ public class AppointmentDetailFragment extends Fragment {
         binding = null;
     }
 
-    /**
-     * Configures the adapters for spinners.
-     */
     private void setupSpinners() {
-        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerAppointmentStatus,
-                new String[]{"Booked", "Completed", "Cancelled", "Missed"});
+        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerAppointmentStatus, new String[]{});
 
         String[] hours = new String[HOURS.length];
         for (int i = 0; i < HOURS.length; i++)
-            hours[i] = String.format("%02d:00", HOURS[i]);
+            hours[i] = DateTimeUtils.formatTime(HOURS[i], 0);
         SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerHour, hours);
-        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerMinute, new String[]{"00","15","30","45"});
+        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerMinute, new String[]{"00", "15", "30", "45"});
+
+        UIUtils.setViewsEnabled(false, binding.spinnerPet, binding.spinnerStaff);
+
+        binding.spinnerCustomer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                viewModel.onCustomerSelected(position);
+            }
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {}
+        });
+
+        binding.spinnerStore.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                viewModel.onStoreSelected(position);
+            }
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {}
+        });
+
+        SpinnerUtils.setOnIndexSelectedListener(binding.spinnerService, p -> viewModel.onServiceSelected(p));
+        SpinnerUtils.setOnIndexSelectedListener(binding.spinnerPet, p -> viewModel.onPetSelected(p));
+        SpinnerUtils.setOnIndexSelectedListener(binding.spinnerStaff, p -> viewModel.onStaffSelected(p));
+
+        SpinnerUtils.setOnIndexSelectedListener(binding.spinnerHour, p -> notifyDateTimeStatusChange());
+        SpinnerUtils.setOnIndexSelectedListener(binding.spinnerMinute, p -> notifyDateTimeStatusChange());
+        SpinnerUtils.setOnIndexSelectedListener(binding.spinnerAppointmentStatus, p -> notifyDateTimeStatusChange());
     }
 
-    /**
-     * Configures the date picker dialog for the appointment date field.
-     */
     private void setupDatePicker() {
-        binding.etAppointmentDate.setOnClickListener(v -> {
-            Calendar c = Calendar.getInstance();
-            DatePickerDialog d = new DatePickerDialog(requireContext(),
-                    (dp,y,m,d1) -> binding.etAppointmentDate.setText(
-                            String.format("%04d-%02d-%02d", y, m+1, d1)),
-                    c.get(Calendar.YEAR), c.get(Calendar.MONTH),
-                    c.get(Calendar.DAY_OF_MONTH));
-            d.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
-            d.show();
-        });
+        binding.etAppointmentDate.setOnClickListener(v -> 
+                UIUtils.showDatePicker(requireContext(), binding.etAppointmentDate, this::notifyDateTimeStatusChange));
     }
 
-    /**
-     * Fetches all required data for spinners from the backend.
-     */
-    private void loadSpinnersData() {
-        loadPets();
-        loadServices();
-        loadCustomers();
-        loadStores();
-        loadStaff();
+    private void observeViewModel() {
+        viewModel.getViewState().observe(getViewLifecycleOwner(), this::applyViewState);
+        
+        viewModel.getCustomers().observe(getViewLifecycleOwner(), list ->
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerCustomer, list, DropdownDTO::getLabel, "-- Select Customer --", preselectedCustomerId, DropdownDTO::getId));
+        
+        viewModel.getStores().observe(getViewLifecycleOwner(), list ->
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerStore, list, DropdownDTO::getLabel, "-- Select Store --", preselectedStoreId, DropdownDTO::getId));
+        
+        viewModel.getServices().observe(getViewLifecycleOwner(), list ->
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerService, list, ServiceDTO::getServiceName, "-- Select Service --", preselectedServiceId, ServiceDTO::getServiceId));
+
+        viewModel.getCustomerPets().observe(getViewLifecycleOwner(), list ->
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerPet, list, DropdownDTO::getLabel, "-- Select Pet --", preselectedPetId, DropdownDTO::getId));
+
+        viewModel.getStoreEmployees().observe(getViewLifecycleOwner(), list ->
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerStaff, list, DropdownDTO::getLabel, "-- Select Staff --", preselectedStaffId, DropdownDTO::getId));
     }
 
-    /**
-     * Loads the list of pets from the ViewModel.
-     */
-    private void loadPets() {
-        petViewModel.getAllPets(0, 200, null, null, null, null, "petName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                petList = resource.data.getContent();
-                refreshPetSpinner();
-            }
-        });
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
     }
 
-    /**
-     * Populates the pet selection spinner.
-     */
-    private void refreshPetSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerPet, petList,
-                PetDTO::getPetName, "-- Select Pet --",
-                preselectedPetId, PetDTO::getPetId);
+    private void applyViewState(AppointmentDetailViewModel.ViewState state) {
+        isUpdatingUI = true;
+
+        binding.tvApptMode.setText(state.isEditing ? "Edit Appointment" : "Add Appointment");
+        binding.tvAppointmentId.setText(DateTimeUtils.formatId(viewModel.getAppointmentId()));
+        binding.tvAppointmentId.setVisibility(state.isEditing ? View.VISIBLE : View.GONE);
+        binding.btnDeleteAppointment.setVisibility(state.isDeleteVisible ? View.VISIBLE : View.GONE);
+        binding.btnSaveAppointment.setVisibility(state.isSaveVisible ? View.VISIBLE : View.GONE);
+        
+        UIUtils.setFieldEnabled(state.isCustomerEnabled, binding.spinnerCustomer, binding.tvLabelCustomer);
+        UIUtils.setFieldEnabled(state.isStoreEnabled, binding.spinnerStore, binding.tvLabelStore);
+        UIUtils.setFieldEnabled(state.isPetEnabled, binding.spinnerPet, binding.tvLabelPet);
+        UIUtils.setFieldEnabled(state.isServiceEnabled, binding.spinnerService, binding.tvLabelService);
+        UIUtils.setFieldEnabled(state.isStaffEnabled, binding.spinnerStaff, binding.tvLabelStaff);
+        UIUtils.setFieldEnabled(state.isDateEnabled, binding.etAppointmentDate, binding.tvLabelDate);
+        UIUtils.setFieldEnabled(state.isTimeEnabled, binding.spinnerHour, binding.tvLabelTime);
+        UIUtils.setViewsEnabled(state.isTimeEnabled, binding.spinnerMinute);
+        UIUtils.setViewsEnabled(state.isStatusEnabled, binding.spinnerAppointmentStatus);
+
+        Object selected = binding.spinnerAppointmentStatus.getSelectedItem();
+        String current = selected != null ? selected.toString() : "";
+        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerAppointmentStatus, state.availableStatuses);
+        SpinnerUtils.setSelectionByValue(binding.spinnerAppointmentStatus, current);
+
+        isUpdatingUI = false;
     }
 
-    /**
-     * Loads the list of services from the API.
-     */
-    private void loadServices() {
-        serviceViewModel.getAllServices(0, 200, null, "serviceName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                serviceList = resource.data.getContent();
-                refreshServiceSpinner();
-            }
-        });
+    private void notifyDateTimeStatusChange() {
+        if (isUpdatingUI) return;
+
+        String date = binding.etAppointmentDate.getText().toString();
+        String time = buildTimeString();
+        Object selected = binding.spinnerAppointmentStatus.getSelectedItem();
+        String status = selected != null ? selected.toString() : "";
+        viewModel.onDateOrTimeChanged(date, time, status);
     }
 
-    /**
-     * Populates the service selection spinner.
-     */
-    private void refreshServiceSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerService, serviceList,
-                ServiceDTO::getServiceName, "-- Select Service --",
-                preselectedServiceId, ServiceDTO::getServiceId);
-    }
-
-    /**
-     * Loads the list of customers from the API.
-     */
-    private void loadCustomers() {
-        customerViewModel.getAllCustomers(0, 200).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                customerList = resource.data.getContent();
-                refreshCustomerSpinner();
-            }
-        });
-    }
-
-    /**
-     * Populates the customer selection spinner.
-     */
-    private void refreshCustomerSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerCustomer, customerList,
-                item -> item.getFirstName() + " " + item.getLastName(),
-                "-- Select Customer --",
-                preselectedCustomerId, CustomerDTO::getCustomerId);
-    }
-
-    /**
-     * Loads the list of stores from the API.
-     */
-    private void loadStores() {
-        storeViewModel.getAllStores(0, 50).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                refreshStoreSpinner();
-            }
-        });
-    }
-
-    /**
-     * Populates the store selection spinner.
-     */
-    private void refreshStoreSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerStore, storeList,
-                StoreDTO::getStoreName, "-- Select Store --",
-                preselectedStoreId, StoreDTO::getStoreId);
-    }
-
-    /**
-     * Loads the list of staff from the API.
-     */
-    private void loadStaff() {
-        userViewModel.getUsers("STAFF", 0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                staffList = resource.data.getContent();
-                refreshStaffSpinner();
-            }
-        });
-    }
-
-    /**
-     * Populates the staff selection spinner.
-     */
-    private void refreshStaffSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerStaff, staffList,
-                UserDTO::getFullName, "-- Select Staff --",
-                preselectedStaffId, UserDTO::getId);
-    }
-
-    /**
-     * Handles arguments to determine if the fragment is in edit or add mode.
-     */
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.containsKey("appointmentId")) {
-            isEditing = true;
-            appointmentId = a.getLong("appointmentId");
-            binding.tvApptMode.setText("Edit Appointment");
-            binding.tvAppointmentId.setText("ID: " + appointmentId);
-            binding.tvAppointmentId.setVisibility(View.VISIBLE);
-            binding.btnDeleteAppointment.setVisibility(View.VISIBLE);
+            viewModel.setAppointmentId(a.getLong("appointmentId"));
             loadAppointmentData();
         } else {
-            binding.tvApptMode.setText("Add Appointment");
-            binding.btnDeleteAppointment.setVisibility(View.GONE);
-            binding.tvAppointmentId.setVisibility(View.GONE);
+            viewModel.setAppointmentId(-1);
         }
     }
 
-    /**
-     * Fetches specific appointment details from the backend using the ID.
-     */
     private void loadAppointmentData() {
-        appointmentViewModel.getAppointmentById(appointmentId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadAppointment().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 AppointmentDTO a = resource.data;
-                preselectedPetId = (a.getPetId() != null) ? a.getPetId() : -1;
-                preselectedServiceId = (a.getServiceId() != null) ? a.getServiceId() : -1;
-                preselectedCustomerId = (a.getCustomerId() != null) ? a.getCustomerId() : -1;
-                preselectedStoreId = (a.getStoreId() != null) ? a.getStoreId() : -1;
-                preselectedStaffId = (a.getEmployeeId() != null) ? a.getEmployeeId() : -1;
+                preselectedPetId = a.getPetId() != null ? a.getPetId() : -1;
+                preselectedServiceId = a.getServiceId() != null ? a.getServiceId() : -1;
+                preselectedCustomerId = a.getCustomerId() != null ? a.getCustomerId() : -1;
+                preselectedStoreId = a.getStoreId() != null ? a.getStoreId() : -1;
+                preselectedStaffId = a.getEmployeeId() != null ? a.getEmployeeId() : -1;
 
                 binding.etAppointmentDate.setText(a.getAppointmentDate());
-
-                // Pre-fill time spinners
-                String time = a.getAppointmentTime() != null ? a.getAppointmentTime() : "09:00";
-                if (time.length() > 5) time = time.substring(0, 5);
-                String[] parts = time.split(":");
-                if (parts.length == 2) {
-                    try {
-                        int hour = Integer.parseInt(parts[0]);
-                        int min = Integer.parseInt(parts[1]);
-                        for (int i = 0; i < HOURS.length; i++)
-                            if (HOURS[i] == hour) { binding.spinnerHour.setSelection(i); break; }
-                        for (int i = 0; i < MINUTES.length; i++)
-                            if (MINUTES[i] == min) { binding.spinnerMinute.setSelection(i); break; }
-                    } catch (NumberFormatException ignored) {}
-                }
-
-                // Match Title labels with backend values
+                parseAndSetTimeSpinners(a.getAppointmentTime() != null ? a.getAppointmentTime() : "09:00");
+                
                 String status = a.getAppointmentStatus();
                 if (status != null && !status.isEmpty()) {
-                    String formattedStatus = status.substring(0, 1).toUpperCase() + status.substring(1).toLowerCase();
-                    SpinnerUtils.setSelectionByValue(binding.spinnerAppointmentStatus, formattedStatus);
+                    SpinnerUtils.setSelectionByValue(binding.spinnerAppointmentStatus, DateTimeUtils.formatStatusFromBackend(status));
                 }
-
-                refreshPetSpinner();
-                refreshServiceSpinner();
-                refreshCustomerSpinner();
-                refreshStoreSpinner();
-                refreshStaffSpinner();
-            } else if (resource.status == Resource.Status.ERROR) {
-                Toast.makeText(getContext(), "Failed to load appointment: " + resource.message, Toast.LENGTH_SHORT).show();
+                notifyDateTimeStatusChange();
             }
         });
     }
 
-    /**
-     * Validates input and saves the appointment to the backend.
-     */
     private void saveAppointment() {
-        if (binding.spinnerCustomer.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a customer", Toast.LENGTH_SHORT).show(); return;
-        }
-        if (binding.spinnerStore.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a store", Toast.LENGTH_SHORT).show(); return;
-        }
-        if (binding.spinnerPet.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a pet", Toast.LENGTH_SHORT).show(); return;
-        }
-        if (binding.spinnerService.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a service", Toast.LENGTH_SHORT).show(); return;
-        }
+        if (!validateRequiredFields()) return;
+
         String date = binding.etAppointmentDate.getText().toString().trim();
-        if (date.isEmpty()) {
-            Toast.makeText(getContext(), "Select a date", Toast.LENGTH_SHORT).show(); return;
-        }
-
-        CustomerDTO customer = customerList.get(binding.spinnerCustomer.getSelectedItemPosition() - 1);
-        StoreDTO store       = storeList.get(binding.spinnerStore.getSelectedItemPosition() - 1);
-        PetDTO pet           = petList.get(binding.spinnerPet.getSelectedItemPosition() - 1);
-        ServiceDTO service   = serviceList.get(binding.spinnerService.getSelectedItemPosition() - 1);
-        
-        Long employeeId = null;
-        if (binding.spinnerStaff.getSelectedItemPosition() > 0) {
-            employeeId = staffList.get(binding.spinnerStaff.getSelectedItemPosition() - 1).getId();
-        }
-
-        String time = String.format("%02d:%02d",
-                HOURS[binding.spinnerHour.getSelectedItemPosition()],
-                MINUTES[binding.spinnerMinute.getSelectedItemPosition()]);
-        
-        // Get status and convert to uppercase for backend
+        String time = buildTimeString();
         String status = binding.spinnerAppointmentStatus.getSelectedItem().toString().toUpperCase();
 
-
-        // Validate future date+time if status is BOOKED
-        if ("BOOKED".equalsIgnoreCase(status)) {
-            try {
-                String[] dateParts = date.split("-");
-                String[] timeParts = time.split(":");
-                Calendar selected = Calendar.getInstance();
-                selected.set(
-                        Integer.parseInt(dateParts[0]),
-                        Integer.parseInt(dateParts[1]) - 1,
-                        Integer.parseInt(dateParts[2]),
-                        Integer.parseInt(timeParts[0]),
-                        Integer.parseInt(timeParts[1]),
-                        0
-                );
-                if (selected.before(Calendar.getInstance())) {
-                    DialogUtils.showInfoDialog(requireContext(), "Invalid Time",
-                            "Booked appointments must be in the future. " +
-                                    "Please select a future date and time.");
-                    return;
-                }
-            } catch (Exception e) {
-                Log.e("APPT_SAVE", "Date parse error: " + e.getMessage());
-            }
+        if (!viewModel.isValidFutureBooking(status, date, time)) {
+            DialogUtils.showInfoDialog(requireContext(), "Invalid Time", "Booked appointments must be in the future.");
+            return;
         }
 
-        // Build DTO with all required IDs
-        AppointmentDTO dto = new AppointmentDTO(
-                customer.getCustomerId(),
-                store.getStoreId(),
-                service.getServiceId(),
-                employeeId,
-                date,
-                time,
-                status,
-                pet.getPetId()
-        );
-
-        androidx.lifecycle.Observer<Resource<AppointmentDTO>> observer = resource -> {
+        viewModel.saveAppointment(date, time, status).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS) {
-                Toast.makeText(getContext(), isEditing ? "Updated" : "Saved", Toast.LENGTH_SHORT).show();
+                AppointmentDetailViewModel.ViewState state = viewModel.getViewState().getValue();
+                String message = (state != null && state.isEditing) ? "Updated" : "Saved";
+                Toast.makeText(getContext(), message, Toast.LENGTH_SHORT).show();
                 navigateBack();
             } else if (resource.status == Resource.Status.ERROR) {
                 handleSaveError(resource.message);
             }
-        };
-
-        if (isEditing) {
-            appointmentViewModel.updateAppointment(appointmentId, dto).observe(getViewLifecycleOwner(), observer);
-        } else {
-            appointmentViewModel.createAppointment(dto).observe(getViewLifecycleOwner(), observer);
-        }
+        });
+    }
+
+    private boolean validateRequiredFields() {
+        if (!InputValidator.isSpinnerSelected(binding.spinnerCustomer, "Customer")) return false;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerStore, "Store")) return false;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerPet, "Pet")) return false;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerService, "Service")) return false;
+        if (!InputValidator.isNotEmpty(binding.etAppointmentDate, "Appointment Date")) return false;
+        return true;
+    }
+
+    private String buildTimeString() {
+        return DateTimeUtils.formatTime(HOURS[binding.spinnerHour.getSelectedItemPosition()], MINUTES[binding.spinnerMinute.getSelectedItemPosition()]);
     }
 
-    /**
-     * Handles errors that occur during the saving process.
-     */
     private void handleSaveError(String errorMessage) {
-        if (errorMessage != null) {
-            Log.e("APPT_SAVE", "Error: " + errorMessage);
-            if (errorMessage.toLowerCase().contains("future")) {
-                DialogUtils.showInfoDialog(requireContext(), "Invalid Date/Time",
-                        "Booked appointments must be scheduled in the future.");
-            } else if (errorMessage.toLowerCase().contains("not available")) {
-                showNoAvailabilityDialog();
-            } else {
-                Toast.makeText(getContext(), errorMessage, Toast.LENGTH_SHORT).show();
-            }
-        } else {
-            Toast.makeText(getContext(), "Something went wrong", Toast.LENGTH_SHORT).show();
-        }
+        if (errorMessage != null && errorMessage.toLowerCase().contains("not available")) showNoAvailabilityDialog();
+        else Toast.makeText(getContext(), errorMessage != null ? errorMessage : "Error saving", Toast.LENGTH_SHORT).show();
     }
 
-    /**
-     * Shows a specialized dialog when a time slot is not available.
-     */
     private void showNoAvailabilityDialog() {
         new androidx.appcompat.app.AlertDialog.Builder(requireContext())
                 .setTitle("No Availability")
-                .setMessage("This time slot is already booked. Please choose a different time or date.")
+                .setMessage("This time slot is already booked.")
                 .setPositiveButton("Change Time", (d, w) -> d.dismiss())
-                .setNegativeButton("Cancel Booking", (d, w) -> navigateBack())
-                .setCancelable(false)
-                .show();
+                .setNegativeButton("Cancel Booking", (d, w) -> navigateBack()).show();
     }
 
-    /**
-     * Shows a confirmation dialog and handles the deletion of an appointment.
-     */
     private void confirmDelete() {
         DialogUtils.showDeleteConfirmDialog(requireContext(), "Appointment", () ->
-                appointmentViewModel.deleteAppointment(appointmentId).observe(getViewLifecycleOwner(), resource -> {
-                    if (resource.status == Resource.Status.SUCCESS) {
-                        Toast.makeText(getContext(), "Deleted", Toast.LENGTH_SHORT).show();
-                        navigateBack();
-                    } else if (resource.status == Resource.Status.ERROR) {
-                        Toast.makeText(getContext(), "Delete failed", Toast.LENGTH_SHORT).show();
-                    }
+                viewModel.deleteAppointment().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
+                    if (resource.status == Resource.Status.SUCCESS) navigateBack();
                 }));
     }
 
-    /**
-     * Navigates back to the previous screen.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }
+
+    private void parseAndSetTimeSpinners(String time) {
+        int[] parsedTime = DateTimeUtils.parseTimeString(time);
+        if (parsedTime == null) return;
+        SpinnerUtils.setSelectionByValueArray(binding.spinnerHour, HOURS, parsedTime[0]);
+        SpinnerUtils.setSelectionByValueArray(binding.spinnerMinute, MINUTES, parsedTime[1]);
+    }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/InventoryDetailFragment.java

@@ -8,24 +8,20 @@ import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 
 import com.example.petstoremobile.databinding.FragmentInventoryDetailBinding;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.InventoryDTO;
 import com.example.petstoremobile.dtos.ProductDTO;
-import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
-import com.example.petstoremobile.viewmodels.InventoryViewModel;
-import com.example.petstoremobile.viewmodels.ProductViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
-
-import java.util.ArrayList;
-import java.util.List;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.InventoryDetailViewModel;
 
 import dagger.hilt.android.AndroidEntryPoint;
 
@@ -36,33 +32,17 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class InventoryDetailFragment extends Fragment {
 
     private FragmentInventoryDetailBinding binding;
+    private InventoryDetailViewModel viewModel;
 
-    private InventoryViewModel inventoryViewModel;
-    private ProductViewModel productViewModel;
-    private StoreViewModel storeViewModel;
-
-    private boolean isEditing = false;
-    private long inventoryId = -1;
     private long preselectedStoreId = -1;
     private long preselectedProductId = -1;
 
-    private List<StoreDTO> storeList = new ArrayList<>();
-    private List<ProductDTO> productList = new ArrayList<>();
-
-    /**
-     * Initializes the view models.
-     */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        inventoryViewModel = new ViewModelProvider(this).get(InventoryViewModel.class);
-        productViewModel = new ViewModelProvider(this).get(ProductViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(InventoryDetailViewModel.class);
     }
 
-    /**
-     * Inflates the layout.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -70,13 +50,11 @@ public class InventoryDetailFragment extends Fragment {
         return binding.getRoot();
     }
 
-    /**
-     * Sets up UI components after the view is created.
-     */
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
 
+        observeViewModel();
         loadSpinnersData();
         handleArguments();
 
@@ -85,64 +63,57 @@ public class InventoryDetailFragment extends Fragment {
         binding.btnDeleteInventory.setOnClickListener(v -> confirmDelete());
     }
 
+    private void observeViewModel() {
+        viewModel.getStoreList().observe(getViewLifecycleOwner(), list -> refreshStoreSpinner());
+        viewModel.getProductList().observe(getViewLifecycleOwner(), list -> refreshProductSpinner());
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Fetches required data for spinners from the backend.
-     */
     private void loadSpinnersData() {
-        loadStores();
-        loadProducts();
-    }
-
-    /**
-     * Loads the list of stores for the spinner.
-     */
-    private void loadStores() {
-        storeViewModel.getAllStores(0, 100).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadStores().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                refreshStoreSpinner();
+                viewModel.setStoreList(resource.data);
+            }
+        });
+        viewModel.loadProducts().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setProductList(resource.data.getContent());
             }
         });
     }
 
     private void refreshStoreSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerInventoryStore, storeList,
-                StoreDTO::getStoreName, "-- Select Store --",
-                preselectedStoreId, StoreDTO::getStoreId);
-    }
-
-    /**
-     * Loads the list of products for the spinner.
-     */
-    private void loadProducts() {
-        productViewModel.getAllProducts(null, null, 0, 500, "prodName").observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                productList = resource.data.getContent();
-                refreshProductSpinner();
-            }
-        });
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerInventoryStore, viewModel.getStoreList().getValue(),
+                DropdownDTO::getLabel, "-- Select Store --",
+                preselectedStoreId, DropdownDTO::getId);
     }
 
     private void refreshProductSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerInventoryProduct, productList,
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerInventoryProduct, viewModel.getProductList().getValue(),
                 ProductDTO::getProdName, "-- Select Product --",
                 preselectedProductId, ProductDTO::getProdId);
     }
 
-    /**
-     * Handles fragment arguments to determine if we are in edit or add mode.
-     */
     private void handleArguments() {
         Bundle args = getArguments();
         if (args != null && args.containsKey("inventoryId")) {
-            isEditing = true;
-            inventoryId = args.getLong("inventoryId");
+            long inventoryId = args.getLong("inventoryId");
+            viewModel.setInventoryId(inventoryId);
 
             binding.tvInventoryMode.setText("Edit Inventory");
             binding.tvInventoryId.setText("Inventory ID: " + inventoryId);
@@ -152,7 +123,7 @@ public class InventoryDetailFragment extends Fragment {
 
             loadInventoryData();
         } else {
-            isEditing = false;
+            viewModel.setInventoryId(-1);
             binding.tvInventoryMode.setText("Add Inventory");
             binding.tvInventoryId.setVisibility(View.GONE);
             binding.btnDeleteInventory.setVisibility(View.GONE);
@@ -160,12 +131,10 @@ public class InventoryDetailFragment extends Fragment {
         }
     }
 
-    /**
-     * Loads existing inventory data from the backend.
-     */
     private void loadInventoryData() {
-        inventoryViewModel.getInventoryById(inventoryId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadInventory().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 InventoryDTO inv = resource.data;
                 binding.etQuantity.setText(String.valueOf(inv.getQuantity()));
@@ -180,95 +149,59 @@ public class InventoryDetailFragment extends Fragment {
         });
     }
 
-    /**
-     * Validates input and saves the current inventory item details to the backend.
-     */
     private void saveInventory() {
-        if (binding.spinnerInventoryStore.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Please select a store", Toast.LENGTH_SHORT).show();
-            return;
-        }
-        if (binding.spinnerInventoryProduct.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Please select a product", Toast.LENGTH_SHORT).show();
-            return;
-        }
-
-        if (!InputValidator.isNotEmpty(binding.etQuantity, "Quantity") ||
-            !InputValidator.isPositiveInteger(binding.etQuantity, "Quantity")) {
-            return;
-        }
+        if (!InputValidator.isSpinnerSelected(binding.spinnerInventoryStore, "Store")) return;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerInventoryProduct, "Product")) return;
+        if (!InputValidator.isPositiveInteger(binding.etQuantity, "Quantity")) return;
 
         int quantity = Integer.parseInt(binding.etQuantity.getText().toString().trim());
-        StoreDTO store = storeList.get(binding.spinnerInventoryStore.getSelectedItemPosition() - 1);
-        ProductDTO product = productList.get(binding.spinnerInventoryProduct.getSelectedItemPosition() - 1);
+        DropdownDTO store = viewModel.getStoreList().getValue().get(binding.spinnerInventoryStore.getSelectedItemPosition() - 1);
+        ProductDTO product = viewModel.getProductList().getValue().get(binding.spinnerInventoryProduct.getSelectedItemPosition() - 1);
 
-        InventoryDTO request = new InventoryDTO(product.getProdId(), store.getStoreId(), quantity);
+        InventoryDTO request = new InventoryDTO(product.getProdId(), store.getId(), quantity);
         setButtonsEnabled(false);
 
-        if (isEditing) {
-            inventoryViewModel.updateInventory(inventoryId, request).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.saveInventory(request).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status != Resource.Status.LOADING) {
                 setButtonsEnabled(true);
                 if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Inventory updated", Toast.LENGTH_SHORT).show();
+                    Toast.makeText(getContext(), viewModel.isEditing() ? "Inventory updated" : "Inventory created", Toast.LENGTH_SHORT).show();
                     navigateBack();
                 } else if (resource.status == Resource.Status.ERROR) {
                     Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
                 }
-            });
-        } else {
-            inventoryViewModel.createInventory(request).observe(getViewLifecycleOwner(), resource -> {
-                setButtonsEnabled(true);
-                if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Inventory created", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        }
-    }
-
-    /**
-     * Shows a confirmation dialog before deleting an inventory item.
-     */
-    private void confirmDelete() {
-        new AlertDialog.Builder(requireContext())
-                .setTitle("Delete inventory item?")
-                .setMessage("This cannot be undone.")
-                .setPositiveButton("Delete", (d, w) -> deleteInventory())
-                .setNegativeButton("Cancel", null)
-                .show();
-    }
-
-    /**
-     * Sends a request to the API to delete the inventory item.
-     */
-    private void deleteInventory() {
-        setButtonsEnabled(false);
-        inventoryViewModel.deleteInventory(inventoryId).observe(getViewLifecycleOwner(), resource -> {
-            setButtonsEnabled(true);
-            if (resource.status == Resource.Status.SUCCESS) {
-                Toast.makeText(getContext(), "Inventory deleted", Toast.LENGTH_SHORT).show();
-                navigateBack();
-            } else if (resource.status == Resource.Status.ERROR) {
-                Toast.makeText(getContext(), "Delete failed: " + resource.message, Toast.LENGTH_SHORT).show();
             }
         });
     }
 
-    /**
-     * Navigates back to the previous fragment.
-     */
+    private void confirmDelete() {
+        DialogUtils.showDeleteConfirmDialog(requireContext(), "Inventory Item", this::deleteInventory);
+    }
+
+    private void deleteInventory() {
+        setButtonsEnabled(false);
+        viewModel.deleteInventory().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status != Resource.Status.LOADING) {
+                setButtonsEnabled(true);
+                if (resource.status == Resource.Status.SUCCESS) {
+                    Toast.makeText(getContext(), "Inventory deleted", Toast.LENGTH_SHORT).show();
+                    navigateBack();
+                } else if (resource.status == Resource.Status.ERROR) {
+                    Toast.makeText(getContext(), "Delete failed: " + resource.message, Toast.LENGTH_SHORT).show();
+                }
+            }
+        });
+    }
+
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }
 
-    /**
-     * Enables or disables action buttons.
-     */
     private void setButtonsEnabled(boolean enabled) {
-        binding.btnSaveInventory.setEnabled(enabled);
-        binding.btnDeleteInventory.setEnabled(enabled);
-        binding.btnInventoryBack.setEnabled(enabled);
+        UIUtils.setViewsEnabled(enabled, binding.btnSaveInventory, binding.btnDeleteInventory, binding.btnInventoryBack);
     }
 }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/PetDetailFragment.java

@@ -18,20 +18,17 @@ import android.widget.Toast;
 
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.databinding.FragmentPetDetailBinding;
-import com.example.petstoremobile.dtos.CustomerDTO;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PetDTO;
-import com.example.petstoremobile.dtos.StoreDTO;
 import com.example.petstoremobile.utils.ActivityLogger;
+import com.example.petstoremobile.utils.DateTimeUtils;
 import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
-import com.example.petstoremobile.viewmodels.CustomerViewModel;
-import com.example.petstoremobile.viewmodels.PetViewModel;
-import com.example.petstoremobile.viewmodels.StoreViewModel;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.PetDetailViewModel;
 
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Locale;
 
 import dagger.hilt.android.AndroidEntryPoint;
@@ -43,23 +40,15 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class PetDetailFragment extends Fragment {
 
     private FragmentPetDetailBinding binding;
-    private long petId;
-    private boolean isEditing = false;
-
-    private PetViewModel viewModel;
-    private CustomerViewModel customerViewModel;
-    private StoreViewModel storeViewModel;
-    private List<CustomerDTO> customerList = new ArrayList<>();
-    private List<StoreDTO> storeList = new ArrayList<>();
+    private PetDetailViewModel viewModel;
+    
     private Long selectedCustomerId = null;
     private Long selectedStoreId = null;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(PetViewModel.class);
-        customerViewModel = new ViewModelProvider(this).get(CustomerViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
+        viewModel = new ViewModelProvider(this).get(PetDetailViewModel.class);
     }
 
     @Override
@@ -74,34 +63,54 @@ public class PetDetailFragment extends Fragment {
         super.onViewCreated(view, savedInstanceState);
 
         setupSpinner();
-        loadCustomers();
-        loadStores();
+        observeViewModel();
         handleArguments();
 
-        //set button click listeners
         binding.btnBack.setOnClickListener(v -> navigateBack());
         binding.btnSavePet.setOnClickListener(v -> savePet());
         binding.btnDeletePet.setOnClickListener(v -> deletePet());
     }
 
+    private void observeViewModel() {
+        viewModel.getCustomerList().observe(getViewLifecycleOwner(), list -> updateCustomerSpinnerSelection());
+        viewModel.getStoreList().observe(getViewLifecycleOwner(), list -> updateStoreSpinnerSelection());
+        
+        viewModel.loadCustomers().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setCustomerList(resource.data);
+            }
+        });
+
+        viewModel.loadStores().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setStoreList(resource.data);
+            }
+        });
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Handles the saving of pet data (adding/updating).
-     */
     private void savePet() {
-        // Validates all fields using InputValidator
         if (!InputValidator.isNotEmpty(binding.etPetName, "Pet Name")) return;
         if (!InputValidator.isNotEmpty(binding.etPetSpecies, "Species")) return;
         if (!InputValidator.isNotEmpty(binding.etPetBreed, "Breed")) return;
         if (!InputValidator.isPositiveInteger(binding.etPetAge, "Age")) return;
         if (!InputValidator.isPositiveDecimal(binding.etPetPrice, "Price")) return;
 
-        //get all the values from the fields
         String name = binding.etPetName.getText().toString().trim();
         String species = binding.etPetSpecies.getText().toString().trim();
         String breed = binding.etPetBreed.getText().toString().trim();
@@ -109,37 +118,27 @@ public class PetDetailFragment extends Fragment {
         double price = Double.parseDouble(binding.etPetPrice.getText().toString().trim());
         String status = binding.spinnerPetStatus.getSelectedItem().toString();
 
-        // Get selected customer
         Long customerId = null;
-        int customerPos = binding.spinnerCustomer.getSelectedItemPosition();
-        if (customerPos > 0) { // 0 means no customer for pet
-            customerId = customerList.get(customerPos - 1).getCustomerId();
+        if (binding.spinnerCustomer.getSelectedItemPosition() > 0) {
+            customerId = viewModel.getCustomerList().getValue().get(binding.spinnerCustomer.getSelectedItemPosition() - 1).getId();
         }
 
-        // Get selected store
         Long storeId = null;
-        int storePos = binding.spinnerStore.getSelectedItemPosition();
-        if (storePos > 0) {
-            storeId = storeList.get(storePos - 1).getStoreId();
+        if (binding.spinnerStore.getSelectedItemPosition() > 0) {
+            storeId = viewModel.getStoreList().getValue().get(binding.spinnerStore.getSelectedItemPosition() - 1).getId();
         }
 
-        // Validation: If status is Available, a store must be selected
         if ("Available".equalsIgnoreCase(status)) {
             if (!InputValidator.isSpinnerSelected(binding.spinnerStore, "Store")) return;
         }
-
-        // Validation: If status is Owned, an owner must be selected
         if ("Owned".equalsIgnoreCase(status)) {
             if (!InputValidator.isSpinnerSelected(binding.spinnerCustomer, "Owner")) return;
         }
-
-        // Validation: If status is Adopted, an owner and store must be selected
         if ("Adopted".equalsIgnoreCase(status)) {
             if (!InputValidator.isSpinnerSelected(binding.spinnerCustomer, "Owner")) return;
             if (!InputValidator.isSpinnerSelected(binding.spinnerStore, "Store")) return;
         }
 
-        //create a pet object to send to the API
         PetDTO petDTO = new PetDTO();
         petDTO.setPetName(name);
         petDTO.setPetSpecies(species);
@@ -150,107 +149,74 @@ public class PetDetailFragment extends Fragment {
         petDTO.setCustomerId(customerId);
         petDTO.setStoreId(storeId);
 
-        //check if the pet is being edited or added
-        if (isEditing) {
-            // Update existing pet
-            petDTO.setPetId(petId);
-            viewModel.updatePet(petId, petDTO).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    ActivityLogger.logChange(requireContext(), "Pet", "UPDATED", (int) petId);
+        viewModel.savePet(petDTO).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS) {
+                if (viewModel.isEditing()) {
+                    ActivityLogger.logChange(requireContext(), "Pet", "UPDATED", (int) viewModel.getPetId());
                     Toast.makeText(getContext(), "Pet updated successfully!", Toast.LENGTH_SHORT).show();
-                    navigateToPetList();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        } else {
-            // Add new pet
-            viewModel.createPet(petDTO).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
+                } else {
                     ActivityLogger.log(requireContext(), "Added new Pet: " + name);
                     Toast.makeText(getContext(), "Pet added successfully!", Toast.LENGTH_SHORT).show();
-                    navigateToPetList();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
                 }
-            });
-        }
+                navigateToPetList();
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
+            }
+        });
     }
 
-    /**
-     * Displays a confirmation dialog and handles the deletion of a pet.
-     */
     private void deletePet() {
-        DialogUtils.showDeleteConfirmDialog(requireContext(), "Pet", () -> 
-                viewModel.deletePet(petId).observe(getViewLifecycleOwner(), resource -> {
+        DialogUtils.showDeleteConfirmDialog(requireContext(), "Pet", () -> {
+                viewModel.deletePet().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
                     if (resource.status == Resource.Status.SUCCESS) {
-                        ActivityLogger.logChange(requireContext(), "Pet", "DELETED", (int) petId);
+                        ActivityLogger.logChange(requireContext(), "Pet", "DELETED", (int) viewModel.getPetId());
                         Toast.makeText(getContext(), "Pet deleted successfully!", Toast.LENGTH_SHORT).show();
                         navigateToPetList();
                     } else if (resource.status == Resource.Status.ERROR) {
                         Toast.makeText(getContext(), "Delete failed: " + resource.message, Toast.LENGTH_SHORT).show();
                     }
-                }));
+                });
+        });
     }
 
-    /**
-     * Navigates back to the pet list screen.
-     */
     private void navigateToPetList() {
         NavHostFragment.findNavController(this).popBackStack(R.id.nav_pet, false);
     }
 
-    /**
-     * Navigates back to the previous screen.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }
 
-    /**
-     * Handles arguments passed to the fragment to determine if it's in edit or add mode.
-     */
     private void handleArguments() {
-        // Pet is being edited if the bundle contains a petId
         if (getArguments() != null && getArguments().containsKey("petId")) {
-            // Get pet data from arguments and populate fields
-            isEditing = true;
-            petId = getArguments().getLong("petId");
+            long petId = getArguments().getLong("petId");
+            viewModel.setPetId(petId);
             binding.tvMode.setText("Edit Pet");
-            binding.tvPetId.setText("ID: " + petId);
+            binding.tvPetId.setText(DateTimeUtils.formatId(petId));
             binding.tvPetId.setVisibility(View.VISIBLE);
             binding.btnDeletePet.setVisibility(View.VISIBLE);
             
-            // Disable species and breed fields in edit mode
-            binding.etPetSpecies.setEnabled(false);
-            binding.etPetBreed.setEnabled(false);
-            binding.etPetSpecies.setAlpha(0.5f);
-            binding.etPetBreed.setAlpha(0.5f);
-            
+            UIUtils.setViewsEnabled(false, binding.etPetSpecies, binding.etPetBreed);
             loadPetData();
         } else {
-            // Pet is being added
-            // Set default values for add a new pet
-            isEditing = false;
+            viewModel.setPetId(-1);
             binding.tvMode.setText("Add Pet");
             binding.tvPetId.setVisibility(View.GONE);
             binding.btnDeletePet.setVisibility(View.GONE);
             binding.btnSavePet.setText("Add");
             
-            // Enable species and breed fields in edit mode
-            binding.etPetSpecies.setEnabled(true);
-            binding.etPetBreed.setEnabled(true);
-            binding.etPetSpecies.setAlpha(1.0f);
-            binding.etPetBreed.setAlpha(1.0f);
+            UIUtils.setViewsEnabled(true, binding.etPetSpecies, binding.etPetBreed);
         }
     }
 
-    /**
-     * Fetches specific pet details from the backend using the ID.
-     */
     private void loadPetData() {
-        viewModel.getPetById(petId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadPet().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 PetDTO p = resource.data;
                 binding.etPetName.setText(p.getPetName());
@@ -273,63 +239,30 @@ public class PetDetailFragment extends Fragment {
         });
     }
 
-    /**
-     * Fetches the list of customers and populates the spinner.
-     */
-    private void loadCustomers() {
-        customerViewModel.getAllCustomers(0, 1000).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                customerList = resource.data.getContent();
-                updateCustomerSpinnerSelection();
-            }
-        });
-    }
-
-    /**
-     * Fetches the list of stores and populates the spinner.
-     */
-    private void loadStores() {
-        storeViewModel.getAllStores(0, 1000).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                updateStoreSpinnerSelection();
-            }
-        });
-    }
-
-    /**
-     * Updates the customer spinner with the current list and sets the selection if needed.
-     */
     private void updateCustomerSpinnerSelection() {
         SpinnerUtils.populateSpinner(
                 requireContext(),
                 binding.spinnerCustomer,
-                customerList,
-                CustomerDTO::getFullName,
+                viewModel.getCustomerList().getValue(),
+                DropdownDTO::getLabel,
                 "No Owner",
                 selectedCustomerId,
-                CustomerDTO::getCustomerId
+                DropdownDTO::getId
         );
     }
 
-    /**
-     * Updates the store spinner with the current list and sets the selection if needed.
-     */
     private void updateStoreSpinnerSelection() {
         SpinnerUtils.populateSpinner(
                 requireContext(),
                 binding.spinnerStore,
-                storeList,
-                StoreDTO::getStoreName,
+                viewModel.getStoreList().getValue(),
+                DropdownDTO::getLabel,
                 "None",
                 selectedStoreId,
-                StoreDTO::getStoreId
+                DropdownDTO::getId
         );
     }
 
-    /**
-     * Initializes the spinner for pet status selection.
-     */
     private void setupSpinner() {
         SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerPetStatus,
                 new String[]{"Available", "Adopted", "Owned"});
@@ -339,28 +272,21 @@ public class PetDetailFragment extends Fragment {
             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                 String status = parent.getItemAtPosition(position).toString();
 
-                // Clear any existing error icons when status changes
                 clearSpinnerError(binding.spinnerCustomer);
                 clearSpinnerError(binding.spinnerStore);
 
-                //Disable the customer spinner if the status is "Available"
                 if ("Available".equalsIgnoreCase(status)) {
                     binding.spinnerCustomer.setSelection(0);
-                    binding.spinnerCustomer.setEnabled(false);
-                    binding.spinnerCustomer.setAlpha(0.5f);
+                    UIUtils.setViewsEnabled(false, binding.spinnerCustomer);
                 } else {
-                    binding.spinnerCustomer.setEnabled(true);
-                    binding.spinnerCustomer.setAlpha(1.0f);
+                    UIUtils.setViewsEnabled(true, binding.spinnerCustomer);
                 }
 
-                //Disable the store spinner if the status is "Owned"
                 if ("Owned".equalsIgnoreCase(status)) {
                     binding.spinnerStore.setSelection(0);
-                    binding.spinnerStore.setEnabled(false);
-                    binding.spinnerStore.setAlpha(0.5f);
+                    UIUtils.setViewsEnabled(false, binding.spinnerStore);
                 } else {
-                    binding.spinnerStore.setEnabled(true);
-                    binding.spinnerStore.setAlpha(1.0f);
+                    UIUtils.setViewsEnabled(true, binding.spinnerStore);
                 }
             }
 
@@ -370,9 +296,6 @@ public class PetDetailFragment extends Fragment {
         });
     }
 
-    /**
-     * Clears error messages from a Spinner's selected view.
-     */
     private void clearSpinnerError(Spinner spinner) {
         View selectedView = spinner.getSelectedView();
         if (selectedView instanceof TextView) {

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/ProductDetailFragment.java

@@ -17,7 +17,8 @@ import com.example.petstoremobile.api.*;
 import com.example.petstoremobile.api.auth.TokenManager;
 import com.example.petstoremobile.databinding.FragmentProductDetailBinding;
 import com.example.petstoremobile.dtos.*;
-import com.example.petstoremobile.viewmodels.ProductViewModel;
+import com.example.petstoremobile.viewmodels.ProductDetailViewModel;
+import com.example.petstoremobile.utils.DateTimeUtils;
 import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.FileUtils;
 import com.example.petstoremobile.utils.GlideUtils;
@@ -31,7 +32,6 @@ import java.math.BigDecimal;
 import java.util.*;
 
 import javax.inject.Inject;
-
 import javax.inject.Named;
 
 import dagger.hilt.android.AndroidEntryPoint;
@@ -46,29 +46,22 @@ import okhttp3.RequestBody;
 public class ProductDetailFragment extends Fragment {
 
     private FragmentProductDetailBinding binding;
+    private ProductDetailViewModel viewModel;
+    private ImagePickerHelper imagePickerHelper;
 
-    private long prodId = -1;
-    private boolean isEditing = false;
     private long preselectedCategoryId = -1;
     private boolean hasImage = false;
     private boolean isImageChanged = false;
     private boolean isImageRemoved = false;
-
-    private List<CategoryDTO> categoryList = new ArrayList<>();
     private Uri photoUri;
-    private ProductViewModel viewModel;
-    private ImagePickerHelper imagePickerHelper;
 
     @Inject @Named("baseUrl") String baseUrl;
     @Inject TokenManager tokenManager;
 
-    /**
-     * Initializes activity launchers and the ImagePickerHelper.
-     */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(ProductViewModel.class);
+        viewModel = new ViewModelProvider(this).get(ProductDetailViewModel.class);
 
         imagePickerHelper = new ImagePickerHelper(this, "product_photo.jpg", new ImagePickerHelper.ImagePickerListener() {
             @Override
@@ -95,9 +88,6 @@ public class ProductDetailFragment extends Fragment {
         });
     }
 
-    /**
-     * Inflates the layout.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -105,14 +95,11 @@ public class ProductDetailFragment extends Fragment {
         return binding.getRoot();
     }
 
-    /**
-     * Sets up UI components and listeners after the view is created.
-     */
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
 
-        loadCategories();
+        observeViewModel();
         handleArguments();
 
         binding.btnProductBack.setOnClickListener(v -> navigateBack());
@@ -121,41 +108,49 @@ public class ProductDetailFragment extends Fragment {
         binding.ivProductImage.setOnClickListener(v -> imagePickerHelper.showImagePickerDialog("Select Product Image", hasImage));
     }
 
+    private void observeViewModel() {
+        viewModel.getCategoryList().observe(getViewLifecycleOwner(), list -> updateCategorySpinner());
+        
+        viewModel.loadCategories().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setCategoryList(resource.data.getContent());
+            }
+        });
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
+    private void updateCategorySpinner() {
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerProductCategory, viewModel.getCategoryList().getValue(),
+                CategoryDTO::getCategoryName, "-- Select Category --",
+                preselectedCategoryId, CategoryDTO::getCategoryId);
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Fetches all product categories for the selection spinner.
-     */
-    private void loadCategories() {
-        viewModel.getAllCategories(0, 100).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                categoryList = resource.data.getContent();
-                SpinnerUtils.populateSpinner(requireContext(), binding.spinnerProductCategory, categoryList,
-                        CategoryDTO::getCategoryName, "-- Select Category --",
-                        preselectedCategoryId, CategoryDTO::getCategoryId);
-            }
-        });
-    }
-
-    /**
-     * Checks if the fragment was opened with existing product data for editing.
-     */
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.containsKey("prodId")) {
-            isEditing = true;
-            prodId = a.getLong("prodId");
+            long prodId = a.getLong("prodId");
+            viewModel.setProdId(prodId);
             binding.tvProductMode.setText("Edit Product");
-            binding.tvProductId.setText("ID: " + prodId);
+            binding.tvProductId.setText(DateTimeUtils.formatId(prodId));
             binding.tvProductId.setVisibility(View.VISIBLE);
             binding.btnDeleteProduct.setVisibility(View.VISIBLE);
             loadProductData();
             loadProductImage();
         } else {
+            viewModel.setProdId(-1);
             binding.tvProductMode.setText("Add Product");
             binding.btnDeleteProduct.setVisibility(View.GONE);
             binding.tvProductId.setVisibility(View.GONE);
@@ -163,36 +158,25 @@ public class ProductDetailFragment extends Fragment {
         }
     }
 
-    /**
-     * Loads the product data from the backend.
-     */
     private void loadProductData() {
-        viewModel.getProductById(prodId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadProduct().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 ProductDTO p = resource.data;
                 binding.etProductName.setText(p.getProdName());
                 binding.etProductDesc.setText(p.getProdDesc());
                 binding.etProductPrice.setText(p.getProdPrice() != null ? p.getProdPrice().toString() : "");
                 preselectedCategoryId = p.getCategoryId() != null ? p.getCategoryId() : -1;
-                
-                // Refresh spinner selection once data is loaded
-                if (!categoryList.isEmpty()) {
-                    SpinnerUtils.populateSpinner(requireContext(), binding.spinnerProductCategory, categoryList,
-                            CategoryDTO::getCategoryName, "-- Select Category --",
-                            preselectedCategoryId, CategoryDTO::getCategoryId);
-                }
+                updateCategorySpinner();
             } else if (resource.status == Resource.Status.ERROR) {
                 Toast.makeText(getContext(), "Failed to load product: " + resource.message, Toast.LENGTH_SHORT).show();
             }
         });
     }
 
-    /**
-     * Loads the product image from the backend.
-     */
     private void loadProductImage() {
-        String imageUrl = baseUrl + String.format(Locale.US, ProductApi.PRODUCT_IMAGE_PATH, prodId);
+        String imageUrl = baseUrl + String.format(Locale.US, ProductApi.PRODUCT_IMAGE_PATH, viewModel.getProdId());
         String token = tokenManager.getToken();
 
         GlideUtils.loadImageWithToken(requireContext(), binding.ivProductImage, imageUrl, token, R.drawable.placeholder2, new GlideUtils.ImageLoadListener() {
@@ -208,13 +192,12 @@ public class ProductDetailFragment extends Fragment {
         });
     }
 
-    /**
-     * Performs image related actions (upload/delete) after product details are saved.
-     */
     private void performPendingImageActions(String successMsg) {
         if (isImageRemoved) {
-            viewModel.deleteProductImage(prodId).observe(getViewLifecycleOwner(), resource -> {
-                if (resource != null && resource.status != Resource.Status.LOADING) {
+            viewModel.deleteProductImage().observe(getViewLifecycleOwner(), resource -> {
+                if (resource == null) return;
+                setLoading(resource.status == Resource.Status.LOADING);
+                if (resource.status != Resource.Status.LOADING) {
                     if (resource.status == Resource.Status.SUCCESS) {
                         Toast.makeText(getContext(), successMsg, Toast.LENGTH_SHORT).show();
                     } else {
@@ -231,9 +214,6 @@ public class ProductDetailFragment extends Fragment {
         }
     }
 
-    /**
-     * Uploads the selected image file to the server.
-     */
     private void uploadProductImageAndNavigate(Uri uri, String successMsg) {
         File file = FileUtils.getFileFromUri(requireContext(), uri);
         if (file == null) {
@@ -245,8 +225,10 @@ public class ProductDetailFragment extends Fragment {
         RequestBody requestFile = RequestBody.create(file, MediaType.parse(requireContext().getContentResolver().getType(uri)));
         MultipartBody.Part body = MultipartBody.Part.createFormData("image", file.getName(), requestFile);
 
-        viewModel.uploadProductImage(prodId, body).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status != Resource.Status.LOADING) {
+        viewModel.uploadProductImage(body).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status != Resource.Status.LOADING) {
                 if (resource.status == Resource.Status.SUCCESS) {
                     Toast.makeText(getContext(), successMsg, Toast.LENGTH_SHORT).show();
                 } else {
@@ -257,69 +239,47 @@ public class ProductDetailFragment extends Fragment {
         });
     }
 
-    /**
-     * Validates input fields and saves product information to the backend.
-     */
     private void saveProduct() {
         if (!InputValidator.isNotEmpty(binding.etProductName, "Product Name")) return;
-
-        if (binding.spinnerProductCategory.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a category", Toast.LENGTH_SHORT).show(); return;
-        }
-
-        if (!InputValidator.isNotEmpty(binding.etProductPrice, "Price") ||
-            !InputValidator.isPositiveDecimal(binding.etProductPrice, "Price")) {
-            return;
-        }
+        if (!InputValidator.isSpinnerSelected(binding.spinnerProductCategory, "Category")) return;
+        if (!InputValidator.isPositiveDecimal(binding.etProductPrice, "Price")) return;
 
         String name = binding.etProductName.getText().toString().trim();
         String desc = binding.etProductDesc.getText().toString().trim();
         BigDecimal price = new BigDecimal(binding.etProductPrice.getText().toString().trim());
 
-        CategoryDTO category = categoryList.get(binding.spinnerProductCategory.getSelectedItemPosition() - 1);
+        CategoryDTO category = viewModel.getCategoryList().getValue().get(binding.spinnerProductCategory.getSelectedItemPosition() - 1);
         ProductDTO dto = new ProductDTO(name, category.getCategoryId(), desc, price);
 
-        if (isEditing) {
-            viewModel.updateProduct(prodId, dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource != null && resource.status != Resource.Status.LOADING) {
-                    if (resource.status == Resource.Status.SUCCESS) {
-                        performPendingImageActions("Updated");
-                    } else {
-                        Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
+        viewModel.saveProduct(dto).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status != Resource.Status.LOADING) {
+                if (resource.status == Resource.Status.SUCCESS) {
+                    if (resource.data != null) {
+                        viewModel.setProdId(resource.data.getProdId());
                     }
+                    performPendingImageActions(viewModel.isEditing() ? "Updated" : "Saved");
+                } else {
+                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
                 }
-            });
-        } else {
-            viewModel.createProduct(dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource != null && resource.status != Resource.Status.LOADING) {
-                    if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                        prodId = resource.data.getProdId();
-                        performPendingImageActions("Saved");
-                    } else {
-                        Toast.makeText(getContext(), "Error saving: " + resource.message, Toast.LENGTH_SHORT).show();
-                    }
-                }
-            });
-        }
+            }
+        });
     }
 
-    /**
-     * Displays a confirmation dialog before deleting the product.
-     */
     private void confirmDelete() {
         DialogUtils.showDeleteConfirmDialog(requireContext(), "Product", () -> 
-                viewModel.deleteProduct(prodId).observe(getViewLifecycleOwner(), resource -> {
-                    if (resource != null && resource.status == Resource.Status.SUCCESS) {
+                viewModel.deleteProduct().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
+                    if (resource.status == Resource.Status.SUCCESS) {
                         navigateBack();
-                    } else if (resource != null && resource.status == Resource.Status.ERROR) {
+                    } else if (resource.status == Resource.Status.ERROR) {
                         Toast.makeText(getContext(), "Delete failed: " + resource.message, Toast.LENGTH_SHORT).show();
                     }
                 }));
     }
 
-    /**
-     * Navigates back to the previous fragment.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/ProductSupplierDetailFragment.java

@@ -15,9 +15,8 @@ import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.SpinnerUtils;
-import com.example.petstoremobile.viewmodels.ProductSupplierViewModel;
-import com.example.petstoremobile.viewmodels.ProductViewModel;
-import com.example.petstoremobile.viewmodels.SupplierViewModel;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.ProductSupplierDetailViewModel;
 
 import java.math.BigDecimal;
 import java.util.*;
@@ -31,26 +30,15 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class ProductSupplierDetailFragment extends Fragment {
 
     private FragmentProductSupplierDetailBinding binding;
+    private ProductSupplierDetailViewModel viewModel;
 
-    private boolean isEditing = false;
-    private long editProductId = -1;
-    private long editSupplierId = -1;
     private long preselectedProductId = -1;
     private long preselectedSupplierId = -1;
 
-    private List<ProductDTO> productList = new ArrayList<>();
-    private List<SupplierDTO> supplierList = new ArrayList<>();
-
-    private ProductSupplierViewModel psViewModel;
-    private ProductViewModel productViewModel;
-    private SupplierViewModel supplierViewModel;
-
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        psViewModel = new ViewModelProvider(this).get(ProductSupplierViewModel.class);
-        productViewModel = new ViewModelProvider(this).get(ProductViewModel.class);
-        supplierViewModel = new ViewModelProvider(this).get(SupplierViewModel.class);
+        viewModel = new ViewModelProvider(this).get(ProductSupplierDetailViewModel.class);
     }
 
     @Override
@@ -63,6 +51,7 @@ public class ProductSupplierDetailFragment extends Fragment {
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
+        observeViewModel();
         loadSpinnersData();
         handleArguments();
 
@@ -71,128 +60,97 @@ public class ProductSupplierDetailFragment extends Fragment {
         binding.btnDeletePS.setOnClickListener(v -> confirmDelete());
     }
 
+    private void observeViewModel() {
+        viewModel.getProductList().observe(getViewLifecycleOwner(), list -> refreshProductSpinner());
+        viewModel.getSupplierList().observe(getViewLifecycleOwner(), list -> refreshSupplierSpinner());
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Fetches products and suppliers to populate the spinners.
-     */
     private void loadSpinnersData() {
-        loadProducts();
-        loadSuppliers();
-    }
-
-    /**
-     * Loads the list of products from the API.
-     */
-    private void loadProducts() {
-        productViewModel.getAllProducts(null, null, 0, 200, "prodName").observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadProducts().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                productList = resource.data.getContent();
-                refreshProductSpinner();
+                viewModel.setProductList(resource.data.getContent());
+            }
+        });
+        viewModel.loadSuppliers().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setSupplierList(resource.data.getContent());
             }
         });
     }
 
     private void refreshProductSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerPSProduct, productList,
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerPSProduct, viewModel.getProductList().getValue(),
                 ProductDTO::getProdName, "-- Select Product --",
                 preselectedProductId, ProductDTO::getProdId);
     }
 
-    /**
-     * Loads the list of suppliers from the API.
-     */
-    private void loadSuppliers() {
-        supplierViewModel.getAllSuppliers(0, 200, null, "supCompany").observe(getViewLifecycleOwner(), resource -> {
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                supplierList = resource.data.getContent();
-                refreshSupplierSpinner();
-            }
-        });
-    }
-
     private void refreshSupplierSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerPSSupplier, supplierList,
+        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerPSSupplier, viewModel.getSupplierList().getValue(),
                 SupplierDTO::getSupCompany, "-- Select Supplier --",
                 preselectedSupplierId, SupplierDTO::getSupId);
     }
 
-    /**
-     * Handles arguments to determine if the fragment is in edit or add mode.
-     */
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.containsKey("productId") && a.containsKey("supplierId")) {
-            isEditing = true;
-            editProductId = a.getLong("productId");
-            editSupplierId = a.getLong("supplierId");
-            preselectedProductId = editProductId;
-            preselectedSupplierId = editSupplierId;
+            long productId = a.getLong("productId");
+            long supplierId = a.getLong("supplierId");
+            viewModel.setEditMode(productId, supplierId);
+            preselectedProductId = productId;
+            preselectedSupplierId = supplierId;
             
             binding.tvPSMode.setText("Edit Product Supplier");
             binding.btnDeletePS.setVisibility(View.VISIBLE);
-
         } else {
             binding.tvPSMode.setText("Add Product Supplier");
             binding.btnDeletePS.setVisibility(View.GONE);
         }
     }
 
-
-    /**
-     * Validates input and saves the product-supplier to the backend.
-     */
     private void save() {
-        if (binding.spinnerPSProduct.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a product", Toast.LENGTH_SHORT).show(); return;
-        }
-        if (binding.spinnerPSSupplier.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a supplier", Toast.LENGTH_SHORT).show(); return;
-        }
+        if (!InputValidator.isSpinnerSelected(binding.spinnerPSProduct, "Product")) return;
+        if (!InputValidator.isSpinnerSelected(binding.spinnerPSSupplier, "Supplier")) return;
+        if (!InputValidator.isPositiveDecimal(binding.etPSCost, "Cost")) return;
 
-        if (!InputValidator.isNotEmpty(binding.etPSCost, "Cost") ||
-            !InputValidator.isPositiveDecimal(binding.etPSCost, "Cost")) {
-            return;
-        }
-
-        ProductDTO product   = productList.get(binding.spinnerPSProduct.getSelectedItemPosition() - 1);
-        SupplierDTO supplier = supplierList.get(binding.spinnerPSSupplier.getSelectedItemPosition() - 1);
+        ProductDTO product   = viewModel.getProductList().getValue().get(binding.spinnerPSProduct.getSelectedItemPosition() - 1);
+        SupplierDTO supplier = viewModel.getSupplierList().getValue().get(binding.spinnerPSSupplier.getSelectedItemPosition() - 1);
         BigDecimal cost = new BigDecimal(binding.etPSCost.getText().toString().trim());
 
-        ProductSupplierDTO dto = new ProductSupplierDTO(
-                product.getProdId(), supplier.getSupId(), cost);
+        ProductSupplierDTO dto = new ProductSupplierDTO(product.getProdId(), supplier.getSupId(), cost);
 
-        if (isEditing) {
-            psViewModel.updateProductSupplier(editProductId, editSupplierId, dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Updated", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        } else {
-            psViewModel.createProductSupplier(dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Saved", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        }
+        viewModel.saveProductSupplier(dto).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS) {
+                Toast.makeText(getContext(), viewModel.isEditing() ? "Updated" : "Saved", Toast.LENGTH_SHORT).show();
+                navigateBack();
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
+            }
+        });
     }
 
-    /**
-     * Shows a confirmation dialog before deleting a product-supplier relationship.
-     */
     private void confirmDelete() {
-        DialogUtils.showDeleteConfirmDialog(requireContext(), "Product Supplier", () ->
-                psViewModel.deleteProductSupplier(editProductId, editSupplierId).observe(getViewLifecycleOwner(), resource -> {
+        DialogUtils.showDeleteConfirmDialog(requireContext(), "Product Supplier Relationship", () ->
+                viewModel.deleteProductSupplier().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
                     if (resource.status == Resource.Status.SUCCESS) {
                         Toast.makeText(getContext(), "Deleted", Toast.LENGTH_SHORT).show();
                         navigateBack();
@@ -202,9 +160,6 @@ public class ProductSupplierDetailFragment extends Fragment {
                 }));
     }
 
-    /**
-     * Navigates back to the previous screen.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/PurchaseOrderDetailFragment.java

@@ -14,7 +14,7 @@ import androidx.navigation.fragment.NavHostFragment;
 import com.example.petstoremobile.databinding.FragmentPurchaseOrderDetailBinding;
 import com.example.petstoremobile.dtos.PurchaseOrderDTO;
 import com.example.petstoremobile.utils.Resource;
-import com.example.petstoremobile.viewmodels.PurchaseOrderViewModel;
+import com.example.petstoremobile.viewmodels.PurchaseOrderDetailViewModel;
 
 import dagger.hilt.android.AndroidEntryPoint;
 
@@ -25,13 +25,13 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class PurchaseOrderDetailFragment extends Fragment {
 
     private FragmentPurchaseOrderDetailBinding binding;
-    private PurchaseOrderViewModel viewModel;
+    private PurchaseOrderDetailViewModel viewModel;
     private long purchaseOrderId;
 
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(PurchaseOrderViewModel.class);
+        viewModel = new ViewModelProvider(this).get(PurchaseOrderDetailViewModel.class);
     }
 
     /**
@@ -66,9 +66,16 @@ public class PurchaseOrderDetailFragment extends Fragment {
         }
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     private void loadPurchaseOrderData() {
-        viewModel.getPurchaseOrderById(purchaseOrderId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadPurchaseOrder(purchaseOrderId).observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 PurchaseOrderDTO po = resource.data;
                 binding.tvPODetailId.setText("PO #" + po.getPurchaseOrderId());

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/RefundFragment.java

@@ -1,6 +1,5 @@
 package com.example.petstoremobile.fragments.listfragments.detailfragments;
 
-import android.app.AlertDialog;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.*;
@@ -12,7 +11,10 @@ import androidx.navigation.fragment.NavHostFragment;
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.databinding.FragmentRefundBinding;
 import com.example.petstoremobile.dtos.SaleDTO;
-import com.example.petstoremobile.viewmodels.SaleViewModel;
+import com.example.petstoremobile.viewmodels.RefundViewModel;
+import com.example.petstoremobile.utils.DialogUtils;
+import com.example.petstoremobile.utils.Resource;
+import com.example.petstoremobile.utils.SpinnerUtils;
 import dagger.hilt.android.AndroidEntryPoint;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
@@ -22,53 +24,23 @@ import java.util.*;
 public class RefundFragment extends Fragment {
 
     private FragmentRefundBinding binding;
-    private SaleViewModel saleViewModel;
-    private SaleDTO currentSale;
-    private List<SaleDTO> allSales = new ArrayList<>();
-
-    // Items available to refund (after accounting for previous refunds)
-    private List<RefundItem> availableItems = new ArrayList<>();
-    // Items user has added to refund cart
-    private List<RefundItem> refundCart = new ArrayList<>();
+    private RefundViewModel viewModel;
 
     private final String[] PAYMENT_METHODS = {"Cash", "Card"};
 
-    // Inner class to track refund items
-    static class RefundItem {
-        long prodId;
-        String productName;
-        int quantity;
-        BigDecimal unitPrice;
-
-        RefundItem(long prodId, String productName, int quantity, BigDecimal unitPrice) {
-            this.prodId = prodId;
-            this.productName = productName;
-            this.quantity = quantity;
-            this.unitPrice = unitPrice;
-        }
-
-        BigDecimal getTotal() {
-            return unitPrice != null
-                    ? unitPrice.multiply(BigDecimal.valueOf(quantity))
-                    : BigDecimal.ZERO;
-        }
-    }
-
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         binding = FragmentRefundBinding.inflate(inflater, container, false);
-        saleViewModel = new ViewModelProvider(this).get(SaleViewModel.class);
+        viewModel = new ViewModelProvider(this).get(RefundViewModel.class);
         
         setupSpinner();
+        observeViewModel();
         loadAllSales();
 
-        // Pre-fill sale ID if passed from SaleFragment
         Bundle args = getArguments();
         if (args != null && args.containsKey("saleId")) {
-            long saleId = args.getLong("saleId");
-            binding.etRefundSaleId.setText(String.valueOf(saleId));
-            // Auto-load after sales are fetched
+            binding.etRefundSaleId.setText(String.valueOf(args.getLong("saleId")));
         }
 
         binding.btnLoadSale.setOnClickListener(v -> loadSale());
@@ -79,31 +51,36 @@ public class RefundFragment extends Fragment {
     }
 
     private void setupSpinner() {
-        binding.spinnerRefundPayment.setAdapter(new ArrayAdapter<>(requireContext(),
-                android.R.layout.simple_spinner_item, PAYMENT_METHODS));
+        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerRefundPayment, PAYMENT_METHODS);
+    }
+
+    private void observeViewModel() {
+        viewModel.getAvailableItems().observe(getViewLifecycleOwner(), items -> renderOriginalItems());
+        viewModel.getRefundCart().observe(getViewLifecycleOwner(), cart -> {
+            renderRefundCart();
+            updateRefundTotal();
+            renderOriginalItems(); // Re-render to reflect quantities in cart
+        });
+    }
+
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
     }
 
     private void loadAllSales() {
-        saleViewModel.getAllSales(0, 1000, null, null, null, "saleDate,desc")
-                .observe(getViewLifecycleOwner(), resource -> {
-                    if (resource != null) {
-                        switch (resource.status) {
-                            case SUCCESS:
-                                if (resource.data != null) {
-                                    allSales = resource.data.getContent();
-                                    // Auto-load if saleId was pre-filled
-                                    Bundle args = getArguments();
-                                    if (args != null && args.containsKey("saleId")) {
-                                        loadSale();
-                                    }
-                                }
-                                break;
-                            case ERROR:
-                                Log.e("Refund", "Failed to load sales: " + resource.message);
-                                break;
-                        }
-                    }
-                });
+        viewModel.loadAllSales().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                viewModel.setAllSales(resource.data.getContent());
+                Bundle args = getArguments();
+                if (args != null && args.containsKey("saleId")) {
+                    loadSale();
+                }
+            }
+        });
     }
 
     private void loadSale() {
@@ -120,11 +97,12 @@ public class RefundFragment extends Fragment {
             return;
         }
 
-        // Find sale in loaded list
         SaleDTO found = null;
-        for (SaleDTO s : allSales) {
-            if (s.getSaleId() != null && s.getSaleId() == saleId) {
-                found = s; break;
+        if (viewModel.getAllSalesList() != null) {
+            for (SaleDTO s : viewModel.getAllSalesList()) {
+                if (s.getSaleId() != null && s.getSaleId() == saleId) {
+                    found = s; break;
+                }
             }
         }
 
@@ -139,9 +117,9 @@ public class RefundFragment extends Fragment {
             return;
         }
 
-        currentSale = found;
+        viewModel.setCurrentSale(found);
+        SaleDTO currentSale = viewModel.getCurrentSale();
 
-        // Show sale info
         binding.tvSaleInfo.setVisibility(View.VISIBLE);
         binding.tvSaleInfo.setText("Sale #" + currentSale.getSaleId()
                 + " | " + (currentSale.getSaleDate() != null
@@ -151,94 +129,44 @@ public class RefundFragment extends Fragment {
                 + " | Total: $" + currentSale.getTotalAmount()
                 + " | Payment: " + currentSale.getPaymentMethod());
 
-        // Pre-select payment method
         if (currentSale.getPaymentMethod() != null) {
-            for (int i = 0; i < PAYMENT_METHODS.length; i++) {
-                if (PAYMENT_METHODS[i].equalsIgnoreCase(currentSale.getPaymentMethod())) {
-                    binding.spinnerRefundPayment.setSelection(i); break;
-                }
-            }
+            SpinnerUtils.setSelectionByValue(binding.spinnerRefundPayment, currentSale.getPaymentMethod());
         }
 
-        // Build refundable items accounting for previous refunds
-        buildRefundableItems();
-
-        if (availableItems.isEmpty()) {
-            Toast.makeText(getContext(),
-                    "This sale has no remaining refundable items", Toast.LENGTH_LONG).show();
+        if (viewModel.getAvailableItems().getValue() == null || viewModel.getAvailableItems().getValue().isEmpty()) {
+            Toast.makeText(getContext(), "This sale has no remaining refundable items", Toast.LENGTH_LONG).show();
             return;
         }
 
-        // Reset refund cart
-        refundCart.clear();
-
-        // Show cards
         binding.cardOriginalItems.setVisibility(View.VISIBLE);
         binding.cardRefundItems.setVisibility(View.VISIBLE);
         binding.cardPayment.setVisibility(View.VISIBLE);
         binding.btnProcessRefund.setVisibility(View.VISIBLE);
-
-        renderOriginalItems();
-        renderRefundCart();
-        updateRefundTotal();
-    }
-
-    private void buildRefundableItems() {
-        availableItems.clear();
-        if (currentSale.getItems() == null) return;
-
-        // Find all previous refunds for this sale
-        Map<Long, Integer> alreadyRefunded = new HashMap<>();
-        for (SaleDTO s : allSales) {
-            if (Boolean.TRUE.equals(s.getIsRefund())
-                    && currentSale.getSaleId().equals(s.getOriginalSaleId())
-                    && s.getItems() != null) {
-                for (SaleDTO.SaleItemDTO item : s.getItems()) {
-                    if (item.getProdId() != null && item.getQuantity() != null) {
-                        alreadyRefunded.merge(item.getProdId(),
-                                Math.abs(item.getQuantity()), Integer::sum);
-                    }
-                }
-            }
-        }
-
-        // Build available items
-        for (SaleDTO.SaleItemDTO item : currentSale.getItems()) {
-            if (item.getProdId() == null || item.getQuantity() == null) continue;
-            int refunded = alreadyRefunded.getOrDefault(item.getProdId(), 0);
-            int remaining = item.getQuantity() - refunded;
-            if (remaining > 0) {
-                availableItems.add(new RefundItem(
-                        item.getProdId(),
-                        item.getProductName() != null ? item.getProductName() : "Unknown",
-                        remaining,
-                        item.getUnitPrice()
-                ));
-            }
-        }
     }
 
     private void renderOriginalItems() {
         binding.llOriginalItems.removeAllViews();
+        List<RefundViewModel.RefundItem> available = viewModel.getAvailableItems().getValue();
+        if (available == null) return;
 
-        // Header
         addTableHeader(binding.llOriginalItems);
 
-        for (RefundItem item : availableItems) {
-            // Calculate pending in cart
-            int pendingQty = 0;
-            for (RefundItem r : refundCart) {
-                if (r.prodId == item.prodId) { pendingQty = r.quantity; break; }
+        for (RefundViewModel.RefundItem item : available) {
+            int inCart = 0;
+            if (viewModel.getRefundCart().getValue() != null) {
+                for (RefundViewModel.RefundItem r : viewModel.getRefundCart().getValue()) {
+                    if (r.prodId == item.prodId) { inCart = r.quantity; break; }
+                }
             }
-            int displayQty = item.quantity - pendingQty;
+            int displayQty = item.quantity - inCart;
             if (displayQty <= 0) continue;
 
             LinearLayout row = buildItemRow(
                     item.productName,
                     displayQty,
                     item.unitPrice,
-                    true, // show add button
-                    () -> showQuantityDialog(item)
+                    true,
+                    () -> showQuantityDialog(item, displayQty)
             );
             binding.llOriginalItems.addView(row);
         }
@@ -246,8 +174,9 @@ public class RefundFragment extends Fragment {
 
     private void renderRefundCart() {
         binding.llRefundItems.removeAllViews();
+        List<RefundViewModel.RefundItem> cart = viewModel.getRefundCart().getValue();
 
-        if (refundCart.isEmpty()) {
+        if (cart == null || cart.isEmpty()) {
             TextView empty = new TextView(getContext());
             empty.setText("No items added to refund yet");
             empty.setTextColor(0xFF888780);
@@ -258,18 +187,13 @@ public class RefundFragment extends Fragment {
 
         addTableHeader(binding.llRefundItems);
 
-        for (RefundItem item : refundCart) {
+        for (RefundViewModel.RefundItem item : cart) {
             LinearLayout row = buildItemRow(
                     item.productName,
                     item.quantity,
                     item.unitPrice,
-                    false, // show remove button
-                    () -> {
-                        refundCart.remove(item);
-                        renderOriginalItems();
-                        renderRefundCart();
-                        updateRefundTotal();
-                    }
+                    false,
+                    () -> viewModel.removeFromCart(item)
             );
             binding.llRefundItems.addView(row);
         }
@@ -342,146 +266,79 @@ public class RefundFragment extends Fragment {
         return row;
     }
 
-    private void showQuantityDialog(RefundItem item) {
-        // Calculate how many are already in cart
-        int inCart = 0;
-        for (RefundItem r : refundCart) {
-            if (r.prodId == item.prodId) { inCart = r.quantity; break; }
-        }
-        int available = item.quantity - inCart;
-        if (available <= 0) {
-            Toast.makeText(getContext(), "All units already added to refund",
-                    Toast.LENGTH_SHORT).show();
-            return;
-        }
-
-        // Build dialog
-        AlertDialog.Builder builder = new AlertDialog.Builder(requireContext());
-        builder.setTitle("Refund Quantity");
-        builder.setMessage("Product: " + item.productName
-                + "\nAvailable: " + available);
-
+    private void showQuantityDialog(RefundViewModel.RefundItem item, int available) {
         EditText input = new EditText(getContext());
         input.setInputType(android.text.InputType.TYPE_CLASS_NUMBER);
         input.setText(String.valueOf(available));
         input.setSelectAllOnFocus(true);
-        builder.setView(input);
+        input.setPadding(40, 40, 40, 40);
 
-        builder.setPositiveButton("Add to Refund", (d, w) -> {
-            String val = input.getText().toString().trim();
-            if (val.isEmpty()) return;
-            int qty;
-            try { qty = Integer.parseInt(val); }
-            catch (Exception e) {
-                Toast.makeText(getContext(), "Invalid quantity", Toast.LENGTH_SHORT).show();
-                return;
-            }
-            if (qty <= 0) {
-                Toast.makeText(getContext(), "Quantity must be at least 1",
-                        Toast.LENGTH_SHORT).show();
-                return;
-            }
-            if (qty > available) {
-                Toast.makeText(getContext(), "Cannot exceed " + available,
-                        Toast.LENGTH_SHORT).show();
-                return;
-            }
-
-            // Add or merge into cart
-            boolean merged = false;
-            for (int i = 0; i < refundCart.size(); i++) {
-                if (refundCart.get(i).prodId == item.prodId) {
-                    RefundItem existing = refundCart.get(i);
-                    refundCart.set(i, new RefundItem(existing.prodId,
-                            existing.productName,
-                            existing.quantity + qty,
-                            existing.unitPrice));
-                    merged = true; break;
-                }
-            }
-            if (!merged) {
-                refundCart.add(new RefundItem(item.prodId, item.productName,
-                        qty, item.unitPrice));
-            }
-
-            renderOriginalItems();
-            renderRefundCart();
-            updateRefundTotal();
-        });
-
-        builder.setNegativeButton("Cancel", null);
-        builder.show();
+        new androidx.appcompat.app.AlertDialog.Builder(requireContext())
+                .setTitle("Refund Quantity")
+                .setMessage("Product: " + item.productName + "\nAvailable: " + available)
+                .setView(input)
+                .setPositiveButton("Add to Refund", (d, w) -> {
+                    String val = input.getText().toString().trim();
+                    if (val.isEmpty()) return;
+                    int qty;
+                    try { qty = Integer.parseInt(val); }
+                    catch (Exception e) {
+                        Toast.makeText(getContext(), "Invalid quantity", Toast.LENGTH_SHORT).show();
+                        return;
+                    }
+                    if (qty <= 0) {
+                        Toast.makeText(getContext(), "Quantity must be at least 1", Toast.LENGTH_SHORT).show();
+                        return;
+                    }
+                    if (qty > available) {
+                        Toast.makeText(getContext(), "Cannot exceed " + available, Toast.LENGTH_SHORT).show();
+                        return;
+                    }
+                    viewModel.addToCart(item, qty);
+                })
+                .setNegativeButton("Cancel", null)
+                .show();
     }
 
     private void updateRefundTotal() {
         BigDecimal total = BigDecimal.ZERO;
-        for (RefundItem item : refundCart) total = total.add(item.getTotal());
+        List<RefundViewModel.RefundItem> cart = viewModel.getRefundCart().getValue();
+        if (cart != null) {
+            for (RefundViewModel.RefundItem item : cart) total = total.add(item.getTotal());
+        }
         binding.tvRefundTotal.setText("Refund Total: $" + total.setScale(2, RoundingMode.HALF_UP));
     }
 
     private void processRefund() {
-        if (currentSale == null) {
+        if (viewModel.getCurrentSale() == null) {
             Toast.makeText(getContext(), "Load a sale first", Toast.LENGTH_SHORT).show();
             return;
         }
-        if (refundCart.isEmpty()) {
-            Toast.makeText(getContext(), "Add at least one item to refund",
-                    Toast.LENGTH_SHORT).show();
+        if (viewModel.getRefundCart().getValue() == null || viewModel.getRefundCart().getValue().isEmpty()) {
+            Toast.makeText(getContext(), "Add at least one item to refund", Toast.LENGTH_SHORT).show();
             return;
         }
 
         String payment = PAYMENT_METHODS[binding.spinnerRefundPayment.getSelectedItemPosition()];
-
-        // Confirm dialog
         BigDecimal total = BigDecimal.ZERO;
-        for (RefundItem item : refundCart) total = total.add(item.getTotal());
+        for (RefundViewModel.RefundItem item : viewModel.getRefundCart().getValue()) total = total.add(item.getTotal());
         final BigDecimal finalTotal = total;
 
-        new AlertDialog.Builder(requireContext())
-                .setTitle("Confirm Refund")
-                .setMessage("Process refund for Sale #" + currentSale.getSaleId()
-                        + "?\nRefund amount: $" + finalTotal.setScale(2, RoundingMode.HALF_UP))
-                .setPositiveButton("Yes", (d, w) -> submitRefund(payment))
-                .setNegativeButton("No", null)
-                .show();
+        DialogUtils.showConfirmDialog(requireContext(), "Confirm Refund", 
+                "Process refund for Sale #" + viewModel.getCurrentSale().getSaleId()
+                        + "?\nRefund amount: $" + finalTotal.setScale(2, RoundingMode.HALF_UP),
+                () -> submitRefund(payment));
     }
 
     private void submitRefund(String payment) {
-        // Build sale items list
-        List<SaleDTO.SaleItemDTO> items = new ArrayList<>();
-        for (RefundItem item : refundCart) {
-            // Backend expects negative quantity for refunds
-            items.add(new SaleDTO.SaleItemDTO(item.prodId, -item.quantity));
-        }
-
-        SaleDTO dto = new SaleDTO(
-                currentSale.getStoreId(),
-                payment,
-                items,
-                true,                        // isRefund = true
-                currentSale.getSaleId(),     // originalSaleId
-                null                         // no customer needed
-        );
-
-        Log.d("REFUND", "Submitting refund for saleId=" + currentSale.getSaleId()
-                + " items=" + items.size());
-
-        saleViewModel.createSale(dto).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.submitRefund(payment).observe(getViewLifecycleOwner(), resource -> {
             if (resource != null) {
-                switch (resource.status) {
-                    case SUCCESS:
-                        if (resource.data != null) {
-                            Toast.makeText(getContext(),
-                                    "Refund #" + resource.data.getSaleId() + " processed successfully!",
-                                    Toast.LENGTH_LONG).show();
-                            navigateBack();
-                        }
-                        break;
-                    case ERROR:
-                        Log.e("REFUND", "Error: " + resource.message);
-                        Toast.makeText(getContext(), "Error: " + resource.message,
-                                Toast.LENGTH_LONG).show();
-                        break;
+                setLoading(resource.status == Resource.Status.LOADING);
+                if (resource.status == Resource.Status.SUCCESS) {
+                    Toast.makeText(getContext(), "Refund processed successfully!", Toast.LENGTH_LONG).show();
+                    navigateBack();
+                } else if (resource.status == Resource.Status.ERROR) {
+                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_LONG).show();
                 }
             }
         });

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/SaleDetailFragment.java

@@ -11,10 +11,12 @@ import androidx.navigation.fragment.NavHostFragment;
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.databinding.FragmentSaleDetailBinding;
 import com.example.petstoremobile.dtos.*;
-import com.example.petstoremobile.viewmodels.*;
+import com.example.petstoremobile.viewmodels.SaleDetailViewModel;
 import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.utils.DialogUtils;
+import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
+import com.example.petstoremobile.utils.UIUtils;
 import dagger.hilt.android.AndroidEntryPoint;
 import java.math.BigDecimal;
 import java.util.*;
@@ -23,18 +25,7 @@ import java.util.*;
 public class SaleDetailFragment extends Fragment {
 
     private FragmentSaleDetailBinding binding;
-    private SaleViewModel saleViewModel;
-    private StoreViewModel storeViewModel;
-    private CustomerViewModel customerViewModel;
-    private ProductViewModel productViewModel;
-
-    private boolean viewOnly = false;
-    private long saleId = -1;
-
-    private List<StoreDTO> storeList = new ArrayList<>();
-    private List<CustomerDTO> customerList = new ArrayList<>();
-    private List<ProductDTO> productList = new ArrayList<>();
-    private List<SaleDTO.SaleItemDTO> cartItems = new ArrayList<>();
+    private SaleDetailViewModel viewModel;
 
     private final String[] PAYMENT_METHODS = { "Cash", "Card"};
 
@@ -42,17 +33,14 @@ public class SaleDetailFragment extends Fragment {
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         binding = FragmentSaleDetailBinding.inflate(inflater, container, false);
-        
-        saleViewModel = new ViewModelProvider(this).get(SaleViewModel.class);
-        storeViewModel = new ViewModelProvider(this).get(StoreViewModel.class);
-        customerViewModel = new ViewModelProvider(this).get(CustomerViewModel.class);
-        productViewModel = new ViewModelProvider(this).get(ProductViewModel.class);
+        viewModel = new ViewModelProvider(this).get(SaleDetailViewModel.class);
 
         SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerPaymentMethod, PAYMENT_METHODS);
 
+        observeViewModel();
         handleArguments();
 
-        if (!viewOnly) {
+        if (!viewModel.isViewOnly()) {
             loadData();
             setupAddItem();
         }
@@ -64,32 +52,55 @@ public class SaleDetailFragment extends Fragment {
         return binding.getRoot();
     }
 
+    private void observeViewModel() {
+        viewModel.getStoreList().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleStore, list,
+                    DropdownDTO::getLabel, "-- Select Store --", -1L, DropdownDTO::getId);
+        });
+
+        viewModel.getCustomerList().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleCustomer, list,
+                    DropdownDTO::getLabel, "-- No Customer --", -1L, DropdownDTO::getId);
+        });
+
+        viewModel.getProductList().observe(getViewLifecycleOwner(), list -> {
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleProduct, list,
+                    ProductDTO::getProdName, "Select Product", -1L, ProductDTO::getProdId);
+        });
+
+        viewModel.getCartItems().observe(getViewLifecycleOwner(), items -> {
+            renderCartItems();
+            updateTotal();
+        });
+    }
+
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.containsKey("saleId")) {
-            saleId = a.getLong("saleId");
-            viewOnly = a.getBoolean("viewOnly", false);
+            long saleId = a.getLong("saleId");
+            boolean viewOnly = a.getBoolean("viewOnly", false);
+            viewModel.setSaleId(saleId, viewOnly);
+            
             binding.tvSaleMode.setText("Sale #" + saleId);
             binding.tvSaleDetailId.setText("ID: " + saleId);
 
-            // Show refund button for existing non-refund sales
             if (!a.getBoolean("isRefund", false)) {
                 binding.btnRefundSale.setVisibility(View.VISIBLE);
             }
 
-            // Hide save and input controls for view only
             if (viewOnly) {
                 binding.btnSaveSale.setVisibility(View.GONE);
-                binding.spinnerSaleStore.setEnabled(false);
-                binding.spinnerSaleCustomer.setEnabled(false);
-                binding.spinnerPaymentMethod.setEnabled(false);
+                UIUtils.setViewsEnabled(false, 
+                        binding.spinnerSaleStore, 
+                        binding.spinnerSaleCustomer, 
+                        binding.spinnerPaymentMethod);
                 binding.llAddItemRow.setVisibility(View.GONE);
                 binding.llExtraInfo.setVisibility(View.VISIBLE);
             }
 
-            // Load sale details
             loadSaleDetails();
         } else {
+            viewModel.setSaleId(-1, false);
             binding.tvSaleMode.setText("New Sale");
             binding.tvSaleDetailId.setVisibility(View.GONE);
             binding.btnRefundSale.setVisibility(View.GONE);
@@ -97,89 +108,62 @@ public class SaleDetailFragment extends Fragment {
         }
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     private void loadData() {
-        loadStores();
-        loadCustomers();
-        loadProducts();
-    }
-
-    private void loadStores() {
-        storeViewModel.getAllStores(0, 50).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                storeList = resource.data.getContent();
-                if (binding != null) {
-                    SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleStore, storeList,
-                            StoreDTO::getStoreName, "-- Select Store --", -1L, StoreDTO::getStoreId);
-                }
-            } else if (storeList.isEmpty()) {
-                storeList = Collections.singletonList(new StoreDTO(1L, "Downtown Branch"));
-                if (binding != null) {
-                    SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleStore, storeList,
-                            StoreDTO::getStoreName, "-- Select Store --", -1L, StoreDTO::getStoreId);
-                }
-            }
+        viewModel.loadStores().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) viewModel.setStoreList(resource.data);
         });
-    }
-
-    private void loadCustomers() {
-        customerViewModel.getAllCustomers(0, 200).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                customerList = resource.data.getContent();
-                if (binding != null) {
-                    SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleCustomer, customerList,
-                            CustomerDTO::getFullName, "-- No Customer --", -1L, CustomerDTO::getCustomerId);
-                }
-            }
+        viewModel.loadCustomers().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) viewModel.setCustomerList(resource.data);
         });
-    }
-
-    private void loadProducts() {
-        productViewModel.getAllProducts(null, null, 0, 200, null).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                productList = resource.data.getContent();
-                if (binding != null) {
-                    SpinnerUtils.populateSpinner(requireContext(), binding.spinnerSaleProduct, productList,
-                            ProductDTO::getProdName, "Select Product", -1L, ProductDTO::getProdId);
-                }
-            }
+        viewModel.loadProducts().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) viewModel.setProductList(resource.data.getContent());
         });
     }
 
     private void loadSaleDetails() {
-        saleViewModel.getSaleById(saleId).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+        viewModel.loadSaleDetails().observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 SaleDTO sale = resource.data;
-                if (binding != null) {
-                    binding.tvSaleDetailTotal.setText("Total: $" + sale.getTotalAmount());
-                    binding.tvSaleSubtotal.setText("$" + (sale.getSubtotalAmount() != null ? sale.getSubtotalAmount() : sale.getTotalAmount()));
-                    
-                    if (sale.getCouponDiscountAmount() != null && sale.getCouponDiscountAmount().compareTo(BigDecimal.ZERO) > 0) {
-                        binding.llCouponDiscount.setVisibility(View.VISIBLE);
-                        binding.tvSaleCouponDiscount.setText("-$" + sale.getCouponDiscountAmount());
-                    } else {
-                        binding.llCouponDiscount.setVisibility(View.GONE);
-                    }
+                binding.tvSaleDetailTotal.setText("Total: $" + sale.getTotalAmount());
+                binding.tvSaleSubtotal.setText("$" + (sale.getSubtotalAmount() != null ? sale.getSubtotalAmount() : sale.getTotalAmount()));
+                
+                if (sale.getCouponDiscountAmount() != null && sale.getCouponDiscountAmount().compareTo(BigDecimal.ZERO) > 0) {
+                    binding.llCouponDiscount.setVisibility(View.VISIBLE);
+                    binding.tvSaleCouponDiscount.setText("-$" + sale.getCouponDiscountAmount());
+                } else {
+                    binding.llCouponDiscount.setVisibility(View.GONE);
+                }
 
-                    if (sale.getEmployeeDiscountAmount() != null && sale.getEmployeeDiscountAmount().compareTo(BigDecimal.ZERO) > 0) {
-                        binding.llEmployeeDiscount.setVisibility(View.VISIBLE);
-                        binding.tvSaleEmployeeDiscount.setText("-$" + sale.getEmployeeDiscountAmount());
-                    } else {
-                        binding.llEmployeeDiscount.setVisibility(View.GONE);
-                    }
+                if (sale.getEmployeeDiscountAmount() != null && sale.getEmployeeDiscountAmount().compareTo(BigDecimal.ZERO) > 0) {
+                    binding.llEmployeeDiscount.setVisibility(View.VISIBLE);
+                    binding.tvSaleEmployeeDiscount.setText("-$" + sale.getEmployeeDiscountAmount());
+                } else {
+                    binding.llEmployeeDiscount.setVisibility(View.GONE);
+                }
 
-                    binding.tvSaleChannel.setText(sale.getChannel() != null ? sale.getChannel() : "—");
-                    binding.tvSalePoints.setText(String.valueOf(sale.getPointsEarned() != null ? sale.getPointsEarned() : 0));
+                binding.tvSaleChannel.setText(sale.getChannel() != null ? sale.getChannel() : "—");
+                binding.tvSalePoints.setText(String.valueOf(sale.getPointsEarned() != null ? sale.getPointsEarned() : 0));
 
-                    SpinnerUtils.setSelectionByValue(binding.spinnerPaymentMethod, sale.getPaymentMethod());
+                SpinnerUtils.setSelectionByValue(binding.spinnerPaymentMethod, sale.getPaymentMethod());
 
-                    // Display items
-                    if (sale.getItems() != null) {
-                        binding.llSaleItems.removeAllViews();
-                        for (SaleDTO.SaleItemDTO item : sale.getItems()) {
-                            addItemRow(item.getProductName(),
-                                    Math.abs(item.getQuantity()),
-                                    item.getUnitPrice());
-                        }
+                if (sale.getItems() != null) {
+                    binding.llSaleItems.removeAllViews();
+                    for (SaleDTO.SaleItemDTO item : sale.getItems()) {
+                        addItemRow(item.getProductName(), Math.abs(item.getQuantity()), item.getUnitPrice());
                     }
                 }
             }
@@ -188,41 +172,44 @@ public class SaleDetailFragment extends Fragment {
 
     private void setupAddItem() {
         binding.btnAddItem.setOnClickListener(v -> {
-            if (binding.spinnerSaleProduct.getSelectedItemPosition() == 0) {
-                Toast.makeText(getContext(), "Select a product", Toast.LENGTH_SHORT).show();
-                return;
-            }
-            String qtyStr = binding.etSaleQuantity.getText().toString().trim();
-            if (qtyStr.isEmpty()) {
-                binding.etSaleQuantity.setError("Enter quantity");
-                return;
-            }
-            int qty;
-            try {
-                qty = Integer.parseInt(qtyStr);
-            } catch (Exception e) {
-                binding.etSaleQuantity.setError("Invalid quantity");
-                return;
-            }
+            if (!InputValidator.isSpinnerSelected(binding.spinnerSaleProduct, "Product")) return;
+            if (!InputValidator.isPositiveInteger(binding.etSaleQuantity, "Quantity")) return;
 
-            ProductDTO product = productList.get(binding.spinnerSaleProduct.getSelectedItemPosition() - 1);
+            int qty = Integer.parseInt(binding.etSaleQuantity.getText().toString().trim());
+            ProductDTO product = viewModel.getProductList().getValue().get(binding.spinnerSaleProduct.getSelectedItemPosition() - 1);
 
-            // Check if product already in cart
-            for (SaleDTO.SaleItemDTO existing : cartItems) {
+            for (SaleDTO.SaleItemDTO existing : viewModel.getCartItems().getValue()) {
                 if (existing.getProdId().equals(product.getProdId())) {
                     Toast.makeText(getContext(), "Product already added", Toast.LENGTH_SHORT).show();
                     return;
                 }
             }
 
-            SaleDTO.SaleItemDTO item = new SaleDTO.SaleItemDTO(product.getProdId(), qty);
-            cartItems.add(item);
-            addItemRow(product.getProdName(), qty, product.getProdPrice());
-            updateTotal();
+            viewModel.addToCart(new SaleDTO.SaleItemDTO(product.getProdId(), qty));
             binding.etSaleQuantity.setText("");
         });
     }
 
+    private void renderCartItems() {
+        binding.llSaleItems.removeAllViews();
+        List<SaleDTO.SaleItemDTO> items = viewModel.getCartItems().getValue();
+        List<ProductDTO> products = viewModel.getProductList().getValue();
+        if (items == null || products == null) return;
+
+        for (SaleDTO.SaleItemDTO item : items) {
+            String name = "Unknown";
+            BigDecimal price = BigDecimal.ZERO;
+            for (ProductDTO p : products) {
+                if (p.getProdId().equals(item.getProdId())) {
+                    name = p.getProdName();
+                    price = p.getProdPrice();
+                    break;
+                }
+            }
+            addItemRow(name, item.getQuantity(), price);
+        }
+    }
+
     private void addItemRow(String name, int qty, BigDecimal price) {
         if (getContext() == null) return;
         LinearLayout row = new LinearLayout(getContext());
@@ -230,18 +217,15 @@ public class SaleDetailFragment extends Fragment {
         row.setPadding(0, 8, 0, 8);
 
         TextView tvName = new TextView(getContext());
-        tvName.setLayoutParams(new LinearLayout.LayoutParams(
-                0, LinearLayout.LayoutParams.WRAP_CONTENT, 2f));
+        tvName.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 2f));
         tvName.setText(name);
 
         TextView tvQty = new TextView(getContext());
-        tvQty.setLayoutParams(new LinearLayout.LayoutParams(
-                0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f));
+        tvQty.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f));
         tvQty.setText("x" + qty);
 
         TextView tvPrice = new TextView(getContext());
-        tvPrice.setLayoutParams(new LinearLayout.LayoutParams(
-                0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f));
+        tvPrice.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1f));
         tvPrice.setText(price != null ? "$" + price : "");
 
         row.addView(tvName);
@@ -251,59 +235,37 @@ public class SaleDetailFragment extends Fragment {
     }
 
     private void updateTotal() {
-        BigDecimal total = BigDecimal.ZERO;
-        for (SaleDTO.SaleItemDTO item : cartItems) {
-            for (ProductDTO p : productList) {
-                if (p.getProdId().equals(item.getProdId()) && p.getProdPrice() != null) {
-                    total = total.add(p.getProdPrice()
-                            .multiply(BigDecimal.valueOf(item.getQuantity())));
-                    break;
-                }
-            }
-        }
+        BigDecimal total = viewModel.calculateSubtotal();
         binding.tvSaleSubtotal.setText("$" + total);
         binding.tvSaleDetailTotal.setText("Total: $" + total);
     }
 
     private void saveSale() {
-        if (binding.spinnerSaleStore.getSelectedItemPosition() == 0) {
-            Toast.makeText(getContext(), "Select a store", Toast.LENGTH_SHORT).show();
-            return;
-        }
-        if (cartItems.isEmpty()) {
+        if (!InputValidator.isSpinnerSelected(binding.spinnerSaleStore, "Store")) return;
+
+        if (viewModel.getCartItems().getValue() == null || viewModel.getCartItems().getValue().isEmpty()) {
             Toast.makeText(getContext(), "Add at least one item", Toast.LENGTH_SHORT).show();
             return;
         }
 
-        StoreDTO store = storeList.get(binding.spinnerSaleStore.getSelectedItemPosition() - 1);
+        DropdownDTO store = viewModel.getStoreList().getValue().get(binding.spinnerSaleStore.getSelectedItemPosition() - 1);
         String payment = PAYMENT_METHODS[binding.spinnerPaymentMethod.getSelectedItemPosition()];
 
-        // Optional customer
         Long customerId = null;
         if (binding.spinnerSaleCustomer.getSelectedItemPosition() > 0) {
-            customerId = customerList.get(binding.spinnerSaleCustomer.getSelectedItemPosition() - 1)
-                    .getCustomerId();
+            customerId = viewModel.getCustomerList().getValue().get(binding.spinnerSaleCustomer.getSelectedItemPosition() - 1).getId();
         }
 
-        SaleDTO dto = new SaleDTO(
-                store.getStoreId(),
-                payment,
-                cartItems,
-                false,
-                null,
-                customerId);
+        SaleDTO dto = new SaleDTO(store.getId(), payment, viewModel.getCartItems().getValue(), false, null, customerId);
 
-        saleViewModel.createSale(dto).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.createSale(dto).observe(getViewLifecycleOwner(), resource -> {
             if (resource != null) {
-                switch (resource.status) {
-                    case SUCCESS:
-                        Toast.makeText(getContext(), "Sale saved!", Toast.LENGTH_SHORT).show();
-                        navigateBack();
-                        break;
-                    case ERROR:
-                        Log.e("SALE_SAVE", "Error: " + resource.message);
-                        DialogUtils.showInfoDialog(requireContext(), "Save Error", resource.message);
-                        break;
+                setLoading(resource.status == Resource.Status.LOADING);
+                if (resource.status == Resource.Status.SUCCESS) {
+                    Toast.makeText(getContext(), "Sale saved!", Toast.LENGTH_SHORT).show();
+                    navigateBack();
+                } else if (resource.status == Resource.Status.ERROR) {
+                    DialogUtils.showInfoDialog(requireContext(), "Save Error", resource.message);
                 }
             }
         });
@@ -313,7 +275,7 @@ public class SaleDetailFragment extends Fragment {
         DialogUtils.showConfirmDialog(requireContext(), "Process Refund", 
             "Are you sure you want to process a refund for this sale?", () -> {
             Bundle args = new Bundle();
-            args.putLong("saleId", saleId);
+            args.putLong("saleId", viewModel.getSaleId());
             NavHostFragment.findNavController(this).navigate(R.id.nav_refund, args);
         });
     }

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/ServiceDetailFragment.java

@@ -17,10 +17,11 @@ import com.example.petstoremobile.R;
 import com.example.petstoremobile.databinding.FragmentServiceDetailBinding;
 import com.example.petstoremobile.dtos.ServiceDTO;
 import com.example.petstoremobile.utils.ActivityLogger;
+import com.example.petstoremobile.utils.DateTimeUtils;
 import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
-import com.example.petstoremobile.viewmodels.ServiceViewModel;
+import com.example.petstoremobile.viewmodels.ServiceDetailViewModel;
 
 import dagger.hilt.android.AndroidEntryPoint;
 
@@ -31,15 +32,12 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class ServiceDetailFragment extends Fragment {
 
     private FragmentServiceDetailBinding binding;
-    private long serviceId;
-    private boolean isEditing = false;
-
-    private ServiceViewModel viewModel;
+    private ServiceDetailViewModel viewModel;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(ServiceViewModel.class);
+        viewModel = new ViewModelProvider(this).get(ServiceDetailViewModel.class);
     }
 
     @Override
@@ -53,78 +51,67 @@ public class ServiceDetailFragment extends Fragment {
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
 
-        //get controls from layout and display the view depending on the mode
         handleArguments();
 
-        //set button click listeners
         binding.btnBack.setOnClickListener(v -> navigateBack());
         binding.btnSaveService.setOnClickListener(v -> saveService());
         binding.btnDeleteService.setOnClickListener(v -> deleteService());
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Handles the saving of service data (adding or updating).
-     */
     private void saveService() {
-        // Validates all fields using InputValidator
         if (!InputValidator.isNotEmpty(binding.etServiceName, "Service Name")) return;
         if (!InputValidator.isNotEmpty(binding.etServiceDesc, "Description")) return;
         if (!InputValidator.isPositiveInteger(binding.etServiceDuration, "Duration")) return;
         if (!InputValidator.isPositiveDecimal(binding.etServicePrice, "Price")) return;
 
-        //get all the values from the fields
         String name = binding.etServiceName.getText().toString().trim();
         String desc = binding.etServiceDesc.getText().toString().trim();
         int duration = Integer.parseInt(binding.etServiceDuration.getText().toString().trim());
         double price = Double.parseDouble(binding.etServicePrice.getText().toString().trim());
 
-        //create a service object to send to the API
         ServiceDTO serviceDTO = new ServiceDTO();
         serviceDTO.setServiceName(name);
         serviceDTO.setServiceDesc(desc);
         serviceDTO.setServiceDuration(duration);
         serviceDTO.setServicePrice(price);
 
-        //check if the service is being edited or added
-        if (isEditing) {
-            // Update existing service
-            serviceDTO.setServiceId(serviceId);
-            viewModel.updateService(serviceId, serviceDTO).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    ActivityLogger.logChange(requireContext(), "Service", "UPDATED", (int) serviceId);
+        viewModel.saveService(serviceDTO).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS) {
+                if (viewModel.isEditing()) {
+                    ActivityLogger.logChange(requireContext(), "Service", "UPDATED", (int) viewModel.getServiceId());
                     Toast.makeText(getContext(), "Service updated successfully!", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        } else {
-            viewModel.createService(serviceDTO).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
+                } else {
                     ActivityLogger.log(requireContext(), "Added new Service: " + name);
                     Toast.makeText(getContext(), "Service added successfully!", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
                 }
-            });
-        }
+                navigateBack();
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
+            }
+        });
     }
 
-    /**
-     * Displays a confirmation dialog and handles the deletion of a service.
-     */
     private void deleteService() {
         DialogUtils.showDeleteConfirmDialog(requireContext(), "Service", () -> 
-                viewModel.deleteService(serviceId).observe(getViewLifecycleOwner(), resource -> {
+                viewModel.deleteService().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
                     if (resource.status == Resource.Status.SUCCESS) {
-                        ActivityLogger.logChange(requireContext(), "Service", "DELETED", (int) serviceId);
+                        ActivityLogger.logChange(requireContext(), "Service", "DELETED", (int) viewModel.getServiceId());
                         Toast.makeText(getContext(), "Service deleted successfully!", Toast.LENGTH_SHORT).show();
                         navigateBack();
                     } else if (resource.status == Resource.Status.ERROR) {
@@ -133,30 +120,20 @@ public class ServiceDetailFragment extends Fragment {
                 }));
     }
 
-    /**
-     * Navigates back to the previous screen.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }
 
-    /**
-     * Handles arguments passed to the fragment to determine if it's in edit or add mode.
-     */
     private void handleArguments() {
-        // Service is being edited if the bundle contains a serviceId
         if (getArguments() != null && getArguments().containsKey("serviceId")) {
-            // Get service data from arguments and populate fields
-            isEditing = true;
-            serviceId = getArguments().getLong("serviceId");
+            long serviceId = getArguments().getLong("serviceId");
+            viewModel.setServiceId(serviceId);
             binding.tvMode.setText("Edit Service");
-            binding.tvServiceId.setText("ID: " + serviceId);
+            binding.tvServiceId.setText(DateTimeUtils.formatId(serviceId));
             binding.btnDeleteService.setVisibility(View.VISIBLE);
             loadServiceData();
         } else {
-            // Service is being added
-            // Set default values for add a new service
-            isEditing = false;
+            viewModel.setServiceId(-1);
             binding.tvMode.setText("Add Service");
             binding.tvServiceId.setVisibility(View.GONE);
             binding.btnDeleteService.setVisibility(View.GONE);
@@ -164,12 +141,10 @@ public class ServiceDetailFragment extends Fragment {
         }
     }
 
-    /**
-     * Fetches specific service details from the backend using the ID.
-     */
     private void loadServiceData() {
-        viewModel.getServiceById(serviceId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadService().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 ServiceDTO s = resource.data;
                 binding.etServiceName.setText(s.getServiceName());

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/StaffDetailFragment.java

@@ -1,27 +1,28 @@
 package com.example.petstoremobile.fragments.listfragments.detailfragments;
 
 import android.os.Bundle;
-import android.util.Log;
 import android.view.*;
 import android.widget.*;
 import androidx.annotation.NonNull;
-import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.databinding.FragmentStaffDetailBinding;
 import com.example.petstoremobile.dtos.EmployeeDTO;
-import com.example.petstoremobile.viewmodels.EmployeeViewModel;
+import com.example.petstoremobile.utils.DialogUtils;
+import com.example.petstoremobile.utils.InputValidator;
+import com.example.petstoremobile.utils.SpinnerUtils;
+import com.example.petstoremobile.utils.UIUtils;
+import com.example.petstoremobile.viewmodels.StaffDetailViewModel;
+import com.example.petstoremobile.utils.Resource;
 import dagger.hilt.android.AndroidEntryPoint;
 
 @AndroidEntryPoint
 public class StaffDetailFragment extends Fragment {
 
     private FragmentStaffDetailBinding binding;
-    private EmployeeViewModel employeeViewModel;
-    private long employeeId = -1;
-    private boolean isEditing = false;
+    private StaffDetailViewModel viewModel;
 
     private final String[] ROLES = {"STAFF", "ADMIN"};
     private final String[] STATUSES = {"Active", "Inactive"};
@@ -30,7 +31,7 @@ public class StaffDetailFragment extends Fragment {
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         binding = FragmentStaffDetailBinding.inflate(inflater, container, false);
-        employeeViewModel = new ViewModelProvider(this).get(EmployeeViewModel.class);
+        viewModel = new ViewModelProvider(this).get(StaffDetailViewModel.class);
         
         setupSpinners();
         handleArguments();
@@ -38,21 +39,22 @@ public class StaffDetailFragment extends Fragment {
         binding.btnStaffBack.setOnClickListener(v -> navigateBack());
         binding.btnSaveStaff.setOnClickListener(v -> save());
         binding.btnDeleteStaff.setOnClickListener(v -> confirmDelete());
+        
+        UIUtils.formatPhoneInput(binding.etStaffPhone);
+        
         return binding.getRoot();
     }
 
     private void setupSpinners() {
-        binding.spinnerStaffRole.setAdapter(new ArrayAdapter<>(requireContext(),
-                android.R.layout.simple_spinner_item, ROLES));
-        binding.spinnerStaffStatus.setAdapter(new ArrayAdapter<>(requireContext(),
-                android.R.layout.simple_spinner_item, STATUSES));
+        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerStaffRole, ROLES);
+        SpinnerUtils.setupStringSpinner(requireContext(), binding.spinnerStaffStatus, STATUSES);
     }
 
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.getBoolean("isEditing", false)) {
-            isEditing = true;
-            employeeId = a.getLong("employeeId", -1);
+            long employeeId = a.getLong("employeeId", -1);
+            viewModel.setEmployeeId(employeeId, true);
 
             binding.tvStaffMode.setText("Edit Staff Account");
             binding.tvStaffId.setText("ID: " + employeeId);
@@ -64,52 +66,50 @@ public class StaffDetailFragment extends Fragment {
             binding.etStaffPhone.setText(a.getString("phone", ""));
             binding.btnDeleteStaff.setVisibility(View.VISIBLE);
 
-            // Pre-fill role
-            String role = a.getString("role", "STAFF");
-            for (int i = 0; i < ROLES.length; i++) {
-                if (ROLES[i].equals(role)) {
-                    binding.spinnerStaffRole.setSelection(i);
-                    break;
-                }
-            }
-
-            // Pre-fill status
-            boolean active = a.getBoolean("active", true);
-            binding.spinnerStaffStatus.setSelection(active ? 0 : 1);
+            SpinnerUtils.setSelectionByValue(binding.spinnerStaffRole, a.getString("role", "STAFF"));
+            binding.spinnerStaffStatus.setSelection(a.getBoolean("active", true) ? 0 : 1);
 
         } else {
-            isEditing = false;
-            employeeId = -1;
+            viewModel.setEmployeeId(-1, false);
             binding.tvStaffMode.setText("Add Staff Account");
             binding.btnDeleteStaff.setVisibility(View.GONE);
             binding.tvStaffId.setVisibility(View.GONE);
         }
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
 
     private void save() {
-        String username  = binding.etStaffUsername.getText() != null ? binding.etStaffUsername.getText().toString().trim() : "";
-        String password  = binding.etStaffPassword.getText() != null ? binding.etStaffPassword.getText().toString().trim() : "";
-        String firstName = binding.etStaffFirstName.getText() != null ? binding.etStaffFirstName.getText().toString().trim() : "";
-        String lastName  = binding.etStaffLastName.getText() != null ? binding.etStaffLastName.getText().toString().trim() : "";
-        String email     = binding.etStaffEmail.getText() != null ? binding.etStaffEmail.getText().toString().trim() : "";
-        String phone     = binding.etStaffPhone.getText() != null ? binding.etStaffPhone.getText().toString().trim() : "";
+        if (!InputValidator.isNotEmpty(binding.etStaffUsername, "Username")) return;
+        
+        if (!viewModel.isEditing()) {
+            if (!InputValidator.isNotEmpty(binding.etStaffPassword, "Password")) return;
+            String pass = binding.etStaffPassword.getText().toString();
+            if (pass.length() < 6) {
+                binding.etStaffPassword.setError("At least 6 characters");
+                binding.etStaffPassword.requestFocus();
+                return;
+            }
+        }
+        
+        if (!InputValidator.isNotEmpty(binding.etStaffFirstName, "First Name")) return;
+        if (!InputValidator.isNotEmpty(binding.etStaffLastName, "Last Name")) return;
+        if (!InputValidator.isValidEmail(binding.etStaffEmail)) return;
+        if (!InputValidator.isValidPhone(binding.etStaffPhone)) return;
+
+        String username  = binding.etStaffUsername.getText().toString().trim();
+        String password  = binding.etStaffPassword.getText().toString().trim();
+        String firstName = binding.etStaffFirstName.getText().toString().trim();
+        String lastName  = binding.etStaffLastName.getText().toString().trim();
+        String email     = binding.etStaffEmail.getText().toString().trim();
+        String phone     = binding.etStaffPhone.getText().toString().trim();
         String role      = ROLES[binding.spinnerStaffRole.getSelectedItemPosition()];
         boolean active   = binding.spinnerStaffStatus.getSelectedItemPosition() == 0;
 
-        // Validation
-        if (username.isEmpty()) { binding.etStaffUsername.setError("Required"); return; }
-        if (!isEditing && password.isEmpty()) {
-            binding.etStaffPassword.setError("Required for new account"); return;
-        }
-        if (!isEditing && password.length() < 6) {
-            binding.etStaffPassword.setError("At least 6 characters"); return;
-        }
-        if (firstName.isEmpty()) { binding.etStaffFirstName.setError("Required"); return; }
-        if (lastName.isEmpty()) { binding.etStaffLastName.setError("Required"); return; }
-        if (email.isEmpty()) { binding.etStaffEmail.setError("Required"); return; }
-        if (phone.isEmpty()) { binding.etStaffPhone.setError("Required"); return; }
-
         EmployeeDTO dto = new EmployeeDTO(
                 username,
                 password.isEmpty() ? null : password,
@@ -121,56 +121,32 @@ public class StaffDetailFragment extends Fragment {
                 active
         );
 
-        if (isEditing && employeeId > 0) {
-            employeeViewModel.updateEmployee(employeeId, dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource != null) {
-                    switch (resource.status) {
-                        case SUCCESS:
-                            Toast.makeText(getContext(), "Updated successfully", Toast.LENGTH_SHORT).show();
-                            navigateBack();
-                            break;
-                        case ERROR:
-                            Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_LONG).show();
-                            break;
-                    }
+        viewModel.saveEmployee(dto).observe(getViewLifecycleOwner(), resource -> {
+            if (resource != null) {
+                setLoading(resource.status == Resource.Status.LOADING);
+                if (resource.status == Resource.Status.SUCCESS) {
+                    Toast.makeText(getContext(), viewModel.isEditing() ? "Updated successfully" : "Staff account created", Toast.LENGTH_SHORT).show();
+                    navigateBack();
+                } else if (resource.status == Resource.Status.ERROR) {
+                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_LONG).show();
                 }
-            });
-        } else {
-            employeeViewModel.createEmployee(dto).observe(getViewLifecycleOwner(), resource -> {
-                if (resource != null) {
-                    switch (resource.status) {
-                        case SUCCESS:
-                            Toast.makeText(getContext(), "Staff account created", Toast.LENGTH_SHORT).show();
-                            navigateBack();
-                            break;
-                        case ERROR:
-                            Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_LONG).show();
-                            break;
-                    }
-                }
-            });
-        }
+            }
+        });
     }
 
     private void confirmDelete() {
-        new AlertDialog.Builder(requireContext())
-                .setTitle("Delete Staff Account?")
-                .setMessage("This will permanently delete this staff account.")
-                .setPositiveButton("Yes", (d, w) ->
-                        employeeViewModel.deleteEmployee(employeeId).observe(getViewLifecycleOwner(), resource -> {
-                            if (resource != null) {
-                                switch (resource.status) {
-                                    case SUCCESS:
-                                        navigateBack();
-                                        break;
-                                    case ERROR:
-                                        Toast.makeText(getContext(), "Delete failed: " + resource.message,
-                                                Toast.LENGTH_SHORT).show();
-                                        break;
-                                }
-                            }
-                        }))
-                .setNegativeButton("No", null).show();
+        DialogUtils.showDeleteConfirmDialog(requireContext(), "Staff Account", () ->
+                viewModel.deleteEmployee().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource != null) {
+                        setLoading(resource.status == Resource.Status.LOADING);
+                        if (resource.status == Resource.Status.SUCCESS) {
+                            navigateBack();
+                        } else if (resource.status == Resource.Status.ERROR) {
+                            Toast.makeText(getContext(), "Delete failed: " + resource.message,
+                                    Toast.LENGTH_SHORT).show();
+                        }
+                    }
+                }));
     }
 
     private void navigateBack() {

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/SupplierDetailFragment.java

@@ -20,7 +20,7 @@ import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
 import com.example.petstoremobile.utils.UIUtils;
-import com.example.petstoremobile.viewmodels.SupplierViewModel;
+import com.example.petstoremobile.viewmodels.SupplierDetailViewModel;
 
 import dagger.hilt.android.AndroidEntryPoint;
 
@@ -31,15 +31,12 @@ import dagger.hilt.android.AndroidEntryPoint;
 public class SupplierDetailFragment extends Fragment {
 
     private FragmentSupplierDetailBinding binding;
-    private long supId;
-    private boolean isEditing = false;
-
-    private SupplierViewModel viewModel;
+    private SupplierDetailViewModel viewModel;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(SupplierViewModel.class);
+        viewModel = new ViewModelProvider(this).get(SupplierDetailViewModel.class);
     }
 
     @Override
@@ -53,42 +50,39 @@ public class SupplierDetailFragment extends Fragment {
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
 
-        // Add phone number formatting (CA) and limit length to 14 characters
         UIUtils.formatPhoneInput(binding.etSupPhone);
-
         handleArguments();
 
-        //set button click listeners
         binding.btnBack.setOnClickListener(v -> navigateBack());
         binding.btnSaveSupplier.setOnClickListener(v -> saveSupplier());
         binding.btnDeleteSupplier.setOnClickListener(v -> deleteSupplier());
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Handles the saving of supplier data (adding or updating).
-     */
     private void saveSupplier() {
-        // Validates all fields using InputValidator
         if (!InputValidator.isNotEmpty(binding.etSupCompany, "Company Name")) return;
         if (!InputValidator.isNotEmpty(binding.etSupContactFirstName, "First Name")) return;
         if (!InputValidator.isNotEmpty(binding.etSupContactLastName, "Last Name")) return;
         if (!InputValidator.isValidEmail(binding.etSupEmail)) return;
         if (!InputValidator.isValidPhone(binding.etSupPhone)) return;
 
-        //get all the values from the fields
         String company = binding.etSupCompany.getText().toString().trim();
         String firstName = binding.etSupContactFirstName.getText().toString().trim();
         String lastName = binding.etSupContactLastName.getText().toString().trim();
         String email = binding.etSupEmail.getText().toString().trim();
         String phone = binding.etSupPhone.getText().toString().trim();
 
-        //create a supplier object to send to the API
         SupplierDTO supplierDTO = new SupplierDTO();
         supplierDTO.setSupCompany(company);
         supplierDTO.setSupContactFirstName(firstName);
@@ -96,41 +90,31 @@ public class SupplierDetailFragment extends Fragment {
         supplierDTO.setSupEmail(email);
         supplierDTO.setSupPhone(phone);
 
-        //check if the supplier is being edited or added
-        if (isEditing) {
-            // Update existing supplier
-            supplierDTO.setSupId(supId);
-            viewModel.updateSupplier(supId, supplierDTO).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    ActivityLogger.logChange(requireContext(), "Supplier", "UPDATED", (int) supId);
+        viewModel.saveSupplier(supplierDTO).observe(getViewLifecycleOwner(), resource -> {
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS) {
+                if (viewModel.isEditing()) {
+                    ActivityLogger.logChange(requireContext(), "Supplier", "UPDATED", (int) viewModel.getSupId());
                     Toast.makeText(getContext(), "Supplier updated successfully!", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
-            });
-        } else {
-            // Add new supplier
-            viewModel.createSupplier(supplierDTO).observe(getViewLifecycleOwner(), resource -> {
-                if (resource.status == Resource.Status.SUCCESS) {
+                } else {
                     ActivityLogger.log(requireContext(), "Added new Supplier: " + company);
                     Toast.makeText(getContext(), "Supplier added successfully!", Toast.LENGTH_SHORT).show();
-                    navigateBack();
-                } else if (resource.status == Resource.Status.ERROR) {
-                    Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
                 }
-            });
-        }
+                navigateBack();
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(getContext(), "Error: " + resource.message, Toast.LENGTH_SHORT).show();
+            }
+        });
     }
 
-    /**
-     * Displays a confirmation dialog and handles the deletion of a supplier.
-     */
     private void deleteSupplier() {
         DialogUtils.showDeleteConfirmDialog(requireContext(), "Supplier", () ->
-                viewModel.deleteSupplier(supId).observe(getViewLifecycleOwner(), resource -> {
+                viewModel.deleteSupplier().observe(getViewLifecycleOwner(), resource -> {
+                    if (resource == null) return;
+                    setLoading(resource.status == Resource.Status.LOADING);
                     if (resource.status == Resource.Status.SUCCESS) {
-                        ActivityLogger.logChange(requireContext(), "Supplier", "DELETED", (int) supId);
+                        ActivityLogger.logChange(requireContext(), "Supplier", "DELETED", (int) viewModel.getSupId());
                         Toast.makeText(getContext(), "Supplier deleted successfully!", Toast.LENGTH_SHORT).show();
                         navigateBack();
                     } else if (resource.status == Resource.Status.ERROR) {
@@ -139,31 +123,21 @@ public class SupplierDetailFragment extends Fragment {
                 }));
     }
 
-    /**
-     * Navigates back to the previous screen.
-     */
     private void navigateBack() {
         NavHostFragment.findNavController(this).popBackStack();
     }
 
-    /**
-     * Handles arguments passed to the fragment to determine if it's in edit or add mode.
-     */
     private void handleArguments() {
-        // Supplier is being edited if the bundle contains a supId
         if (getArguments() != null && getArguments().containsKey("supId")) {
-            // Get supplier data from arguments and populate fields
-            isEditing = true;
-            supId = getArguments().getLong("supId");
+            long supId = getArguments().getLong("supId");
+            viewModel.setSupId(supId);
             binding.tvMode.setText("Edit Supplier");
             binding.tvSupId.setText("ID: " + supId);
             binding.tvSupId.setVisibility(View.VISIBLE);
             binding.btnDeleteSupplier.setVisibility(View.VISIBLE);
             loadSupplierData();
         } else {
-            // Supplier is being added
-            // Set default values for add a new supplier
-            isEditing = false;
+            viewModel.setSupId(-1);
             binding.tvMode.setText("Add Supplier");
             binding.tvSupId.setVisibility(View.GONE);
             binding.btnDeleteSupplier.setVisibility(View.GONE);
@@ -171,12 +145,10 @@ public class SupplierDetailFragment extends Fragment {
         }
     }
 
-    /**
-     * Fetches specific supplier details from the backend using the ID.
-     */
     private void loadSupplierData() {
-        viewModel.getSupplierById(supId).observe(getViewLifecycleOwner(), resource -> {
+        viewModel.loadSupplier().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 SupplierDTO s = resource.data;
                 binding.etSupCompany.setText(s.getSupCompany());

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/listprofilefragments/PetProfileFragment.java

@@ -23,7 +23,7 @@ import com.example.petstoremobile.utils.FileUtils;
 import com.example.petstoremobile.utils.GlideUtils;
 import com.example.petstoremobile.utils.ImagePickerHelper;
 import com.example.petstoremobile.utils.Resource;
-import com.example.petstoremobile.viewmodels.PetViewModel;
+import com.example.petstoremobile.viewmodels.PetProfileViewModel;
 
 import java.io.File;
 import java.util.Locale;
@@ -46,17 +46,13 @@ public class PetProfileFragment extends Fragment {
     @Inject @Named("baseUrl") String baseUrl;
     @Inject TokenManager tokenManager;
 
-    private PetViewModel viewModel;
+    private PetProfileViewModel viewModel;
     private ImagePickerHelper imagePickerHelper;
 
-
-    /**
-     * Initializes activity launchers for gallery, camera, and permissions.
-     */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        viewModel = new ViewModelProvider(this).get(PetViewModel.class);
+        viewModel = new ViewModelProvider(this).get(PetProfileViewModel.class);
 
         imagePickerHelper = new ImagePickerHelper(this, "pet_photo.jpg", new ImagePickerHelper.ImagePickerListener() {
             @Override
@@ -71,34 +67,27 @@ public class PetProfileFragment extends Fragment {
         });
     }
 
-    /**
-     * Inflates the layout using view binding, initializes views, and sets up click listeners.
-     */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         binding = FragmentPetProfileBinding.inflate(inflater, container, false);
 
-        // Set pet details to display
         if (getArguments() != null) {
             petId = getArguments().getLong("petId");
             loadPetData();
             loadPetImage((int) petId);
         }
 
-        //set button click listeners
         binding.btnBack.setOnClickListener(v -> {
             NavHostFragment.findNavController(this).popBackStack();
         });
 
-        //Make the edit button go to the pet detail view
         binding.btnEditPet.setOnClickListener(v -> {
             Bundle args = new Bundle();
             args.putLong("petId", petId);
             NavHostFragment.findNavController(this).navigate(R.id.nav_pet_detail, args);
         });
 
-        //Make change photo button ask user to select a new photo
         binding.btnChangePhoto.setOnClickListener(v -> {
             imagePickerHelper.showImagePickerDialog("Change Pet Photo", hasImage);
         });
@@ -106,18 +95,22 @@ public class PetProfileFragment extends Fragment {
         return binding.getRoot();
     }
 
+    private void setLoading(boolean loading) {
+        if (binding != null && binding.progressBar != null) {
+            binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
+        }
+    }
+
     @Override
     public void onDestroyView() {
         super.onDestroyView();
         binding = null;
     }
 
-    /**
-     * Fetches current pet data from the backend and updates the UI.
-     */
     private void loadPetData() {
         viewModel.getPetById(petId).observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 PetDTO pet = resource.data;
                 binding.tvPetName.setText(pet.getPetName());
@@ -133,7 +126,6 @@ public class PetProfileFragment extends Fragment {
 
                 String status = pet.getPetStatus();
 
-                // Display owner name only if the pet is Adopted or Owned
                 if ("Adopted".equalsIgnoreCase(status) || "Owned".equalsIgnoreCase(status)) {
                     binding.layoutPetOwner.setVisibility(View.VISIBLE);
                     if (pet.getCustomerName() != null && !pet.getCustomerName().isEmpty()) {
@@ -145,7 +137,6 @@ public class PetProfileFragment extends Fragment {
                     binding.layoutPetOwner.setVisibility(View.GONE);
                 }
 
-                // Display store name only if the pet is Adopted or Available
                 if ("Available".equalsIgnoreCase(status) || "Adopted".equalsIgnoreCase(status)) {
                     binding.layoutPetStore.setVisibility(View.VISIBLE);
                     if (pet.getStoreName() != null && !pet.getStoreName().isEmpty()) {
@@ -162,9 +153,6 @@ public class PetProfileFragment extends Fragment {
         });
     }
 
-    /**
-     * Fetches and displays the pet\'s image from the server.
-     */
     private void loadPetImage(int petId) {
         String imageUrl = baseUrl + String.format(Locale.US, PetApi.PET_IMAGE_PATH, petId);
         String token = tokenManager.getToken();
@@ -182,27 +170,22 @@ public class PetProfileFragment extends Fragment {
         });
     }
 
-    /**
-     * Uploads a selected or captured image a pet photo through the ViewModel.
-     */
     private void uploadPetImage(Uri uri) {
         try {
             File file = FileUtils.getFileFromUri(requireContext(), uri);
             if (file == null) return;
 
-            // Create RequestBody for file upload
             RequestBody requestFile = RequestBody.create(file, MediaType.parse(requireContext().getContentResolver().getType(uri)));
             MultipartBody.Part body = MultipartBody.Part.createFormData("image", file.getName(), requestFile);
 
-            // Use ViewModel to upload image
             viewModel.uploadPetImage(petId, body).observe(getViewLifecycleOwner(), resource -> {
-                if (resource != null && resource.status != Resource.Status.LOADING) {
-                    if (resource.status == Resource.Status.SUCCESS) {
-                        Toast.makeText(getContext(), "Pet photo updated successfully", Toast.LENGTH_SHORT).show();
-                        loadPetImage((int) petId);
-                    } else {
-                        Toast.makeText(getContext(), "Upload failed: " + resource.message, Toast.LENGTH_SHORT).show();
-                    }
+                if (resource == null) return;
+                setLoading(resource.status == Resource.Status.LOADING);
+                if (resource.status == Resource.Status.SUCCESS) {
+                    Toast.makeText(getContext(), "Pet photo updated successfully", Toast.LENGTH_SHORT).show();
+                    loadPetImage((int) petId);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    Toast.makeText(getContext(), "Upload failed: " + resource.message, Toast.LENGTH_SHORT).show();
                 }
             });
         } catch (Exception e) {
@@ -210,19 +193,16 @@ public class PetProfileFragment extends Fragment {
         }
     }
 
-    /**
-     * Sends a request to the ViewModel to remove the current pet photo.
-     */
     private void deletePetImage() {
         viewModel.deletePetImage(petId).observe(getViewLifecycleOwner(), resource -> {
-            if (resource != null && resource.status != Resource.Status.LOADING) {
-                if (resource.status == Resource.Status.SUCCESS) {
-                    Toast.makeText(getContext(), "Pet photo removed", Toast.LENGTH_SHORT).show();
-                    hasImage = false;
-                    binding.imgPet.setImageResource(R.drawable.placeholder);
-                } else {
-                    Toast.makeText(getContext(), "Delete failed: " + resource.message, Toast.LENGTH_SHORT).show();
-                }
+            if (resource == null) return;
+            setLoading(resource.status == Resource.Status.LOADING);
+            if (resource.status == Resource.Status.SUCCESS) {
+                Toast.makeText(getContext(), "Pet photo removed", Toast.LENGTH_SHORT).show();
+                hasImage = false;
+                binding.imgPet.setImageResource(R.drawable.placeholder);
+            } else if (resource.status == Resource.Status.ERROR) {
+                Toast.makeText(getContext(), "Delete failed: " + resource.message, Toast.LENGTH_SHORT).show();
             }
         });
     }

android/app/src/main/java/com/example/petstoremobile/models/Chat.java

@@ -6,13 +6,15 @@ public class Chat {
     private String lastMessage;
     private Long customerId;
     private Long staffId;
+    private String status;
 
-    public Chat(String chatId, String customerName, String lastMessage, Long customerId, Long staffId) {
+    public Chat(String chatId, String customerName, String lastMessage, Long customerId, Long staffId, String status) {
         this.chatId = chatId;
         this.customerName = customerName;
         this.lastMessage = lastMessage;
         this.customerId = customerId;
         this.staffId = staffId;
+        this.status = status;
     }
 
     public String getChatId() {
@@ -34,4 +36,8 @@ public class Chat {
     public Long getStaffId() {
         return staffId;
     }
+
+    public String getStatus() {
+        return status;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/models/Message.java

@@ -9,7 +9,8 @@ public class Message {
     private Boolean isRead;
     private String attachmentUrl;
     private String attachmentName;
-    private String attachmentType;
+    private String attachmentMimeType;
+    private Long attachmentSizeBytes;
 
     public Message() {}
 
@@ -43,6 +44,9 @@ public class Message {
     public String getAttachmentName() { return attachmentName; }
     public void setAttachmentName(String attachmentName) { this.attachmentName = attachmentName; }
 
-    public String getAttachmentType() { return attachmentType; }
-    public void setAttachmentType(String attachmentType) { this.attachmentType = attachmentType; }
+    public String getAttachmentMimeType() { return attachmentMimeType; }
+    public void setAttachmentMimeType(String attachmentMimeType) { this.attachmentMimeType = attachmentMimeType; }
+
+    public Long getAttachmentSizeBytes() { return attachmentSizeBytes; }
+    public void setAttachmentSizeBytes(Long attachmentSizeBytes) { this.attachmentSizeBytes = attachmentSizeBytes; }
 }

android/app/src/main/java/com/example/petstoremobile/repositories/ChatRepository.java

@@ -17,6 +17,10 @@ import java.util.List;
 import javax.inject.Inject;
 import javax.inject.Singleton;
 
+import okhttp3.MultipartBody;
+import okhttp3.RequestBody;
+import okhttp3.ResponseBody;
+
 /**
  * Repository for handling chat-related data operations.
  */
@@ -55,6 +59,20 @@ public class ChatRepository extends BaseRepository {
         return executeCall(messageApi.sendMessage(conversationId, request));
     }
 
+    /**
+     * Sends a message with an attachment.
+     */
+    public LiveData<Resource<MessageDTO>> sendMessageWithAttachment(Long conversationId, MultipartBody.Part content, MultipartBody.Part attachment) {
+        return executeCall(messageApi.sendMessageWithAttachment(conversationId, content, attachment));
+    }
+
+    /**
+     * Downloads an attachment for a specific message.
+     */
+    public LiveData<Resource<ResponseBody>> downloadAttachment(Long messageId) {
+        return executeCall(messageApi.downloadAttachment(messageId));
+    }
+
     /**
      * Fetches a paginated list of customers.
      */

android/app/src/main/java/com/example/petstoremobile/repositories/CustomerRepository.java

@@ -4,9 +4,12 @@ import androidx.lifecycle.LiveData;
 
 import com.example.petstoremobile.api.CustomerApi;
 import com.example.petstoremobile.dtos.CustomerDTO;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PageResponse;
 import com.example.petstoremobile.utils.Resource;
 
+import java.util.List;
+
 import javax.inject.Inject;
 import javax.inject.Singleton;
 
@@ -33,4 +36,11 @@ public class CustomerRepository extends BaseRepository {
     public LiveData<Resource<CustomerDTO>> getCustomerById(Long id) {
         return executeCall(customerApi.getCustomerById(id));
     }
-}
+
+    /**
+     * Retrieves a list of customer dropdowns from the API.
+     */
+    public LiveData<Resource<List<DropdownDTO>>> getCustomerDropdowns() {
+        return executeCall(customerApi.getCustomerDropdowns());
+    }
+}

android/app/src/main/java/com/example/petstoremobile/repositories/PetRepository.java

@@ -4,10 +4,13 @@ import androidx.lifecycle.LiveData;
 
 import com.example.petstoremobile.api.PetApi;
 import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PageResponse;
 import com.example.petstoremobile.dtos.PetDTO;
 import com.example.petstoremobile.utils.Resource;
 
+import java.util.List;
+
 import javax.inject.Inject;
 import javax.inject.Singleton;
 
@@ -26,8 +29,22 @@ public class PetRepository extends BaseRepository {
     /**
      * Retrieves a paginated list of pets from the API with optional filters.
      */
-    public LiveData<Resource<PageResponse<PetDTO>>> getAllPets(int page, int size, String query, String status, String species, Long storeId, String sort) {
-        return executeCall(petApi.getAllPets(page, size, query, status, species, storeId, sort));
+    public LiveData<Resource<PageResponse<PetDTO>>> getAllPets(int page, int size, String query, String status, String species, Long storeId, Long customerId, String sort) {
+        return executeCall(petApi.getAllPets(page, size, query, status, species, storeId, customerId, sort));
+    }
+
+    /**
+     * Retrieves a list of pets for a specific customer from the dropdowns API.
+     */
+    public LiveData<Resource<List<DropdownDTO>>> getCustomerPets(Long customerId) {
+        return executeCall(petApi.getCustomerPets(customerId));
+    }
+
+    /**
+     * Retrieves a list of pets available for adoption from the dropdowns API.
+     */
+    public LiveData<Resource<List<DropdownDTO>>> getAdoptionPets() {
+        return executeCall(petApi.getAdoptionPets());
     }
 
     /**

android/app/src/main/java/com/example/petstoremobile/repositories/StoreRepository.java

@@ -3,10 +3,13 @@ package com.example.petstoremobile.repositories;
 import androidx.lifecycle.LiveData;
 
 import com.example.petstoremobile.api.StoreApi;
+import com.example.petstoremobile.dtos.DropdownDTO;
 import com.example.petstoremobile.dtos.PageResponse;
 import com.example.petstoremobile.dtos.StoreDTO;
 import com.example.petstoremobile.utils.Resource;
 
+import java.util.List;
+
 import javax.inject.Inject;
 import javax.inject.Singleton;
 
@@ -26,4 +29,18 @@ public class StoreRepository extends BaseRepository {
     public LiveData<Resource<PageResponse<StoreDTO>>> getAllStores(int page, int size) {
         return executeCall(storeApi.getAllStores(page, size));
     }
+
+    /**
+     * Retrieves a list of store dropdowns from the API.
+     */
+    public LiveData<Resource<List<DropdownDTO>>> getStoreDropdowns() {
+        return executeCall(storeApi.getStoreDropdowns());
+    }
+
+    /**
+     * Retrieves a list of employees for a specific store from the dropdowns API.
+     */
+    public LiveData<Resource<List<DropdownDTO>>> getStoreEmployees(Long storeId) {
+        return executeCall(storeApi.getStoreEmployees(storeId));
+    }
 }

android/app/src/main/java/com/example/petstoremobile/utils/DateTimeUtils.java

@@ -0,0 +1,113 @@
+package com.example.petstoremobile.utils;
+
+import android.util.Log;
+
+import java.util.Calendar;
+import java.util.Locale;
+
+/**
+ * Utility class for date and time operations.
+ */
+public class DateTimeUtils {
+
+    private static final String TAG = "DateTimeUtils";
+
+    /**
+     * Formats status from backend format to UI format
+     * (backend is using all caps so we lower case them with this function)
+     */
+    public static String formatStatusFromBackend(String status) {
+        if (status == null || status.isEmpty()) return status;
+        return status.substring(0, 1).toUpperCase() + status.substring(1).toLowerCase();
+    }
+
+    /**
+     * Converts a date and time string to a Calendar object.
+     * format: date = "YYYY-MM-DD", time = "HH:MM"
+     */
+    public static Calendar parseDateTimeToCalendar(String date, String time) throws Exception {
+        Calendar calendar = Calendar.getInstance();
+        String[] dateParts = date.split("-");
+        String[] timeParts = time.split(":");
+
+        calendar.set(
+                Integer.parseInt(dateParts[0]),
+                Integer.parseInt(dateParts[1]) - 1,
+                Integer.parseInt(dateParts[2]),
+                Integer.parseInt(timeParts[0]),
+                Integer.parseInt(timeParts[1]),
+                0
+        );
+        return calendar;
+    }
+
+    /**
+     * Checks if a given date is in the past.
+     * format: date = "YYYY-MM-DD"
+     */
+    public static boolean isDateInPast(String date) {
+        if (date == null || date.isEmpty()) return false;
+        try {
+            Calendar selected = Calendar.getInstance();
+            String[] dateParts = date.split("-");
+            selected.set(
+                    Integer.parseInt(dateParts[0]),
+                    Integer.parseInt(dateParts[1]) - 1,
+                    Integer.parseInt(dateParts[2]),
+                    0, 0, 0
+            );
+            return selected.before(Calendar.getInstance());
+        } catch (Exception e) {
+            Log.e(TAG, "Error parsing date: " + e.getMessage());
+            return false;
+        }
+    }
+
+    /**
+     * Checks if a given date and time are in the past.
+     * format: date = "YYYY-MM-DD", time = "HH:MM"
+     */
+    public static boolean isDateTimeInPast(String date, String time) {
+        if (date == null || date.isEmpty() || time == null || time.isEmpty()) return false;
+        try {
+            Calendar selected = parseDateTimeToCalendar(date, time);
+            return selected.before(Calendar.getInstance());
+        } catch (Exception e) {
+            Log.e(TAG, "Error parsing date/time: " + e.getMessage());
+            return false;
+        }
+    }
+
+    /**
+     * Parses a time string and returns hour and minute values.
+     */
+    public static int[] parseTimeString(String time) {
+        if (time == null || time.isEmpty()) return null;
+        if (time.length() > 5) time = time.substring(0, 5);
+
+        String[] parts = time.split(":");
+        if (parts.length != 2) return null;
+
+        try {
+            int hour = Integer.parseInt(parts[0]);
+            int min = Integer.parseInt(parts[1]);
+            return new int[]{hour, min};
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+
+    /**
+     * Formats an hour and minute into an HH:mm string.
+     */
+    public static String formatTime(int hour, int minute) {
+        return String.format(Locale.getDefault(), "%02d:%02d", hour, minute);
+    }
+
+    /**
+     * Formats an ID for display (e.g., "ID: 123").
+     */
+    public static String formatId(long id) {
+        return String.format(Locale.getDefault(), "ID: %d", id);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/utils/FileUtils.java

@@ -1,7 +1,9 @@
 package com.example.petstoremobile.utils;
 
 import android.content.Context;
+import android.database.Cursor;
 import android.net.Uri;
+import android.provider.OpenableColumns;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.InputStream;
@@ -9,8 +11,11 @@ import java.io.InputStream;
 public class FileUtils {
     public static File getFileFromUri(Context context, Uri uri) {
         try {
+            String fileName = getFileName(context, uri);
+            if (fileName == null) fileName = "upload_" + System.currentTimeMillis();
+            
             InputStream inputStream = context.getContentResolver().openInputStream(uri);
-            File tempFile = new File(context.getCacheDir(), "upload_image_" + System.currentTimeMillis() + ".jpg");
+            File tempFile = new File(context.getCacheDir(), fileName);
             FileOutputStream outputStream = new FileOutputStream(tempFile);
             byte[] buffer = new byte[1024];
             int length;
@@ -24,4 +29,22 @@ public class FileUtils {
             return null;
         }
     }
+
+    public static String getFileName(Context context, Uri uri) {
+        String result = null;
+        if (uri.getScheme().equals("content")) {
+            try (Cursor cursor = context.getContentResolver().query(uri, null, null, null, null)) {
+                if (cursor != null && cursor.moveToFirst()) {
+                    int index = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
+                    if (index != -1) result = cursor.getString(index);
+                }
+            }
+        }
+        if (result == null) {
+            result = uri.getPath();
+            int cut = result.lastIndexOf('/');
+            if (cut != -1) result = result.substring(cut + 1);
+        }
+        return result;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/utils/SpinnerUtils.java

@@ -10,8 +10,10 @@ import com.example.petstoremobile.adapters.BlackTextArrayAdapter;
 import com.example.petstoremobile.adapters.WhiteTextArrayAdapter;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
+import java.util.function.Consumer;
 import java.util.function.Function;
 
 /**
@@ -50,6 +52,12 @@ public class SpinnerUtils {
             names.add(nameExtractor.apply(item));
         }
 
+        // Only update adapter if contents changed to remove infinite loop when spinner is opened
+        if (isAdapterDataSame(spinner, names)) {
+            setSelectedId(spinner, data, defaultText, preselectedId, idExtractor);
+            return;
+        }
+
         ArrayAdapter<String> adapter;
         if (useWhiteText) {
             adapter = new WhiteTextArrayAdapter<>(context, android.R.layout.simple_spinner_item, names);
@@ -60,26 +68,41 @@ public class SpinnerUtils {
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
         spinner.setAdapter(adapter);
 
+        setSelectedId(spinner, data, defaultText, preselectedId, idExtractor);
+    }
+
+    private static <T> void setSelectedId(Spinner spinner, List<T> data, String defaultText, Long preselectedId, Function<T, Long> idExtractor) {
         if (preselectedId != null && preselectedId != -1) {
             int offset = (defaultText != null) ? 1 : 0;
             for (int i = 0; i < data.size(); i++) {
                 Long currentId = idExtractor.apply(data.get(i));
                 if (Objects.equals(currentId, preselectedId)) {
-                    spinner.setSelection(i + offset);
+                    if (spinner.getSelectedItemPosition() != i + offset) {
+                        spinner.setSelection(i + offset);
+                    }
                     break;
                 }
             }
         }
     }
 
+    /**
+     * Checks if the adapter data is the same as the new data.
+     */
+    private static boolean isAdapterDataSame(Spinner spinner, List<String> newNames) {
+        if (spinner.getAdapter() == null) return false;
+        if (spinner.getAdapter().getCount() != newNames.size()) return false;
+        for (int i = 0; i < newNames.size(); i++) {
+            if (!Objects.equals(spinner.getAdapter().getItem(i), newNames.get(i))) return false;
+        }
+        return true;
+    }
+
     /**
      * Sets up a simple string spinner for filtering with a callback.
      */
     public static void setupStringFilterSpinner(Context context, Spinner spinner, String[] items, Runnable onSelectionChanged) {
-        WhiteTextArrayAdapter<String> adapter = new WhiteTextArrayAdapter<>(context,
-                android.R.layout.simple_spinner_item, items);
-        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
-        spinner.setAdapter(adapter);
+        updateStringSpinnerIfChanged(context, spinner, items, true);
         setupFilterSpinner(spinner, onSelectionChanged);
     }
 
@@ -96,6 +119,13 @@ public class SpinnerUtils {
         });
     }
 
+    /**
+     * Sets a listener that provides the selected index to a consumer.
+     */
+    public static void setOnIndexSelectedListener(Spinner spinner, Consumer<Integer> callback) {
+        spinner.setOnItemSelectedListener(new OnIndexSelected(callback));
+    }
+
     /**
      * Sets the selection of a spinner based on a string value.
      */
@@ -103,18 +133,65 @@ public class SpinnerUtils {
         if (value == null || spinner.getAdapter() == null) return;
         ArrayAdapter<String> adapter = (ArrayAdapter<String>) spinner.getAdapter();
         int pos = adapter.getPosition(value);
-        if (pos >= 0) {
+        if (pos >= 0 && spinner.getSelectedItemPosition() != pos) {
             spinner.setSelection(pos);
         }
     }
 
+    /**
+     * Sets the selection of a spinner based on a value within an array.
+     */
+    public static <T> void setSelectionByValueArray(Spinner spinner, T[] array, T value) {
+        if (spinner == null || array == null || value == null) return;
+        for (int i = 0; i < array.length; i++) {
+            if (Objects.equals(array[i], value)) {
+                if (spinner.getSelectedItemPosition() != i) {
+                    spinner.setSelection(i);
+                }
+                return;
+            }
+        }
+    }
+
     /**
      * Configures a simple string array spinner.
      */
     public static void setupStringSpinner(Context context, Spinner spinner, String[] items) {
-        BlackTextArrayAdapter<String> adapter = new BlackTextArrayAdapter<>(context,
-                android.R.layout.simple_spinner_item, items);
+        updateStringSpinnerIfChanged(context, spinner, items, false);
+    }
+
+    /**
+     * Updates a string spinner only if the items have changed.
+     */
+    public static void updateStringSpinnerIfChanged(Context context, Spinner spinner, String[] items, boolean useWhiteText) {
+        if (isAdapterDataSame(spinner, Arrays.asList(items))) return;
+
+        ArrayAdapter<String> adapter;
+        if (useWhiteText) {
+            adapter = new WhiteTextArrayAdapter<>(context, android.R.layout.simple_spinner_item, items);
+        } else {
+            adapter = new BlackTextArrayAdapter<>(context, android.R.layout.simple_spinner_item, items);
+        }
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
         spinner.setAdapter(adapter);
     }
+
+    /**
+     * Helper listener to get selected index from a spinner.
+     */
+    public static class OnIndexSelected implements AdapterView.OnItemSelectedListener {
+        private final Consumer<Integer> callback;
+
+        public OnIndexSelected(Consumer<Integer> callback) {
+            this.callback = callback;
+        }
+
+        @Override
+        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+            callback.accept(position);
+        }
+
+        @Override
+        public void onNothingSelected(AdapterView<?> parent) {}
+    }
 }

android/app/src/main/java/com/example/petstoremobile/utils/UIUtils.java

@@ -1,5 +1,7 @@
 package com.example.petstoremobile.utils;
 
+import android.app.DatePickerDialog;
+import android.content.Context;
 import android.telephony.PhoneNumberFormattingTextWatcher;
 import android.text.Editable;
 import android.text.InputFilter;
@@ -8,10 +10,14 @@ import android.view.View;
 import android.widget.EditText;
 import android.widget.ImageButton;
 import android.widget.Spinner;
+import android.widget.Toast;
 
 import androidx.fragment.app.Fragment;
 import com.example.petstoremobile.fragments.ListFragment;
 
+import java.util.Calendar;
+import java.util.Locale;
+
 /**
  * Utility class for shared UI component logic and formatting.
  */
@@ -25,24 +31,16 @@ public class UIUtils {
     }
 
     /**
-     * Sets up a toggle for a filter layout, including icon changes and field resets.
+     * Sets up a toggle for a filter layout, including icon changes.
      */
     public static void setupFilterToggle(ImageButton btnToggle, View layoutFilter, EditText etSearch, Spinner... spinners) {
         btnToggle.setOnClickListener(v -> {
             boolean isVisible = layoutFilter.getVisibility() == View.VISIBLE;
             layoutFilter.setVisibility(isVisible ? View.GONE : View.VISIBLE);
             
-            // Use Android default icons or app-specific ones if available
             btnToggle.setImageResource(isVisible ? 
                     android.R.drawable.ic_menu_search : 
                     android.R.drawable.ic_menu_close_clear_cancel);
-
-            if (isVisible) {
-                if (etSearch != null) etSearch.setText("");
-                for (Spinner spinner : spinners) {
-                    if (spinner != null) spinner.setSelection(0);
-                }
-            }
         });
     }
 
@@ -73,4 +71,80 @@ public class UIUtils {
             @Override public void afterTextChanged(Editable s) {}
         });
     }
+
+    /**
+     * Sets the enabled state and alpha for multiple views, only if changed.
+     */
+    public static void setViewsEnabled(boolean enabled, View... views) {
+        for (View v : views) {
+            if (v != null) {
+                if (v.isEnabled() != enabled) {
+                    v.setEnabled(enabled);
+                }
+                float targetAlpha = enabled ? 1.0f : 0.5f;
+                if (Math.abs(v.getAlpha() - targetAlpha) > 0.01f) {
+                    v.setAlpha(targetAlpha);
+                }
+            }
+        }
+    }
+
+    /**
+     * Sets enabled state for a field and updates alpha for both the field and its label, only if changed.
+     */
+    public static void setFieldEnabled(boolean enabled, View field, View label) {
+        if (field != null) {
+            if (field.isEnabled() != enabled) {
+                field.setEnabled(enabled);
+            }
+            float targetAlpha = enabled ? 1.0f : 0.5f;
+            if (Math.abs(field.getAlpha() - targetAlpha) > 0.01f) {
+                field.setAlpha(targetAlpha);
+            }
+        }
+        if (label != null) {
+            float targetAlpha = enabled ? 1.0f : 0.5f;
+            if (Math.abs(label.getAlpha() - targetAlpha) > 0.01f) {
+                label.setAlpha(targetAlpha);
+            }
+        }
+    }
+
+    /**
+     * Sets the alpha for multiple views, only if changed.
+     */
+    public static void setViewsAlpha(float alpha, View... views) {
+        for (View v : views) {
+            if (v != null && Math.abs(v.getAlpha() - alpha) > 0.01f) {
+                v.setAlpha(alpha);
+            }
+        }
+    }
+
+    /**
+     * Displays a DatePickerDialog and sets the result to an EditText.
+     */
+    public static void showDatePicker(Context context, EditText editText, Runnable onDateSet) {
+        Calendar c = Calendar.getInstance();
+        DatePickerDialog d = new DatePickerDialog(context,
+                (dp, y, m, d1) -> {
+                    String selectedDate = String.format(Locale.getDefault(), "%04d-%02d-%02d", y, m + 1, d1);
+                    editText.setText(selectedDate);
+                    if (onDateSet != null) onDateSet.run();
+                },
+                c.get(Calendar.YEAR), c.get(Calendar.MONTH),
+                c.get(Calendar.DAY_OF_MONTH));
+        d.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
+        d.show();
+    }
+
+    /**
+     * Displays a toast and returns false. Useful for validation chains.
+     */
+    public static boolean showToast(Context context, String msg) {
+        if (context != null) {
+            Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
+        }
+        return false;
+    }
 }

android/app/src/main/java/com/example/petstoremobile/viewmodels/AdoptionDetailViewModel.java

@@ -0,0 +1,102 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.AdoptionDTO;
+import com.example.petstoremobile.dtos.DropdownDTO;
+import com.example.petstoremobile.repositories.AdoptionRepository;
+import com.example.petstoremobile.repositories.CustomerRepository;
+import com.example.petstoremobile.repositories.PetRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class AdoptionDetailViewModel extends ViewModel {
+    private final AdoptionRepository adoptionRepository;
+    private final PetRepository petRepository;
+    private final CustomerRepository customerRepository;
+    private final StoreRepository storeRepository;
+
+    private long adoptionId = -1;
+    private boolean isEditing = false;
+
+    private final MutableLiveData<List<DropdownDTO>> petList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<DropdownDTO>> customerList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<DropdownDTO>> storeList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<DropdownDTO>> employeeList = new MutableLiveData<>(new ArrayList<>());
+
+    @Inject
+    public AdoptionDetailViewModel(AdoptionRepository adoptionRepository, PetRepository petRepository,
+                                   CustomerRepository customerRepository, StoreRepository storeRepository) {
+        this.adoptionRepository = adoptionRepository;
+        this.petRepository = petRepository;
+        this.customerRepository = customerRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public void setAdoptionId(long id) {
+        this.adoptionId = id;
+        this.isEditing = id != -1;
+    }
+
+    public long getAdoptionId() {
+        return adoptionId;
+    }
+
+    public boolean isEditing() {
+        return isEditing;
+    }
+
+    public LiveData<Resource<AdoptionDTO>> loadAdoption() {
+        return adoptionRepository.getAdoptionById(adoptionId);
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadPets() {
+        return petRepository.getAdoptionPets();
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadCustomers() {
+        return customerRepository.getCustomerDropdowns();
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadStores() {
+        return storeRepository.getStoreDropdowns();
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadEmployees(Long storeId) {
+        return storeRepository.getStoreEmployees(storeId);
+    }
+
+    public LiveData<Resource<AdoptionDTO>> saveAdoption(AdoptionDTO dto) {
+        if (isEditing) {
+            return adoptionRepository.updateAdoption(adoptionId, dto);
+        } else {
+            return adoptionRepository.createAdoption(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteAdoption() {
+        return adoptionRepository.deleteAdoption(adoptionId);
+    }
+
+    public void setPetList(List<DropdownDTO> list) { petList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getPetList() { return petList; }
+
+    public void setCustomerList(List<DropdownDTO> list) { customerList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getCustomerList() { return customerList; }
+
+    public void setStoreList(List<DropdownDTO> list) { storeList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getStoreList() { return storeList; }
+
+    public void setEmployeeList(List<DropdownDTO> list) { employeeList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getEmployeeList() { return employeeList; }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/AdoptionListViewModel.java

@@ -0,0 +1,83 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.AdoptionDTO;
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.repositories.AdoptionRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class AdoptionListViewModel extends ViewModel {
+    private final AdoptionRepository adoptionRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<List<AdoptionDTO>> adoptions = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<StoreDTO>> stores = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    
+    private int currentPage = 0;
+    private boolean isLastPage = false;
+    private static final int PAGE_SIZE = 20;
+
+    @Inject
+    public AdoptionListViewModel(AdoptionRepository adoptionRepository, StoreRepository storeRepository) {
+        this.adoptionRepository = adoptionRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public LiveData<List<AdoptionDTO>> getAdoptions() { return adoptions; }
+    public LiveData<List<StoreDTO>> getStores() { return stores; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+    public boolean isLastPage() { return isLastPage; }
+
+    public void loadAdoptions(boolean reset, String query, String status, Long storeId, String date, Long employeeId) {
+        if (isLoading.getValue() != null && isLoading.getValue() && !reset) return;
+
+        if (reset) {
+            currentPage = 0;
+            isLastPage = false;
+        }
+
+        if ("All Statuses".equals(status)) status = null;
+
+        isLoading.setValue(true);
+        adoptionRepository.getAllAdoptions(currentPage, PAGE_SIZE, query, status, storeId, date, employeeId).observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    List<AdoptionDTO> currentList = reset ? new ArrayList<>() : new ArrayList<>(adoptions.getValue());
+                    currentList.addAll(resource.data.getContent());
+                    adoptions.setValue(currentList);
+                    isLastPage = resource.data.isLast();
+                    if (!isLastPage) currentPage++;
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadStores() {
+        storeRepository.getAllStores(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                stores.setValue(resource.data.getContent());
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeleteAdoptions(List<String> ids) {
+        return adoptionRepository.bulkDeleteAdoptions(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/AdoptionViewModel.java

@@ -1,68 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.AdoptionDTO;
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.repositories.AdoptionRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class AdoptionViewModel extends ViewModel {
-    private final AdoptionRepository repository;
-
-    @Inject
-    public AdoptionViewModel(AdoptionRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all adoptions with filters.
-     */
-    public LiveData<Resource<PageResponse<AdoptionDTO>>> getAllAdoptions(int page, int size, String query, String status, Long storeId, String date, Long employeeId) {
-        return repository.getAllAdoptions(page, size, query, status, storeId, date, employeeId);
-    }
-
-    /**
-     * Retrieves a single adoption by its ID.
-     */
-    public LiveData<Resource<AdoptionDTO>> getAdoptionById(Long id) {
-        return repository.getAdoptionById(id);
-    }
-
-    /**
-     * Creates a new adoption record.
-     */
-    public LiveData<Resource<AdoptionDTO>> createAdoption(AdoptionDTO adoption) {
-        return repository.createAdoption(adoption);
-    }
-
-    /**
-     * Updates an existing adoption record by ID.
-     */
-    public LiveData<Resource<AdoptionDTO>> updateAdoption(Long id, AdoptionDTO adoption) {
-        return repository.updateAdoption(id, adoption);
-    }
-
-    /**
-     * Deletes an adoption record by ID.
-     */
-    public LiveData<Resource<Void>> deleteAdoption(Long id) {
-        return repository.deleteAdoption(id);
-    }
-
-    /**
-     * Deletes multiple adoption records.
-     */
-    public LiveData<Resource<Void>> bulkDeleteAdoptions(List<String> ids) {
-        return repository.bulkDeleteAdoptions(new BulkDeleteRequest(ids));
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/AnalyticsViewModel.java

@@ -0,0 +1,163 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.SaleDTO;
+import com.example.petstoremobile.repositories.SaleRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class AnalyticsViewModel extends ViewModel {
+    private final SaleRepository saleRepository;
+
+    private final MutableLiveData<AnalyticsData> analyticsData = new MutableLiveData<>();
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    private final MutableLiveData<String> errorMessage = new MutableLiveData<>();
+
+    @Inject
+    public AnalyticsViewModel(SaleRepository saleRepository) {
+        this.saleRepository = saleRepository;
+    }
+
+    public LiveData<AnalyticsData> getAnalyticsData() { return analyticsData; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+    public LiveData<String> getErrorMessage() { return errorMessage; }
+
+    public void loadAnalytics() {
+        isLoading.setValue(true);
+        errorMessage.setValue(null);
+        saleRepository.getAllSales(0, 1000, null, null, null, "saleDate,desc").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    computeAnalytics(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    errorMessage.setValue(resource.message);
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    private void computeAnalytics(List<SaleDTO> sales) {
+        List<SaleDTO> regularSales = new ArrayList<>();
+        for (SaleDTO s : sales) {
+            if (!Boolean.TRUE.equals(s.getIsRefund()))
+                regularSales.add(s);
+        }
+
+        AnalyticsData data = new AnalyticsData();
+
+        // Summary
+        BigDecimal totalRevenue = BigDecimal.ZERO;
+        int totalItems = 0;
+        for (SaleDTO s : regularSales) {
+            if (s.getTotalAmount() != null) totalRevenue = totalRevenue.add(s.getTotalAmount());
+            if (s.getItems() != null) {
+                for (SaleDTO.SaleItemDTO item : s.getItems()) {
+                    if (item.getQuantity() != null) totalItems += Math.abs(item.getQuantity());
+                }
+            }
+        }
+        data.totalRevenue = totalRevenue;
+        data.totalTransactions = regularSales.size();
+        data.avgTransaction = data.totalTransactions > 0
+                ? totalRevenue.divide(BigDecimal.valueOf(data.totalTransactions), 2, RoundingMode.HALF_UP)
+                : BigDecimal.ZERO;
+        data.totalItems = totalItems;
+
+        // Product Maps
+        Map<String, BigDecimal> revenueByProduct = new LinkedHashMap<>();
+        Map<String, Integer> quantityByProduct = new LinkedHashMap<>();
+        Map<String, Integer> paymentCount = new LinkedHashMap<>();
+        Map<String, BigDecimal> employeeRevenue = new LinkedHashMap<>();
+
+        for (SaleDTO s : regularSales) {
+            // Payments
+            String method = s.getPaymentMethod() != null ? s.getPaymentMethod() : "Unknown";
+            paymentCount.merge(method, 1, Integer::sum);
+
+            // Employee
+            String emp = s.getEmployeeName() != null ? s.getEmployeeName() : "Unknown";
+            if (s.getTotalAmount() != null) employeeRevenue.merge(emp, s.getTotalAmount(), BigDecimal::add);
+
+            // Items
+            if (s.getItems() != null) {
+                for (SaleDTO.SaleItemDTO item : s.getItems()) {
+                    String name = item.getProductName() != null ? item.getProductName() : "Unknown";
+                    int qty = item.getQuantity() != null ? Math.abs(item.getQuantity()) : 0;
+                    BigDecimal lineTotal = item.getUnitPrice() != null
+                            ? item.getUnitPrice().multiply(BigDecimal.valueOf(qty))
+                            : BigDecimal.ZERO;
+                    revenueByProduct.merge(name, lineTotal, BigDecimal::add);
+                    quantityByProduct.merge(name, qty, Integer::sum);
+                }
+            }
+        }
+
+        // Sort Top Revenue
+        data.topRevenueProducts = new ArrayList<>(revenueByProduct.entrySet());
+        data.topRevenueProducts.sort((a, b) -> b.getValue().compareTo(a.getValue()));
+        if (data.topRevenueProducts.size() > 5) data.topRevenueProducts = data.topRevenueProducts.subList(0, 5);
+
+        // Sort Top Quantity
+        data.topQuantityProducts = new ArrayList<>(quantityByProduct.entrySet());
+        data.topQuantityProducts.sort((a, b) -> b.getValue() - a.getValue());
+        if (data.topQuantityProducts.size() > 5) data.topQuantityProducts = data.topQuantityProducts.subList(0, 5);
+
+        // Payment Stats
+        data.paymentMethodStats = new ArrayList<>(paymentCount.entrySet());
+
+        // Employee Performance
+        data.employeePerformance = new ArrayList<>(employeeRevenue.entrySet());
+        data.employeePerformance.sort((a, b) -> b.getValue().compareTo(a.getValue()));
+
+        // Daily Revenue (last 7 days)
+        Map<String, BigDecimal> dailyMap = new TreeMap<>();
+        for (int i = 6; i >= 0; i--) {
+            Calendar day = Calendar.getInstance();
+            day.add(Calendar.DAY_OF_YEAR, -i);
+            String key = String.format("%04d-%02d-%02d",
+                    day.get(Calendar.YEAR), day.get(Calendar.MONTH) + 1, day.get(Calendar.DAY_OF_MONTH));
+            dailyMap.put(key, BigDecimal.ZERO);
+        }
+        for (SaleDTO s : regularSales) {
+            if (s.getSaleDate() != null && s.getTotalAmount() != null) {
+                String date = s.getSaleDate().length() >= 10 ? s.getSaleDate().substring(0, 10) : s.getSaleDate();
+                if (dailyMap.containsKey(date)) dailyMap.merge(date, s.getTotalAmount(), BigDecimal::add);
+            }
+        }
+        data.dailyRevenue = new ArrayList<>(dailyMap.entrySet());
+
+        analyticsData.setValue(data);
+    }
+
+    public static class AnalyticsData {
+        public BigDecimal totalRevenue;
+        public int totalTransactions;
+        public BigDecimal avgTransaction;
+        public int totalItems;
+        public List<Map.Entry<String, BigDecimal>> topRevenueProducts;
+        public List<Map.Entry<String, Integer>> topQuantityProducts;
+        public List<Map.Entry<String, Integer>> paymentMethodStats;
+        public List<Map.Entry<String, BigDecimal>> employeePerformance;
+        public List<Map.Entry<String, BigDecimal>> dailyRevenue;
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/AppointmentDetailViewModel.java

@@ -0,0 +1,402 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.AppointmentDTO;
+import com.example.petstoremobile.dtos.DropdownDTO;
+import com.example.petstoremobile.dtos.ServiceDTO;
+import com.example.petstoremobile.repositories.AppointmentRepository;
+import com.example.petstoremobile.repositories.CustomerRepository;
+import com.example.petstoremobile.repositories.PetRepository;
+import com.example.petstoremobile.repositories.ServiceRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.DateTimeUtils;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+/**
+ * ViewModel for managing appointment details and form state.
+ */
+@HiltViewModel
+public class AppointmentDetailViewModel extends ViewModel {
+    private final AppointmentRepository repository;
+    private final CustomerRepository customerRepository;
+    private final StoreRepository storeRepository;
+    private final PetRepository petRepository;
+    private final ServiceRepository serviceRepository;
+
+    private final MutableLiveData<List<DropdownDTO>> customers = new MutableLiveData<>();
+    private final MutableLiveData<List<DropdownDTO>> stores = new MutableLiveData<>();
+    private final MutableLiveData<List<ServiceDTO>> services = new MutableLiveData<>();
+    private final MutableLiveData<List<DropdownDTO>> customerPets = new MutableLiveData<>();
+    private final MutableLiveData<List<DropdownDTO>> storeEmployees = new MutableLiveData<>();
+    private final MutableLiveData<ViewState> viewState = new MutableLiveData<>(new ViewState());
+
+    private long appointmentId = -1;
+    private Long currentCustomerId;
+    private Long currentStoreId;
+    private Long currentPetId;
+    private Long currentServiceId;
+    private Long currentStaffId;
+
+    /**
+     * Constructor for AppointmentDetailViewModel.
+     */
+    @Inject
+    public AppointmentDetailViewModel(
+            AppointmentRepository repository,
+            CustomerRepository customerRepository,
+            StoreRepository storeRepository,
+            PetRepository petRepository,
+            ServiceRepository serviceRepository) {
+        this.repository = repository;
+        this.customerRepository = customerRepository;
+        this.storeRepository = storeRepository;
+        this.petRepository = petRepository;
+        this.serviceRepository = serviceRepository;
+    }
+
+    // Initial Data Loading
+
+    /**
+     * Loads initial dropdown data for customers, stores, and services.
+     */
+    public void loadInitialFormData() {
+        customerRepository.getCustomerDropdowns().observeForever(r -> {
+            if (r.status == Resource.Status.SUCCESS) customers.setValue(r.data);
+        });
+        storeRepository.getStoreDropdowns().observeForever(r -> {
+            if (r.status == Resource.Status.SUCCESS) stores.setValue(r.data);
+        });
+        serviceRepository.getAllServices(0, 200, null, "serviceName").observeForever(r -> {
+            if (r.status == Resource.Status.SUCCESS && r.data != null) services.setValue(r.data.getContent());
+        });
+    }
+
+    // LiveData Getters
+
+    /**
+     * Returns the LiveData for the list of customers.
+     */
+    public LiveData<List<DropdownDTO>> getCustomers() { return customers; }
+
+    /**
+     * Returns the LiveData for the list of stores.
+     */
+    public LiveData<List<DropdownDTO>> getStores() { return stores; }
+
+    /**
+     * Returns the LiveData for the list of services.
+     */
+    public LiveData<List<ServiceDTO>> getServices() { return services; }
+
+    /**
+     * Returns the LiveData for the list of pets for the current customer.
+     */
+    public LiveData<List<DropdownDTO>> getCustomerPets() { return customerPets; }
+
+    /**
+     * Returns the LiveData for the list of employees for the current store.
+     */
+    public LiveData<List<DropdownDTO>> getStoreEmployees() { return storeEmployees; }
+
+    /**
+     * Returns the LiveData for the view state.
+     */
+    public LiveData<ViewState> getViewState() { return viewState; }
+
+    //State Getters
+
+    /**
+     * Returns the current appointment ID.
+     */
+    public long getAppointmentId() { return appointmentId; }
+
+    /**
+     * Sets the current appointment ID and updates the mode.
+     */
+    public void setAppointmentId(long id) {
+        this.appointmentId = id;
+        initMode(id != -1);
+    }
+
+    // Selection Handlers for spinners
+
+    /**
+     * Handles customer selection and loads their pets.
+     */
+    public void onCustomerSelected(int position) {
+        List<DropdownDTO> list = customers.getValue();
+        if (position > 0 && list != null && position <= list.size()) {
+            currentCustomerId = list.get(position - 1).getId();
+            loadPetsForCustomer(currentCustomerId);
+            updateViewState(s -> {
+                s.selectedCustomerId = currentCustomerId;
+                s.isPetEnabled = !s.isEditing;
+            });
+        } else {
+            currentCustomerId = null;
+            customerPets.setValue(new ArrayList<>());
+            updateViewState(s -> {
+                s.selectedCustomerId = null;
+                s.isPetEnabled = false;
+            });
+        }
+    }
+
+    /**
+     * Handles store selection and loads its employees.
+     */
+    public void onStoreSelected(int position) {
+        List<DropdownDTO> list = stores.getValue();
+        if (position > 0 && list != null && position <= list.size()) {
+            currentStoreId = list.get(position - 1).getId();
+            loadEmployeesForStore(currentStoreId);
+            updateViewState(s -> {
+                s.selectedStoreId = currentStoreId;
+                s.isStaffEnabled = !s.isPast;
+            });
+        } else {
+            currentStoreId = null;
+            storeEmployees.setValue(new ArrayList<>());
+            updateViewState(s -> {
+                s.selectedStoreId = null;
+                s.isStaffEnabled = false;
+            });
+        }
+    }
+
+    /**
+     * Handles service selection.
+     */
+    public void onServiceSelected(int position) {
+        List<ServiceDTO> list = services.getValue();
+        currentServiceId = (position > 0 && list != null && position <= list.size()) ? list.get(position - 1).getServiceId() : null;
+        updateViewState(s -> s.selectedServiceId = currentServiceId);
+    }
+
+    /**
+     * Handles pet selection.
+     */
+    public void onPetSelected(int position) {
+        List<DropdownDTO> list = customerPets.getValue();
+        currentPetId = (position > 0 && list != null && position <= list.size()) ? list.get(position - 1).getId() : null;
+        updateViewState(s -> s.selectedPetId = currentPetId);
+    }
+
+    /**
+     * Handles staff selection.
+     */
+    public void onStaffSelected(int position) {
+        List<DropdownDTO> list = storeEmployees.getValue();
+        currentStaffId = (position > 0 && list != null && position <= list.size()) ? list.get(position - 1).getId() : null;
+        updateViewState(s -> s.selectedStaffId = currentStaffId);
+    }
+
+    /**
+     * Loads the list of pets for a specific customer.
+     */
+    private void loadPetsForCustomer(Long customerId) {
+        petRepository.getCustomerPets(customerId).observeForever(r -> {
+            if (r.status == Resource.Status.SUCCESS) customerPets.setValue(r.data);
+        });
+    }
+
+    /**
+     * Loads the list of employees for a specific store.
+     */
+    private void loadEmployeesForStore(Long storeId) {
+        storeRepository.getStoreEmployees(storeId).observeForever(r -> {
+            if (r.status == Resource.Status.SUCCESS) storeEmployees.setValue(r.data);
+        });
+    }
+
+    // Appointment Detail CRUD
+
+    /**
+     * Fetches appointment details and populates internal state.
+     */
+    public LiveData<Resource<AppointmentDTO>> loadAppointment() {
+        MutableLiveData<Resource<AppointmentDTO>> result = new MutableLiveData<>();
+        repository.getAppointmentById(appointmentId).observeForever(resource -> {
+            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                AppointmentDTO a = resource.data;
+                currentCustomerId = a.getCustomerId();
+                currentStoreId = a.getStoreId();
+                currentPetId = a.getPetId();
+                currentServiceId = a.getServiceId();
+                currentStaffId = a.getEmployeeId();
+
+                updateViewState(s -> {
+                    s.selectedCustomerId = currentCustomerId;
+                    s.selectedStoreId = currentStoreId;
+                    s.selectedPetId = currentPetId;
+                    s.selectedServiceId = currentServiceId;
+                    s.selectedStaffId = currentStaffId;
+                });
+
+                if (currentCustomerId != null) loadPetsForCustomer(currentCustomerId);
+                if (currentStoreId != null) loadEmployeesForStore(currentStoreId);
+            }
+            result.setValue(resource);
+        });
+        return result;
+    }
+
+    /**
+     * Saves the appointment by building the DTO from tracked state.
+     */
+    public LiveData<Resource<AppointmentDTO>> saveAppointment(String date, String time, String status) {
+        AppointmentDTO dto = new AppointmentDTO(currentCustomerId, currentStoreId, currentServiceId, currentStaffId, date, time, status, currentPetId);
+        if (appointmentId != -1) {
+            return repository.updateAppointment(appointmentId, dto);
+        } else {
+            return repository.createAppointment(dto);
+        }
+    }
+
+    /**
+     * Deletes the current appointment.
+     */
+    public LiveData<Resource<Void>> deleteAppointment() {
+        return repository.deleteAppointment(appointmentId);
+    }
+
+    // UI Logic
+
+    /**
+     * Updates the UI state when date, time, or status changes.
+     */
+    public void onDateOrTimeChanged(String date, String time, String currentStatus) {
+        updateViewState(s -> {
+            s.availableStatuses = calculateAvailableStatuses(s.isEditing, date, time, currentStatus);
+            boolean isPast = DateTimeUtils.isDateTimeInPast(date, time);
+            boolean isCancelled = "Cancelled".equalsIgnoreCase(currentStatus);
+
+            if (isCancelled) {
+                s.isPast = true;
+                setAllFieldsEnabled(s, false);
+                s.isStatusEnabled = false;
+                s.isSaveVisible = false;
+            } else if (isPast) {
+                s.isPast = true;
+                setAllFieldsEnabled(s, false);
+                s.isStatusEnabled = true;
+            } else {
+                s.isPast = false;
+                if (!s.isEditing) {
+                    s.isCustomerEnabled = true;
+                    s.isStoreEnabled = true;
+                    s.isServiceEnabled = true;
+                    s.isPetEnabled = currentCustomerId != null;
+                }
+                s.isDateEnabled = true;
+                s.isTimeEnabled = true;
+                s.isStatusEnabled = true;
+            }
+        });
+    }
+
+    /**
+     * Calculates available appointment statuses based on the current context.
+     */
+    private String[] calculateAvailableStatuses(boolean isEditing, String date, String currentTime, String currentStatus) {
+        if (!isEditing) return new String[]{"Booked"};
+        if (date == null || date.isEmpty()) return new String[]{};
+        if ("Cancelled".equalsIgnoreCase(currentStatus)) return new String[]{"Cancelled"};
+        if (DateTimeUtils.isDateTimeInPast(date, currentTime)) return new String[]{"Completed", "Missed"};
+        return new String[]{"Booked", "Cancelled"};
+    }
+
+    /**
+     * Helper method to enable or disable all fields.
+     */
+    private void setAllFieldsEnabled(ViewState s, boolean enabled) {
+        s.isCustomerEnabled = enabled;
+        s.isStoreEnabled = enabled;
+        s.isPetEnabled = enabled;
+        s.isServiceEnabled = enabled;
+        s.isStaffEnabled = enabled;
+        s.isDateEnabled = enabled;
+        s.isTimeEnabled = enabled;
+    }
+
+    /**
+     * Initializes the UI mode (Create vs Edit).
+     */
+    public void initMode(boolean isEditing) {
+        updateViewState(s -> {
+            s.isEditing = isEditing;
+            s.isDeleteVisible = isEditing;
+            if (isEditing) {
+                s.isCustomerEnabled = false;
+                s.isStoreEnabled = false;
+                s.isPetEnabled = false;
+                s.isServiceEnabled = false;
+            } else {
+                s.isCustomerEnabled = true;
+                s.isStoreEnabled = true;
+                s.isServiceEnabled = true;
+                s.isPetEnabled = false; // until customer selected
+                s.isStaffEnabled = false; // until store selected
+                s.availableStatuses = new String[]{"Booked"};
+            }
+        });
+    }
+
+    /**
+     * Validates if a booking is in the future.
+     */
+    public boolean isValidFutureBooking(String status, String date, String time) {
+        return !"BOOKED".equalsIgnoreCase(status) || !DateTimeUtils.isDateTimeInPast(date, time);
+    }
+
+    /**
+     * Helper to update the view state and notify observers.
+     */
+    private void updateViewState(Action<ViewState> action) {
+        ViewState current = viewState.getValue();
+        if (current != null) {
+            action.run(current);
+            viewState.setValue(current);
+        }
+    }
+
+    private interface Action<T> {
+        void run(T t);
+    }
+
+    /**
+     * A Class to show the states of Appointment Detail Fragment.
+     */
+    public static class ViewState {
+        public boolean isPast = false;
+        public boolean isEditing = false;
+        public boolean isSaveVisible = true;
+        public boolean isDeleteVisible = false;
+        public boolean isCustomerEnabled = true;
+        public boolean isStoreEnabled = true;
+        public boolean isPetEnabled = false;
+        public boolean isServiceEnabled = true;
+        public boolean isStaffEnabled = false;
+        public boolean isDateEnabled = true;
+        public boolean isTimeEnabled = true;
+        public boolean isStatusEnabled = true;
+        public String[] availableStatuses = new String[]{};
+
+        // Selected IDs
+        public Long selectedCustomerId = null;
+        public Long selectedStoreId = null;
+        public Long selectedPetId = null;
+        public Long selectedServiceId = null;
+        public Long selectedStaffId = null;
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/AppointmentListViewModel.java

@@ -0,0 +1,65 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.AppointmentDTO;
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.repositories.AppointmentRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class AppointmentListViewModel extends ViewModel {
+    private final AppointmentRepository appointmentRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<List<AppointmentDTO>> appointments = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<StoreDTO>> stores = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public AppointmentListViewModel(AppointmentRepository appointmentRepository, StoreRepository storeRepository) {
+        this.appointmentRepository = appointmentRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public LiveData<List<AppointmentDTO>> getAppointments() { return appointments; }
+    public LiveData<List<StoreDTO>> getStores() { return stores; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadAppointments(String query, String status, Long storeId, String date, Long employeeId) {
+        isLoading.setValue(true);
+        appointmentRepository.getAllAppointments(0, 500, query, status, storeId, date, employeeId).observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    appointments.setValue(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadStores() {
+        storeRepository.getAllStores(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                stores.setValue(resource.data.getContent());
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeleteAppointments(List<String> ids) {
+        return appointmentRepository.bulkDeleteAppointments(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/AppointmentViewModel.java

@@ -1,68 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.AppointmentDTO;
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.repositories.AppointmentRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class AppointmentViewModel extends ViewModel {
-    private final AppointmentRepository repository;
-
-    @Inject
-    public AppointmentViewModel(AppointmentRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all appointments with optional filters.
-     */
-    public LiveData<Resource<PageResponse<AppointmentDTO>>> getAllAppointments(int page, int size, String query, String status, Long storeId, String date, Long employeeId) {
-        return repository.getAllAppointments(page, size, query, status, storeId, date, employeeId);
-    }
-
-    /**
-     * Retrieves a single appointment by its ID.
-     */
-    public LiveData<Resource<AppointmentDTO>> getAppointmentById(Long id) {
-        return repository.getAppointmentById(id);
-    }
-
-    /**
-     * Creates a new appointment.
-     */
-    public LiveData<Resource<AppointmentDTO>> createAppointment(AppointmentDTO appointment) {
-        return repository.createAppointment(appointment);
-    }
-
-    /**
-     * Updates an existing appointment record by ID.
-     */
-    public LiveData<Resource<AppointmentDTO>> updateAppointment(Long id, AppointmentDTO appointment) {
-        return repository.updateAppointment(id, appointment);
-    }
-
-    /**
-     * Deletes an appointment record by ID.
-     */
-    public LiveData<Resource<Void>> deleteAppointment(Long id) {
-        return repository.deleteAppointment(id);
-    }
-
-    /**
-     * Deletes multiple appointment records.
-     */
-    public LiveData<Resource<Void>> bulkDeleteAppointments(List<String> ids) {
-        return repository.bulkDeleteAppointments(new BulkDeleteRequest(ids));
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ChatListViewModel.java

@@ -0,0 +1,174 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.ConversationDTO;
+import com.example.petstoremobile.dtos.CustomerDTO;
+import com.example.petstoremobile.dtos.MessageDTO;
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.SendMessageRequest;
+import com.example.petstoremobile.models.Chat;
+import com.example.petstoremobile.models.Message;
+import com.example.petstoremobile.repositories.ChatRepository;
+import com.example.petstoremobile.repositories.CustomerRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+import okhttp3.MultipartBody;
+import okhttp3.RequestBody;
+import okhttp3.ResponseBody;
+
+@HiltViewModel
+public class ChatListViewModel extends ViewModel {
+    private final ChatRepository chatRepository;
+    private final CustomerRepository customerRepository;
+
+    private final MutableLiveData<List<Chat>> activeChats = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<Chat>> closedChats = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<Message>> messageList = new MutableLiveData<>(new ArrayList<>());
+    private final Map<Long, String> customerNames = new HashMap<>();
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    
+    private Long lastActiveConversationId = null;
+
+    @Inject
+    public ChatListViewModel(ChatRepository chatRepository, CustomerRepository customerRepository) {
+        this.chatRepository = chatRepository;
+        this.customerRepository = customerRepository;
+    }
+
+    public LiveData<List<Chat>> getActiveChats() { return activeChats; }
+    public LiveData<List<Chat>> getClosedChats() { return closedChats; }
+    public LiveData<List<Message>> getMessageList() { return messageList; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public Long getLastActiveConversationId() {
+        return lastActiveConversationId;
+    }
+
+    public void setLastActiveConversationId(Long conversationId) {
+        this.lastActiveConversationId = conversationId;
+    }
+
+    public void loadCustomers() {
+        isLoading.setValue(true);
+        customerRepository.getAllCustomers(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                for (CustomerDTO c : resource.data.getContent()) {
+                    customerNames.put(c.getCustomerId(), c.getFullName());
+                }
+                loadConversations();
+            } else if (resource != null && resource.status == Resource.Status.ERROR) {
+                isLoading.setValue(false);
+            }
+        });
+    }
+
+    public void loadConversations() {
+        isLoading.setValue(true);
+        chatRepository.getAllConversations().observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                List<Chat> active = new ArrayList<>();
+                List<Chat> closed = new ArrayList<>();
+                for (ConversationDTO dto : resource.data) {
+                    String name = customerNames.getOrDefault(dto.getCustomerId(), "Customer #" + dto.getCustomerId());
+                    Chat chat = new Chat(String.valueOf(dto.getId()), name, dto.getLastMessage(), dto.getCustomerId(), dto.getStaffId(), dto.getStatus());
+                    if ("CLOSED".equalsIgnoreCase(dto.getStatus())) {
+                        closed.add(chat);
+                    } else {
+                        active.add(chat);
+                    }
+                }
+                activeChats.setValue(active);
+                closedChats.setValue(closed);
+                isLoading.setValue(false);
+            } else if (resource != null && resource.status == Resource.Status.ERROR) {
+                isLoading.setValue(false);
+            }
+        });
+    }
+
+    public void loadMessageHistory(Long conversationId) {
+        isLoading.setValue(true);
+        chatRepository.getMessages(conversationId).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                List<Message> messages = new ArrayList<>();
+                for (MessageDTO dto : resource.data) {
+                    messages.add(dtoToModel(dto));
+                }
+                messageList.setValue(messages);
+                isLoading.setValue(false);
+            } else if (resource != null && resource.status == Resource.Status.ERROR) {
+                isLoading.setValue(false);
+            }
+        });
+    }
+
+    public LiveData<Resource<MessageDTO>> sendMessage(Long conversationId, String text) {
+        return chatRepository.sendMessage(conversationId, new SendMessageRequest(text));
+    }
+
+    public LiveData<Resource<MessageDTO>> sendMessageWithAttachment(Long conversationId, MultipartBody.Part content, MultipartBody.Part attachment) {
+        return chatRepository.sendMessageWithAttachment(conversationId, content, attachment);
+    }
+
+    public LiveData<Resource<ResponseBody>> downloadAttachment(Long messageId) {
+        return chatRepository.downloadAttachment(messageId);
+    }
+
+    public void addMessageLocally(MessageDTO dto) {
+        List<Message> current = new ArrayList<>(messageList.getValue());
+        current.add(dtoToModel(dto));
+        messageList.setValue(current);
+    }
+
+    public void updateConversationLocally(ConversationDTO dto) {
+        updateList(activeChats, dto);
+        updateList(closedChats, dto);
+
+        loadConversations();
+    }
+
+    private void updateList(MutableLiveData<List<Chat>> liveData, ConversationDTO dto) {
+        List<Chat> current = new ArrayList<>(liveData.getValue());
+        String name = customerNames.getOrDefault(dto.getCustomerId(), "Customer #" + dto.getCustomerId());
+        boolean updated = false;
+        for (int i = 0; i < current.size(); i++) {
+            if (current.get(i).getChatId().equals(String.valueOf(dto.getId()))) {
+                current.set(i, new Chat(String.valueOf(dto.getId()), name, dto.getLastMessage(), dto.getCustomerId(), dto.getStaffId(), dto.getStatus()));
+                updated = true;
+                break;
+            }
+        }
+        if (updated) liveData.setValue(current);
+    }
+
+    private Message dtoToModel(MessageDTO dto) {
+        Message m = new Message();
+        m.setId(dto.getId());
+        m.setConversationId(dto.getConversationId());
+        m.setSenderId(dto.getSenderId());
+        m.setContent(dto.getContent());
+        m.setTimestamp(dto.getTimestamp());
+        m.setIsRead(dto.getIsRead());
+        m.setAttachmentUrl(dto.getAttachmentUrl());
+        m.setAttachmentName(dto.getAttachmentName());
+        m.setAttachmentMimeType(dto.getAttachmentMimeType());
+        m.setAttachmentSizeBytes(dto.getAttachmentSizeBytes());
+        return m;
+    }
+
+    public String getCustomerName(Long customerId) {
+        return customerNames.getOrDefault(customerId, "Customer #" + customerId);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ChatViewModel.java

@@ -1,58 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.ConversationDTO;
-import com.example.petstoremobile.dtos.CustomerDTO;
-import com.example.petstoremobile.dtos.MessageDTO;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.SendMessageRequest;
-import com.example.petstoremobile.repositories.ChatRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-/**
- * ViewModel for managing chat-related UI state and data operations.
- */
-@HiltViewModel
-public class ChatViewModel extends ViewModel {
-    private final ChatRepository repository;
-
-    @Inject
-    public ChatViewModel(ChatRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Retrieves all chat conversations for the current user.
-     */
-    public LiveData<Resource<List<ConversationDTO>>> getAllConversations() {
-        return repository.getAllConversations();
-    }
-
-    /**
-     * Retrieves the message history for a specific conversation.
-     */
-    public LiveData<Resource<List<MessageDTO>>> getMessages(Long conversationId) {
-        return repository.getMessages(conversationId);
-    }
-
-    /**
-     * Sends a plain text message to a conversation.
-     */
-    public LiveData<Resource<MessageDTO>> sendMessage(Long conversationId, SendMessageRequest request) {
-        return repository.sendMessage(conversationId, request);
-    }
-
-    /**
-     * Fetches a paginated list of customers.
-     */
-    public LiveData<Resource<PageResponse<CustomerDTO>>> getAllCustomers(int page, int size) {
-        return repository.getAllCustomers(page, size);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/CustomerViewModel.java

@@ -1,37 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.CustomerDTO;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.repositories.CustomerRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class CustomerViewModel extends ViewModel {
-    private final CustomerRepository repository;
-
-    @Inject
-    public CustomerViewModel(CustomerRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all customers.
-     */
-    public LiveData<Resource<PageResponse<CustomerDTO>>> getAllCustomers(int page, int size) {
-        return repository.getAllCustomers(page, size);
-    }
-
-    /**
-     * Retrieves a single customer by their ID.
-     */
-    public LiveData<Resource<CustomerDTO>> getCustomerById(Long id) {
-        return repository.getCustomerById(id);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/EmployeeViewModel.java

@@ -1,43 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.EmployeeDTO;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.repositories.EmployeeRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class EmployeeViewModel extends ViewModel {
-    private final EmployeeRepository employeeRepository;
-
-    @Inject
-    public EmployeeViewModel(EmployeeRepository employeeRepository) {
-        this.employeeRepository = employeeRepository;
-    }
-
-    public LiveData<Resource<PageResponse<EmployeeDTO>>> getAllEmployees(int page, int size) {
-        return employeeRepository.getAllEmployees(page, size);
-    }
-
-    public LiveData<Resource<EmployeeDTO>> getEmployeeById(Long id) {
-        return employeeRepository.getEmployeeById(id);
-    }
-
-    public LiveData<Resource<EmployeeDTO>> createEmployee(EmployeeDTO dto) {
-        return employeeRepository.createEmployee(dto);
-    }
-
-    public LiveData<Resource<EmployeeDTO>> updateEmployee(Long id, EmployeeDTO dto) {
-        return employeeRepository.updateEmployee(id, dto);
-    }
-
-    public LiveData<Resource<Void>> deleteEmployee(Long id) {
-        return employeeRepository.deleteEmployee(id);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/InventoryDetailViewModel.java

@@ -0,0 +1,79 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.DropdownDTO;
+import com.example.petstoremobile.dtos.InventoryDTO;
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.ProductDTO;
+import com.example.petstoremobile.repositories.InventoryRepository;
+import com.example.petstoremobile.repositories.ProductRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class InventoryDetailViewModel extends ViewModel {
+    private final InventoryRepository inventoryRepository;
+    private final StoreRepository storeRepository;
+    private final ProductRepository productRepository;
+
+    private long inventoryId = -1;
+    private boolean isEditing = false;
+
+    private final MutableLiveData<List<DropdownDTO>> storeList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<ProductDTO>> productList = new MutableLiveData<>(new ArrayList<>());
+
+    @Inject
+    public InventoryDetailViewModel(InventoryRepository inventoryRepository, StoreRepository storeRepository, ProductRepository productRepository) {
+        this.inventoryRepository = inventoryRepository;
+        this.storeRepository = storeRepository;
+        this.productRepository = productRepository;
+    }
+
+    public void setInventoryId(long id) {
+        this.inventoryId = id;
+        this.isEditing = id != -1;
+    }
+
+    public long getInventoryId() { return inventoryId; }
+    public boolean isEditing() { return isEditing; }
+
+    public LiveData<Resource<InventoryDTO>> loadInventory() {
+        return inventoryRepository.getInventoryById(inventoryId);
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadStores() {
+        return storeRepository.getStoreDropdowns();
+    }
+
+    public LiveData<Resource<PageResponse<ProductDTO>>> loadProducts() {
+        return productRepository.getAllProducts(null, null, 0, 500, "prodName");
+    }
+
+    public LiveData<Resource<InventoryDTO>> saveInventory(InventoryDTO dto) {
+        if (isEditing) {
+            return inventoryRepository.updateInventory(inventoryId, dto);
+        } else {
+            return inventoryRepository.createInventory(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteInventory() {
+        return inventoryRepository.deleteInventory(inventoryId);
+    }
+
+    public void setStoreList(List<DropdownDTO> list) { storeList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getStoreList() { return storeList; }
+
+    public void setProductList(List<ProductDTO> list) { productList.setValue(list); }
+    public LiveData<List<ProductDTO>> getProductList() { return productList; }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/InventoryListViewModel.java

@@ -0,0 +1,81 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.InventoryDTO;
+import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.repositories.InventoryRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class InventoryListViewModel extends ViewModel {
+    private final InventoryRepository inventoryRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<List<InventoryDTO>> inventory = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<StoreDTO>> stores = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    
+    private int currentPage = 0;
+    private boolean isLastPage = false;
+    private static final int PAGE_SIZE = 20;
+
+    @Inject
+    public InventoryListViewModel(InventoryRepository inventoryRepository, StoreRepository storeRepository) {
+        this.inventoryRepository = inventoryRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public LiveData<List<InventoryDTO>> getInventory() { return inventory; }
+    public LiveData<List<StoreDTO>> getStores() { return stores; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+    public boolean isLastPage() { return isLastPage; }
+
+    public void loadInventory(boolean reset, String query, Long storeId) {
+        if (isLoading.getValue() != null && isLoading.getValue() && !reset) return;
+
+        if (reset) {
+            currentPage = 0;
+            isLastPage = false;
+        }
+
+        isLoading.setValue(true);
+        inventoryRepository.getAllInventory(query, storeId, currentPage, PAGE_SIZE, "product.prodName").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    List<InventoryDTO> currentList = reset ? new ArrayList<>() : new ArrayList<>(inventory.getValue());
+                    currentList.addAll(resource.data.getContent());
+                    inventory.setValue(currentList);
+                    isLastPage = resource.data.isLast();
+                    if (!isLastPage) currentPage++;
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadStores() {
+        storeRepository.getAllStores(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                stores.setValue(resource.data.getContent());
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeleteInventory(List<String> ids) {
+        return inventoryRepository.bulkDeleteInventory(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/InventoryViewModel.java

@@ -1,90 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.CategoryDTO;
-import com.example.petstoremobile.dtos.InventoryDTO;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.StoreDTO;
-import com.example.petstoremobile.repositories.CategoryRepository;
-import com.example.petstoremobile.repositories.InventoryRepository;
-import com.example.petstoremobile.repositories.StoreRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class InventoryViewModel extends ViewModel {
-    private final InventoryRepository inventoryRepository;
-    private final CategoryRepository categoryRepository;
-    private final StoreRepository storeRepository;
-
-    @Inject
-    public InventoryViewModel(InventoryRepository inventoryRepository, CategoryRepository categoryRepository, StoreRepository storeRepository) {
-        this.inventoryRepository = inventoryRepository;
-        this.categoryRepository = categoryRepository;
-        this.storeRepository = storeRepository;
-    }
-
-    /**
-     * Retrieves a paginated list of inventory items, with optional filtering and sorting.
-     */
-    public LiveData<Resource<PageResponse<InventoryDTO>>> getAllInventory(String query, Long storeId, int page, int size, String sort) {
-        return inventoryRepository.getAllInventory(query, storeId, page, size, sort);
-    }
-
-    /**
-     * Retrieves a single inventory item by its ID.
-     */
-    public LiveData<Resource<InventoryDTO>> getInventoryById(Long id) {
-        return inventoryRepository.getInventoryById(id);
-    }
-
-    /**
-     * Creates a new inventory record.
-     */
-    public LiveData<Resource<InventoryDTO>> createInventory(InventoryDTO request) {
-        return inventoryRepository.createInventory(request);
-    }
-
-    /**
-     * Updates an existing inventory record by ID.
-     */
-    public LiveData<Resource<InventoryDTO>> updateInventory(Long id, InventoryDTO request) {
-        return inventoryRepository.updateInventory(id, request);
-    }
-
-    /**
-     * Deletes an inventory record by ID.
-     */
-    public LiveData<Resource<Void>> deleteInventory(Long id) {
-        return inventoryRepository.deleteInventory(id);
-    }
-
-    /**
-     * Deletes multiple inventory records in a single request.
-     */
-    public LiveData<Resource<Void>> bulkDeleteInventory(List<String> ids) {
-        return inventoryRepository.bulkDeleteInventory(new BulkDeleteRequest(ids));
-    }
-
-    /**
-     * Retrieves a paginated list of categories.
-     */
-    public LiveData<Resource<PageResponse<CategoryDTO>>> getAllCategories(int page, int size) {
-        return categoryRepository.getAllCategories(page, size);
-    }
-
-    /**
-     * Retrieves a paginated list of stores.
-     */
-    public LiveData<Resource<PageResponse<StoreDTO>>> getAllStores(int page, int size) {
-        return storeRepository.getAllStores(page, size);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PetDetailViewModel.java

@@ -0,0 +1,103 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.DropdownDTO;
+import com.example.petstoremobile.dtos.PetDTO;
+import com.example.petstoremobile.repositories.CustomerRepository;
+import com.example.petstoremobile.repositories.PetRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class PetDetailViewModel extends ViewModel {
+    private final PetRepository petRepository;
+    private final CustomerRepository customerRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<PetDTO> petState = new MutableLiveData<>();
+    private final MutableLiveData<List<DropdownDTO>> customerList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<DropdownDTO>> storeList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    
+    private long petId = -1;
+    private boolean isEditing = false;
+
+    @Inject
+    public PetDetailViewModel(PetRepository petRepository, CustomerRepository customerRepository, StoreRepository storeRepository) {
+        this.petRepository = petRepository;
+        this.customerRepository = customerRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public void setPetId(long id) {
+        this.petId = id;
+        this.isEditing = id != -1;
+    }
+
+    public long getPetId() {
+        return petId;
+    }
+
+    public boolean isEditing() {
+        return isEditing;
+    }
+
+    public LiveData<Resource<PetDTO>> loadPet() {
+        return petRepository.getPetById(petId);
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadCustomers() {
+        return customerRepository.getCustomerDropdowns();
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadStores() {
+        return storeRepository.getStoreDropdowns();
+    }
+
+    public LiveData<Resource<PetDTO>> savePet(PetDTO petDTO) {
+        if (isEditing) {
+            petDTO.setPetId(petId);
+            return petRepository.updatePet(petId, petDTO);
+        } else {
+            return petRepository.createPet(petDTO);
+        }
+    }
+
+    public LiveData<Resource<Void>> deletePet() {
+        return petRepository.deletePet(petId);
+    }
+
+    public void setCustomerList(List<DropdownDTO> list) {
+        customerList.setValue(list);
+    }
+
+    public LiveData<List<DropdownDTO>> getCustomerList() {
+        return customerList;
+    }
+
+    public void setStoreList(List<DropdownDTO> list) {
+        storeList.setValue(list);
+    }
+
+    public LiveData<List<DropdownDTO>> getStoreList() {
+        return storeList;
+    }
+
+    public LiveData<Boolean> getIsLoading() {
+        return isLoading;
+    }
+
+    public void setLoading(boolean loading) {
+        isLoading.setValue(loading);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PetListViewModel.java

@@ -0,0 +1,69 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.PetDTO;
+import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.repositories.PetRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class PetListViewModel extends ViewModel {
+    private final PetRepository petRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<List<PetDTO>> pets = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<StoreDTO>> stores = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public PetListViewModel(PetRepository petRepository, StoreRepository storeRepository) {
+        this.petRepository = petRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public LiveData<List<PetDTO>> getPets() { return pets; }
+    public LiveData<List<StoreDTO>> getStores() { return stores; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadPets(String query, String status, String species, Long storeId) {
+        if ("All Statuses".equals(status)) status = null;
+        if ("All Species".equals(species)) species = null;
+
+        isLoading.setValue(true);
+        petRepository.getAllPets(0, 100, query, status, species, storeId, null, "petName").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    pets.setValue(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadStores() {
+        storeRepository.getAllStores(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                stores.setValue(resource.data.getContent());
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeletePets(List<String> ids) {
+        return petRepository.bulkDeletePets(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PetProfileViewModel.java

@@ -0,0 +1,35 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.PetDTO;
+import com.example.petstoremobile.repositories.PetRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+import okhttp3.MultipartBody;
+
+@HiltViewModel
+public class PetProfileViewModel extends ViewModel {
+    private final PetRepository repository;
+
+    @Inject
+    public PetProfileViewModel(PetRepository repository) {
+        this.repository = repository;
+    }
+
+    public LiveData<Resource<PetDTO>> getPetById(Long id) {
+        return repository.getPetById(id);
+    }
+
+    public LiveData<Resource<Void>> uploadPetImage(Long id, MultipartBody.Part image) {
+        return repository.uploadPetImage(id, image);
+    }
+
+    public LiveData<Resource<Void>> deletePetImage(Long id) {
+        return repository.deletePetImage(id);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PetViewModel.java

@@ -1,83 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.PetDTO;
-import com.example.petstoremobile.repositories.PetRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-import okhttp3.MultipartBody;
-
-@HiltViewModel
-public class PetViewModel extends ViewModel {
-    private final PetRepository repository;
-
-    @Inject
-    public PetViewModel(PetRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of pets with filters.
-     */
-    public LiveData<Resource<PageResponse<PetDTO>>> getAllPets(int page, int size, String query, String status, String species, Long storeId, String sort) {
-        return repository.getAllPets(page, size, query, status, species, storeId, sort);
-    }
-
-    /**
-     * Retrieves a single pet by its ID.
-     */
-    public LiveData<Resource<PetDTO>> getPetById(Long id) {
-        return repository.getPetById(id);
-    }
-
-    /**
-     * Creates a new pet record.
-     */
-    public LiveData<Resource<PetDTO>> createPet(PetDTO pet) {
-        return repository.createPet(pet);
-    }
-
-    /**
-     * Updates an existing pet record by ID.
-     */
-    public LiveData<Resource<PetDTO>> updatePet(Long id, PetDTO pet) {
-        return repository.updatePet(id, pet);
-    }
-
-    /**
-     * Deletes a pet record by ID.
-     */
-    public LiveData<Resource<Void>> deletePet(Long id) {
-        return repository.deletePet(id);
-    }
-
-    /**
-     * Deletes multiple pet records.
-     */
-    public LiveData<Resource<Void>> bulkDeletePets(List<String> ids) {
-        return repository.bulkDeletePets(new BulkDeleteRequest(ids));
-    }
-
-    /**
-     * Uploads an image for a specific pet.
-     */
-    public LiveData<Resource<Void>> uploadPetImage(Long id, MultipartBody.Part image) {
-        return repository.uploadPetImage(id, image);
-    }
-
-    /**
-     * Deletes the image associated with a specific pet.
-     */
-    public LiveData<Resource<Void>> deletePetImage(Long id) {
-        return repository.deletePetImage(id);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductDetailViewModel.java

@@ -0,0 +1,85 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.CategoryDTO;
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.ProductDTO;
+import com.example.petstoremobile.repositories.CategoryRepository;
+import com.example.petstoremobile.repositories.ProductRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+import okhttp3.MultipartBody;
+
+@HiltViewModel
+public class ProductDetailViewModel extends ViewModel {
+    private final ProductRepository productRepository;
+    private final CategoryRepository categoryRepository;
+
+    private final MutableLiveData<List<CategoryDTO>> categoryList = new MutableLiveData<>(new ArrayList<>());
+    private long prodId = -1;
+    private boolean isEditing = false;
+
+    @Inject
+    public ProductDetailViewModel(ProductRepository productRepository, CategoryRepository categoryRepository) {
+        this.productRepository = productRepository;
+        this.categoryRepository = categoryRepository;
+    }
+
+    public void setProdId(long id) {
+        this.prodId = id;
+        this.isEditing = id != -1;
+    }
+
+    public long getProdId() {
+        return prodId;
+    }
+
+    public boolean isEditing() {
+        return isEditing;
+    }
+
+    public LiveData<Resource<PageResponse<CategoryDTO>>> loadCategories() {
+        return categoryRepository.getAllCategories(0, 100);
+    }
+
+    public LiveData<Resource<ProductDTO>> loadProduct() {
+        return productRepository.getProductById(prodId);
+    }
+
+    public LiveData<Resource<ProductDTO>> saveProduct(ProductDTO dto) {
+        if (isEditing) {
+            return productRepository.updateProduct(prodId, dto);
+        } else {
+            return productRepository.createProduct(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteProduct() {
+        return productRepository.deleteProduct(prodId);
+    }
+
+    public LiveData<Resource<Void>> uploadProductImage(MultipartBody.Part image) {
+        return productRepository.uploadProductImage(prodId, image);
+    }
+
+    public LiveData<Resource<Void>> deleteProductImage() {
+        return productRepository.deleteProductImage(prodId);
+    }
+
+    public void setCategoryList(List<CategoryDTO> list) {
+        categoryList.setValue(list);
+    }
+
+    public LiveData<List<CategoryDTO>> getCategoryList() {
+        return categoryList;
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductListViewModel.java

@@ -0,0 +1,60 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.CategoryDTO;
+import com.example.petstoremobile.dtos.ProductDTO;
+import com.example.petstoremobile.repositories.CategoryRepository;
+import com.example.petstoremobile.repositories.ProductRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class ProductListViewModel extends ViewModel {
+    private final ProductRepository productRepository;
+    private final CategoryRepository categoryRepository;
+
+    private final MutableLiveData<List<ProductDTO>> products = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<CategoryDTO>> categories = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public ProductListViewModel(ProductRepository productRepository, CategoryRepository categoryRepository) {
+        this.productRepository = productRepository;
+        this.categoryRepository = categoryRepository;
+    }
+
+    public LiveData<List<ProductDTO>> getProducts() { return products; }
+    public LiveData<List<CategoryDTO>> getCategories() { return categories; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadProducts(String query, Long categoryId) {
+        isLoading.setValue(true);
+        productRepository.getAllProducts(query, categoryId, 0, 100, "prodName").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    products.setValue(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadCategories() {
+        categoryRepository.getAllCategories(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                categories.setValue(resource.data.getContent());
+            }
+        });
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductSupplierDetailViewModel.java

@@ -0,0 +1,78 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.ProductDTO;
+import com.example.petstoremobile.dtos.ProductSupplierDTO;
+import com.example.petstoremobile.dtos.SupplierDTO;
+import com.example.petstoremobile.repositories.ProductRepository;
+import com.example.petstoremobile.repositories.ProductSupplierRepository;
+import com.example.petstoremobile.repositories.SupplierRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class ProductSupplierDetailViewModel extends ViewModel {
+    private final ProductSupplierRepository psRepository;
+    private final ProductRepository productRepository;
+    private final SupplierRepository supplierRepository;
+
+    private boolean isEditing = false;
+    private long editProductId = -1;
+    private long editSupplierId = -1;
+
+    private final MutableLiveData<List<ProductDTO>> productList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<SupplierDTO>> supplierList = new MutableLiveData<>(new ArrayList<>());
+
+    @Inject
+    public ProductSupplierDetailViewModel(ProductSupplierRepository psRepository, ProductRepository productRepository, SupplierRepository supplierRepository) {
+        this.psRepository = psRepository;
+        this.productRepository = productRepository;
+        this.supplierRepository = supplierRepository;
+    }
+
+    public void setEditMode(long productId, long supplierId) {
+        this.isEditing = true;
+        this.editProductId = productId;
+        this.editSupplierId = supplierId;
+    }
+
+    public boolean isEditing() { return isEditing; }
+    public long getEditProductId() { return editProductId; }
+    public long getEditSupplierId() { return editSupplierId; }
+
+    public LiveData<Resource<PageResponse<ProductDTO>>> loadProducts() {
+        return productRepository.getAllProducts(null, null, 0, 200, "prodName");
+    }
+
+    public LiveData<Resource<PageResponse<SupplierDTO>>> loadSuppliers() {
+        return supplierRepository.getAllSuppliers(0, 200, null, "supCompany");
+    }
+
+    public LiveData<Resource<ProductSupplierDTO>> saveProductSupplier(ProductSupplierDTO dto) {
+        if (isEditing) {
+            return psRepository.updateProductSupplier(editProductId, editSupplierId, dto);
+        } else {
+            return psRepository.createProductSupplier(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteProductSupplier() {
+        return psRepository.deleteProductSupplier(editProductId, editSupplierId);
+    }
+
+    public void setProductList(List<ProductDTO> list) { productList.setValue(list); }
+    public LiveData<List<ProductDTO>> getProductList() { return productList; }
+
+    public void setSupplierList(List<SupplierDTO> list) { supplierList.setValue(list); }
+    public LiveData<List<SupplierDTO>> getSupplierList() { return supplierList; }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductSupplierListViewModel.java

@@ -0,0 +1,77 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.ProductDTO;
+import com.example.petstoremobile.dtos.ProductSupplierDTO;
+import com.example.petstoremobile.dtos.SupplierDTO;
+import com.example.petstoremobile.repositories.ProductRepository;
+import com.example.petstoremobile.repositories.ProductSupplierRepository;
+import com.example.petstoremobile.repositories.SupplierRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class ProductSupplierListViewModel extends ViewModel {
+    private final ProductSupplierRepository psRepository;
+    private final ProductRepository productRepository;
+    private final SupplierRepository supplierRepository;
+
+    private final MutableLiveData<List<ProductSupplierDTO>> productSuppliers = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<ProductDTO>> products = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<SupplierDTO>> suppliers = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public ProductSupplierListViewModel(ProductSupplierRepository psRepository, ProductRepository productRepository, SupplierRepository supplierRepository) {
+        this.psRepository = psRepository;
+        this.productRepository = productRepository;
+        this.supplierRepository = supplierRepository;
+    }
+
+    public LiveData<List<ProductSupplierDTO>> getProductSuppliers() { return productSuppliers; }
+    public LiveData<List<ProductDTO>> getProducts() { return products; }
+    public LiveData<List<SupplierDTO>> getSuppliers() { return suppliers; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadProductSuppliers(String query, Long productId, Long supplierId) {
+        isLoading.setValue(true);
+        psRepository.getAllProductSuppliers(0, 100, query, productId, supplierId, "productName").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    productSuppliers.setValue(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadFilterData() {
+        productRepository.getAllProducts(null, null, 0, 100, "prodName").observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                products.setValue(resource.data.getContent());
+            }
+        });
+
+        supplierRepository.getAllSuppliers(0, 100, null, "supCompany").observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                suppliers.setValue(resource.data.getContent());
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeleteProductSuppliers(List<String> ids) {
+        return psRepository.bulkDeleteProductSuppliers(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductSupplierViewModel.java

@@ -1,58 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.ProductSupplierDTO;
-import com.example.petstoremobile.repositories.ProductSupplierRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class ProductSupplierViewModel extends ViewModel {
-    private final ProductSupplierRepository repository;
-
-    @Inject
-    public ProductSupplierViewModel(ProductSupplierRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all product-supplier relationships.
-     */
-    public LiveData<Resource<PageResponse<ProductSupplierDTO>>> getAllProductSuppliers(int page, int size, String query, Long productId, Long supplierId, String sort) {
-        return repository.getAllProductSuppliers(page, size, query, productId, supplierId, sort);
-    }
-
-    /**
-     * Creates a new product-supplier relationship.
-     */
-    public LiveData<Resource<ProductSupplierDTO>> createProductSupplier(ProductSupplierDTO dto) {
-        return repository.createProductSupplier(dto);
-    }
-
-    /**
-     * Updates an existing product-supplier relationship.
-     */
-    public LiveData<Resource<ProductSupplierDTO>> updateProductSupplier(Long productId, Long supplierId, ProductSupplierDTO dto) {
-        return repository.updateProductSupplier(productId, supplierId, dto);
-    }
-
-    /**
-     * Deletes a product-supplier relationship by product and supplier IDs.
-     */
-    public LiveData<Resource<Void>> deleteProductSupplier(Long productId, Long supplierId) {
-        return repository.deleteProductSupplier(productId, supplierId);
-    }
-
-    public LiveData<Resource<Void>> bulkDeleteProductSuppliers(List<String> ids) {
-        return repository.bulkDeleteProductSuppliers(new BulkDeleteRequest(ids));
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductViewModel.java

@@ -1,84 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.CategoryDTO;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.ProductDTO;
-import com.example.petstoremobile.repositories.CategoryRepository;
-import com.example.petstoremobile.repositories.ProductRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-import okhttp3.MultipartBody;
-
-@HiltViewModel
-public class ProductViewModel extends ViewModel {
-    private final ProductRepository productRepository;
-    private final CategoryRepository categoryRepository;
-
-    @Inject
-    public ProductViewModel(ProductRepository productRepository, CategoryRepository categoryRepository) {
-        this.productRepository = productRepository;
-        this.categoryRepository = categoryRepository;
-    }
-
-    /**
-     * Retrieves a paginated list of products, optionally filtered by a query string, category and sorted.
-     */
-    public LiveData<Resource<PageResponse<ProductDTO>>> getAllProducts(String query, Long categoryId, int page, int size, String sort) {
-        return productRepository.getAllProducts(query, categoryId, page, size, sort);
-    }
-
-    /**
-     * Retrieves a single product by its ID.
-     */
-    public LiveData<Resource<ProductDTO>> getProductById(Long id) {
-        return productRepository.getProductById(id);
-    }
-
-    /**
-     * Creates a new product.
-     */
-    public LiveData<Resource<ProductDTO>> createProduct(ProductDTO product) {
-        return productRepository.createProduct(product);
-    }
-
-    /**
-     * Updates an existing product by ID.
-     */
-    public LiveData<Resource<ProductDTO>> updateProduct(Long id, ProductDTO product) {
-        return productRepository.updateProduct(id, product);
-    }
-
-    /**
-     * Deletes a product by its ID.
-     */
-    public LiveData<Resource<Void>> deleteProduct(Long id) {
-        return productRepository.deleteProduct(id);
-    }
-
-    /**
-     * Uploads an image for a specific product.
-     */
-    public LiveData<Resource<Void>> uploadProductImage(Long id, MultipartBody.Part image) {
-        return productRepository.uploadProductImage(id, image);
-    }
-
-    /**
-     * Deletes the image associated with a specific product.
-     */
-    public LiveData<Resource<Void>> deleteProductImage(Long id) {
-        return productRepository.deleteProductImage(id);
-    }
-
-    /**
-     * Retrieves a paginated list of all product categories.
-     */
-    public LiveData<Resource<PageResponse<CategoryDTO>>> getAllCategories(int page, int size) {
-        return categoryRepository.getAllCategories(page, size);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PurchaseOrderDetailViewModel.java

@@ -0,0 +1,26 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.PurchaseOrderDTO;
+import com.example.petstoremobile.repositories.PurchaseOrderRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class PurchaseOrderDetailViewModel extends ViewModel {
+    private final PurchaseOrderRepository repository;
+
+    @Inject
+    public PurchaseOrderDetailViewModel(PurchaseOrderRepository repository) {
+        this.repository = repository;
+    }
+
+    public LiveData<Resource<PurchaseOrderDTO>> loadPurchaseOrder(long id) {
+        return repository.getPurchaseOrderById(id);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PurchaseOrderListViewModel.java

@@ -0,0 +1,60 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.PurchaseOrderDTO;
+import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.repositories.PurchaseOrderRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class PurchaseOrderListViewModel extends ViewModel {
+    private final PurchaseOrderRepository purchaseOrderRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<List<PurchaseOrderDTO>> purchaseOrders = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<StoreDTO>> stores = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public PurchaseOrderListViewModel(PurchaseOrderRepository purchaseOrderRepository, StoreRepository storeRepository) {
+        this.purchaseOrderRepository = purchaseOrderRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public LiveData<List<PurchaseOrderDTO>> getPurchaseOrders() { return purchaseOrders; }
+    public LiveData<List<StoreDTO>> getStores() { return stores; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadPurchaseOrders(String query, Long storeId) {
+        isLoading.setValue(true);
+        purchaseOrderRepository.getAllPurchaseOrders(0, 100, query, storeId, "purchaseOrderId,desc").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    purchaseOrders.setValue(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadStores() {
+        storeRepository.getAllStores(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                stores.setValue(resource.data.getContent());
+            }
+        });
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/PurchaseOrderViewModel.java

@@ -1,37 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.PurchaseOrderDTO;
-import com.example.petstoremobile.repositories.PurchaseOrderRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class PurchaseOrderViewModel extends ViewModel {
-    private final PurchaseOrderRepository repository;
-
-    @Inject
-    public PurchaseOrderViewModel(PurchaseOrderRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all purchase orders.
-     */
-    public LiveData<Resource<PageResponse<PurchaseOrderDTO>>> getAllPurchaseOrders(int page, int size, String query, Long storeId, String sort) {
-        return repository.getAllPurchaseOrders(page, size, query, storeId, sort);
-    }
-
-    /**
-     * Retrieves a single purchase order by its ID.
-     */
-    public LiveData<Resource<PurchaseOrderDTO>> getPurchaseOrderById(Long id) {
-        return repository.getPurchaseOrderById(id);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/RefundViewModel.java

@@ -0,0 +1,167 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.SaleDTO;
+import com.example.petstoremobile.repositories.SaleRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class RefundViewModel extends ViewModel {
+    private final SaleRepository saleRepository;
+
+    private final MutableLiveData<List<SaleDTO>> allSales = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<SaleDTO> currentSale = new MutableLiveData<>();
+    private final MutableLiveData<List<RefundItem>> availableItems = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<RefundItem>> refundCart = new MutableLiveData<>(new ArrayList<>());
+
+    @Inject
+    public RefundViewModel(SaleRepository saleRepository) {
+        this.saleRepository = saleRepository;
+    }
+
+    public LiveData<Resource<PageResponse<SaleDTO>>> loadAllSales() {
+        return saleRepository.getAllSales(0, 1000, null, null, null, "saleDate,desc");
+    }
+
+    public void setAllSales(List<SaleDTO> sales) {
+        allSales.setValue(sales);
+    }
+
+    public List<SaleDTO> getAllSalesList() {
+        return allSales.getValue();
+    }
+
+    public void setCurrentSale(SaleDTO sale) {
+        currentSale.setValue(sale);
+        buildRefundableItems();
+    }
+
+    public SaleDTO getCurrentSale() {
+        return currentSale.getValue();
+    }
+
+    public LiveData<List<RefundItem>> getAvailableItems() {
+        return availableItems;
+    }
+
+    public LiveData<List<RefundItem>> getRefundCart() {
+        return refundCart;
+    }
+
+    private void buildRefundableItems() {
+        SaleDTO sale = currentSale.getValue();
+        List<SaleDTO> sales = allSales.getValue();
+        if (sale == null || sales == null || sale.getItems() == null) {
+            availableItems.setValue(new ArrayList<>());
+            return;
+        }
+
+        Map<Long, Integer> alreadyRefunded = new HashMap<>();
+        for (SaleDTO s : sales) {
+            if (Boolean.TRUE.equals(s.getIsRefund())
+                    && sale.getSaleId().equals(s.getOriginalSaleId())
+                    && s.getItems() != null) {
+                for (SaleDTO.SaleItemDTO item : s.getItems()) {
+                    if (item.getProdId() != null && item.getQuantity() != null) {
+                        alreadyRefunded.merge(item.getProdId(),
+                                Math.abs(item.getQuantity()), Integer::sum);
+                    }
+                }
+            }
+        }
+
+        List<RefundItem> items = new ArrayList<>();
+        for (SaleDTO.SaleItemDTO item : sale.getItems()) {
+            if (item.getProdId() == null || item.getQuantity() == null) continue;
+            int refunded = alreadyRefunded.getOrDefault(item.getProdId(), 0);
+            int remaining = item.getQuantity() - refunded;
+            if (remaining > 0) {
+                items.add(new RefundItem(
+                        item.getProdId(),
+                        item.getProductName() != null ? item.getProductName() : "Unknown",
+                        remaining,
+                        item.getUnitPrice()
+                ));
+            }
+        }
+        availableItems.setValue(items);
+        refundCart.setValue(new ArrayList<>());
+    }
+
+    public void addToCart(RefundItem item, int qty) {
+        List<RefundItem> cart = new ArrayList<>(refundCart.getValue());
+        boolean merged = false;
+        for (int i = 0; i < cart.size(); i++) {
+            if (cart.get(i).prodId == item.prodId) {
+                RefundItem existing = cart.get(i);
+                cart.set(i, new RefundItem(existing.prodId, existing.productName, existing.quantity + qty, existing.unitPrice));
+                merged = true;
+                break;
+            }
+        }
+        if (!merged) {
+            cart.add(new RefundItem(item.prodId, item.productName, qty, item.unitPrice));
+        }
+        refundCart.setValue(cart);
+    }
+
+    public void removeFromCart(RefundItem item) {
+        List<RefundItem> cart = new ArrayList<>(refundCart.getValue());
+        cart.remove(item);
+        refundCart.setValue(cart);
+    }
+
+    public LiveData<Resource<SaleDTO>> submitRefund(String paymentMethod) {
+        SaleDTO sale = currentSale.getValue();
+        List<RefundItem> cart = refundCart.getValue();
+        if (sale == null || cart == null || cart.isEmpty()) return null;
+
+        List<SaleDTO.SaleItemDTO> items = new ArrayList<>();
+        for (RefundItem item : cart) {
+            items.add(new SaleDTO.SaleItemDTO(item.prodId, -item.quantity));
+        }
+
+        SaleDTO dto = new SaleDTO(
+                sale.getStoreId(),
+                paymentMethod,
+                items,
+                true,
+                sale.getSaleId(),
+                null
+        );
+
+        return saleRepository.createSale(dto);
+    }
+
+    public static class RefundItem {
+        public long prodId;
+        public String productName;
+        public int quantity;
+        public BigDecimal unitPrice;
+
+        public RefundItem(long prodId, String productName, int quantity, BigDecimal unitPrice) {
+            this.prodId = prodId;
+            this.productName = productName;
+            this.quantity = quantity;
+            this.unitPrice = unitPrice;
+        }
+
+        public BigDecimal getTotal() {
+            return unitPrice != null ? unitPrice.multiply(BigDecimal.valueOf(quantity)) : BigDecimal.ZERO;
+        }
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/SaleDetailViewModel.java

@@ -0,0 +1,118 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.DropdownDTO;
+import com.example.petstoremobile.dtos.ProductDTO;
+import com.example.petstoremobile.dtos.SaleDTO;
+import com.example.petstoremobile.repositories.CustomerRepository;
+import com.example.petstoremobile.repositories.ProductRepository;
+import com.example.petstoremobile.repositories.SaleRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class SaleDetailViewModel extends ViewModel {
+    private final SaleRepository saleRepository;
+    private final StoreRepository storeRepository;
+    private final CustomerRepository customerRepository;
+    private final ProductRepository productRepository;
+
+    private long saleId = -1;
+    private boolean viewOnly = false;
+
+    private final MutableLiveData<List<DropdownDTO>> storeList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<DropdownDTO>> customerList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<ProductDTO>> productList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<SaleDTO.SaleItemDTO>> cartItems = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public SaleDetailViewModel(SaleRepository saleRepository, StoreRepository storeRepository,
+                               CustomerRepository customerRepository, ProductRepository productRepository) {
+        this.saleRepository = saleRepository;
+        this.storeRepository = storeRepository;
+        this.customerRepository = customerRepository;
+        this.productRepository = productRepository;
+    }
+
+    public void setSaleId(long id, boolean viewOnly) {
+        this.saleId = id;
+        this.viewOnly = viewOnly;
+    }
+
+    public long getSaleId() { return saleId; }
+    public boolean isViewOnly() { return viewOnly; }
+
+    public LiveData<Resource<SaleDTO>> loadSaleDetails() {
+        return saleRepository.getSaleById(saleId);
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadStores() {
+        return storeRepository.getStoreDropdowns();
+    }
+
+    public LiveData<Resource<List<DropdownDTO>>> loadCustomers() {
+        return customerRepository.getCustomerDropdowns();
+    }
+
+    public LiveData<Resource<com.example.petstoremobile.dtos.PageResponse<ProductDTO>>> loadProducts() {
+        return productRepository.getAllProducts(null, null, 0, 200, null);
+    }
+
+    public LiveData<Resource<SaleDTO>> createSale(SaleDTO sale) {
+        return saleRepository.createSale(sale);
+    }
+
+    public void setStoreList(List<DropdownDTO> list) { storeList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getStoreList() { return storeList; }
+
+    public void setCustomerList(List<DropdownDTO> list) { customerList.setValue(list); }
+    public LiveData<List<DropdownDTO>> getCustomerList() { return customerList; }
+
+    public void setProductList(List<ProductDTO> list) { productList.setValue(list); }
+    public LiveData<List<ProductDTO>> getProductList() { return productList; }
+
+    public void addToCart(SaleDTO.SaleItemDTO item) {
+        List<SaleDTO.SaleItemDTO> currentCart = new ArrayList<>(cartItems.getValue());
+        currentCart.add(item);
+        cartItems.setValue(currentCart);
+    }
+
+    public LiveData<List<SaleDTO.SaleItemDTO>> getCartItems() { return cartItems; }
+
+    public BigDecimal calculateSubtotal() {
+        BigDecimal total = BigDecimal.ZERO;
+        List<SaleDTO.SaleItemDTO> items = cartItems.getValue();
+        List<ProductDTO> products = productList.getValue();
+        if (items != null && products != null) {
+            for (SaleDTO.SaleItemDTO item : items) {
+                for (ProductDTO p : products) {
+                    if (p.getProdId().equals(item.getProdId()) && p.getProdPrice() != null) {
+                        total = total.add(p.getProdPrice().multiply(BigDecimal.valueOf(item.getQuantity())));
+                        break;
+                    }
+                }
+            }
+        }
+        return total;
+    }
+
+    public LiveData<Boolean> getIsLoading() {
+        return isLoading;
+    }
+
+    public void setLoading(boolean loading) {
+        isLoading.setValue(loading);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/SaleListViewModel.java

@@ -0,0 +1,77 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.SaleDTO;
+import com.example.petstoremobile.dtos.StoreDTO;
+import com.example.petstoremobile.repositories.SaleRepository;
+import com.example.petstoremobile.repositories.StoreRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class SaleListViewModel extends ViewModel {
+    private final SaleRepository saleRepository;
+    private final StoreRepository storeRepository;
+
+    private final MutableLiveData<List<SaleDTO>> sales = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<StoreDTO>> stores = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    
+    private int currentPage = 0;
+    private boolean isLastPage = false;
+    private static final int PAGE_SIZE = 20;
+
+    @Inject
+    public SaleListViewModel(SaleRepository saleRepository, StoreRepository storeRepository) {
+        this.saleRepository = saleRepository;
+        this.storeRepository = storeRepository;
+    }
+
+    public LiveData<List<SaleDTO>> getSales() { return sales; }
+    public LiveData<List<StoreDTO>> getStores() { return stores; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+    public boolean isLastPage() { return isLastPage; }
+
+    public void loadSales(boolean reset, String query, String paymentMethod, Long storeId) {
+        if (isLoading.getValue() != null && isLoading.getValue() && !reset) return;
+
+        if (reset) {
+            currentPage = 0;
+            isLastPage = false;
+        }
+
+        isLoading.setValue(true);
+        saleRepository.getAllSales(currentPage, PAGE_SIZE, query, paymentMethod, storeId, "saleDate,desc").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    List<SaleDTO> currentList = reset ? new ArrayList<>() : new ArrayList<>(sales.getValue());
+                    currentList.addAll(resource.data.getContent());
+                    sales.setValue(currentList);
+                    isLastPage = resource.data.isLast();
+                    if (!isLastPage) currentPage++;
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void loadStores() {
+        storeRepository.getAllStores(0, 100).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                stores.setValue(resource.data.getContent());
+            }
+        });
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/SaleViewModel.java

@@ -1,35 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.SaleDTO;
-import com.example.petstoremobile.repositories.SaleRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class SaleViewModel extends ViewModel {
-    private final SaleRepository saleRepository;
-
-    @Inject
-    public SaleViewModel(SaleRepository saleRepository) {
-        this.saleRepository = saleRepository;
-    }
-
-    public LiveData<Resource<PageResponse<SaleDTO>>> getAllSales(int page, int size, String query, String paymentMethod, Long storeId, String sortBy) {
-        return saleRepository.getAllSales(page, size, query, paymentMethod, storeId, sortBy);
-    }
-
-    public LiveData<Resource<SaleDTO>> getSaleById(Long id) {
-        return saleRepository.getSaleById(id);
-    }
-
-    public LiveData<Resource<SaleDTO>> createSale(SaleDTO sale) {
-        return saleRepository.createSale(sale);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ServiceDetailViewModel.java

@@ -0,0 +1,54 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.ServiceDTO;
+import com.example.petstoremobile.repositories.ServiceRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class ServiceDetailViewModel extends ViewModel {
+    private final ServiceRepository repository;
+    private long serviceId = -1;
+    private boolean isEditing = false;
+
+    @Inject
+    public ServiceDetailViewModel(ServiceRepository repository) {
+        this.repository = repository;
+    }
+
+    public void setServiceId(long id) {
+        this.serviceId = id;
+        this.isEditing = id != -1;
+    }
+
+    public long getServiceId() {
+        return serviceId;
+    }
+
+    public boolean isEditing() {
+        return isEditing;
+    }
+
+    public LiveData<Resource<ServiceDTO>> loadService() {
+        return repository.getServiceById(serviceId);
+    }
+
+    public LiveData<Resource<ServiceDTO>> saveService(ServiceDTO dto) {
+        if (isEditing) {
+            dto.setServiceId(serviceId);
+            return repository.updateService(serviceId, dto);
+        } else {
+            return repository.createService(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteService() {
+        return repository.deleteService(serviceId);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ServiceListViewModel.java

@@ -0,0 +1,68 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.PageResponse;
+import com.example.petstoremobile.dtos.ServiceDTO;
+import com.example.petstoremobile.repositories.ServiceRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class ServiceListViewModel extends ViewModel {
+    private final ServiceRepository repository;
+
+    private final MutableLiveData<List<ServiceDTO>> services = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    
+    private int currentPage = 0;
+    private boolean isLastPage = false;
+    private static final int PAGE_SIZE = 20;
+
+    @Inject
+    public ServiceListViewModel(ServiceRepository repository) {
+        this.repository = repository;
+    }
+
+    public LiveData<List<ServiceDTO>> getServices() { return services; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+    public boolean isLastPage() { return isLastPage; }
+
+    public void loadServices(boolean reset, String query) {
+        if (isLoading.getValue() != null && isLoading.getValue() && !reset) return;
+
+        if (reset) {
+            currentPage = 0;
+            isLastPage = false;
+        }
+
+        isLoading.setValue(true);
+        repository.getAllServices(currentPage, PAGE_SIZE, query, "serviceName").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    List<ServiceDTO> currentList = reset ? new ArrayList<>() : new ArrayList<>(services.getValue());
+                    currentList.addAll(resource.data.getContent());
+                    services.setValue(currentList);
+                    isLastPage = resource.data.isLast();
+                    if (!isLastPage) currentPage++;
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeleteServices(List<String> ids) {
+        return repository.bulkDeleteServices(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/ServiceViewModel.java

@@ -1,68 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.ServiceDTO;
-import com.example.petstoremobile.repositories.ServiceRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class ServiceViewModel extends ViewModel {
-    private final ServiceRepository repository;
-
-    @Inject
-    public ServiceViewModel(ServiceRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all services.
-     */
-    public LiveData<Resource<PageResponse<ServiceDTO>>> getAllServices(int page, int size, String query, String sort) {
-        return repository.getAllServices(page, size, query, sort);
-    }
-
-    /**
-     * Retrieves a single service by its ID.
-     */
-    public LiveData<Resource<ServiceDTO>> getServiceById(Long id) {
-        return repository.getServiceById(id);
-    }
-
-    /**
-     * Creates a new service.
-     */
-    public LiveData<Resource<ServiceDTO>> createService(ServiceDTO service) {
-        return repository.createService(service);
-    }
-
-    /**
-     * Updates an existing service by ID.
-     */
-    public LiveData<Resource<ServiceDTO>> updateService(Long id, ServiceDTO service) {
-        return repository.updateService(id, service);
-    }
-
-    /**
-     * Deletes a service by ID.
-     */
-    public LiveData<Resource<Void>> deleteService(Long id) {
-        return repository.deleteService(id);
-    }
-
-    /**
-     * Deletes multiple services.
-     */
-    public LiveData<Resource<Void>> bulkDeleteServices(List<String> ids) {
-        return repository.bulkDeleteServices(new BulkDeleteRequest(ids));
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/StaffDetailViewModel.java

@@ -0,0 +1,49 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.EmployeeDTO;
+import com.example.petstoremobile.repositories.EmployeeRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class StaffDetailViewModel extends ViewModel {
+    private final EmployeeRepository repository;
+    private long employeeId = -1;
+    private boolean isEditing = false;
+
+    @Inject
+    public StaffDetailViewModel(EmployeeRepository repository) {
+        this.repository = repository;
+    }
+
+    public void setEmployeeId(long id, boolean isEditing) {
+        this.employeeId = id;
+        this.isEditing = isEditing;
+    }
+
+    public long getEmployeeId() {
+        return employeeId;
+    }
+
+    public boolean isEditing() {
+        return isEditing;
+    }
+
+    public LiveData<Resource<EmployeeDTO>> saveEmployee(EmployeeDTO dto) {
+        if (isEditing && employeeId > 0) {
+            return repository.updateEmployee(employeeId, dto);
+        } else {
+            return repository.createEmployee(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteEmployee() {
+        return repository.deleteEmployee(employeeId);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/StaffListViewModel.java

@@ -0,0 +1,71 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.EmployeeDTO;
+import com.example.petstoremobile.repositories.EmployeeRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class StaffListViewModel extends ViewModel {
+    private final EmployeeRepository repository;
+
+    private final MutableLiveData<List<EmployeeDTO>> employees = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<List<EmployeeDTO>> filteredEmployees = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+    private String lastQuery = "";
+
+    @Inject
+    public StaffListViewModel(EmployeeRepository repository) {
+        this.repository = repository;
+    }
+
+    public LiveData<List<EmployeeDTO>> getFilteredEmployees() { return filteredEmployees; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadStaff() {
+        isLoading.setValue(true);
+        repository.getAllEmployees(0, 100).observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    employees.setValue(resource.data.getContent());
+                    filter(lastQuery);
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public void filter(String query) {
+        this.lastQuery = query;
+        List<EmployeeDTO> all = employees.getValue();
+        if (all == null) return;
+
+        if (query.isEmpty()) {
+            filteredEmployees.setValue(new ArrayList<>(all));
+        } else {
+            List<EmployeeDTO> filtered = new ArrayList<>();
+            String lower = query.toLowerCase();
+            for (EmployeeDTO e : all) {
+                if ((e.getFullName() != null && e.getFullName().toLowerCase().contains(lower))
+                        || (e.getUsername() != null && e.getUsername().toLowerCase().contains(lower))
+                        || (e.getEmail() != null && e.getEmail().toLowerCase().contains(lower))
+                        || (e.getPhone() != null && e.getPhone().toLowerCase().contains(lower))) {
+                    filtered.add(e);
+                }
+            }
+            filteredEmployees.setValue(filtered);
+        }
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/StoreViewModel.java

@@ -1,30 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.StoreDTO;
-import com.example.petstoremobile.repositories.StoreRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class StoreViewModel extends ViewModel {
-    private final StoreRepository repository;
-
-    @Inject
-    public StoreViewModel(StoreRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all stores.
-     */
-    public LiveData<Resource<PageResponse<StoreDTO>>> getAllStores(int page, int size) {
-        return repository.getAllStores(page, size);
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/SupplierDetailViewModel.java

@@ -0,0 +1,54 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.SupplierDTO;
+import com.example.petstoremobile.repositories.SupplierRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class SupplierDetailViewModel extends ViewModel {
+    private final SupplierRepository repository;
+    private long supId = -1;
+    private boolean isEditing = false;
+
+    @Inject
+    public SupplierDetailViewModel(SupplierRepository repository) {
+        this.repository = repository;
+    }
+
+    public void setSupId(long id) {
+        this.supId = id;
+        this.isEditing = id != -1;
+    }
+
+    public long getSupId() {
+        return supId;
+    }
+
+    public boolean isEditing() {
+        return isEditing;
+    }
+
+    public LiveData<Resource<SupplierDTO>> loadSupplier() {
+        return repository.getSupplierById(supId);
+    }
+
+    public LiveData<Resource<SupplierDTO>> saveSupplier(SupplierDTO dto) {
+        if (isEditing) {
+            dto.setSupId(supId);
+            return repository.updateSupplier(supId, dto);
+        } else {
+            return repository.createSupplier(dto);
+        }
+    }
+
+    public LiveData<Resource<Void>> deleteSupplier() {
+        return repository.deleteSupplier(supId);
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/SupplierListViewModel.java

@@ -0,0 +1,51 @@
+package com.example.petstoremobile.viewmodels;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+import com.example.petstoremobile.dtos.BulkDeleteRequest;
+import com.example.petstoremobile.dtos.SupplierDTO;
+import com.example.petstoremobile.repositories.SupplierRepository;
+import com.example.petstoremobile.utils.Resource;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.lifecycle.HiltViewModel;
+
+@HiltViewModel
+public class SupplierListViewModel extends ViewModel {
+    private final SupplierRepository repository;
+
+    private final MutableLiveData<List<SupplierDTO>> suppliers = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
+
+    @Inject
+    public SupplierListViewModel(SupplierRepository repository) {
+        this.repository = repository;
+    }
+
+    public LiveData<List<SupplierDTO>> getSuppliers() { return suppliers; }
+    public LiveData<Boolean> getIsLoading() { return isLoading; }
+
+    public void loadSuppliers(String query) {
+        isLoading.setValue(true);
+        repository.getAllSuppliers(0, 100, query, "supCompany").observeForever(resource -> {
+            if (resource != null) {
+                if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                    suppliers.setValue(resource.data.getContent());
+                    isLoading.setValue(false);
+                } else if (resource.status == Resource.Status.ERROR) {
+                    isLoading.setValue(false);
+                }
+            }
+        });
+    }
+
+    public LiveData<Resource<Void>> bulkDeleteSuppliers(List<String> ids) {
+        return repository.bulkDeleteSuppliers(new BulkDeleteRequest(ids));
+    }
+}

android/app/src/main/java/com/example/petstoremobile/viewmodels/SupplierViewModel.java

@@ -1,68 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.BulkDeleteRequest;
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.SupplierDTO;
-import com.example.petstoremobile.repositories.SupplierRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class SupplierViewModel extends ViewModel {
-    private final SupplierRepository repository;
-
-    @Inject
-    public SupplierViewModel(SupplierRepository repository) {
-        this.repository = repository;
-    }
-
-    /**
-     * Fetches a paginated list of all suppliers.
-     */
-    public LiveData<Resource<PageResponse<SupplierDTO>>> getAllSuppliers(int page, int size, String query, String sort) {
-        return repository.getAllSuppliers(page, size, query, sort);
-    }
-
-    /**
-     * Retrieves a single supplier by its ID.
-     */
-    public LiveData<Resource<SupplierDTO>> getSupplierById(Long id) {
-        return repository.getSupplierById(id);
-    }
-
-    /**
-     * Creates a new supplier record.
-     */
-    public LiveData<Resource<SupplierDTO>> createSupplier(SupplierDTO supplier) {
-        return repository.createSupplier(supplier);
-    }
-
-    /**
-     * Updates an existing supplier record by ID.
-     */
-    public LiveData<Resource<SupplierDTO>> updateSupplier(Long id, SupplierDTO supplier) {
-        return repository.updateSupplier(id, supplier);
-    }
-
-    /**
-     * Deletes a supplier record by ID.
-     */
-    public LiveData<Resource<Void>> deleteSupplier(Long id) {
-        return repository.deleteSupplier(id);
-    }
-
-    /**
-     * Deletes multiple supplier records.
-     */
-    public LiveData<Resource<Void>> bulkDeleteSuppliers(List<String> ids) {
-        return repository.bulkDeleteSuppliers(new BulkDeleteRequest(ids));
-    }
-}

android/app/src/main/java/com/example/petstoremobile/viewmodels/UserViewModel.java

@@ -1,27 +0,0 @@
-package com.example.petstoremobile.viewmodels;
-
-import androidx.lifecycle.LiveData;
-import androidx.lifecycle.ViewModel;
-
-import com.example.petstoremobile.dtos.PageResponse;
-import com.example.petstoremobile.dtos.UserDTO;
-import com.example.petstoremobile.repositories.UserRepository;
-import com.example.petstoremobile.utils.Resource;
-
-import javax.inject.Inject;
-
-import dagger.hilt.android.lifecycle.HiltViewModel;
-
-@HiltViewModel
-public class UserViewModel extends ViewModel {
-    private final UserRepository userRepository;
-
-    @Inject
-    public UserViewModel(UserRepository userRepository) {
-        this.userRepository = userRepository;
-    }
-
-    public LiveData<Resource<PageResponse<UserDTO>>> getUsers(String role, int page, int size) {
-        return userRepository.getUsers(role, page, size);
-    }
-}

android/app/src/main/res/layout/dialog_full_screen_image.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/black">
+
+    <ImageView
+        android:id="@+id/ivFullScreen"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scaleType="fitCenter" />
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="top|end"
+        android:layout_margin="16dp"
+        android:orientation="horizontal">
+
+        <ImageButton
+            android:id="@+id/btnDownload"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:background="@android:color/transparent"
+            android:src="@android:drawable/stat_sys_download"
+            android:contentDescription="Download"
+            android:tint="@android:color/white" />
+
+        <ImageButton
+            android:id="@+id/btnClose"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:layout_marginLeft="8dp"
+            android:background="@android:color/transparent"
+            android:src="@android:drawable/ic_menu_close_clear_cancel"
+            android:contentDescription="Close"
+            android:tint="@android:color/white" />
+    </LinearLayout>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_adoption_detail.xml

@@ -1,214 +1,228 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:id="@+id/tvAdoptionMode"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Add Adoption"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-        <Button
-            android:id="@+id/btnDeleteAdoption"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_marginStart="8dp"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Delete"
-            android:textColor="@color/white"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/tvAdoptionMode"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Add Adoption"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
+
+            <Button
+                android:id="@+id/btnDeleteAdoption"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="8dp"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Delete"
+                android:textColor="@color/white"/>
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
+                android:padding="24dp">
 
-                <TextView
-                    android:id="@+id/tvAdoptionId"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="ID: #0"
-                    android:textColor="@color/text_light"
-                    android:textSize="11sp"
-                    android:textStyle="italic"
-                    android:layout_gravity="end"
-                    android:layout_marginBottom="8dp"/>
-
-                <!-- Customer -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Customer"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerAdoptionCustomer"
+                <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
 
-                <!-- Pet -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Pet"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <TextView
+                        android:id="@+id/tvAdoptionId"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="ID: #0"
+                        android:textColor="@color/text_light"
+                        android:textSize="11sp"
+                        android:textStyle="italic"
+                        android:layout_gravity="end"
+                        android:layout_marginBottom="8dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerAdoptionPet"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Customer -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Customer"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Employee -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Handled By (Staff)"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerAdoptionCustomer"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerAdoptionEmployee"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Pet -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Pet"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Source Store"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerAdoptionPet"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerAdoptionStore"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Employee -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Handled By (Staff)"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Adoption Date -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Adoption Date"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerAdoptionEmployee"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <EditText
-                    android:id="@+id/etAdoptionDate"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Tap to select date"
-                    android:inputType="none"
-                    android:focusable="false"
-                    android:clickable="true"
-                    android:drawableEnd="@android:drawable/ic_menu_my_calendar"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Source Store"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Adoption Fee -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Adoption Fee"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerAdoptionStore"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <EditText
-                    android:id="@+id/etAdoptionFee"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="0.00"
-                    android:inputType="numberDecimal"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Adoption Date -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Adoption Date"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Status -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Status"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etAdoptionDate"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Tap to select date"
+                        android:inputType="none"
+                        android:focusable="false"
+                        android:clickable="true"
+                        android:drawableEnd="@android:drawable/ic_menu_my_calendar"
+                        android:layout_marginBottom="16dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerAdoptionStatus"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="8dp"/>
+                    <!-- Adoption Fee -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Adoption Fee"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <EditText
+                        android:id="@+id/etAdoptionFee"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="0.00"
+                        android:inputType="numberDecimal"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Status -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Status"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerAdoptionStatus"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="8dp"/>
+
+                </LinearLayout>
 
             </LinearLayout>
 
+        </ScrollView>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnAdoptionBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnSaveAdoption"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="8dp"
+                android:text="Save"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
+
         </LinearLayout>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnAdoptionBack"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
-        <Button
-            android:id="@+id/btnSaveAdoption"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginStart="8dp"
-            android:text="Save"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_analytics.xml

@@ -1,318 +1,332 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <ImageButton
-            android:id="@+id/btnHamburgerAnalytics"
-            android:layout_width="48dp"
-            android:layout_height="48dp"
-            android:src="@drawable/baseline_menu_36"
-            android:background="?attr/selectableItemBackgroundBorderless"
-            android:contentDescription="Open menu"/>
-
-        <TextView
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Analytics"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-        <Button
-            android:id="@+id/btnRefreshAnalytics"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="Refresh"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="16dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
 
-            <!-- Summary Cards Row 1 -->
-            <LinearLayout
-                android:layout_width="match_parent"
+            <ImageButton
+                android:id="@+id/btnHamburgerAnalytics"
+                android:layout_width="48dp"
+                android:layout_height="48dp"
+                android:src="@drawable/baseline_menu_36"
+                android:background="?attr/selectableItemBackgroundBorderless"
+                android:contentDescription="Open menu"/>
+
+            <TextView
+                android:layout_width="0dp"
                 android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_marginBottom="8dp">
+                android:layout_weight="1"
+                android:text="Analytics"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
 
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:layout_marginEnd="4dp"
-                    android:orientation="vertical"
-                    android:background="@drawable/rounded_card"
-                    android:padding="16dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Total Revenue"
-                        android:textColor="@color/text_light"
-                        android:textSize="11sp"/>
-
-                    <TextView
-                        android:id="@+id/tvTotalRevenue"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="$0.00"
-                        android:textColor="@color/accent_coral"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:layout_marginTop="4dp"/>
-
-                </LinearLayout>
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:layout_marginStart="4dp"
-                    android:orientation="vertical"
-                    android:background="@drawable/rounded_card"
-                    android:padding="16dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Transactions"
-                        android:textColor="@color/text_light"
-                        android:textSize="11sp"/>
-
-                    <TextView
-                        android:id="@+id/tvTotalTransactions"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="0"
-                        android:textColor="@color/primary_dark"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:layout_marginTop="4dp"/>
-
-                </LinearLayout>
-
-            </LinearLayout>
-
-            <!-- Summary Cards Row 2 -->
-            <LinearLayout
-                android:layout_width="match_parent"
+            <Button
+                android:id="@+id/btnRefreshAnalytics"
+                android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_marginBottom="16dp">
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:layout_marginEnd="4dp"
-                    android:orientation="vertical"
-                    android:background="@drawable/rounded_card"
-                    android:padding="16dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Avg Transaction"
-                        android:textColor="@color/text_light"
-                        android:textSize="11sp"/>
-
-                    <TextView
-                        android:id="@+id/tvAvgTransaction"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="$0.00"
-                        android:textColor="@color/primary_dark"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:layout_marginTop="4dp"/>
-
-                </LinearLayout>
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:layout_marginStart="4dp"
-                    android:orientation="vertical"
-                    android:background="@drawable/rounded_card"
-                    android:padding="16dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Items Sold"
-                        android:textColor="@color/text_light"
-                        android:textSize="11sp"/>
-
-                    <TextView
-                        android:id="@+id/tvTotalItems"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="0"
-                        android:textColor="@color/primary_dark"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:layout_marginTop="4dp"/>
-
-                </LinearLayout>
-
-            </LinearLayout>
-
-            <!-- Top Products by Revenue -->
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Top Products by Revenue"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="12dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llTopRevenue"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-            </LinearLayout>
-
-            <!-- Top Products by Quantity -->
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Top Products by Quantity"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="12dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llTopQuantity"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-            </LinearLayout>
-
-            <!-- Payment Methods -->
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Payment Methods"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="12dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llPaymentMethods"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-            </LinearLayout>
-
-            <!-- Employee Performance -->
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Employee Performance"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="12dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llEmployeePerformance"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-            </LinearLayout>
-
-            <!-- Daily Revenue -->
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Daily Revenue (Last 7 Days)"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="12dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llDailyRevenue"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-            </LinearLayout>
+                android:text="Refresh"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
 
         </LinearLayout>
 
-    </ScrollView>
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent">
 
-</LinearLayout>
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="16dp">
+
+                <!-- Summary Cards Row 1 -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:layout_marginBottom="8dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:layout_marginEnd="4dp"
+                        android:orientation="vertical"
+                        android:background="@drawable/rounded_card"
+                        android:padding="16dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Total Revenue"
+                            android:textColor="@color/text_light"
+                            android:textSize="11sp"/>
+
+                        <TextView
+                            android:id="@+id/tvTotalRevenue"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="$0.00"
+                            android:textColor="@color/accent_coral"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:layout_marginTop="4dp"/>
+
+                    </LinearLayout>
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:layout_marginStart="4dp"
+                        android:orientation="vertical"
+                        android:background="@drawable/rounded_card"
+                        android:padding="16dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Transactions"
+                            android:textColor="@color/text_light"
+                            android:textSize="11sp"/>
+
+                        <TextView
+                            android:id="@+id/tvTotalTransactions"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="0"
+                            android:textColor="@color/primary_dark"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:layout_marginTop="4dp"/>
+
+                    </LinearLayout>
+
+                </LinearLayout>
+
+                <!-- Summary Cards Row 2 -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:layout_marginBottom="16dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:layout_marginEnd="4dp"
+                        android:orientation="vertical"
+                        android:background="@drawable/rounded_card"
+                        android:padding="16dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Avg Transaction"
+                            android:textColor="@color/text_light"
+                            android:textSize="11sp"/>
+
+                        <TextView
+                            android:id="@+id/tvAvgTransaction"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="$0.00"
+                            android:textColor="@color/primary_dark"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:layout_marginTop="4dp"/>
+
+                    </LinearLayout>
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:layout_marginStart="4dp"
+                        android:orientation="vertical"
+                        android:background="@drawable/rounded_card"
+                        android:padding="16dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Items Sold"
+                            android:textColor="@color/text_light"
+                            android:textSize="11sp"/>
+
+                        <TextView
+                            android:id="@+id/tvTotalItems"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="0"
+                            android:textColor="@color/primary_dark"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:layout_marginTop="4dp"/>
+
+                    </LinearLayout>
+
+                </LinearLayout>
+
+                <!-- Top Products by Revenue -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Top Products by Revenue"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="12dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llTopRevenue"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                </LinearLayout>
+
+                <!-- Top Products by Quantity -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Top Products by Quantity"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="12dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llTopQuantity"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                </LinearLayout>
+
+                <!-- Payment Methods -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Payment Methods"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="12dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llPaymentMethods"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                </LinearLayout>
+
+                <!-- Employee Performance -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Employee Performance"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="12dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llEmployeePerformance"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                </LinearLayout>
+
+                <!-- Daily Revenue -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Daily Revenue (Last 7 Days)"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="12dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llDailyRevenue"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                </LinearLayout>
+
+            </LinearLayout>
+
+        </ScrollView>
+
+    </LinearLayout>
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_appointment_detail.xml

@@ -1,266 +1,282 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:id="@+id/tvApptMode"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Add Appointment"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-        <Button
-            android:id="@+id/btnDeleteAppointment"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_marginStart="8dp"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Delete"
-            android:textColor="@color/white" />
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/tvApptMode"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Add Appointment"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
+
+            <Button
+                android:id="@+id/btnDeleteAppointment"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="8dp"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Delete"
+                android:textColor="@color/white" />
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:id="@+id/tvAppointmentId"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="ID: #0"
-                    android:textColor="@color/text_light"
-                    android:textSize="11sp"
-                    android:textStyle="italic"
-                    android:layout_gravity="end"
-                    android:layout_marginBottom="8dp"/>
-
-
-
-                <!-- Customer -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Customer"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerCustomer"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
-
-                <!-- Store -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Store"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerStore"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
-
-                <!-- Pet -->
-
-                <TextView
-                   android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Pet"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-
-                <Spinner
-                    android:id="@+id/spinnerPet"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
-
-                <!-- Service -->
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Service"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerService"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
-
-                <!-- Staff -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Staff"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerStaff"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
-
-                <!-- Appointment Date -->
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Appointment Date"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <EditText
-                    android:id="@+id/etAppointmentDate"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Tap to select date"
-                    android:inputType="none"
-                    android:focusable="false"
-                    android:clickable="true"
-                    android:drawableEnd="@android:drawable/ic_menu_my_calendar"
-                    android:layout_marginBottom="16dp"/>
-
-                <!-- Appointment Time-->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Appointment Time"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                android:padding="24dp">
 
                 <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:orientation="horizontal"
-                    android:layout_marginBottom="16dp"
-                    android:gravity="center_vertical">
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
 
                     <TextView
+                        android:id="@+id/tvAppointmentId"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:text="Hour:"
-                        android:textColor="@color/text_dark"
-                        android:textSize="13sp"
-                        android:layout_marginEnd="6dp"/>
-
-                    <Spinner
-                        android:id="@+id/spinnerHour"
-                        android:layout_width="0dp"
-                        android:layout_height="wrap_content"
-                        android:layout_weight="1"
-                        android:layout_marginEnd="16dp"/>
+                        android:text="ID: #0"
+                        android:textColor="@color/text_light"
+                        android:textSize="11sp"
+                        android:textStyle="italic"
+                        android:layout_gravity="end"
+                        android:layout_marginBottom="8dp"/>
 
+                    <!-- Customer -->
                     <TextView
+                        android:id="@+id/tvLabelCustomer"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:text="Min:"
+                        android:text="Customer"
                         android:textColor="@color/text_dark"
-                        android:textSize="13sp"
-                        android:layout_marginEnd="6dp"/>
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
                     <Spinner
-                        android:id="@+id/spinnerMinute"
-                        android:layout_width="0dp"
+                        android:id="@+id/spinnerCustomer"
+                        android:layout_width="match_parent"
                         android:layout_height="wrap_content"
-                        android:layout_weight="1"/>
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Pet -->
+                    <TextView
+                        android:id="@+id/tvLabelPet"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Pet"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerPet"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Store -->
+                    <TextView
+                        android:id="@+id/tvLabelStore"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Store"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerStore"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Staff -->
+                    <TextView
+                        android:id="@+id/tvLabelStaff"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Staff"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerStaff"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Service -->
+                    <TextView
+                        android:id="@+id/tvLabelService"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Service"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerService"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Appointment Date -->
+                    <TextView
+                        android:id="@+id/tvLabelDate"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Appointment Date"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <EditText
+                        android:id="@+id/etAppointmentDate"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Tap to select date"
+                        android:inputType="none"
+                        android:focusable="false"
+                        android:clickable="true"
+                        android:drawableEnd="@android:drawable/ic_menu_my_calendar"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Appointment Time-->
+                    <TextView
+                        android:id="@+id/tvLabelTime"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Appointment Time"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <LinearLayout
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="horizontal"
+                        android:layout_marginBottom="16dp"
+                        android:gravity="center_vertical">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Hour:"
+                            android:textColor="@color/text_dark"
+                            android:textSize="13sp"
+                            android:layout_marginEnd="6dp"/>
+
+                        <Spinner
+                            android:id="@+id/spinnerHour"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_weight="1"
+                            android:layout_marginEnd="16dp"/>
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Min:"
+                            android:textColor="@color/text_dark"
+                            android:textSize="13sp"
+                            android:layout_marginEnd="6dp"/>
+
+                        <Spinner
+                            android:id="@+id/spinnerMinute"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_weight="1"/>
+
+                    </LinearLayout>
+
+                    <!-- Status -->
+                    <TextView
+                        android:id="@+id/tvLabelStatus"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Status"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerAppointmentStatus"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="8dp"/>
 
                 </LinearLayout>
 
-                <!-- Status -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Status"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerAppointmentStatus"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="8dp"/>
-
             </LinearLayout>
 
+        </ScrollView>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnApptBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnSaveAppointment"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="8dp"
+                android:text="Save"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
+
         </LinearLayout>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnApptBack"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
-        <Button
-            android:id="@+id/btnSaveAppointment"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginStart="8dp"
-            android:text="Save"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_chat.xml

@@ -1,153 +1,240 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.drawerlayout.widget.DrawerLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/chatDrawerLayout"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <LinearLayout
+    <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:orientation="vertical"
         android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="56dp"
-            android:background="@color/primary_dark"
-            android:gravity="center_vertical"
-            android:paddingStart="16dp"
-            android:paddingEnd="16dp">
+            android:layout_height="match_parent"
+            android:orientation="vertical">
 
-            <ImageButton
-                android:id="@+id/btnHamburger"
-                android:layout_width="48dp"
-                android:layout_height="48dp"
-                android:src="@drawable/baseline_menu_36"
-                android:background="?attr/selectableItemBackgroundBorderless"
-                android:contentDescription="Open menu"/>
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="56dp"
+                android:background="@color/primary_dark"
+                android:gravity="center_vertical"
+                android:paddingStart="16dp"
+                android:paddingEnd="16dp">
 
-            <TextView
-                android:id="@+id/tvChatTitle"
+                <ImageButton
+                    android:id="@+id/btnHamburger"
+                    android:layout_width="48dp"
+                    android:layout_height="48dp"
+                    android:src="@drawable/baseline_menu_36"
+                    android:background="?attr/selectableItemBackgroundBorderless"
+                    android:contentDescription="Open menu"/>
+
+                <TextView
+                    android:id="@+id/tvChatTitle"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:text="Customer Chat"
+                    android:textColor="@color/white"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    android:paddingStart="8dp"
+                    android:paddingEnd="8dp"/>
+
+            </LinearLayout>
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/rvMessages"
+                android:layout_width="match_parent"
+                android:layout_height="0dp"
+                android:layout_weight="1"
+                android:padding="8dp"
+                android:clipToPadding="false" />
+
+            <LinearLayout
+                android:id="@+id/layoutAttachmentPreview"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                android:text="Customer Chat"
-                android:textColor="@color/white"
-                android:textSize="20sp"
-                android:textStyle="bold"
-                android:paddingStart="8dp"
-                android:paddingEnd="8dp"/>
+                android:orientation="horizontal"
+                android:padding="8dp"
+                android:background="#E0E0E0"
+                android:gravity="center_vertical"
+                android:visibility="gone">
+
+                <ImageView
+                    android:id="@+id/ivPreview"
+                    android:layout_width="48dp"
+                    android:layout_height="48dp"
+                    android:scaleType="centerCrop"
+                    android:layout_marginEnd="8dp"
+                    android:visibility="gone"/>
+
+                <TextView
+                    android:id="@+id/tvPreviewName"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:ellipsize="middle"
+                    android:singleLine="true"
+                    android:textColor="@color/text_dark"/>
+
+                <ImageButton
+                    android:id="@+id/btnRemoveAttachment"
+                    android:layout_width="40dp"
+                    android:layout_height="40dp"
+                    android:src="@android:drawable/ic_menu_close_clear_cancel"
+                    android:background="?attr/selectableItemBackgroundBorderless"
+                    android:contentDescription="Remove attachment"/>
+
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:padding="8dp"
+                android:gravity="center_vertical"
+                android:background="@color/white">
+
+                <ImageButton
+                    android:id="@+id/btnAttach"
+                    android:layout_width="48dp"
+                    android:layout_height="48dp"
+                    android:src="@android:drawable/ic_menu_add"
+                    android:background="?attr/selectableItemBackgroundBorderless"
+                    android:contentDescription="Attach file"
+                    android:layout_marginEnd="4dp"/>
+
+                <EditText
+                    android:id="@+id/etMessage"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:hint="Type a message..."
+                    android:inputType="text"
+                    android:imeOptions="actionSend"
+                    android:layout_marginEnd="8dp"
+                    android:textColor="@color/text_dark"/>
+
+                <Button
+                    android:id="@+id/btnSend"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Send"
+                    android:backgroundTint="@color/accent_coral"
+                    android:textColor="@color/white"/>
+
+            </LinearLayout>
 
         </LinearLayout>
 
-        <androidx.recyclerview.widget.RecyclerView
-            android:id="@+id/rvMessages"
-            android:layout_width="match_parent"
-            android:layout_height="0dp"
-            android:layout_weight="1"
-            android:padding="8dp"
-            android:clipToPadding="false" />
-
-        <LinearLayout
-            android:id="@+id/layoutAttachmentPreview"
-            android:layout_width="match_parent"
+        <ProgressBar
+            android:id="@+id/progressBar"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:orientation="horizontal"
-            android:padding="8dp"
-            android:background="#E0E0E0"
-            android:gravity="center_vertical"
-            android:visibility="gone">
+            android:layout_centerInParent="true"
+            android:visibility="gone"
+            android:indeterminateTint="@color/accent_coral"/>
 
-            <ImageView
-                android:id="@+id/ivPreview"
-                android:layout_width="48dp"
-                android:layout_height="48dp"
-                android:scaleType="centerCrop"
-                android:layout_marginEnd="8dp"
-                android:visibility="gone"/>
+    </RelativeLayout>
 
-            <TextView
-                android:id="@+id/tvPreviewName"
-                android:layout_width="0dp"
-                android:layout_height="wrap_content"
-                android:layout_weight="1"
-                android:ellipsize="middle"
-                android:singleLine="true"
-                android:textColor="@color/text_dark"/>
-
-            <ImageButton
-                android:id="@+id/btnRemoveAttachment"
-                android:layout_width="40dp"
-                android:layout_height="40dp"
-                android:src="@android:drawable/ic_menu_close_clear_cancel"
-                android:background="?attr/selectableItemBackgroundBorderless"
-                android:contentDescription="Remove attachment"/>
-
-        </LinearLayout>
-
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="horizontal"
-            android:padding="8dp"
-            android:gravity="center_vertical"
-            android:background="@color/white">
-
-            <ImageButton
-                android:id="@+id/btnAttach"
-                android:layout_width="48dp"
-                android:layout_height="48dp"
-                android:src="@android:drawable/ic_menu_add"
-                android:background="?attr/selectableItemBackgroundBorderless"
-                android:contentDescription="Attach file"
-                android:layout_marginEnd="4dp"/>
-
-            <EditText
-                android:id="@+id/etMessage"
-                android:layout_width="0dp"
-                android:layout_height="wrap_content"
-                android:layout_weight="1"
-                android:hint="Type a message..."
-                android:inputType="text"
-                android:imeOptions="actionSend"
-                android:layout_marginEnd="8dp"
-                android:textColor="@color/text_dark"/>
-
-            <Button
-                android:id="@+id/btnSend"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="Send"
-                android:backgroundTint="@color/accent_coral"
-                android:textColor="@color/white"/>
-
-        </LinearLayout>
-
-    </LinearLayout>
-
-    <LinearLayout
+    <androidx.core.widget.NestedScrollView
         android:id="@+id/chatListDrawer"
         android:layout_width="260dp"
         android:layout_height="match_parent"
         android:layout_gravity="start"
-        android:orientation="vertical"
-        android:background="@color/primary_dark"
-        android:padding="16dp">
+        android:background="@color/primary_dark">
 
-        <TextView
+        <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:text="Active Chats"
-            android:textColor="@color/white"
-            android:textSize="18sp"
-            android:textStyle="bold"
-            android:layout_marginBottom="16dp"/>
+            android:orientation="vertical"
+            android:paddingTop="24dp">
 
-        <androidx.recyclerview.widget.RecyclerView
-            android:id="@+id/rvChatList"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"/>
+            <LinearLayout
+                android:id="@+id/headerActiveChats"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical"
+                android:clickable="true"
+                android:focusable="true"
+                android:background="?attr/selectableItemBackground"
+                android:paddingStart="16dp"
+                android:paddingEnd="16dp"
+                android:paddingBottom="8dp">
 
-    </LinearLayout>
+                <TextView
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:text="ACTIVE CHATS"
+                    android:textColor="@color/text_light"
+                    android:textSize="11sp"
+                    android:letterSpacing="0.15"
+                    android:textStyle="bold"/>
+
+                <ImageView
+                    android:id="@+id/ivActiveChevron"
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@android:drawable/arrow_up_float"
+                    app:tint="@color/text_light"/>
+            </LinearLayout>
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/rvActiveChats"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:nestedScrollingEnabled="false"
+                android:layout_marginBottom="16dp"
+                android:paddingStart="8dp"
+                android:paddingEnd="8dp"/>
+
+            <LinearLayout
+                android:id="@+id/headerClosedChats"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical"
+                android:clickable="true"
+                android:focusable="true"
+                android:background="?attr/selectableItemBackground"
+                android:paddingStart="16dp"
+                android:paddingEnd="16dp"
+                android:paddingTop="8dp"
+                android:paddingBottom="8dp">
+
+                <TextView
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:text="CLOSED CHATS"
+                    android:textColor="@color/text_light"
+                    android:textSize="11sp"
+                    android:letterSpacing="0.15"
+                    android:textStyle="bold"/>
+
+                <ImageView
+                    android:id="@+id/ivClosedChevron"
+                    android:layout_width="20dp"
+                    android:layout_height="20dp"
+                    android:src="@android:drawable/arrow_down_float"
+                    app:tint="@color/text_light"/>
+            </LinearLayout>
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/rvClosedChats"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:nestedScrollingEnabled="false"
+                android:visibility="gone"
+                android:paddingStart="8dp"
+                android:paddingEnd="8dp"/>
+
+        </LinearLayout>
+    </androidx.core.widget.NestedScrollView>
 
 </androidx.drawerlayout.widget.DrawerLayout>

android/app/src/main/res/layout/fragment_inventory_detail.xml

@@ -1,155 +1,169 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
-    <!-- Header -->
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:id="@+id/tvInventoryMode"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Add Inventory"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-        <Button
-            android:id="@+id/btnDeleteInventory"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Delete"
-            android:textColor="@color/white"
-            android:visibility="gone"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
+        <!-- Header -->
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/tvInventoryMode"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Add Inventory"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
+
+            <Button
+                android:id="@+id/btnDeleteInventory"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Delete"
+                android:textColor="@color/white"
+                android:visibility="gone"/>
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp">
+                android:padding="24dp">
 
-                <!-- Inventory ID — edit mode only -->
-                <TextView
-                    android:id="@+id/tvInventoryId"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Inventory ID: —"
-                    android:textColor="@color/text_light"
-                    android:textSize="11sp"
-                    android:textStyle="italic"
-                    android:layout_gravity="end"
-                    android:layout_marginBottom="12dp"
-                    android:visibility="gone"/>
-
-                <!-- Store selection label -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Store"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <!-- Store Spinner -->
-                <Spinner
-                    android:id="@+id/spinnerInventoryStore"
+                <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp">
 
-                <!-- Product selection label -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Product"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <!-- Inventory ID — edit mode only -->
+                    <TextView
+                        android:id="@+id/tvInventoryId"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Inventory ID: —"
+                        android:textColor="@color/text_light"
+                        android:textSize="11sp"
+                        android:textStyle="italic"
+                        android:layout_gravity="end"
+                        android:layout_marginBottom="12dp"
+                        android:visibility="gone"/>
 
-                <!-- Product Spinner -->
-                <Spinner
-                    android:id="@+id/spinnerInventoryProduct"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Store selection label -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Store"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Quantity label -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Quantity"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <!-- Store Spinner -->
+                    <Spinner
+                        android:id="@+id/spinnerInventoryStore"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <!-- Quantity input -->
-                <EditText
-                    android:id="@+id/etQuantity"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Enter quantity"
-                    android:inputType="number"/>
+                    <!-- Product selection label -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Product"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <!-- Product Spinner -->
+                    <Spinner
+                        android:id="@+id/spinnerInventoryProduct"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Quantity label -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Quantity"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <!-- Quantity input -->
+                    <EditText
+                        android:id="@+id/etQuantity"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter quantity"
+                        android:inputType="number"/>
+
+                </LinearLayout>
 
             </LinearLayout>
 
+        </ScrollView>
+
+        <!-- Bottom buttons -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnInventoryBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnSaveInventory"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="8dp"
+                android:text="Save"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
+
         </LinearLayout>
 
-    </ScrollView>
-
-    <!-- Bottom buttons -->
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnInventoryBack"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
-        <Button
-            android:id="@+id/btnSaveInventory"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginStart="8dp"
-            android:text="Save"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_pet_detail.xml

@@ -1,229 +1,244 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:id="@+id/tvMode"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Add Pet"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold" />
-
-        <Button
-            android:id="@+id/btnDeletePet"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_marginStart="8dp"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Delete"
-            android:textColor="@color/white" />
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/tvMode"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Add Pet"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold" />
+
+            <Button
+                android:id="@+id/btnDeletePet"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="8dp"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Delete"
+                android:textColor="@color/white" />
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
+                android:padding="24dp">
 
-                <TextView
-                    android:id="@+id/tvPetId"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Pet ID: #0"
-                    android:textColor="@color/text_light"
-                    android:textSize="11sp"
-                    android:textStyle="italic"
-                    android:layout_gravity="end"
-                    android:layout_marginBottom="8dp"/>
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Pet Name"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <EditText
-                    android:id="@+id/etPetName"
+                <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:hint="Enter pet name"
-                    android:inputType="text"
-                    android:layout_marginBottom="16dp"
-                    android:textColor="@color/text_dark"/>
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Species"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <TextView
+                        android:id="@+id/tvPetId"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Pet ID: #0"
+                        android:textColor="@color/text_light"
+                        android:textSize="11sp"
+                        android:textStyle="italic"
+                        android:layout_gravity="end"
+                        android:layout_marginBottom="8dp"/>
 
-                <EditText
-                    android:id="@+id/etPetSpecies"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="e.g. Dog, Cat, Bird"
-                    android:inputType="text"
-                    android:layout_marginBottom="16dp"
-                    android:textColor="@color/text_dark"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Pet Name"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Breed"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etPetName"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter pet name"
+                        android:inputType="text"
+                        android:layout_marginBottom="16dp"
+                        android:textColor="@color/text_dark"/>
 
-                <EditText
-                    android:id="@+id/etPetBreed"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Enter breed"
-                    android:inputType="text"
-                    android:layout_marginBottom="16dp"
-                    android:textColor="@color/text_dark"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Species"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Age"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etPetSpecies"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="e.g. Dog, Cat, Bird"
+                        android:inputType="text"
+                        android:layout_marginBottom="16dp"
+                        android:textColor="@color/text_dark"/>
 
-                <EditText
-                    android:id="@+id/etPetAge"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Enter age"
-                    android:inputType="number"
-                    android:layout_marginBottom="16dp"
-                    android:textColor="@color/text_dark"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Breed"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Price"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etPetBreed"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter breed"
+                        android:inputType="text"
+                        android:layout_marginBottom="16dp"
+                        android:textColor="@color/text_dark"/>
 
-                <EditText
-                    android:id="@+id/etPetPrice"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Enter price"
-                    android:inputType="numberDecimal"
-                    android:layout_marginBottom="16dp"
-                    android:textColor="@color/text_dark"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Age"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Status"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etPetAge"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter age"
+                        android:inputType="number"
+                        android:layout_marginBottom="16dp"
+                        android:textColor="@color/text_dark"/>
 
-                <Spinner
-                    android:id="@+id/spinnerPetStatus"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Price"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Owner"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etPetPrice"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter price"
+                        android:inputType="numberDecimal"
+                        android:layout_marginBottom="16dp"
+                        android:textColor="@color/text_dark"/>
 
-                <Spinner
-                    android:id="@+id/spinnerCustomer"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Status"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Store"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerPetStatus"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerStore"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Owner"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerCustomer"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Store"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerStore"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"/>
+
+                </LinearLayout>
 
             </LinearLayout>
 
+        </ScrollView>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnSavePet"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="8dp"
+                android:layout_weight="1"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Save"
+                android:textColor="@color/white" />
+
         </LinearLayout>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnBack"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
-        <Button
-            android:id="@+id/btnSavePet"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_marginStart="8dp"
-            android:layout_weight="1"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Save"
-            android:textColor="@color/white" />
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_pet_profile.xml

@@ -1,306 +1,320 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1"
+        android:layout_height="match_parent"
         android:orientation="vertical"
-        android:background="@color/primary_dark">
-
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="56dp"
-            android:orientation="horizontal"
-            android:gravity="center_vertical"
-            android:paddingStart="16dp"
-            android:paddingEnd="16dp">
-
-            <TextView
-                android:layout_width="0dp"
-                android:layout_height="wrap_content"
-                android:layout_weight="1"
-                android:text="Pet Profile"
-                android:textColor="@color/white"
-                android:textSize="20sp"
-                android:textStyle="bold"/>
-
-            <Button
-                android:id="@+id/btnEditPet"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="Edit"
-                android:backgroundTint="@color/accent_coral"
-                android:textColor="@color/white"/>
-
-        </LinearLayout>
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
             android:orientation="vertical"
-            android:gravity="center">
+            android:background="@color/primary_dark">
 
-            <ImageView
-                android:id="@+id/imgPet"
-                android:layout_width="146dp"
-                android:layout_height="140dp"
-                android:layout_marginBottom="12dp"
-                android:background="@drawable/circle_image"
-                android:clipToOutline="true"
-                android:scaleType="centerCrop"
-                android:src="@drawable/placeholder" />
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="56dp"
+                android:orientation="horizontal"
+                android:gravity="center_vertical"
+                android:paddingStart="16dp"
+                android:paddingEnd="16dp">
 
-            <Button
-                android:id="@+id/btnChangePhoto"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="Change Photo"
-                style="@style/Widget.Material3.Button.TextButton"
-                android:textColor="@color/text_light"
-                android:layout_marginBottom="8dp"/>
+                <TextView
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:text="Pet Profile"
+                    android:textColor="@color/white"
+                    android:textSize="20sp"
+                    android:textStyle="bold"/>
 
-            <TextView
-                android:id="@+id/tvPetName"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="NAME"
-                android:textColor="@color/white"
-                android:textSize="26sp"
-                android:textStyle="bold"/>
+                <Button
+                    android:id="@+id/btnEditPet"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Edit"
+                    android:backgroundTint="@color/accent_coral"
+                    android:textColor="@color/white"/>
+
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="0dp"
+                android:layout_weight="1"
+                android:orientation="vertical"
+                android:gravity="center">
+
+                <ImageView
+                    android:id="@+id/imgPet"
+                    android:layout_width="146dp"
+                    android:layout_height="140dp"
+                    android:layout_marginBottom="12dp"
+                    android:background="@drawable/circle_image"
+                    android:clipToOutline="true"
+                    android:scaleType="centerCrop"
+                    android:src="@drawable/placeholder" />
+
+                <Button
+                    android:id="@+id/btnChangePhoto"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Change Photo"
+                    style="@style/Widget.Material3.Button.TextButton"
+                    android:textColor="@color/text_light"
+                    android:layout_marginBottom="8dp"/>
+
+                <TextView
+                    android:id="@+id/tvPetName"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="NAME"
+                    android:textColor="@color/white"
+                    android:textSize="26sp"
+                    android:textStyle="bold"/>
+
+            </LinearLayout>
 
         </LinearLayout>
 
-    </LinearLayout>
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="16dp">
+
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="120dp"
+                    android:orientation="horizontal"
+                    android:layout_marginBottom="8dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="match_parent"
+                        android:layout_weight="1"
+                        android:orientation="vertical"
+                        android:gravity="center"
+                        android:background="@color/white"
+                        android:layout_marginEnd="8dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="SPECIES"
+                            android:textSize="11sp"
+                            android:textColor="#888888"
+                            android:textAllCaps="true"
+                            android:layout_marginBottom="4dp"/>
+
+                        <TextView
+                            android:id="@+id/tvPetSpecies"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Dog"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:textColor="@color/text_dark"/>
+
+                    </LinearLayout>
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="match_parent"
+                        android:layout_weight="1"
+                        android:orientation="vertical"
+                        android:gravity="center"
+                        android:background="@color/white"
+                        android:layout_marginStart="8dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="BREED"
+                            android:textSize="11sp"
+                            android:textColor="#888888"
+                            android:textAllCaps="true"
+                            android:layout_marginBottom="4dp"/>
+
+                        <TextView
+                            android:id="@+id/tvPetBreed"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Labrador"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:textColor="@color/text_dark"/>
+
+                    </LinearLayout>
+
+                </LinearLayout>
+
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="120dp"
+                    android:orientation="horizontal"
+                    android:layout_marginTop="8dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="match_parent"
+                        android:layout_weight="1"
+                        android:orientation="vertical"
+                        android:gravity="center"
+                        android:background="@color/white"
+                        android:layout_marginEnd="8dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="AGE"
+                            android:textSize="11sp"
+                            android:textColor="#888888"
+                            android:textAllCaps="true"
+                            android:layout_marginBottom="4dp"/>
+
+                        <TextView
+                            android:id="@+id/tvPetAge"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="2 yr(s)"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:textColor="@color/text_dark"/>
+
+                    </LinearLayout>
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="match_parent"
+                        android:layout_weight="1"
+                        android:orientation="vertical"
+                        android:gravity="center"
+                        android:background="@color/white"
+                        android:layout_marginStart="8dp">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="PRICE"
+                            android:textSize="11sp"
+                            android:textColor="#888888"
+                            android:textAllCaps="true"
+                            android:layout_marginBottom="4dp"/>
+
+                        <TextView
+                            android:id="@+id/tvPetPrice"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="$500.00"
+                            android:textSize="20sp"
+                            android:textStyle="bold"
+                            android:textColor="@color/accent_coral"/>
+
+                    </LinearLayout>
+
+                </LinearLayout>
+
+                <LinearLayout
+                    android:id="@+id/layoutPetOwner"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:gravity="center"
+                    android:background="@color/white"
+                    android:layout_marginTop="16dp"
+                    android:padding="16dp"
+                    android:visibility="gone">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="OWNER"
+                        android:textSize="11sp"
+                        android:textColor="#888888"
+                        android:textAllCaps="true"
+                        android:layout_marginBottom="4dp"/>
+
+                    <TextView
+                        android:id="@+id/tvPetOwner"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="No Owner"
+                        android:textSize="20sp"
+                        android:textStyle="bold"
+                        android:textColor="@color/text_dark"/>
+
+                </LinearLayout>
+
+                <LinearLayout
+                    android:id="@+id/layoutPetStore"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:gravity="center"
+                    android:background="@color/white"
+                    android:layout_marginTop="16dp"
+                    android:padding="16dp"
+                    android:visibility="gone">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="STORE"
+                        android:textSize="11sp"
+                        android:textColor="#888888"
+                        android:textAllCaps="true"
+                        android:layout_marginBottom="4dp"/>
+
+                    <TextView
+                        android:id="@+id/tvPetStore"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="No Store"
+                        android:textSize="20sp"
+                        android:textStyle="bold"
+                        android:textColor="@color/text_dark"/>
+
+                </LinearLayout>
+
+            </LinearLayout>
+
+        </ScrollView>
 
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:orientation="vertical"
+            android:orientation="horizontal"
             android:padding="16dp">
 
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="120dp"
-                android:orientation="horizontal"
-                android:layout_marginBottom="8dp">
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="match_parent"
-                    android:layout_weight="1"
-                    android:orientation="vertical"
-                    android:gravity="center"
-                    android:background="@color/white"
-                    android:layout_marginEnd="8dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="SPECIES"
-                        android:textSize="11sp"
-                        android:textColor="#888888"
-                        android:textAllCaps="true"
-                        android:layout_marginBottom="4dp"/>
-
-                    <TextView
-                        android:id="@+id/tvPetSpecies"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Dog"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:textColor="@color/text_dark"/>
-
-                </LinearLayout>
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="match_parent"
-                    android:layout_weight="1"
-                    android:orientation="vertical"
-                    android:gravity="center"
-                    android:background="@color/white"
-                    android:layout_marginStart="8dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="BREED"
-                        android:textSize="11sp"
-                        android:textColor="#888888"
-                        android:textAllCaps="true"
-                        android:layout_marginBottom="4dp"/>
-
-                    <TextView
-                        android:id="@+id/tvPetBreed"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Labrador"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:textColor="@color/text_dark"/>
-
-                </LinearLayout>
-
-            </LinearLayout>
-
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="120dp"
-                android:orientation="horizontal"
-                android:layout_marginTop="8dp">
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="match_parent"
-                    android:layout_weight="1"
-                    android:orientation="vertical"
-                    android:gravity="center"
-                    android:background="@color/white"
-                    android:layout_marginEnd="8dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="AGE"
-                        android:textSize="11sp"
-                        android:textColor="#888888"
-                        android:textAllCaps="true"
-                        android:layout_marginBottom="4dp"/>
-
-                    <TextView
-                        android:id="@+id/tvPetAge"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="2 yr(s)"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:textColor="@color/text_dark"/>
-
-                </LinearLayout>
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="match_parent"
-                    android:layout_weight="1"
-                    android:orientation="vertical"
-                    android:gravity="center"
-                    android:background="@color/white"
-                    android:layout_marginStart="8dp">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="PRICE"
-                        android:textSize="11sp"
-                        android:textColor="#888888"
-                        android:textAllCaps="true"
-                        android:layout_marginBottom="4dp"/>
-
-                    <TextView
-                        android:id="@+id/tvPetPrice"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="$500.00"
-                        android:textSize="20sp"
-                        android:textStyle="bold"
-                        android:textColor="@color/accent_coral"/>
-
-                </LinearLayout>
-
-            </LinearLayout>
-
-            <LinearLayout
-                android:id="@+id/layoutPetOwner"
+            <Button
+                android:id="@+id/btnBack"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:gravity="center"
-                android:background="@color/white"
-                android:layout_marginTop="16dp"
-                android:padding="16dp"
-                android:visibility="gone">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="OWNER"
-                    android:textSize="11sp"
-                    android:textColor="#888888"
-                    android:textAllCaps="true"
-                    android:layout_marginBottom="4dp"/>
-
-                <TextView
-                    android:id="@+id/tvPetOwner"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="No Owner"
-                    android:textSize="20sp"
-                    android:textStyle="bold"
-                    android:textColor="@color/text_dark"/>
-
-            </LinearLayout>
-
-            <LinearLayout
-                android:id="@+id/layoutPetStore"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:gravity="center"
-                android:background="@color/white"
-                android:layout_marginTop="16dp"
-                android:padding="16dp"
-                android:visibility="gone">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="STORE"
-                    android:textSize="11sp"
-                    android:textColor="#888888"
-                    android:textAllCaps="true"
-                    android:layout_marginBottom="4dp"/>
-
-                <TextView
-                    android:id="@+id/tvPetStore"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="No Store"
-                    android:textSize="20sp"
-                    android:textStyle="bold"
-                    android:textColor="@color/text_dark"/>
-
-            </LinearLayout>
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
 
         </LinearLayout>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnBack"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_product_detail.xml

@@ -1,195 +1,209 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:id="@+id/tvProductMode"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Add Product"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-        <Button
-            android:id="@+id/btnDeleteProduct"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Delete"
-            android:textColor="@color/white"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/tvProductMode"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Add Product"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
+
+            <Button
+                android:id="@+id/btnDeleteProduct"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Delete"
+                android:textColor="@color/white"/>
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
+                android:padding="24dp">
 
-                <TextView
-                    android:id="@+id/tvProductId"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="ID: #0"
-                    android:textColor="@color/text_light"
-                    android:textSize="11sp"
-                    android:textStyle="italic"
-                    android:layout_gravity="end"
-                    android:layout_marginBottom="8dp"/>
-
-                <!-- Product Image -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Product Image"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <FrameLayout
+                <LinearLayout
                     android:layout_width="match_parent"
-                    android:layout_height="200dp"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
                     android:layout_marginBottom="16dp">
 
-                    <ImageView
-                        android:id="@+id/ivProductImage"
+                    <TextView
+                        android:id="@+id/tvProductId"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="ID: #0"
+                        android:textColor="@color/text_light"
+                        android:textSize="11sp"
+                        android:textStyle="italic"
+                        android:layout_gravity="end"
+                        android:layout_marginBottom="8dp"/>
+
+                    <!-- Product Image -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Product Image"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <FrameLayout
                         android:layout_width="match_parent"
-                        android:layout_height="match_parent"
-                        android:scaleType="centerCrop"
-                        android:src="@drawable/placeholder2"
-                        android:background="@color/text_light"
-                        android:clickable="true"
-                        android:focusable="true"/>
+                        android:layout_height="200dp"
+                        android:layout_marginBottom="16dp">
 
-                </FrameLayout>
+                        <ImageView
+                            android:id="@+id/ivProductImage"
+                            android:layout_width="match_parent"
+                            android:layout_height="match_parent"
+                            android:scaleType="centerCrop"
+                            android:src="@drawable/placeholder2"
+                            android:background="@color/text_light"
+                            android:clickable="true"
+                            android:focusable="true"/>
 
-                <!-- Product Name -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Product Name"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    </FrameLayout>
 
-                <EditText
-                    android:id="@+id/etProductName"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Enter product name"
-                    android:inputType="text"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Product Name -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Product Name"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Category -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Category"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etProductName"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter product name"
+                        android:inputType="text"
+                        android:layout_marginBottom="16dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerProductCategory"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Category -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Category"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Description -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Description"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerProductCategory"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <EditText
-                    android:id="@+id/etProductDesc"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="Enter description"
-                    android:inputType="textMultiLine"
-                    android:minLines="2"
-                    android:layout_marginBottom="16dp"/>
+                    <!-- Description -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Description"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <!-- Price -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Price"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <EditText
+                        android:id="@+id/etProductDesc"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="Enter description"
+                        android:inputType="textMultiLine"
+                        android:minLines="2"
+                        android:layout_marginBottom="16dp"/>
 
-                <EditText
-                    android:id="@+id/etProductPrice"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="0.00"
-                    android:inputType="numberDecimal"
-                    android:layout_marginBottom="8dp"/>
+                    <!-- Price -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Price"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <EditText
+                        android:id="@+id/etProductPrice"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="0.00"
+                        android:inputType="numberDecimal"
+                        android:layout_marginBottom="8dp"/>
+
+                </LinearLayout>
 
             </LinearLayout>
 
+        </ScrollView>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnProductBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnSaveProduct"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="8dp"
+                android:text="Save"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
+
         </LinearLayout>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnProductBack"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
-        <Button
-            android:id="@+id/btnSaveProduct"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginStart="8dp"
-            android:text="Save"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_product_supplier_detail.xml

@@ -1,138 +1,152 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:id="@+id/tvPSMode"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Add Product Supplier"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-        <Button
-            android:id="@+id/btnDeletePS"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:backgroundTint="@color/accent_coral"
-            android:text="Delete"
-            android:textColor="@color/white"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/tvPSMode"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Add Product Supplier"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
+
+            <Button
+                android:id="@+id/btnDeletePS"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:backgroundTint="@color/accent_coral"
+                android:text="Delete"
+                android:textColor="@color/white"/>
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
+                android:padding="24dp">
 
-                <!-- Product -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Product"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerPSProduct"
+                <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
 
-                <!-- Supplier -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Supplier"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <!-- Product -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Product"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <Spinner
-                    android:id="@+id/spinnerPSSupplier"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginBottom="16dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerPSProduct"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
 
-                <!-- Cost -->
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Cost"
-                    android:textColor="@color/text_dark"
-                    android:textSize="12sp"
-                    android:layout_marginBottom="4dp"/>
+                    <!-- Supplier -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Supplier"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
 
-                <EditText
-                    android:id="@+id/etPSCost"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:hint="0.00"
-                    android:inputType="numberDecimal"
-                    android:layout_marginBottom="8dp"/>
+                    <Spinner
+                        android:id="@+id/spinnerPSSupplier"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
+                    <!-- Cost -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Cost"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <EditText
+                        android:id="@+id/etPSCost"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:hint="0.00"
+                        android:inputType="numberDecimal"
+                        android:layout_marginBottom="8dp"/>
+
+                </LinearLayout>
 
             </LinearLayout>
 
+        </ScrollView>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnPSBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnSavePS"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="8dp"
+                android:text="Save"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
+
         </LinearLayout>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnPSBack"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
-
-        <Button
-            android:id="@+id/btnSavePS"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginStart="8dp"
-            android:text="Save"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_profile.xml

@@ -1,200 +1,214 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
-    <LinearLayout
+    <ScrollView
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical">
+        android:layout_height="match_parent"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:background="@color/primary_dark"
-            android:gravity="center_horizontal"
-            android:paddingTop="32dp"
-            android:paddingBottom="32dp">
+            android:orientation="vertical">
 
-            <ImageView
-                android:id="@+id/imgProfile"
-                android:layout_width="171dp"
-                android:layout_height="166dp"
-                android:layout_marginBottom="8dp"
-                android:background="@drawable/circle_image"
-                android:clipToOutline="true"
-                android:scaleType="centerCrop"
-                android:src="@drawable/placeholder" />
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:background="@color/primary_dark"
+                android:gravity="center_horizontal"
+                android:paddingTop="32dp"
+                android:paddingBottom="32dp">
+
+                <ImageView
+                    android:id="@+id/imgProfile"
+                    android:layout_width="171dp"
+                    android:layout_height="166dp"
+                    android:layout_marginBottom="8dp"
+                    android:background="@drawable/circle_image"
+                    android:clipToOutline="true"
+                    android:scaleType="centerCrop"
+                    android:src="@drawable/placeholder" />
+
+                <Button
+                    android:id="@+id/btnChangePhoto"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="Change Photo"
+                    style="@style/Widget.Material3.Button.TextButton"
+                    android:textColor="@color/text_light"/>
+
+                <TextView
+                    android:id="@+id/tvProfileName"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="8dp"
+                    android:text="First Last"
+                    android:textColor="@color/white"
+                    android:textSize="22sp"
+                    android:textStyle="bold" />
+
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:background="@color/white"
+                android:layout_marginStart="16dp"
+                android:layout_marginEnd="16dp"
+                android:layout_marginTop="16dp"
+                android:layout_marginBottom="16dp"
+                android:padding="16dp">
+
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:gravity="center_vertical"
+                    android:paddingBottom="12dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:orientation="vertical">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Email"
+                            android:textSize="12sp"
+                            android:textColor="#888888"/>
+
+                        <TextView
+                            android:id="@+id/tvProfileEmail"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="No email loaded"
+                            android:textColor="@color/text_dark"
+                            android:textSize="16sp" />
+
+                    </LinearLayout>
+
+                    <Button
+                        android:id="@+id/btnEditEmail"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Edit"
+                        android:textColor="@color/accent_coral"
+                        style="@style/Widget.Material3.Button.TextButton"/>
+
+                </LinearLayout>
+
+                <View
+                    android:layout_width="match_parent"
+                    android:layout_height="1dp"
+                    android:background="#F0F0F0"/>
+
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:gravity="center_vertical"
+                    android:paddingTop="12dp"
+                    android:paddingBottom="12dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:orientation="vertical">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Phone"
+                            android:textSize="12sp"
+                            android:textColor="#888888"/>
+
+                        <TextView
+                            android:id="@+id/tvProfilePhone"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="No phone loaded"
+                            android:textColor="@color/text_dark"
+                            android:textSize="16sp" />
+
+                    </LinearLayout>
+
+                    <Button
+                        android:id="@+id/btnEditPhone"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Edit"
+                        android:textColor="@color/accent_coral"
+                        style="@style/Widget.Material3.Button.TextButton"/>
+
+                </LinearLayout>
+
+                <View
+                    android:layout_width="match_parent"
+                    android:layout_height="1dp"
+                    android:background="#F0F0F0"/>
+
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:gravity="center_vertical"
+                    android:paddingTop="12dp">
+
+                    <LinearLayout
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:orientation="vertical">
+
+                        <TextView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Role"
+                            android:textSize="12sp"
+                            android:textColor="#888888"/>
+
+                        <TextView
+                            android:id="@+id/tvProfileRole"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="No role loaded"
+                            android:textSize="16sp"
+                            android:textColor="@color/accent_coral"/>
+
+                    </LinearLayout>
+
+                </LinearLayout>
+
+            </LinearLayout>
 
             <Button
-                android:id="@+id/btnChangePhoto"
-                android:layout_width="wrap_content"
+                android:id="@+id/btnLogout"
+                android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                android:text="Change Photo"
-                style="@style/Widget.Material3.Button.TextButton"
-                android:textColor="@color/text_light"/>
-
-            <TextView
-                android:id="@+id/tvProfileName"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="8dp"
-                android:text="First Last"
-                android:textColor="@color/white"
-                android:textSize="22sp"
-                android:textStyle="bold" />
+                android:layout_marginStart="16dp"
+                android:layout_marginEnd="16dp"
+                android:layout_marginBottom="24dp"
+                android:text="Log Out"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"/>
 
         </LinearLayout>
 
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:background="@color/white"
-            android:layout_marginStart="16dp"
-            android:layout_marginEnd="16dp"
-            android:layout_marginTop="16dp"
-            android:layout_marginBottom="16dp"
-            android:padding="16dp">
+    </ScrollView>
 
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:gravity="center_vertical"
-                android:paddingBottom="12dp">
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
 
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:orientation="vertical">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Email"
-                        android:textSize="12sp"
-                        android:textColor="#888888"/>
-
-                    <TextView
-                        android:id="@+id/tvProfileEmail"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="No email loaded"
-                        android:textColor="@color/text_dark"
-                        android:textSize="16sp" />
-
-                </LinearLayout>
-
-                <Button
-                    android:id="@+id/btnEditEmail"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Edit"
-                    android:textColor="@color/accent_coral"
-                    style="@style/Widget.Material3.Button.TextButton"/>
-
-            </LinearLayout>
-
-            <View
-                android:layout_width="match_parent"
-                android:layout_height="1dp"
-                android:background="#F0F0F0"/>
-
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:gravity="center_vertical"
-                android:paddingTop="12dp"
-                android:paddingBottom="12dp">
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:orientation="vertical">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Phone"
-                        android:textSize="12sp"
-                        android:textColor="#888888"/>
-
-                    <TextView
-                        android:id="@+id/tvProfilePhone"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="No phone loaded"
-                        android:textColor="@color/text_dark"
-                        android:textSize="16sp" />
-
-                </LinearLayout>
-
-                <Button
-                    android:id="@+id/btnEditPhone"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Edit"
-                    android:textColor="@color/accent_coral"
-                    style="@style/Widget.Material3.Button.TextButton"/>
-
-            </LinearLayout>
-
-            <View
-                android:layout_width="match_parent"
-                android:layout_height="1dp"
-                android:background="#F0F0F0"/>
-
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:gravity="center_vertical"
-                android:paddingTop="12dp">
-
-                <LinearLayout
-                    android:layout_width="0dp"
-                    android:layout_height="wrap_content"
-                    android:layout_weight="1"
-                    android:orientation="vertical">
-
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Role"
-                        android:textSize="12sp"
-                        android:textColor="#888888"/>
-
-                    <TextView
-                        android:id="@+id/tvProfileRole"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="No role loaded"
-                        android:textSize="16sp"
-                        android:textColor="@color/accent_coral"/>
-
-                </LinearLayout>
-
-            </LinearLayout>
-
-        </LinearLayout>
-
-        <Button
-            android:id="@+id/btnLogout"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginStart="16dp"
-            android:layout_marginEnd="16dp"
-            android:layout_marginBottom="24dp"
-            android:text="Log Out"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"/>
-
-    </LinearLayout>
-
-</ScrollView>
+</FrameLayout>

android/app/src/main/res/layout/fragment_purchase_order_detail.xml

@@ -1,140 +1,154 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Purchase Order Details"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="24dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
+
+            <TextView
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Purchase Order Details"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
+                android:padding="24dp">
 
-                <TextView
-                    android:id="@+id/tvPODetailId"
-                    android:layout_width="wrap_content"
+                <LinearLayout
+                    android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:textColor="@color/text_light"
-                    android:textSize="11sp"
-                    android:textStyle="italic"
-                    android:layout_gravity="end"
-                    android:layout_marginBottom="16dp"/>
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Supplier"
-                    android:textColor="@color/text_light"
-                    android:textSize="12sp"/>
+                    <TextView
+                        android:id="@+id/tvPODetailId"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textColor="@color/text_light"
+                        android:textSize="11sp"
+                        android:textStyle="italic"
+                        android:layout_gravity="end"
+                        android:layout_marginBottom="16dp"/>
 
-                <TextView
-                    android:id="@+id/tvPODetailSupplier"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textColor="@color/text_dark"
-                    android:textSize="16sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Supplier"
+                        android:textColor="@color/text_light"
+                        android:textSize="12sp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Store"
-                    android:textColor="@color/text_light"
-                    android:textSize="12sp"/>
+                    <TextView
+                        android:id="@+id/tvPODetailSupplier"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textColor="@color/text_dark"
+                        android:textSize="16sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="16dp"/>
 
-                <TextView
-                    android:id="@+id/tvPODetailStore"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textColor="@color/text_dark"
-                    android:textSize="16sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Store"
+                        android:textColor="@color/text_light"
+                        android:textSize="12sp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Order Date"
-                    android:textColor="@color/text_light"
-                    android:textSize="12sp"/>
+                    <TextView
+                        android:id="@+id/tvPODetailStore"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textColor="@color/text_dark"
+                        android:textSize="16sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="16dp"/>
 
-                <TextView
-                    android:id="@+id/tvPODetailDate"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textColor="@color/text_dark"
-                    android:textSize="15sp"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Order Date"
+                        android:textColor="@color/text_light"
+                        android:textSize="12sp"/>
 
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Status"
-                    android:textColor="@color/text_light"
-                    android:textSize="12sp"/>
+                    <TextView
+                        android:id="@+id/tvPODetailDate"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textColor="@color/text_dark"
+                        android:textSize="15sp"
+                        android:layout_marginBottom="16dp"/>
 
-                <TextView
-                    android:id="@+id/tvPODetailStatus"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textSize="15sp"
-                    android:layout_marginBottom="16dp"/>
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Status"
+                        android:textColor="@color/text_light"
+                        android:textSize="12sp"/>
+
+                    <TextView
+                        android:id="@+id/tvPODetailStatus"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textSize="15sp"
+                        android:layout_marginBottom="16dp"/>
+
+                </LinearLayout>
 
             </LinearLayout>
 
-        </LinearLayout>
+        </ScrollView>
 
-    </ScrollView>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:background="@color/white"
-        android:padding="16dp">
-
-        <Button
-            android:id="@+id/btnPOBack"
+        <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
+            android:background="@color/white"
+            android:padding="16dp">
+
+            <Button
+                android:id="@+id/btnPOBack"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+        </LinearLayout>
 
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>

android/app/src/main/res/layout/fragment_refund.xml

@@ -1,222 +1,236 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="@color/background_grey">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="56dp"
-        android:background="@color/primary_dark"
-        android:gravity="center_vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:orientation="horizontal">
-
-        <TextView
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Process Refund"
-            android:textColor="@color/white"
-            android:textSize="20sp"
-            android:textStyle="bold"/>
-
-    </LinearLayout>
-
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1">
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:background="@color/background_grey">
 
         <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:padding="16dp">
+            android:layout_height="56dp"
+            android:background="@color/primary_dark"
+            android:gravity="center_vertical"
+            android:paddingStart="16dp"
+            android:paddingEnd="16dp"
+            android:orientation="horizontal">
 
-            <!-- Load Sale Card -->
-            <LinearLayout
-                android:layout_width="match_parent"
+            <TextView
+                android:layout_width="0dp"
                 android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Load Original Sale"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="8dp"/>
-
-                <LinearLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="horizontal"
-                    android:gravity="center_vertical">
-
-                    <EditText
-                        android:id="@+id/etRefundSaleId"
-                        android:layout_width="0dp"
-                        android:layout_height="wrap_content"
-                        android:layout_weight="1"
-                        android:hint="Enter Sale ID"
-                        android:inputType="number"
-                        android:layout_marginEnd="8dp"/>
-
-                    <Button
-                        android:id="@+id/btnLoadSale"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Load"
-                        android:backgroundTint="@color/primary_medium"
-                        android:textColor="@color/white"/>
-
-                </LinearLayout>
-
-                <TextView
-                    android:id="@+id/tvSaleInfo"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textColor="@color/text_light"
-                    android:textSize="12sp"
-                    android:layout_marginTop="8dp"
-                    android:visibility="gone"/>
-
-            </LinearLayout>
-
-            <!-- Original Sale Items Card -->
-            <LinearLayout
-                android:id="@+id/cardOriginalItems"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp"
-                android:visibility="gone">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Original Sale Items"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="8dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llOriginalItems"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-            </LinearLayout>
-
-            <!-- Refund Items Card -->
-            <LinearLayout
-                android:id="@+id/cardRefundItems"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp"
-                android:visibility="gone">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Items to Refund"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="8dp"/>
-
-                <LinearLayout
-                    android:id="@+id/llRefundItems"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:orientation="vertical"/>
-
-                <TextView
-                    android:id="@+id/tvRefundTotal"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Refund Total: $0.00"
-                    android:textColor="@color/accent_coral"
-                    android:textSize="16sp"
-                    android:textStyle="bold"
-                    android:layout_gravity="end"
-                    android:layout_marginTop="12dp"/>
-
-            </LinearLayout>
-
-            <!-- Payment Method Card -->
-            <LinearLayout
-                android:id="@+id/cardPayment"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:background="@drawable/rounded_card"
-                android:padding="16dp"
-                android:layout_marginBottom="16dp"
-                android:visibility="gone">
-
-                <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Refund Payment Method"
-                    android:textColor="@color/text_dark"
-                    android:textSize="14sp"
-                    android:textStyle="bold"
-                    android:layout_marginBottom="8dp"/>
-
-                <Spinner
-                    android:id="@+id/spinnerRefundPayment"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"/>
-
-            </LinearLayout>
+                android:layout_weight="1"
+                android:text="Process Refund"
+                android:textColor="@color/white"
+                android:textSize="20sp"
+                android:textStyle="bold"/>
 
         </LinearLayout>
 
-    </ScrollView>
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1">
 
-    <!-- Bottom Buttons -->
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:background="@color/white"
-        android:padding="16dp">
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:padding="16dp">
 
-        <Button
-            android:id="@+id/btnRefundBack"
-            android:layout_width="0dp"
+                <!-- Load Sale Card -->
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Load Original Sale"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="8dp"/>
+
+                    <LinearLayout
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="horizontal"
+                        android:gravity="center_vertical">
+
+                        <EditText
+                            android:id="@+id/etRefundSaleId"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_weight="1"
+                            android:hint="Enter Sale ID"
+                            android:inputType="number"
+                            android:layout_marginEnd="8dp"/>
+
+                        <Button
+                            android:id="@+id/btnLoadSale"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:text="Load"
+                            android:backgroundTint="@color/primary_medium"
+                            android:textColor="@color/white"/>
+
+                    </LinearLayout>
+
+                    <TextView
+                        android:id="@+id/tvSaleInfo"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:textColor="@color/text_light"
+                        android:textSize="12sp"
+                        android:layout_marginTop="8dp"
+                        android:visibility="gone"/>
+
+                </LinearLayout>
+
+                <!-- Original Sale Items Card -->
+                <LinearLayout
+                    android:id="@+id/cardOriginalItems"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp"
+                    android:visibility="gone">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Original Sale Items"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="8dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llOriginalItems"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                </LinearLayout>
+
+                <!-- Refund Items Card -->
+                <LinearLayout
+                    android:id="@+id/cardRefundItems"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp"
+                    android:visibility="gone">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Items to Refund"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="8dp"/>
+
+                    <LinearLayout
+                        android:id="@+id/llRefundItems"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:orientation="vertical"/>
+
+                    <TextView
+                        android:id="@+id/tvRefundTotal"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Refund Total: $0.00"
+                        android:textColor="@color/accent_coral"
+                        android:textSize="16sp"
+                        android:textStyle="bold"
+                        android:layout_gravity="end"
+                        android:layout_marginTop="12dp"/>
+
+                </LinearLayout>
+
+                <!-- Payment Method Card -->
+                <LinearLayout
+                    android:id="@+id/cardPayment"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="vertical"
+                    android:background="@drawable/rounded_card"
+                    android:padding="16dp"
+                    android:layout_marginBottom="16dp"
+                    android:visibility="gone">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Refund Payment Method"
+                        android:textColor="@color/text_dark"
+                        android:textSize="14sp"
+                        android:textStyle="bold"
+                        android:layout_marginBottom="8dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerRefundPayment"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"/>
+
+                </LinearLayout>
+
+            </LinearLayout>
+
+        </ScrollView>
+
+        <!-- Bottom Buttons -->
+        <LinearLayout
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginEnd="8dp"
-            android:text="Back"
-            android:backgroundTint="@color/primary_medium"
-            android:textColor="@color/white"/>
+            android:orientation="horizontal"
+            android:background="@color/white"
+            android:padding="16dp">
 
-        <Button
-            android:id="@+id/btnProcessRefund"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:layout_marginStart="8dp"
-            android:text="Process Refund"
-            android:backgroundTint="@color/accent_coral"
-            android:textColor="@color/white"
-            android:visibility="gone"/>
+            <Button
+                android:id="@+id/btnRefundBack"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginEnd="8dp"
+                android:text="Back"
+                android:backgroundTint="@color/primary_medium"
+                android:textColor="@color/white"/>
+
+            <Button
+                android:id="@+id/btnProcessRefund"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="8dp"
+                android:text="Process Refund"
+                android:backgroundTint="@color/accent_coral"
+                android:textColor="@color/white"
+                android:visibility="gone"/>
+
+        </LinearLayout>
 
     </LinearLayout>
 
-</LinearLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="gone"
+        android:indeterminateTint="@color/accent_coral"/>
+
+</FrameLayout>