aaa

lib/features/products/domain/entities/product_stage_entity.dart

@@ -0,0 +1,58 @@
+import 'package:equatable/equatable.dart';
+
+/// Product stage entity - pure domain model
+/// Represents a product at a specific production stage with quantities
+class ProductStageEntity extends Equatable {
+  final int productId;
+  final int? productStageId;
+  final int? actionTypeId;
+  final int passedQuantity;
+  final int issuedQuantity;
+  final double issuedQuantityWeight;
+  final double passedQuantityWeight;
+  final String? stageName;
+  final String createdDate;
+
+  const ProductStageEntity({
+    required this.productId,
+    required this.productStageId,
+    required this.actionTypeId,
+    required this.passedQuantity,
+    required this.issuedQuantity,
+    required this.issuedQuantityWeight,
+    required this.passedQuantityWeight,
+    required this.stageName,
+    required this.createdDate,
+  });
+
+  /// Get display name for the stage
+  /// Returns "No Stage" if stageName is null
+  String get displayName => stageName ?? 'No Stage';
+
+  /// Check if this is a valid stage (has a stage name)
+  bool get hasStage => stageName != null && stageName!.isNotEmpty;
+
+  /// Check if this stage has any passed quantity
+  bool get hasPassedQuantity => passedQuantity > 0;
+
+  /// Check if this stage has any issued quantity
+  bool get hasIssuedQuantity => issuedQuantity > 0;
+
+  @override
+  List<Object?> get props => [
+        productId,
+        productStageId,
+        actionTypeId,
+        passedQuantity,
+        issuedQuantity,
+        issuedQuantityWeight,
+        passedQuantityWeight,
+        stageName,
+        createdDate,
+      ];
+
+  @override
+  String toString() {
+    return 'ProductStageEntity(productId: $productId, stageName: $stageName, passedQuantity: $passedQuantity)';
+  }
+}

lib/features/products/domain/repositories/products_repository.dart

@@ -1,6 +1,7 @@
 import 'package:dartz/dartz.dart';
 import '../../../../core/errors/failures.dart';
 import '../entities/product_entity.dart';
+import '../entities/product_stage_entity.dart';
 
 /// Abstract repository interface for products
 /// Defines the contract for product data operations
@@ -15,4 +16,15 @@ abstract class ProductsRepository {
     int warehouseId,
     String type,
   );
+
+  /// Get product stages for a product in a warehouse
+  ///
+  /// [warehouseId] - The ID of the warehouse
+  /// [productId] - The ID of the product
+  ///
+  /// Returns Either<Failure, List<ProductStageEntity>>
+  Future<Either<Failure, List<ProductStageEntity>>> getProductDetail(
+    int warehouseId,
+    int productId,
+  );
 }

lib/features/products/domain/usecases/get_product_detail_usecase.dart

@@ -0,0 +1,25 @@
+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../entities/product_stage_entity.dart';
+import '../repositories/products_repository.dart';
+
+/// Use case for getting product stages
+/// Encapsulates the business logic for fetching product stage information
+class GetProductDetailUseCase {
+  final ProductsRepository repository;
+
+  GetProductDetailUseCase(this.repository);
+
+  /// Execute the use case
+  ///
+  /// [warehouseId] - The ID of the warehouse
+  /// [productId] - The ID of the product
+  ///
+  /// Returns Either<Failure, List<ProductStageEntity>>
+  Future<Either<Failure, List<ProductStageEntity>>> call(
+    int warehouseId,
+    int productId,
+  ) async {
+    return await repository.getProductDetail(warehouseId, productId);
+  }
+}