add favorite

lib/features/favorites/domain/entities/favorite.dart

@@ -1,67 +0,0 @@
-/// Domain Entity: Favorite
-///
-/// Pure business entity representing a user's favorite product.
-/// This entity is framework-independent and contains only business logic.
-library;
-
-/// Favorite Entity
-///
-/// Represents a product that a user has marked as favorite.
-/// Used across all layers but originates in the domain layer.
-class Favorite {
-  /// Unique identifier for the favorite entry
-  final String favoriteId;
-
-  /// Reference to the product that was favorited
-  final String productId;
-
-  /// Reference to the user who favorited the product
-  final String userId;
-
-  /// Timestamp when the product was favorited
-  final DateTime createdAt;
-
-  const Favorite({
-    required this.favoriteId,
-    required this.productId,
-    required this.userId,
-    required this.createdAt,
-  });
-
-  /// Copy with method for creating modified copies
-  Favorite copyWith({
-    String? favoriteId,
-    String? productId,
-    String? userId,
-    DateTime? createdAt,
-  }) {
-    return Favorite(
-      favoriteId: favoriteId ?? this.favoriteId,
-      productId: productId ?? this.productId,
-      userId: userId ?? this.userId,
-      createdAt: createdAt ?? this.createdAt,
-    );
-  }
-
-  @override
-  String toString() {
-    return 'Favorite(favoriteId: $favoriteId, productId: $productId, '
-        'userId: $userId, createdAt: $createdAt)';
-  }
-
-  @override
-  bool operator ==(Object other) {
-    if (identical(this, other)) return true;
-
-    return other is Favorite &&
-        other.favoriteId == favoriteId &&
-        other.productId == productId &&
-        other.userId == userId &&
-        other.createdAt == createdAt;
-  }
-
-  @override
-  int get hashCode {
-    return Object.hash(favoriteId, productId, userId, createdAt);
-  }
-}

lib/features/favorites/domain/repositories/favorites_repository.dart

@@ -0,0 +1,29 @@
+import 'package:worker/features/products/domain/entities/product.dart';
+
+/// Favorites Repository Interface
+///
+/// Defines the contract for favorites data operations.
+/// Implementations should follow the online-first approach:
+/// 1. Try to fetch/update data from API
+/// 2. Update local cache with API response
+/// 3. On network failure, fall back to local cache
+abstract class FavoritesRepository {
+  /// Get favorite products with full product data
+  ///
+  /// Online-first: Fetches from wishlist API, caches locally.
+  /// Falls back to local cache on network failure.
+  /// Returns `List<Product>` with complete product information.
+  Future<List<Product>> getFavoriteProducts();
+
+  /// Add a product to favorites
+  ///
+  /// Online-first: Adds to API, then caches locally.
+  /// On network failure, queues for later sync.
+  Future<void> addFavorite(String productId);
+
+  /// Remove a product from favorites
+  ///
+  /// Online-first: Removes from API, then updates local cache.
+  /// On network failure, queues for later sync.
+  Future<bool> removeFavorite(String productId);
+}