aaa

lib/features/products/presentation/providers/product_detail_provider.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../../domain/entities/product_stage_entity.dart';
+import '../../domain/usecases/get_product_detail_usecase.dart';
+
+/// Product detail state class
+/// Holds the current state of product stages and selection
+class ProductDetailState {
+  final List<ProductStageEntity> stages;
+  final int selectedStageIndex;
+  final bool isLoading;
+  final String? error;
+
+  const ProductDetailState({
+    this.stages = const [],
+    this.selectedStageIndex = 0,
+    this.isLoading = false,
+    this.error,
+  });
+
+  /// Get the currently selected stage
+  ProductStageEntity? get selectedStage {
+    if (stages.isEmpty || selectedStageIndex >= stages.length) {
+      return null;
+    }
+    return stages[selectedStageIndex];
+  }
+
+  /// Check if there are any stages loaded
+  bool get hasStages => stages.isNotEmpty;
+
+  ProductDetailState copyWith({
+    List<ProductStageEntity>? stages,
+    int? selectedStageIndex,
+    bool? isLoading,
+    String? error,
+  }) {
+    return ProductDetailState(
+      stages: stages ?? this.stages,
+      selectedStageIndex: selectedStageIndex ?? this.selectedStageIndex,
+      isLoading: isLoading ?? this.isLoading,
+      error: error,
+    );
+  }
+}
+
+/// Product detail notifier
+/// Manages the product detail state and business logic
+class ProductDetailNotifier extends StateNotifier<ProductDetailState> {
+  final GetProductDetailUseCase getProductDetailUseCase;
+
+  ProductDetailNotifier(this.getProductDetailUseCase)
+      : super(const ProductDetailState());
+
+  /// Load product stages for a specific warehouse and product
+  ///
+  /// [warehouseId] - The ID of the warehouse
+  /// [productId] - The ID of the product
+  Future<void> loadProductDetail(int warehouseId, int productId) async {
+    // Set loading state
+    state = state.copyWith(
+      isLoading: true,
+      error: null,
+    );
+
+    // Call the use case
+    final result = await getProductDetailUseCase(warehouseId, productId);
+
+    // Handle the result
+    result.fold(
+      (failure) {
+        // Handle failure
+        state = state.copyWith(
+          isLoading: false,
+          error: failure.message,
+          stages: [],
+        );
+      },
+      (stages) {
+        // Handle success - load all stages
+        state = state.copyWith(
+          isLoading: false,
+          error: null,
+          stages: stages,
+          selectedStageIndex: 0, // Select first stage by default
+        );
+      },
+    );
+  }
+
+  /// Select a stage by index
+  void selectStage(int index) {
+    if (index >= 0 && index < state.stages.length) {
+      state = state.copyWith(selectedStageIndex: index);
+    }
+  }
+
+  /// Refresh product stages
+  Future<void> refreshProductDetail(int warehouseId, int productId) async {
+    await loadProductDetail(warehouseId, productId);
+  }
+
+  /// Clear product detail
+  void clearProductDetail() {
+    state = const ProductDetailState();
+  }
+}