desktop/src/main/java/module-info.java

@@ -35,6 +35,7 @@ module org.example.petshopdesktop {
     opens org.example.petshopdesktop.api.dto.analytics to com.fasterxml.jackson.databind;
     opens org.example.petshopdesktop.api.dto.purchaseorder to com.fasterxml.jackson.databind;
     opens org.example.petshopdesktop.api.dto.activity to com.fasterxml.jackson.databind;
+    opens org.example.petshopdesktop.api.dto.coupon to com.fasterxml.jackson.databind, javafx.base;
 
     exports org.example.petshopdesktop;
     exports org.example.petshopdesktop.controllers;

desktop/src/main/java/org/example/petshopdesktop/api/dto/coupon/CouponRequest.java

@@ -0,0 +1,38 @@
+package org.example.petshopdesktop.api.dto.coupon;
+
+import java.math.BigDecimal;
+
+public class CouponRequest {
+    private String couponCode;
+    private String discountType;
+    private BigDecimal discountValue;
+    private BigDecimal minOrderAmount;
+    private Boolean active;
+    private String startsAt;
+    private String endsAt;
+    private Integer usageLimit;
+
+    public String getCouponCode() { return couponCode; }
+    public void setCouponCode(String couponCode) { this.couponCode = couponCode; }
+
+    public String getDiscountType() { return discountType; }
+    public void setDiscountType(String discountType) { this.discountType = discountType; }
+
+    public BigDecimal getDiscountValue() { return discountValue; }
+    public void setDiscountValue(BigDecimal discountValue) { this.discountValue = discountValue; }
+
+    public BigDecimal getMinOrderAmount() { return minOrderAmount; }
+    public void setMinOrderAmount(BigDecimal minOrderAmount) { this.minOrderAmount = minOrderAmount; }
+
+    public Boolean getActive() { return active; }
+    public void setActive(Boolean active) { this.active = active; }
+
+    public String getStartsAt() { return startsAt; }
+    public void setStartsAt(String startsAt) { this.startsAt = startsAt; }
+
+    public String getEndsAt() { return endsAt; }
+    public void setEndsAt(String endsAt) { this.endsAt = endsAt; }
+
+    public Integer getUsageLimit() { return usageLimit; }
+    public void setUsageLimit(Integer usageLimit) { this.usageLimit = usageLimit; }
+}

desktop/src/main/java/org/example/petshopdesktop/api/dto/coupon/CouponResponse.java

@@ -0,0 +1,52 @@
+package org.example.petshopdesktop.api.dto.coupon;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import java.math.BigDecimal;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CouponResponse {
+    private Long couponId;
+    private String couponCode;
+    private String discountType;
+    private BigDecimal discountValue;
+    private BigDecimal minOrderAmount;
+    private Boolean active;
+    private String startsAt;
+    private String endsAt;
+    private Integer usageLimit;
+    private String createdAt;
+    private String updatedAt;
+
+    public Long getCouponId() { return couponId; }
+    public void setCouponId(Long couponId) { this.couponId = couponId; }
+
+    public String getCouponCode() { return couponCode; }
+    public void setCouponCode(String couponCode) { this.couponCode = couponCode; }
+
+    public String getDiscountType() { return discountType; }
+    public void setDiscountType(String discountType) { this.discountType = discountType; }
+
+    public BigDecimal getDiscountValue() { return discountValue; }
+    public void setDiscountValue(BigDecimal discountValue) { this.discountValue = discountValue; }
+
+    public BigDecimal getMinOrderAmount() { return minOrderAmount; }
+    public void setMinOrderAmount(BigDecimal minOrderAmount) { this.minOrderAmount = minOrderAmount; }
+
+    public Boolean getActive() { return active; }
+    public void setActive(Boolean active) { this.active = active; }
+
+    public String getStartsAt() { return startsAt; }
+    public void setStartsAt(String startsAt) { this.startsAt = startsAt; }
+
+    public String getEndsAt() { return endsAt; }
+    public void setEndsAt(String endsAt) { this.endsAt = endsAt; }
+
+    public Integer getUsageLimit() { return usageLimit; }
+    public void setUsageLimit(Integer usageLimit) { this.usageLimit = usageLimit; }
+
+    public String getCreatedAt() { return createdAt; }
+    public void setCreatedAt(String createdAt) { this.createdAt = createdAt; }
+
+    public String getUpdatedAt() { return updatedAt; }
+    public void setUpdatedAt(String updatedAt) { this.updatedAt = updatedAt; }
+}

desktop/src/main/java/org/example/petshopdesktop/api/endpoints/CouponApi.java

@@ -0,0 +1,42 @@
+package org.example.petshopdesktop.api.endpoints;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import org.example.petshopdesktop.api.ApiClient;
+import org.example.petshopdesktop.api.dto.common.PageResponse;
+import org.example.petshopdesktop.api.dto.coupon.CouponRequest;
+import org.example.petshopdesktop.api.dto.coupon.CouponResponse;
+
+import java.util.List;
+
+public class CouponApi {
+    private static final CouponApi INSTANCE = new CouponApi();
+    private final ApiClient apiClient;
+
+    private CouponApi() {
+        apiClient = ApiClient.getInstance();
+    }
+
+    public static CouponApi getInstance() {
+        return INSTANCE;
+    }
+
+    public List<CouponResponse> listCoupons() throws Exception {
+        String response = apiClient.getRawResponse("/api/v1/coupons?page=0&size=1000");
+        PageResponse<CouponResponse> page = apiClient.getObjectMapper()
+                .readValue(response, new TypeReference<PageResponse<CouponResponse>>() {});
+        List<CouponResponse> content = page.getContent();
+        return content != null ? content : java.util.Collections.emptyList();
+    }
+
+    public CouponResponse createCoupon(CouponRequest request) throws Exception {
+        return apiClient.post("/api/v1/coupons", request, CouponResponse.class);
+    }
+
+    public CouponResponse updateCoupon(Long id, CouponRequest request) throws Exception {
+        return apiClient.put("/api/v1/coupons/" + id, request, CouponResponse.class);
+    }
+
+    public void deleteCoupon(Long id) throws Exception {
+        apiClient.delete("/api/v1/coupons/" + id);
+    }
+}

desktop/src/main/java/org/example/petshopdesktop/controllers/CouponController.java

@@ -0,0 +1,246 @@
+package org.example.petshopdesktop.controllers;
+
+import javafx.application.Platform;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.control.*;
+import javafx.scene.control.cell.PropertyValueFactory;
+import javafx.stage.Modality;
+import javafx.stage.Stage;
+import org.example.petshopdesktop.api.dto.coupon.CouponResponse;
+import org.example.petshopdesktop.api.endpoints.CouponApi;
+import org.example.petshopdesktop.controllers.dialogcontrollers.CouponDialogController;
+import org.example.petshopdesktop.util.ActivityLogger;
+import org.example.petshopdesktop.util.TableViewSupport;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+public class CouponController {
+
+    @FXML private Button btnAdd;
+    @FXML private Button btnEdit;
+    @FXML private Button btnDelete;
+    @FXML private Button btnRefresh;
+    @FXML private Label lblStatus;
+    @FXML private TextField txtSearch;
+    @FXML private ComboBox<String> cbStatusFilter;
+    @FXML private ComboBox<String> cbTypeFilter;
+    @FXML private TableView<CouponResponse> tvCoupons;
+    @FXML private TableColumn<CouponResponse, Long> colId;
+    @FXML private TableColumn<CouponResponse, String> colCode;
+    @FXML private TableColumn<CouponResponse, String> colDiscount;
+    @FXML private TableColumn<CouponResponse, String> colMinOrder;
+    @FXML private TableColumn<CouponResponse, String> colStatus;
+    @FXML private TableColumn<CouponResponse, String> colStartsAt;
+    @FXML private TableColumn<CouponResponse, String> colEndsAt;
+    @FXML private TableColumn<CouponResponse, String> colUsageLimit;
+
+    private final ObservableList<CouponResponse> allCoupons = FXCollections.observableArrayList();
+
+    @FXML
+    void initialize() {
+        btnEdit.setDisable(true);
+        btnDelete.setDisable(true);
+
+        tvCoupons.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
+
+        colId.setCellValueFactory(new PropertyValueFactory<>("couponId"));
+        colCode.setCellValueFactory(new PropertyValueFactory<>("couponCode"));
+
+        colDiscount.setCellValueFactory(data -> {
+            CouponResponse c = data.getValue();
+            String formatted = formatDiscount(c);
+            return new javafx.beans.property.SimpleStringProperty(formatted);
+        });
+
+        colMinOrder.setCellValueFactory(data -> {
+            BigDecimal min = data.getValue().getMinOrderAmount();
+            return new javafx.beans.property.SimpleStringProperty(
+                    min != null ? "$" + min.toPlainString() : "—");
+        });
+
+        colStatus.setCellValueFactory(data -> {
+            Boolean active = data.getValue().getActive();
+            return new javafx.beans.property.SimpleStringProperty(
+                    Boolean.TRUE.equals(active) ? "Active" : "Inactive");
+        });
+
+        colStartsAt.setCellValueFactory(data ->
+                new javafx.beans.property.SimpleStringProperty(formatDate(data.getValue().getStartsAt())));
+
+        colEndsAt.setCellValueFactory(data ->
+                new javafx.beans.property.SimpleStringProperty(formatDate(data.getValue().getEndsAt())));
+
+        colUsageLimit.setCellValueFactory(data -> {
+            Integer limit = data.getValue().getUsageLimit();
+            return new javafx.beans.property.SimpleStringProperty(limit != null ? limit.toString() : "Unlimited");
+        });
+
+        cbStatusFilter.setItems(FXCollections.observableArrayList("All", "Active", "Inactive"));
+        cbStatusFilter.setValue("All");
+        cbTypeFilter.setItems(FXCollections.observableArrayList("All", "FIXED", "PERCENT"));
+        cbTypeFilter.setValue("All");
+
+        tvCoupons.getSelectionModel().selectedItemProperty().addListener((obs, oldVal, newVal) -> {
+            boolean hasSelection = newVal != null;
+            btnEdit.setDisable(!hasSelection);
+            btnDelete.setDisable(!hasSelection);
+        });
+
+        txtSearch.textProperty().addListener((obs, oldVal, newVal) -> applyFilters());
+        cbStatusFilter.valueProperty().addListener((obs, oldVal, newVal) -> applyFilters());
+        cbTypeFilter.valueProperty().addListener((obs, oldVal, newVal) -> applyFilters());
+
+        TableViewSupport.installDoubleClickAction(tvCoupons, selected -> openDialog(selected, "Edit"));
+
+        tvCoupons.setOnKeyPressed(event -> {
+            if (event.getCode() == javafx.scene.input.KeyCode.DELETE
+                    && tvCoupons.getSelectionModel().getSelectedItem() != null) {
+                btnDeleteClicked(null);
+            }
+        });
+
+        loadCoupons();
+    }
+
+    @FXML
+    void btnAddClicked(ActionEvent event) {
+        openDialog(null, "Add");
+    }
+
+    @FXML
+    void btnEditClicked(ActionEvent event) {
+        CouponResponse selected = tvCoupons.getSelectionModel().getSelectedItem();
+        if (selected != null) {
+            openDialog(selected, "Edit");
+        }
+    }
+
+    @FXML
+    void btnDeleteClicked(ActionEvent event) {
+        List<CouponResponse> selected = tvCoupons.getSelectionModel().getSelectedItems();
+        if (selected.isEmpty()) return;
+
+        Alert question = new Alert(Alert.AlertType.CONFIRMATION);
+        question.setHeaderText("Confirm Delete");
+        question.setContentText(selected.size() == 1
+                ? "Are you sure you want to delete this coupon?"
+                : "Are you sure you want to delete " + selected.size() + " coupons?");
+        question.getDialogPane().lookupButton(ButtonType.OK).requestFocus();
+        Optional<ButtonType> result = question.showAndWait();
+
+        if (result.isPresent() && result.get() == ButtonType.OK) {
+            List<Long> ids = selected.stream().map(CouponResponse::getCouponId).collect(Collectors.toList());
+            try {
+                for (Long id : ids) {
+                    CouponApi.getInstance().deleteCoupon(id);
+                }
+                Alert alert = new Alert(Alert.AlertType.INFORMATION);
+                alert.setHeaderText("Deleted");
+                alert.setContentText("Successfully deleted " + ids.size() + " coupon(s)");
+                alert.showAndWait();
+            } catch (Exception e) {
+                ActivityLogger.getInstance().logException("CouponController.btnDeleteClicked", e, "Deleting coupons");
+                Alert alert = new Alert(Alert.AlertType.ERROR);
+                alert.setHeaderText("Delete Failed");
+                alert.setContentText(e.getMessage());
+                alert.showAndWait();
+            }
+            loadCoupons();
+            btnEdit.setDisable(true);
+            btnDelete.setDisable(true);
+        }
+    }
+
+    @FXML
+    void btnRefreshClicked(ActionEvent event) {
+        txtSearch.clear();
+        cbStatusFilter.setValue("All");
+        cbTypeFilter.setValue("All");
+        tvCoupons.getSortOrder().clear();
+        loadCoupons();
+        TableViewSupport.flashStatus(lblStatus, "Refreshed");
+    }
+
+    private void loadCoupons() {
+        new Thread(() -> {
+            try {
+                List<CouponResponse> coupons = CouponApi.getInstance().listCoupons();
+                Platform.runLater(() -> {
+                    allCoupons.setAll(coupons != null ? coupons : java.util.Collections.emptyList());
+                    applyFilters();
+                });
+            } catch (Exception e) {
+                ActivityLogger.getInstance().logException("CouponController.loadCoupons", e, "Loading coupons");
+                Platform.runLater(() -> {
+                    lblStatus.setText("Failed to load coupons: " + e.getMessage());
+                    lblStatus.setVisible(true);
+                    lblStatus.setManaged(true);
+                });
+            }
+        }).start();
+    }
+
+    private void applyFilters() {
+        String search = txtSearch.getText() == null ? "" : txtSearch.getText().trim().toLowerCase();
+        String status = cbStatusFilter.getValue();
+        String type = cbTypeFilter.getValue();
+
+        List<CouponResponse> filtered = allCoupons.stream()
+                .filter(c -> search.isEmpty() || (c.getCouponCode() != null
+                        && c.getCouponCode().toLowerCase().contains(search)))
+                .filter(c -> "All".equals(status)
+                        || ("Active".equals(status) && Boolean.TRUE.equals(c.getActive()))
+                        || ("Inactive".equals(status) && !Boolean.TRUE.equals(c.getActive())))
+                .filter(c -> "All".equals(type) || type.equals(c.getDiscountType()))
+                .collect(Collectors.toList());
+
+        tvCoupons.setItems(FXCollections.observableArrayList(filtered));
+    }
+
+    private void openDialog(CouponResponse coupon, String mode) {
+        FXMLLoader loader = new FXMLLoader(getClass().getResource(
+                "/org/example/petshopdesktop/dialogviews/coupon-dialog-view.fxml"));
+        Scene scene;
+        try {
+            scene = new Scene(loader.load());
+        } catch (IOException e) {
+            ActivityLogger.getInstance().logException("CouponController.openDialog", e, "Loading coupon dialog");
+            throw new RuntimeException(e);
+        }
+        CouponDialogController controller = loader.getController();
+        controller.setMode(mode);
+        if ("Edit".equals(mode)) {
+            controller.displayCouponDetails(coupon);
+        }
+        Stage stage = new Stage();
+        stage.initModality(Modality.APPLICATION_MODAL);
+        stage.setTitle("Add".equals(mode) ? "Add Coupon" : "Edit Coupon");
+        stage.setScene(scene);
+        stage.showAndWait();
+        loadCoupons();
+        btnEdit.setDisable(true);
+        btnDelete.setDisable(true);
+    }
+
+    private String formatDiscount(CouponResponse c) {
+        if (c.getDiscountValue() == null) return "—";
+        if ("PERCENT".equals(c.getDiscountType())) {
+            return c.getDiscountValue().stripTrailingZeros().toPlainString() + "% OFF";
+        }
+        return "$" + c.getDiscountValue().toPlainString() + " OFF";
+    }
+
+    private String formatDate(String isoDate) {
+        if (isoDate == null || isoDate.isBlank()) return "—";
+        return isoDate.length() >= 10 ? isoDate.substring(0, 10) : isoDate;
+    }
+}

desktop/src/main/java/org/example/petshopdesktop/controllers/MainLayoutController.java

@@ -91,6 +91,9 @@ public class MainLayoutController {
     @FXML
     private Button btnAnalytics;
 
+    @FXML
+    private Button btnCoupons;
+
     @FXML
     private Button btnLogout;
 
@@ -187,6 +190,12 @@ public class MainLayoutController {
         updateButtons(btnActivityLogs);
     }
 
+    @FXML
+    void btnCouponsClicked(ActionEvent event) {
+        loadView("coupon-view.fxml");
+        updateButtons(btnCoupons);
+    }
+
     @FXML
     void btnServicesClicked(ActionEvent event) {
         loadView("service-view.fxml");
@@ -415,6 +424,11 @@ public class MainLayoutController {
             btnActivityLogs.setManaged(isAdmin);
         }
 
+        if (btnCoupons != null) {
+            btnCoupons.setVisible(isAdmin);
+            btnCoupons.setManaged(isAdmin);
+        }
+
         btnSalesHistory.setText(isAdmin ? "Sales History" : "Sales");
 
         // Initial chat state and subscription
@@ -466,6 +480,7 @@ public class MainLayoutController {
             btnStaffAccounts,
             btnAnalytics,
             btnActivityLogs,
+            btnCoupons,
             btnChat
         };
 

desktop/src/main/java/org/example/petshopdesktop/controllers/dialogcontrollers/CouponDialogController.java

@@ -0,0 +1,203 @@
+package org.example.petshopdesktop.controllers.dialogcontrollers;
+
+import javafx.collections.FXCollections;
+import javafx.fxml.FXML;
+import javafx.scene.Node;
+import javafx.scene.control.*;
+import javafx.scene.input.MouseEvent;
+import javafx.stage.Stage;
+import org.example.petshopdesktop.api.dto.coupon.CouponRequest;
+import org.example.petshopdesktop.api.dto.coupon.CouponResponse;
+import org.example.petshopdesktop.api.endpoints.CouponApi;
+import org.example.petshopdesktop.util.ActivityLogger;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+
+public class CouponDialogController {
+
+    @FXML private Button btnSave;
+    @FXML private Button btnCancel;
+    @FXML private Label lblMode;
+    @FXML private Label lblCouponId;
+    @FXML private TextField txtCode;
+    @FXML private ComboBox<String> cbDiscountType;
+    @FXML private TextField txtDiscountValue;
+    @FXML private TextField txtMinOrder;
+    @FXML private DatePicker dpStartsAt;
+    @FXML private DatePicker dpEndsAt;
+    @FXML private TextField txtUsageLimit;
+    @FXML private CheckBox chkActive;
+
+    private String mode;
+    private Long couponId;
+
+    @FXML
+    void initialize() {
+        cbDiscountType.setItems(FXCollections.observableArrayList("FIXED", "PERCENT"));
+
+        dpEndsAt.setDisable(true);
+
+        dpStartsAt.setDayCellFactory(picker -> new javafx.scene.control.DateCell() {
+            @Override
+            public void updateItem(LocalDate item, boolean empty) {
+                super.updateItem(item, empty);
+                setDisable(empty || item.isBefore(LocalDate.now()));
+            }
+        });
+
+        dpStartsAt.valueProperty().addListener((obs, oldVal, newVal) -> {
+            if (newVal == null) {
+                dpEndsAt.setValue(null);
+                dpEndsAt.setDisable(true);
+            } else {
+                dpEndsAt.setDisable(false);
+                dpEndsAt.setDayCellFactory(picker -> new javafx.scene.control.DateCell() {
+                    @Override
+                    public void updateItem(LocalDate item, boolean empty) {
+                        super.updateItem(item, empty);
+                        setDisable(empty || !item.isAfter(newVal));
+                    }
+                });
+                if (dpEndsAt.getValue() != null && !dpEndsAt.getValue().isAfter(newVal)) {
+                    dpEndsAt.setValue(null);
+                }
+            }
+        });
+
+        btnSave.setOnMouseClicked(this::handleSave);
+        btnCancel.setOnMouseClicked(this::handleCancel);
+    }
+
+    public void setMode(String mode) {
+        this.mode = mode;
+        lblMode.setText(mode + " Coupon");
+        lblCouponId.setVisible("Edit".equals(mode));
+        lblCouponId.setManaged("Edit".equals(mode));
+    }
+
+    public void displayCouponDetails(CouponResponse coupon) {
+        if (coupon == null) return;
+        couponId = coupon.getCouponId();
+        lblCouponId.setText("ID: " + couponId);
+        txtCode.setText(coupon.getCouponCode() != null ? coupon.getCouponCode() : "");
+        cbDiscountType.setValue(coupon.getDiscountType());
+        txtDiscountValue.setText(coupon.getDiscountValue() != null ? coupon.getDiscountValue().toPlainString() : "");
+        txtMinOrder.setText(coupon.getMinOrderAmount() != null ? coupon.getMinOrderAmount().toPlainString() : "");
+        txtUsageLimit.setText(coupon.getUsageLimit() != null ? coupon.getUsageLimit().toString() : "");
+        chkActive.setSelected(Boolean.TRUE.equals(coupon.getActive()));
+        if (coupon.getStartsAt() != null && coupon.getStartsAt().length() >= 10) {
+            dpStartsAt.setValue(LocalDate.parse(coupon.getStartsAt().substring(0, 10)));
+        }
+        if (coupon.getEndsAt() != null && coupon.getEndsAt().length() >= 10 && dpStartsAt.getValue() != null) {
+            dpEndsAt.setValue(LocalDate.parse(coupon.getEndsAt().substring(0, 10)));
+        }
+    }
+
+    private void handleSave(MouseEvent event) {
+        String errorMsg = "";
+
+        if (txtCode.getText() == null || txtCode.getText().trim().isEmpty()) {
+            errorMsg += "Coupon Code is required\n";
+        }
+        if (cbDiscountType.getValue() == null) {
+            errorMsg += "Discount Type is required\n";
+        }
+        if (txtDiscountValue.getText() == null || txtDiscountValue.getText().trim().isEmpty()) {
+            errorMsg += "Discount Value is required\n";
+        } else {
+            try {
+                BigDecimal val = new BigDecimal(txtDiscountValue.getText().trim());
+                if (val.compareTo(BigDecimal.ZERO) <= 0) {
+                    errorMsg += "Discount Value must be greater than 0\n";
+                }
+            } catch (NumberFormatException e) {
+                errorMsg += "Discount Value must be a valid number\n";
+            }
+        }
+        if (!txtMinOrder.getText().trim().isEmpty()) {
+            try {
+                BigDecimal min = new BigDecimal(txtMinOrder.getText().trim());
+                if (min.compareTo(BigDecimal.ZERO) < 0) {
+                    errorMsg += "Min Order Amount must be 0 or greater\n";
+                }
+            } catch (NumberFormatException e) {
+                errorMsg += "Min Order Amount must be a valid number\n";
+            }
+        }
+        if (!txtUsageLimit.getText().trim().isEmpty()) {
+            try {
+                int limit = Integer.parseInt(txtUsageLimit.getText().trim());
+                if (limit <= 0) {
+                    errorMsg += "Usage Limit must be a positive number\n";
+                }
+            } catch (NumberFormatException e) {
+                errorMsg += "Usage Limit must be a valid integer\n";
+            }
+        }
+        if (dpStartsAt.getValue() != null && dpEndsAt.getValue() != null
+                && !dpEndsAt.getValue().isAfter(dpStartsAt.getValue())) {
+            errorMsg += "Ends At must be after Starts At\n";
+        }
+
+        if (!errorMsg.isEmpty()) {
+            Alert alert = new Alert(Alert.AlertType.ERROR);
+            alert.setHeaderText("Input Error");
+            alert.setContentText(errorMsg);
+            alert.showAndWait();
+            return;
+        }
+
+        CouponRequest request = buildRequest();
+        try {
+            if ("Add".equals(mode)) {
+                CouponApi.getInstance().createCoupon(request);
+            } else {
+                CouponApi.getInstance().updateCoupon(couponId, request);
+            }
+            Alert alert = new Alert(Alert.AlertType.INFORMATION);
+            alert.setHeaderText("Saved");
+            alert.setContentText(mode + " succeeded");
+            alert.showAndWait();
+            closeStage(event);
+        } catch (Exception e) {
+            ActivityLogger.getInstance().logException("CouponDialogController.handleSave", e, mode + " coupon");
+            Alert alert = new Alert(Alert.AlertType.ERROR);
+            alert.setHeaderText("Operation Error");
+            alert.setContentText(mode + " failed: " + e.getMessage());
+            alert.showAndWait();
+        }
+    }
+
+    private void handleCancel(MouseEvent event) {
+        closeStage(event);
+    }
+
+    private CouponRequest buildRequest() {
+        CouponRequest request = new CouponRequest();
+        request.setCouponCode(txtCode.getText().trim().toUpperCase());
+        request.setDiscountType(cbDiscountType.getValue());
+        request.setDiscountValue(new BigDecimal(txtDiscountValue.getText().trim()));
+        request.setActive(chkActive.isSelected());
+
+        if (!txtMinOrder.getText().trim().isEmpty()) {
+            request.setMinOrderAmount(new BigDecimal(txtMinOrder.getText().trim()));
+        }
+        if (!txtUsageLimit.getText().trim().isEmpty()) {
+            request.setUsageLimit(Integer.parseInt(txtUsageLimit.getText().trim()));
+        }
+        if (dpStartsAt.getValue() != null) {
+            request.setStartsAt(dpStartsAt.getValue().toString() + "T00:00:00");
+        }
+        if (dpEndsAt.getValue() != null) {
+            request.setEndsAt(dpEndsAt.getValue().toString() + "T23:59:59");
+        }
+        return request;
+    }
+
+    private void closeStage(MouseEvent event) {
+        Node node = (Node) event.getSource();
+        Stage stage = (Stage) node.getScene().getWindow();
+        stage.close();
+    }
+}

desktop/src/main/resources/org/example/petshopdesktop/dialogviews/coupon-dialog-view.fxml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.CheckBox?>
+<?import javafx.scene.control.ComboBox?>
+<?import javafx.scene.control.DatePicker?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.TextField?>
+<?import javafx.scene.layout.ColumnConstraints?>
+<?import javafx.scene.layout.GridPane?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.Region?>
+<?import javafx.scene.layout.RowConstraints?>
+<?import javafx.scene.layout.VBox?>
+<?import javafx.scene.text.Font?>
+
+<VBox minHeight="-Infinity" minWidth="-Infinity" prefHeight="480.0" prefWidth="790.0" spacing="20.0" style="-fx-font-size: 14px;" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="org.example.petshopdesktop.controllers.dialogcontrollers.CouponDialogController">
+    <padding>
+        <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
+    </padding>
+    <children>
+        <HBox alignment="CENTER_LEFT" prefHeight="79.0" prefWidth="727.0" spacing="20.0" style="-fx-background-color: #2C3E50; -fx-background-radius: 14;">
+            <padding>
+                <Insets left="15.0" right="15.0" />
+            </padding>
+            <children>
+                <VBox alignment="CENTER_LEFT" prefHeight="79.0" prefWidth="299.0">
+                    <padding>
+                        <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
+                    </padding>
+                    <children>
+                        <Label fx:id="lblMode" text="Add Coupon" textFill="WHITE">
+                            <font>
+                                <Font name="Comic Sans MS Bold" size="30.0" />
+                            </font>
+                        </Label>
+                        <Label fx:id="lblCouponId" text="" textFill="#ffe66d">
+                            <font>
+                                <Font size="14.0" />
+                            </font>
+                            <VBox.margin>
+                                <Insets top="10.0" />
+                            </VBox.margin>
+                        </Label>
+                    </children>
+                </VBox>
+                <Region prefHeight="79.0" prefWidth="151.0" HBox.hgrow="ALWAYS" />
+                <Button fx:id="btnCancel" mnemonicParsing="false" style="-fx-background-color: #E74c3c; -fx-cursor: hand; -fx-background-radius: 8;" text="Cancel" textFill="WHITE">
+                    <font>
+                        <Font name="System Bold" size="14.0" />
+                    </font>
+                    <padding>
+                        <Insets bottom="12.0" left="24.0" right="24.0" top="12.0" />
+                    </padding>
+                </Button>
+                <Button fx:id="btnSave" mnemonicParsing="false" style="-fx-background-color: #3fe06a; -fx-cursor: hand; -fx-background-radius: 8;" text="Save" textFill="WHITE">
+                    <font>
+                        <Font name="System Bold" size="14.0" />
+                    </font>
+                    <padding>
+                        <Insets bottom="12.0" left="24.0" right="24.0" top="12.0" />
+                    </padding>
+                </Button>
+            </children>
+        </HBox>
+        <VBox prefHeight="370.0" prefWidth="750.0" style="-fx-background-color: white; -fx-background-radius: 14; -fx-border-width: 2; -fx-border-color: #5580b5; -fx-border-radius: 14;">
+            <padding>
+                <Insets bottom="15.0" left="15.0" right="15.0" top="15.0" />
+            </padding>
+            <children>
+                <GridPane hgap="25.0" VBox.vgrow="ALWAYS">
+                    <columnConstraints>
+                        <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
+                        <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
+                    </columnConstraints>
+                    <rowConstraints>
+                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+                    </rowConstraints>
+                    <children>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0">
+                            <children>
+                                <Label text="Coupon Code:" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <TextField fx:id="txtCode" promptText="e.g. SAVE10" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10;">
+                                    <padding><Insets bottom="7.0" left="10.0" right="10.0" top="7.0" /></padding>
+                                </TextField>
+                            </children>
+                        </VBox>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.columnIndex="1">
+                            <children>
+                                <Label text="Discount Type:" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <ComboBox fx:id="cbDiscountType" prefHeight="29.0" prefWidth="336.0" promptText="Select type" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10; -fx-background-color: white;">
+                                    <padding><Insets bottom="3.0" left="10.0" right="10.0" top="3.0" /></padding>
+                                </ComboBox>
+                            </children>
+                        </VBox>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.rowIndex="1">
+                            <children>
+                                <Label text="Discount Value:" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <TextField fx:id="txtDiscountValue" promptText="e.g. 10.00" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10;">
+                                    <padding><Insets bottom="7.0" left="10.0" right="10.0" top="7.0" /></padding>
+                                </TextField>
+                            </children>
+                        </VBox>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.columnIndex="1" GridPane.rowIndex="1">
+                            <children>
+                                <Label text="Min Order Amount (optional):" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <TextField fx:id="txtMinOrder" promptText="e.g. 50.00" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10;">
+                                    <padding><Insets bottom="7.0" left="10.0" right="10.0" top="7.0" /></padding>
+                                </TextField>
+                            </children>
+                        </VBox>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.rowIndex="2">
+                            <children>
+                                <Label text="Starts At (optional):" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <DatePicker fx:id="dpStartsAt" prefHeight="29.0" prefWidth="336.0" promptText="YYYY-MM-DD" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10; -fx-background-color: white;">
+                                    <padding><Insets bottom="3.0" left="10.0" right="10.0" top="3.0" /></padding>
+                                </DatePicker>
+                            </children>
+                        </VBox>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.columnIndex="1" GridPane.rowIndex="2">
+                            <children>
+                                <Label text="Ends At (optional):" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <DatePicker fx:id="dpEndsAt" prefHeight="29.0" prefWidth="336.0" promptText="YYYY-MM-DD" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10; -fx-background-color: white;">
+                                    <padding><Insets bottom="3.0" left="10.0" right="10.0" top="3.0" /></padding>
+                                </DatePicker>
+                            </children>
+                        </VBox>
+                        <VBox prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.rowIndex="3">
+                            <children>
+                                <Label text="Usage Limit (optional):" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <TextField fx:id="txtUsageLimit" promptText="e.g. 100" style="-fx-border-color: #E8EBED; -fx-border-width: 2; -fx-border-radius: 10; -fx-background-radius: 10;">
+                                    <padding><Insets bottom="7.0" left="10.0" right="10.0" top="7.0" /></padding>
+                                </TextField>
+                            </children>
+                        </VBox>
+                        <VBox alignment="CENTER_LEFT" prefHeight="200.0" prefWidth="100.0" spacing="8.0" GridPane.columnIndex="1" GridPane.rowIndex="3">
+                            <children>
+                                <Label text="Active:" textFill="#2c3e50">
+                                    <font><Font name="System Bold" size="16.0" /></font>
+                                </Label>
+                                <CheckBox fx:id="chkActive" selected="true" text="Coupon is active" />
+                            </children>
+                        </VBox>
+                    </children>
+                    <VBox.margin>
+                        <Insets bottom="15.0" left="15.0" right="15.0" top="15.0" />
+                    </VBox.margin>
+                </GridPane>
+            </children>
+        </VBox>
+    </children>
+</VBox>

desktop/src/main/resources/org/example/petshopdesktop/main-layout-view.fxml

@@ -236,6 +236,14 @@
                                <Insets bottom="8.0" left="10.0" right="10.0" top="8.0" />
                             </padding>
                          </Button>
+                         <Button fx:id="btnCoupons" alignment="CENTER_LEFT" maxWidth="Infinity" mnemonicParsing="false" onAction="#btnCouponsClicked" style="-fx-background-color: transparent; -fx-background-radius: 8; -fx-cursor: hand; -fx-focus-color: transparent; -fx-faint-focus-color: transparent;" text="Coupons" textFill="#cbd5e1">
+                            <font>
+                               <Font name="System" size="12.0" />
+                            </font>
+                            <padding>
+                               <Insets bottom="8.0" left="10.0" right="10.0" top="8.0" />
+                            </padding>
+                         </Button>
 
                          <Button fx:id="btnLogout" alignment="CENTER_LEFT" maxWidth="Infinity" mnemonicParsing="false" onAction="#btnLogoutClicked" style="-fx-background-color: rgba(255,255,255,0.08); -fx-background-radius: 8; -fx-cursor: hand; -fx-focus-color: transparent; -fx-faint-focus-color: transparent;" text="Logout" textFill="#e2e8f0">
                            <font>

desktop/src/main/resources/org/example/petshopdesktop/modelviews/coupon-view.fxml

@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.ComboBox?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.TableColumn?>
+<?import javafx.scene.control.TableView?>
+<?import javafx.scene.control.TextField?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.Region?>
+<?import javafx.scene.layout.VBox?>
+<?import javafx.scene.text.Font?>
+
+<VBox minHeight="-Infinity" minWidth="-Infinity" spacing="20.0" style="-fx-font-size: 14px;" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="org.example.petshopdesktop.controllers.CouponController">
+    <padding>
+        <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
+    </padding>
+    <children>
+        <HBox alignment="CENTER_LEFT" prefHeight="100.0" prefWidth="200.0" spacing="20.0">
+            <children>
+                <Label text="Coupons" textFill="#2c3e50">
+                    <font>
+                        <Font name="System Bold" size="30.0" />
+                    </font>
+                </Label>
+                <Region prefHeight="200.0" prefWidth="200.0" HBox.hgrow="ALWAYS" />
+                <Button fx:id="btnAdd" mnemonicParsing="false" onAction="#btnAddClicked" style="-fx-background-color: #FF6B6B; -fx-cursor: hand; -fx-background-radius: 8;" text="Add New" textFill="WHITE">
+                    <font><Font name="System Bold" size="14.0" /></font>
+                    <padding><Insets bottom="12.0" left="24.0" right="24.0" top="12.0" /></padding>
+                </Button>
+                <Button fx:id="btnEdit" mnemonicParsing="false" onAction="#btnEditClicked" style="-fx-background-color: #4ECDC4; -fx-cursor: hand; -fx-background-radius: 8;" text="Edit" textFill="WHITE">
+                    <font><Font name="System Bold" size="14.0" /></font>
+                    <padding><Insets bottom="12.0" left="24.0" right="24.0" top="12.0" /></padding>
+                </Button>
+                <Button fx:id="btnDelete" mnemonicParsing="false" onAction="#btnDeleteClicked" style="-fx-background-color: #E74C3C; -fx-cursor: hand; -fx-background-radius: 8;" text="Delete" textFill="WHITE">
+                    <font><Font name="System Bold" size="14.0" /></font>
+                    <padding><Insets bottom="12.0" left="24.0" right="24.0" top="12.0" /></padding>
+                </Button>
+                <Button fx:id="btnRefresh" mnemonicParsing="false" onAction="#btnRefreshClicked" style="-fx-background-color: #4ECDC4; -fx-cursor: hand; -fx-background-radius: 8;" text="Refresh" textFill="WHITE">
+                    <font><Font name="System Bold" size="14.0" /></font>
+                    <padding><Insets bottom="12.0" left="24.0" right="24.0" top="12.0" /></padding>
+                </Button>
+            </children>
+        </HBox>
+        <HBox alignment="CENTER_LEFT" prefHeight="37.0" prefWidth="727.0" spacing="10.0" style="-fx-background-color: white; -fx-background-radius: 14; -fx-border-width: 2; -fx-border-radius: 14;">
+            <padding>
+                <Insets bottom="10.0" left="15.0" right="15.0" top="10.0" />
+            </padding>
+            <children>
+                <TextField fx:id="txtSearch" prefHeight="31.0" prefWidth="150.0" promptText="Search by code..." style="-fx-border-width: 0; -fx-background-color: transparent;" HBox.hgrow="ALWAYS">
+                    <font><Font size="15.0" /></font>
+                </TextField>
+                <ComboBox fx:id="cbStatusFilter" prefWidth="140.0" promptText="Status" />
+                <ComboBox fx:id="cbTypeFilter" prefWidth="140.0" promptText="Discount Type" />
+            </children>
+        </HBox>
+        <Label fx:id="lblStatus" text="" textFill="#64748b" visible="false" managed="false">
+            <font><Font size="13.0" /></font>
+        </Label>
+        <TableView fx:id="tvCoupons" prefHeight="362.0" prefWidth="752.0" style="-fx-background-color: white; -fx-background-radius: 12;" VBox.vgrow="ALWAYS">
+            <columns>
+                <TableColumn fx:id="colId" prefWidth="55.0" text="ID" />
+                <TableColumn fx:id="colCode" prefWidth="120.0" text="Code" />
+                <TableColumn fx:id="colDiscount" prefWidth="130.0" text="Discount" />
+                <TableColumn fx:id="colMinOrder" prefWidth="110.0" text="Min Order" />
+                <TableColumn fx:id="colStatus" prefWidth="90.0" text="Status" />
+                <TableColumn fx:id="colStartsAt" prefWidth="110.0" text="Starts At" />
+                <TableColumn fx:id="colEndsAt" prefWidth="110.0" text="Ends At" />
+                <TableColumn fx:id="colUsageLimit" prefWidth="100.0" text="Usage Limit" />
+            </columns>
+        </TableView>
+    </children>
+</VBox>