favorite
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Phuoc Nguyen
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lib/features/favorites/INTEGRATION_SUMMARY.md
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lib/features/favorites/INTEGRATION_SUMMARY.md
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# Favorites Feature - Integration Summary
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## Overview
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A complete favorites state management system for the Worker app using Riverpod 3.0 with code generation and Hive for local persistence.
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---
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## Files Created
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### 1. Data Layer
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**Location**: `/lib/features/favorites/data/datasources/`
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#### `favorites_local_datasource.dart`
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- **Purpose**: Handles all Hive database operations for favorites
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- **Key Methods**:
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- `getAllFavorites(userId)` - Get all favorites for a user
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- `addFavorite(favorite)` - Add a new favorite
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- `removeFavorite(productId, userId)` - Remove a favorite
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- `isFavorite(productId, userId)` - Check favorite status
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- `clearFavorites(userId)` - Clear all favorites for a user
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- `getFavoriteCount(userId)` - Get count of favorites
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- `compact()` - Optimize database size
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- **Features**:
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- Multi-user support (filters by userId)
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- Error handling with try-catch
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- Debug logging
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- Sorted by creation date (newest first)
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---
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### 2. Presentation Layer
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**Location**: `/lib/features/favorites/presentation/providers/`
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#### `favorites_provider.dart`
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- **Purpose**: Riverpod 3.0 state management with code generation
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- **Generated File**: `favorites_provider.g.dart` (auto-generated by build_runner)
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**Providers Created**:
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1. **`favoritesLocalDataSourceProvider`**
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- Type: `Provider<FavoritesLocalDataSource>`
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- Purpose: Dependency injection for datasource
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- Auto-dispose: Yes
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2. **`currentUserIdProvider`**
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- Type: `Provider<String>`
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- Purpose: Provides current logged-in user ID
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- Current Value: `'user_001'` (hardcoded for development)
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- **TODO**: Replace with actual auth provider integration
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- Auto-dispose: Yes
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3. **`favoritesProvider`** (Main Provider)
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- Type: `AsyncNotifier<Set<String>>`
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- Purpose: Manages favorites state (Set of product IDs)
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- Auto-dispose: Yes
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- **Methods**:
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- `addFavorite(productId)` - Add product to favorites
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- `removeFavorite(productId)` - Remove product from favorites
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- `toggleFavorite(productId)` - Toggle favorite status
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- `refresh()` - Reload from database
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- `clearAll()` - Remove all favorites
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4. **`isFavoriteProvider(productId)`** (Family Provider)
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- Type: `Provider<bool>`
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- Purpose: Check if specific product is favorited
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- Returns: `true` if favorited, `false` otherwise
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- Safe during loading/error states (returns `false`)
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- Auto-dispose: Yes
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5. **`favoriteCountProvider`**
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- Type: `Provider<int>`
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- Purpose: Get total count of favorites
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- Returns: Number of favorites (0 if loading/error)
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- Auto-dispose: Yes
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6. **`favoriteProductIdsProvider`**
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- Type: `Provider<List<String>>`
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- Purpose: Get all favorite product IDs as a list
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- Returns: List of product IDs (empty if loading/error)
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- Auto-dispose: Yes
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---
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## State Management Architecture
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### State Flow
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```
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User Action (Add/Remove Favorite)
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↓
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favoritesProvider.notifier.addFavorite(productId)
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↓
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Update Hive Database (FavoritesLocalDataSource)
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↓
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Update In-Memory State (Set<String>)
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↓
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Notify Listeners (UI Rebuilds)
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```
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### Data Persistence
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- **Primary Storage**: Hive (local database)
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- **Box Name**: `favorite_box` (from HiveBoxNames.favoriteBox)
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- **Model**: `FavoriteModel` (Hive TypeId: 28)
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- **Format**:
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```dart
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FavoriteModel(
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favoriteId: "user_001_product_123_1234567890",
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productId: "product_123",
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userId: "user_001",
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createdAt: DateTime.now(),
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)
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```
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### State Type
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- **Type**: `Set<String>` (Product IDs)
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- **Reason**: Set provides O(1) lookup for `.contains()` checks
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- **Alternative**: Could use `List<String>` but Set is more efficient
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---
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## Integration Points
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### ✅ Already Integrated
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1. **Hive Database**
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- Uses existing `HiveBoxNames.favoriteBox`
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- Uses existing `HiveTypeIds.favoriteModel` (28)
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- FavoriteModel already has generated adapter
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2. **Domain Layer**
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- `Favorite` entity: `/lib/features/favorites/domain/entities/favorite.dart`
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- `FavoriteModel`: `/lib/features/favorites/data/models/favorite_model.dart`
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### ⚠️ TODO: Authentication Integration
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Currently using hardcoded userId (`'user_001'`). To integrate with auth:
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1. **Locate Auth Provider** (when available)
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2. **Update `currentUserIdProvider`**:
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```dart
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@riverpod
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String currentUserId(Ref ref) {
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final authState = ref.watch(authProvider);
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return authState.user?.id ?? 'guest';
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}
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```
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3. **Handle Guest Users**:
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- Decide: Should guests have favorites?
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- If yes, use device-specific ID
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- If no, show login prompt when favoriting
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---
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## Usage in Widgets
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### Example 1: Simple Favorite Button
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```dart
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class FavoriteButton extends ConsumerWidget {
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final String productId;
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final isFavorited = ref.watch(isFavoriteProvider(productId));
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return IconButton(
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icon: Icon(isFavorited ? Icons.favorite : Icons.favorite_border),
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onPressed: () {
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ref.read(favoritesProvider.notifier).toggleFavorite(productId);
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},
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);
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}
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}
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```
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### Example 2: Favorites Count Badge
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```dart
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class FavoritesBadge extends ConsumerWidget {
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final count = ref.watch(favoriteCountProvider);
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return Badge(
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label: Text('$count'),
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child: Icon(Icons.favorite),
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);
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}
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}
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```
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### Example 3: Display All Favorites
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```dart
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class FavoritesPage extends ConsumerWidget {
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final favoritesAsync = ref.watch(favoritesProvider);
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return favoritesAsync.when(
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data: (favorites) => ListView.builder(
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itemCount: favorites.length,
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itemBuilder: (context, index) {
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final productId = favorites.elementAt(index);
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return ProductCard(productId: productId);
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},
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),
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loading: () => CircularProgressIndicator(),
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error: (error, stack) => Text('Error: $error'),
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);
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}
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}
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```
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**See `USAGE_EXAMPLES.md` for comprehensive examples.**
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---
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## Testing
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### Unit Test Example
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```dart
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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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void main() {
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test('should add and remove favorites', () async {
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final container = ProviderContainer();
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addTearDown(container.dispose);
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// Add favorite
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await container.read(favoritesProvider.notifier)
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.addFavorite('product_1');
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// Verify added
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final favorites = await container.read(favoritesProvider.future);
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expect(favorites, contains('product_1'));
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// Remove favorite
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await container.read(favoritesProvider.notifier)
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.removeFavorite('product_1');
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// Verify removed
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final updated = await container.read(favoritesProvider.future);
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expect(updated, isNot(contains('product_1')));
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});
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}
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```
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---
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## Error Handling
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### State Management Errors
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- Wrapped in `AsyncValue.error()`
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- UI can handle with `.when()` method
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- Logged to console with debug messages
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### Database Errors
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- Try-catch blocks in datasource methods
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- Rethrow for provider to handle
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- Graceful fallbacks (empty sets, false returns)
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### Edge Cases Handled
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- ✅ Product already favorited (no-op)
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- ✅ Product not in favorites (no-op on remove)
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- ✅ Empty favorites list
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- ✅ Hive box not initialized
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- ✅ Multi-user support (filters by userId)
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---
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## Performance Considerations
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### Optimizations
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1. **Set vs List**: Using `Set<String>` for O(1) lookup
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2. **Auto-dispose**: All providers auto-dispose when not in use
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3. **Selective watching**: `isFavoriteProvider` rebuilds only affected widgets
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4. **Database compaction**: Available via `compact()` method
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5. **Sorted by date**: Favorites returned in newest-first order
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### Potential Improvements
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1. **Batch operations**: Add `addMultipleFavorites()` method
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2. **Caching**: Add in-memory cache layer
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3. **Pagination**: For users with many favorites
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4. **Sync**: Add remote API sync capability
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---
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## Debugging
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### Console Logs
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All operations log to console with prefix `[FavoritesProvider]` or `[FavoritesLocalDataSource]`:
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- "Added favorite: product_123"
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- "Removed favorite: product_123 for user: user_001"
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- "Loaded 5 favorites for user: user_001"
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- "Error adding favorite: ..."
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### Check State
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```dart
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// In widget
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final favorites = ref.read(favoritesProvider);
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print('Favorites state: $favorites');
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// Check if favorited
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final isFav = ref.read(isFavoriteProvider('product_123'));
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print('Is favorited: $isFav');
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```
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---
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## Known Limitations
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1. **No Auth Integration Yet**: Using hardcoded userId
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2. **No Remote Sync**: Only local storage (Hive)
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3. **No Offline Queue**: Changes not synced to backend
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4. **Single Device**: No cross-device synchronization
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5. **No Favorites Limit**: Could grow unbounded
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---
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## Next Steps
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### Immediate Tasks
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1. ✅ ~~Create providers~~ (Complete)
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2. ✅ ~~Create datasource~~ (Complete)
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3. ✅ ~~Generate code~~ (Complete)
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4. ✅ ~~Write documentation~~ (Complete)
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### Future Enhancements
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1. **Auth Integration**
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- Replace `currentUserIdProvider` with real auth
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- Handle login/logout (clear favorites on logout?)
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2. **Remote API**
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- Sync favorites to backend
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- Handle offline changes
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- Implement optimistic updates
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3. **UI Components**
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- Create reusable `FavoriteButton` widget
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- Create `FavoritesPage` screen
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- Add favorites filter to products page
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4. **Analytics**
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- Track favorite actions
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- Analyze favorite patterns
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- Product recommendations based on favorites
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5. **Features**
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- Share favorites list
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- Export favorites
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- Favorite collections/folders
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- Favorite products in cart
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---
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## File Structure
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```
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lib/features/favorites/
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├── data/
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│ ├── datasources/
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│ │ └── favorites_local_datasource.dart ← Created
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│ └── models/
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│ ├── favorite_model.dart ← Existing
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│ └── favorite_model.g.dart ← Generated
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├── domain/
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│ └── entities/
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│ └── favorite.dart ← Existing
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├── presentation/
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│ └── providers/
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│ ├── favorites_provider.dart ← Created
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│ └── favorites_provider.g.dart ← Generated
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├── USAGE_EXAMPLES.md ← Created
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└── INTEGRATION_SUMMARY.md ← This file
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```
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---
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## Quick Start Checklist
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To use favorites in your app:
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- [x] 1. Ensure Hive box is opened in `main.dart`
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```dart
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await Hive.openBox<FavoriteModel>(HiveBoxNames.favoriteBox);
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```
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- [ ] 2. Import provider in your widget
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```dart
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import 'package:worker/features/favorites/presentation/providers/favorites_provider.dart';
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```
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- [ ] 3. Watch provider state
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```dart
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final isFavorited = ref.watch(isFavoriteProvider(productId));
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```
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- [ ] 4. Trigger actions
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```dart
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ref.read(favoritesProvider.notifier).toggleFavorite(productId);
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```
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- [ ] 5. Handle loading/error states
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```dart
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favoritesAsync.when(
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data: (favorites) => ...,
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loading: () => ...,
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error: (error, stack) => ...,
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);
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```
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---
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## Support
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For questions or issues:
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1. Check `USAGE_EXAMPLES.md` for code examples
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2. Review console logs for error messages
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3. Verify Hive box initialization
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4. Check that FavoriteModel adapter is registered
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---
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**Status**: ✅ Ready for integration
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**Version**: 1.0.0
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**Last Updated**: 2024-10-24
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