csep-2025/client/src/main/java/client/Ingredient/IngredientController.java

package client.Ingredient;

import commons.Ingredient;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Alert.AlertType;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.ListView;
import javafx.scene.control.Button;
import org.springframework.web.client.RestTemplate;
import org.springframework.http.ResponseEntity;
import org.springframework.http.HttpStatus;

public class IngredientController {

    @FXML
    private ListView<Ingredient> ingredientListView;

    @FXML
    private Button deleteButton;

    private final RestTemplate restTemplate = new RestTemplate();  // Simplified REST client

    @FXML
    private void handleDeleteIngredient(ActionEvent event) {
        // Get selected ingredient
        Ingredient selectedIngredient = ingredientListView.getSelectionModel().getSelectedItem();
        if (selectedIngredient == null) {
            showError("No ingredient selected", "Please select an ingredient to delete.");
            return;
        }

        // Check if the ingredient is used in any recipe
        checkIngredientUsage(selectedIngredient);
    }

    private void checkIngredientUsage(Ingredient ingredient) {
        String url = "http://localhost:8080/api/ingredients/" + ingredient.getId() + "/usage";

        ResponseEntity<IngredientUsageResponse> response = restTemplate.getForEntity(url, IngredientUsageResponse.class);

        if (response.getStatusCode() == HttpStatus.NOT_FOUND) {
            showError("Ingredient not found", "The ingredient does not exist.");
            return;
        }

        IngredientUsageResponse usageResponse = response.getBody();
        long usedInRecipes = usageResponse != null ? usageResponse.getUsedInRecipes() : 0;

        if (usedInRecipes > 0) {
            // If ingredient is in use, show warning to the user
            showWarningDialog(ingredient, usedInRecipes);
        } else {
            // delete if not in use
            deleteIngredient(ingredient);
        }
    }

    private void showWarningDialog(Ingredient ingredient, long usedInRecipes) {
        Alert alert = new Alert(AlertType.WARNING);
        alert.setTitle("Warning");
        alert.setHeaderText("Ingredient in Use");
        alert.setContentText("The ingredient '" + ingredient.getName() + "' is used in " + usedInRecipes + " recipe(s). Are you sure you want to delete it?");

        ButtonType deleteButton = new ButtonType("Delete Anyway");
        ButtonType cancelButton = new ButtonType("Cancel");

        alert.getButtonTypes().setAll(deleteButton, cancelButton);

        alert.showAndWait().ifPresent(response -> {
            if (response == deleteButton) {
                // delete if the user confirms
                deleteIngredient(ingredient);
            }
        });
    }

    private void deleteIngredient(Ingredient ingredient) {
        String url = "http://localhost:8080/api/ingredients/" + ingredient.getId();

        restTemplate.delete(url);
        showConfirmation("Deletion Successful", "The ingredient '" + ingredient.getName() + "' has been successfully deleted.");

        // refresh
        refreshIngredientList();
    }

    private void showError(String title, String message) {
        Alert alert = new Alert(AlertType.ERROR);
        alert.setTitle(title);
        alert.setHeaderText(null);
        alert.setContentText(message);
        alert.showAndWait();
    }

    private void showConfirmation(String title, String message) {
        Alert alert = new Alert(AlertType.INFORMATION);
        alert.setTitle(title);
        alert.setHeaderText(null);
        alert.setContentText(message);
        alert.showAndWait();
    }

    private void refreshIngredientList() {
        // Refresh
        ingredientListView.getItems().clear();
    }

    // Inner class for usage response
    public static class IngredientUsageResponse {
        private long ingredientId;
        private long usedInRecipes;

        public long getIngredientId() {
            return ingredientId;
        }

        public void setIngredientId(long ingredientId) {
            this.ingredientId = ingredientId;
        }

        public long getUsedInRecipes() {
            return usedInRecipes;
        }

        public void setUsedInRecipes(long usedInRecipes) {
            this.usedInRecipes = usedInRecipes;
        }
    }
}