updated inventory backend to have filter by store and added more search features to andriod

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

@@ -16,12 +16,14 @@ import retrofit2.http.Query;
 
 public interface InventoryApi {
 
-    // GET /api/v1/inventory?q=...&page=...&size=...
+    // GET /api/v1/inventory?q=...&page=...&size=...&category=...&storeId=...&sort=...
     @GET("api/v1/inventory")
     Call<PageResponse<InventoryDTO>> getAllInventory(
-            @Query("q") String query,
             @Query("page") int page,
             @Query("size") int size,
+            @Query("q") String query,
+            @Query("category") String category,
+            @Query("storeId") Long storeId,
             @Query("sort") String sort);
 
     // GET /api/v1/inventory/{id}

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

@@ -12,8 +12,10 @@ public interface ProductApi {
     @GET("api/v1/products")
     Call<PageResponse<ProductDTO>> getAllProducts(
             @Query("q") String query,
+            @Query("categoryId") Long categoryId,
             @Query("page") int page,
-            @Query("size") int size);
+            @Query("size") int size,
+            @Query("sort") String sort);
 
     @GET("api/v1/products/{id}")
     Call<ProductDTO> getProductById(@Path("id") Long id);

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

@@ -1,8 +1,6 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Looper;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.Log;
@@ -21,14 +19,14 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.example.petstoremobile.R;
-import com.example.petstoremobile.adapters.BlackTextArrayAdapter;
 import com.example.petstoremobile.adapters.InventoryAdapter;
 import com.example.petstoremobile.databinding.FragmentInventoryBinding;
-import com.example.petstoremobile.dtos.CategoryDTO;
 import com.example.petstoremobile.dtos.InventoryDTO;
+import com.example.petstoremobile.dtos.StoreDTO;
 import com.example.petstoremobile.fragments.ListFragment;
 import com.example.petstoremobile.viewmodels.InventoryViewModel;
 import com.example.petstoremobile.utils.Resource;
+import com.example.petstoremobile.utils.SpinnerUtils;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -43,26 +41,15 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
 
     private FragmentInventoryBinding binding;
     private final List<InventoryDTO> inventoryList = new ArrayList<>();
-    private final List<CategoryDTO> categoryList = new ArrayList<>();
+    private List<StoreDTO> storeList = new ArrayList<>();
     private InventoryAdapter adapter;
     private InventoryViewModel viewModel;
 
-    // Debounce search
-    private final Handler searchHandler = new Handler(Looper.getMainLooper());
-    private Runnable searchRunnable;
-    private String currentQuery = "";
-
-    // Selected category filter — null means "All"
-    private String selectedCategory = null;
-
     // Pagination
     private int currentPage = 0;
     private boolean isLastPage = false;
     private boolean isLoading = false;
 
-    // Prevent spinner from firing on initial load
-    private boolean spinnerReady = false;
-
     /**
      * Initializes the fragment and its ViewModel.
      */
@@ -73,7 +60,7 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
     }
 
     /**
-     * Sets up the fragment's UI components, including the inventory list, search, and category filter.
+     * Sets up the fragment's UI components, including the inventory list and search.
      */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
@@ -82,9 +69,11 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
 
         setupRecyclerView();
         setupSearch();
+        setupStoreFilter();
         setupSwipeRefresh();
-        loadCategories(); // loads categories then triggers loadInventory
+        setupFilterToggle();
         loadInventory(true);
+        loadStoreData();
 
         binding.fabAddInventory.setOnClickListener(v -> openDetail(null));
 
@@ -110,83 +99,59 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
     }
 
     /**
-     * Fetches all product categories to populate the filter spinner.
+     * Sets up the filter toggle button to show/hide the filter layout.
      */
-    private void loadCategories() {
+    private void setupFilterToggle() {
-        viewModel.getAllCategories(0, 100).observe(getViewLifecycleOwner(), resource -> {
+        binding.btnToggleFilter.setOnClickListener(v -> {
-            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+            if (binding.layoutFilter.getVisibility() == View.GONE) {
-                categoryList.clear();
+                binding.layoutFilter.setVisibility(View.VISIBLE);
-                categoryList.addAll(resource.data.getContent());
+                binding.btnToggleFilter.setImageResource(android.R.drawable.ic_menu_close_clear_cancel);
-                setupCategorySpinner();
-            } else if (resource != null && resource.status == Resource.Status.ERROR) {
-                Log.e(TAG, "Failed to load categories: " + resource.message);
-                setupCategorySpinner();
-            }
-        });
-    }
-
-    /**
-     * Setup the category filter spinner.
-     */
-    private void setupCategorySpinner() {
-        // First item is always "All Categories"
-        List<String> categoryNames = new ArrayList<>();
-        categoryNames.add("All Categories");
-        for (CategoryDTO c : categoryList) {
-            categoryNames.add(c.getCategoryName());
-        }
-
-        if (getContext() != null) {
-            BlackTextArrayAdapter<String> spinnerAdapter = new BlackTextArrayAdapter<>(
-                    requireContext(),
-                    android.R.layout.simple_spinner_item,
-                    categoryNames);
-            spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
-            binding.spinnerCategory.setAdapter(spinnerAdapter);
-
-            binding.spinnerCategory.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
-                @Override
-                public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
-                    if (!spinnerReady) {
-                        // Skip the first automatic trigger on setup
-                        spinnerReady = true;
-                        return;
-                    }
-                    if (position == 0) {
-                        selectedCategory = null; // "All Categories"
             } else {
-                        selectedCategory = categoryList.get(position - 1).getCategoryName();
+                binding.layoutFilter.setVisibility(View.GONE);
-                    }
+                binding.btnToggleFilter.setImageResource(android.R.drawable.ic_menu_search);
-                    loadInventory(true);
-                }
 
-                @Override
+                // Reset filters when closing
-                public void onNothingSelected(AdapterView<?> parent) {
+                binding.etSearchInventory.setText("");
+                binding.spinnerStore.setSelection(0);
             }
         });
     }
-    }
 
     /**
      * Sets up the search bar for filtering.
      */
     private void setupSearch() {
         binding.etSearchInventory.addTextChangedListener(new TextWatcher() {
-            @Override public void beforeTextChanged(CharSequence s, int i, int i1, int i2) {
+            @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
-            }
+            @Override public void onTextChanged(CharSequence s, int start, int before, int count) {
-
-            @Override public void afterTextChanged(Editable s) {
-            }
-
-            @Override
-            public void onTextChanged(CharSequence s, int start, int before, int count) {
-                if (searchRunnable != null)
-                    searchHandler.removeCallbacks(searchRunnable);
-                searchRunnable = () -> {
-                    currentQuery = s.toString().trim();
                 loadInventory(true);
-                };
+            }
-                searchHandler.postDelayed(searchRunnable, 400);
+            @Override public void afterTextChanged(Editable s) {}
+        });
+    }
+
+    /**
+     * Configures the store filter spinner.
+     */
+    private void setupStoreFilter() {
+        binding.spinnerStore.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                loadInventory(true);
+            }
+            @Override public void onNothingSelected(AdapterView<?> parent) {}
+        });
+    }
+
+    /**
+     * 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);
             }
         });
     }
@@ -228,19 +193,24 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
      * Fetches a page of inventory items from the API.
      */
     private void loadInventory(boolean reset) {
-        if (isLoading)
+        if (isLoading) return;
-            return;
 
         if (reset) {
             currentPage = 0;
             isLastPage = false;
         }
 
-        // Build query: combine search text + selected category
+        // Search text from input
-        String q = buildQuery();
+        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();
+        }
 
         //Load all inventory items from the backend using viewModel
-        viewModel.getAllInventory(q, currentPage, PAGE_SIZE, "inventoryId,asc").observe(getViewLifecycleOwner(), resource -> {
+        viewModel.getAllInventory(query, null, 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
@@ -273,22 +243,6 @@ public class InventoryFragment extends Fragment implements InventoryAdapter.OnIn
         });
     }
 
-    /**
-     * Constructs a query string based on the current search text and selected category.
-     */
-    private String buildQuery() {
-        String q = null;
-        if (!currentQuery.isEmpty() && selectedCategory != null) {
-            // Both active — prioritize search text, category acts as context
-            q = currentQuery;
-        } else if (!currentQuery.isEmpty()) {
-            q = currentQuery;
-        } else if (selectedCategory != null) {
-            q = selectedCategory;
-        }
-        return q;
-    }
-
     /**
      * Displays a confirmation dialog before performing a bulk deletion of selected items.
      */

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

@@ -1,10 +1,7 @@
 package com.example.petstoremobile.fragments.listfragments;
 
 import android.os.Bundle;
-import android.text.*;
+
-import android.util.Log;
-import android.view.*;
-import android.widget.*;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
@@ -12,15 +9,27 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.Toast;
+
 import com.example.petstoremobile.R;
 import com.example.petstoremobile.adapters.ProductAdapter;
-import com.example.petstoremobile.api.auth.TokenManager;
 import com.example.petstoremobile.databinding.FragmentProductBinding;
+import com.example.petstoremobile.dtos.CategoryDTO;
 import com.example.petstoremobile.dtos.ProductDTO;
 import com.example.petstoremobile.fragments.ListFragment;
+import com.example.petstoremobile.utils.Resource;
+import com.example.petstoremobile.utils.SpinnerUtils;
 import com.example.petstoremobile.viewmodels.ProductViewModel;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.List;
 
 import javax.inject.Inject;
 import javax.inject.Named;
@@ -32,12 +41,11 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
 
     private FragmentProductBinding binding;
     private List<ProductDTO> productList = new ArrayList<>();
-    private List<ProductDTO> filteredList = new ArrayList<>();
+    private List<CategoryDTO> categoryList = new ArrayList<>();
     private ProductAdapter adapter;
     private ProductViewModel viewModel;
 
     @Inject @Named("baseUrl") String baseUrl;
-    @Inject TokenManager tokenManager;
 
     /**
      * Initializes the fragment and its associated ProductViewModel.
@@ -49,7 +57,7 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
     }
 
     /**
-     * Sets up the fragment's UI components, including the product list, search, and swipe-to-refresh.
+     * Sets up the fragment's UI components, including RecyclerView, search, and swipe-to-refresh.
      */
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
@@ -58,11 +66,11 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
 
         setupRecyclerView();
         setupSearch();
+        setupCategoryFilter();
         setupSwipeRefresh();
+        setupFilterToggle();
 
-        loadProducts();
+        binding.fabAddProduct.setOnClickListener(v -> openProductDetails(-1));
-
-        binding.fabAddProduct.setOnClickListener(v -> openDetail(-1));
 
         binding.btnHamburgerProduct.setOnClickListener(v -> {
             Fragment parent = getParentFragment();
@@ -84,61 +92,110 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
     }
 
     /**
-     * Initializes the RecyclerView with a layout manager and adapter for displaying products.
+     * Reloads data every time the fragment becomes visible.
      */
-    private void setupRecyclerView() {
+    @Override
-        adapter = new ProductAdapter(filteredList, this);
+    public void onResume() {
-        adapter.setBaseUrl(baseUrl);
+        super.onResume();
-        adapter.setToken(tokenManager.getToken());
+        loadProductData();
-        binding.recyclerViewProducts.setLayoutManager(new LinearLayoutManager(getContext()));
+        loadCategoryData();
-        binding.recyclerViewProducts.setAdapter(adapter);
     }
 
     /**
-     * Configures the search bar for filtering.
+     * Sets up the filter toggle button to show/hide the filter layout.
      */
-    private void setupSearch() {
+    private void setupFilterToggle() {
-        binding.etSearchProduct.addTextChangedListener(new TextWatcher() {
+        binding.btnToggleFilter.setOnClickListener(v -> {
-            public void beforeTextChanged(CharSequence s, int a, int b, int c) {}
+            if (binding.layoutFilter.getVisibility() == View.GONE) {
-            public void afterTextChanged(Editable s) {}
+                binding.layoutFilter.setVisibility(View.VISIBLE);
-            public void onTextChanged(CharSequence s, int a, int b, int c) {
+                binding.btnToggleFilter.setImageResource(android.R.drawable.ic_menu_close_clear_cancel);
-                filter();
+            } else {
+                binding.layoutFilter.setVisibility(View.GONE);
+                binding.btnToggleFilter.setImageResource(android.R.drawable.ic_menu_search);
+
+                // Reset filters when closing
+                binding.etSearchProduct.setText("");
+                binding.spinnerCategory.setSelection(0);
             }
         });
     }
 
     /**
-     * Sets up the SwipeRefreshLayout to allow manual re-fetching of product data.
+     * Configures the search bar for triggering data load from backend.
+     */
+    private void setupSearch() {
+        binding.etSearchProduct.addTextChangedListener(new TextWatcher() {
+            @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
+            @Override public void onTextChanged(CharSequence s, int start, int before, int count) {
+                loadProductData();
+            }
+            @Override public void afterTextChanged(Editable s) {}
+        });
+    }
+
+    /**
+     * Configures the category filter spinner.
+     */
+    private void setupCategoryFilter() {
+        binding.spinnerCategory.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                loadProductData();
+            }
+            @Override public void onNothingSelected(AdapterView<?> parent) {}
+        });
+    }
+
+    /**
+     * 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::loadProducts);
+        binding.swipeRefreshProduct.setOnRefreshListener(this::loadProductData);
     }
 
     /**
-     * Filters the product list based on the search query across name, category, and description.
+     * Navigates to the product detail screen.
      */
-    private void filter() {
+    private void openProductDetails(int position) {
-        String query = binding.etSearchProduct.getText().toString().toLowerCase();
+        Bundle args = new Bundle();
-
+        if (position != -1) {
-        filteredList.clear();
+            ProductDTO product = productList.get(position);
-        for (ProductDTO p : productList) {
+            args.putLong("productId", product.getProdId());
-            boolean matchesSearch = query.isEmpty() || 
-                                    (p.getProdName() != null && p.getProdName().toLowerCase().contains(query)) ||
-                                    (p.getCategoryName() != null && p.getCategoryName().toLowerCase().contains(query)) ||
-                                    (p.getProdDesc() != null && p.getProdDesc().toLowerCase().contains(query));
-
-            if (matchesSearch) {
-                filteredList.add(p);
         }
+        NavHostFragment.findNavController(this).navigate(R.id.nav_product_detail, args);
     }
-        adapter.notifyDataSetChanged();
+
+    @Override
+    public void onProductClick(int position) {
+        openProductDetails(position);
     }
 
     /**
-     * Fetches all product data from the server through the ViewModel and updates the UI.
+     * Fetches product data from the server with search query, category, and sorting.
      */
-    private void loadProducts() {
+    private void loadProductData() {
-        viewModel.getAllProducts(null, 0, 100).observe(getViewLifecycleOwner(), resource -> {
+        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) {
@@ -150,12 +207,14 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
                     if (resource.data != null) {
                         productList.clear();
                         productList.addAll(resource.data.getContent());
-                        filter();
+                        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;
             }
@@ -163,20 +222,12 @@ public class ProductFragment extends Fragment implements ProductAdapter.OnProduc
     }
 
     /**
-     * Navigates to the product detail screen for a specific product or to add a new one.
+     * Initializes the RecyclerView.
      */
-    private void openDetail(int position) {
+    private void setupRecyclerView() {
-        Bundle args = new Bundle();
+        adapter = new ProductAdapter(productList, this);
-        if (position != -1) {
+        adapter.setBaseUrl(baseUrl);
-            ProductDTO p = filteredList.get(position);
+        binding.recyclerViewProducts.setLayoutManager(new LinearLayoutManager(getContext()));
-            args.putLong("prodId", p.getProdId());
+        binding.recyclerViewProducts.setAdapter(adapter);
     }
-        NavHostFragment.findNavController(this).navigate(R.id.nav_product_detail, args);
-    }
-
-    /**
-     * Handles item click in the product list.
-     */
-    @Override
-    public void onProductClick(int position) { openDetail(position); }
 }

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

@@ -154,7 +154,7 @@ public class InventoryDetailFragment extends Fragment {
      */
     private void searchProducts(String query) {
         if (getView() == null) return;
-        productViewModel.getAllProducts(query, 0, 20).observe(getViewLifecycleOwner(), resource -> {
+        productViewModel.getAllProducts(query, null, 0, 20, "prodName").observe(getViewLifecycleOwner(), resource -> {
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 productSuggestions.clear();
                 productSuggestions.addAll(resource.data.getContent());

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

@@ -89,7 +89,7 @@ public class ProductSupplierDetailFragment extends Fragment {
      * Loads the list of products from the API.
      */
     private void loadProducts() {
-        productViewModel.getAllProducts(null, 0, 200).observe(getViewLifecycleOwner(), resource -> {
+        productViewModel.getAllProducts(null, null, 0, 200, "prodName").observe(getViewLifecycleOwner(), resource -> {
             if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
                 productList = resource.data.getContent();
                 refreshProductSpinner();

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

@@ -23,10 +23,10 @@ public class InventoryRepository extends BaseRepository {
     }
 
     /**
-     * Retrieves a paginated list of inventory items from the API with optional search and sort.
+     * Retrieves a paginated list of inventory items from the API with optional search, category, storeId and sort.
      */
-    public LiveData<Resource<PageResponse<InventoryDTO>>> getAllInventory(String query, int page, int size, String sort) {
+    public LiveData<Resource<PageResponse<InventoryDTO>>> getAllInventory(String query, String category, Long storeId, int page, int size, String sort) {
-        return executeCall(inventoryApi.getAllInventory(query, page, size, sort));
+        return executeCall(inventoryApi.getAllInventory(page, size, query, category, storeId, sort));
     }
 
     /**

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

@@ -23,10 +23,10 @@ public class ProductRepository extends BaseRepository {
     }
 
     /**
-     * Retrieves a paginated list of products from the API, filtered by an optional query.
+     * Retrieves a paginated list of products from the API, filtered by an optional query, category and sorted.
      */
-    public LiveData<Resource<PageResponse<ProductDTO>>> getAllProducts(String query, int page, int size) {
+    public LiveData<Resource<PageResponse<ProductDTO>>> getAllProducts(String query, Long categoryId, int page, int size, String sort) {
-        return executeCall(productApi.getAllProducts(query, page, size));
+        return executeCall(productApi.getAllProducts(query, categoryId, page, size, sort));
     }
 
     /**

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

@@ -8,8 +8,10 @@ import com.example.petstoremobile.dtos.CategoryDTO;
 import com.example.petstoremobile.dtos.InventoryDTO;
 import com.example.petstoremobile.dtos.InventoryRequest;
 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;
@@ -22,18 +24,20 @@ import dagger.hilt.android.lifecycle.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) {
+    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, int page, int size, String sort) {
+    public LiveData<Resource<PageResponse<InventoryDTO>>> getAllInventory(String query, String category, Long storeId, int page, int size, String sort) {
-        return inventoryRepository.getAllInventory(query, page, size, sort);
+        return inventoryRepository.getAllInventory(query, category, storeId, page, size, sort);
     }
 
     /**
@@ -77,4 +81,11 @@ public class InventoryViewModel extends ViewModel {
     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/ProductViewModel.java

@@ -27,10 +27,10 @@ public class ProductViewModel extends ViewModel {
     }
 
     /**
-     * Retrieves a paginated list of products, optionally filtered by a query string.
+     * Retrieves a paginated list of products, optionally filtered by a query string, category and sorted.
      */
-    public LiveData<Resource<PageResponse<ProductDTO>>> getAllProducts(String query, int page, int size) {
+    public LiveData<Resource<PageResponse<ProductDTO>>> getAllProducts(String query, Long categoryId, int page, int size, String sort) {
-        return productRepository.getAllProducts(query, page, size);
+        return productRepository.getAllProducts(query, categoryId, page, size, sort);
     }
 
     /**

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

@@ -30,42 +30,78 @@
                 android:contentDescription="Open menu"/>
 
             <TextView
-                android:layout_width="match_parent"
+                android:layout_width="0dp"
                 android:layout_height="wrap_content"
+                android:layout_weight="1"
                 android:text="Inventory"
                 android:textColor="@color/white"
                 android:textSize="20sp"
-                android:textStyle="bold"/>
+                android:textStyle="bold"
+                android:layout_marginStart="8dp"/>
+
+            <ImageButton
+                android:id="@+id/btnToggleFilter"
+                android:layout_width="48dp"
+                android:layout_height="48dp"
+                android:src="@android:drawable/ic_menu_search"
+                android:background="?attr/selectableItemBackgroundBorderless"
+                app:tint="@color/white"
+                android:contentDescription="Toggle filter"/>
 
         </LinearLayout>
 
         <LinearLayout
+            android:id="@+id/layoutFilter"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:orientation="horizontal"
+            android:orientation="vertical"
-            android:padding="8dp"
+            android:paddingStart="12dp"
-            android:gravity="center_vertical">
+            android:paddingEnd="12dp"
+            android:paddingTop="10dp"
+            android:paddingBottom="10dp"
+            android:visibility="gone"
+            android:background="@color/primary_dark"
+            android:elevation="4dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="44dp"
+                android:background="@drawable/bg_search_bar"
+                android:gravity="center_vertical"
+                android:paddingStart="12dp"
+                android:paddingEnd="12dp">
+
+                <ImageView
+                    android:layout_width="18dp"
+                    android:layout_height="18dp"
+                    android:src="@android:drawable/ic_menu_search"
+                    android:alpha="0.6"/>
 
                 <EditText
                     android:id="@+id/etSearchInventory"
                     android:layout_width="0dp"
-                android:layout_height="48dp"
+                    android:layout_height="match_parent"
                     android:layout_weight="1"
-                android:hint="Search by product or category…"
+                    android:hint="Search by product…"
                     android:inputType="text"
-                android:drawableStart="@android:drawable/ic_menu_search"
+                    android:background="@android:color/transparent"
-                android:drawablePadding="8dp"
+                    android:textColor="@color/text_dark"
-                android:background="@android:color/white"
+                    android:textColorHint="#99000000"
-                android:padding="12dp"
+                    android:textSize="14sp"
-                android:textColor="@color/text_dark"/>
+                    android:paddingStart="8dp"
+                    android:paddingEnd="8dp"/>
+
+            </LinearLayout>
 
             <Spinner
-                android:id="@+id/spinnerCategory"
+                android:id="@+id/spinnerStore"
-                android:layout_width="140dp"
+                android:layout_width="match_parent"
-                android:layout_height="48dp"
+                android:layout_height="44dp"
-                android:layout_marginStart="8dp"
+                android:layout_marginTop="8dp"
-                android:background="@android:color/white"
+                android:background="@drawable/bg_spinner"
-                android:padding="10dp"/>
+                android:paddingStart="12dp"
+                android:paddingEnd="8dp"/>
+
         </LinearLayout>
 
         <!-- Bulk-delete action bar (hidden until long-press) -->

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

@@ -12,6 +12,7 @@
         android:orientation="vertical">
 
         <LinearLayout
+            android:id="@+id/header"
             android:layout_width="match_parent"
             android:layout_height="56dp"
             android:background="@color/primary_dark"
@@ -28,27 +29,78 @@
                 android:contentDescription="Open menu"/>
 
             <TextView
-                android:layout_width="match_parent"
+                android:layout_width="0dp"
                 android:layout_height="wrap_content"
+                android:layout_weight="1"
                 android:text="Products"
                 android:textColor="@color/white"
                 android:textSize="20sp"
-                android:textStyle="bold"/>
+                android:textStyle="bold"
+                android:layout_marginStart="8dp"/>
+
+            <ImageButton
+                android:id="@+id/btnToggleFilter"
+                android:layout_width="48dp"
+                android:layout_height="48dp"
+                android:src="@android:drawable/ic_menu_search"
+                android:background="?attr/selectableItemBackgroundBorderless"
+                app:tint="@color/white"
+                android:contentDescription="Toggle filter"/>
 
         </LinearLayout>
 
+        <LinearLayout
+            android:id="@+id/layoutFilter"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:paddingStart="12dp"
+            android:paddingEnd="12dp"
+            android:paddingTop="10dp"
+            android:paddingBottom="10dp"
+            android:visibility="gone"
+            android:background="@color/primary_dark"
+            android:elevation="4dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="44dp"
+                android:background="@drawable/bg_search_bar"
+                android:gravity="center_vertical"
+                android:paddingStart="12dp"
+                android:paddingEnd="12dp">
+
+                <ImageView
+                    android:layout_width="18dp"
+                    android:layout_height="18dp"
+                    android:src="@android:drawable/ic_menu_search"
+                    android:alpha="0.6"/>
+
                 <EditText
                     android:id="@+id/etSearchProduct"
                     android:layout_width="match_parent"
-            android:layout_height="wrap_content"
+                    android:layout_height="match_parent"
-            android:layout_margin="8dp"
+                    android:hint="Search products..."
-            android:hint="Search by name or category..."
                     android:inputType="text"
-            android:drawableStart="@android:drawable/ic_menu_search"
+                    android:background="@android:color/transparent"
-            android:drawablePadding="8dp"
+                    android:textColor="@color/text_dark"
-            android:background="@android:color/white"
+                    android:textColorHint="#99000000"
-            android:padding="12dp"
+                    android:textSize="14sp"
-            android:textColor="@color/text_dark"/>
+                    android:paddingStart="8dp"
+                    android:paddingEnd="8dp"/>
+
+            </LinearLayout>
+
+            <Spinner
+                android:id="@+id/spinnerCategory"
+                android:layout_width="match_parent"
+                android:layout_height="44dp"
+                android:layout_marginTop="8dp"
+                android:background="@drawable/bg_spinner"
+                android:paddingStart="12dp"
+                android:paddingEnd="8dp"/>
+
+        </LinearLayout>
 
         <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
             android:id="@+id/swipeRefreshProduct"

backend/src/main/java/com/petshop/backend/controller/InventoryController.java

@@ -26,8 +26,9 @@ public class InventoryController {
     @GetMapping
     public ResponseEntity<Page<InventoryResponse>> getAllInventory(
             @RequestParam(required = false) String q,
+            @RequestParam(required = false) Long storeId,
             Pageable pageable) {
-        return ResponseEntity.ok(inventoryService.getAllInventory(q, pageable));
+        return ResponseEntity.ok(inventoryService.getAllInventory(q, storeId, pageable));
     }
 
     @GetMapping("/{id}")

backend/src/main/java/com/petshop/backend/repository/InventoryRepository.java

@@ -20,8 +20,10 @@ public interface InventoryRepository extends JpaRepository<Inventory, Long> {
     Optional<Inventory> findByProductIdAndStoreId(@Param("productId") Long productId, @Param("storeId") Long storeId);
 
     @Query("SELECT i FROM Inventory i LEFT JOIN i.store s WHERE " +
+           "(:q IS NULL OR (" +
            "LOWER(i.product.prodName) LIKE LOWER(CONCAT('%', :q, '%')) OR " +
            "LOWER(i.product.category.categoryName) LIKE LOWER(CONCAT('%', :q, '%')) OR " +
-           "LOWER(s.storeName) LIKE LOWER(CONCAT('%', :q, '%'))")
+           "LOWER(s.storeName) LIKE LOWER(CONCAT('%', :q, '%')))) AND " +
-    Page<Inventory> searchInventory(@Param("q") String query, Pageable pageable);
+           "(:storeId IS NULL OR i.store.storeId = :storeId)")
+    Page<Inventory> searchInventory(@Param("q") String query, @Param("storeId") Long storeId, Pageable pageable);
 }

backend/src/main/java/com/petshop/backend/service/InventoryService.java

@@ -28,13 +28,9 @@ public class InventoryService {
         this.storeRepository = storeRepository;
     }
 
-    public Page<InventoryResponse> getAllInventory(String query, Pageable pageable) {
+    public Page<InventoryResponse> getAllInventory(String query, Long storeId, Pageable pageable) {
-        Page<Inventory> inventory;
+        String normalizedQuery = normalizeFilter(query);
-        if (query != null && !query.trim().isEmpty()) {
+        Page<Inventory> inventory = inventoryRepository.searchInventory(normalizedQuery, storeId, pageable);
-            inventory = inventoryRepository.searchInventory(query, pageable);
-        } else {
-            inventory = inventoryRepository.findAll(pageable);
-        }
         return inventory.map(this::mapToResponse);
     }
 
@@ -97,6 +93,14 @@ public class InventoryService {
         inventoryRepository.deleteAllById(request.getIds());
     }
 
+    private String normalizeFilter(String value) {
+        if (value == null) {
+            return null;
+        }
+        String trimmed = value.trim();
+        return trimmed.isEmpty() ? null : trimmed;
+    }
+
     private InventoryResponse mapToResponse(Inventory inventory) {
         StoreLocation store = inventory.getStore();
         return new InventoryResponse(