# Products Feature

This feature implements the complete products catalog browsing functionality for the Worker mobile app using clean architecture principles.

## Architecture

The feature follows a clean architecture pattern with three distinct layers:

### Domain Layer (`domain/`)

Pure business logic with no dependencies on Flutter or data sources.

- **Entities** (`entities/`):
  - `Product`: Product business entity with price calculations, stock status, and discount logic
  - `Category`: Product category for filtering

- **Repositories** (`repositories/`):
  - `ProductsRepository`: Abstract interface defining data operations

- **Use Cases** (`usecases/`):
  - `GetProducts`: Retrieve products with optional category filtering
  - `SearchProducts`: Search products by query string
  - `GetCategories`: Retrieve all product categories

### Data Layer (`data/`)

Handles data persistence and retrieval.

- **Models** (`models/`):
  - `ProductModel`: Hive-compatible product data model (Type ID: 20)
  - `CategoryModel`: Hive-compatible category data model (Type ID: 21)

- **Data Sources** (`datasources/`):
  - `ProductsLocalDataSource`: Mock data provider with 10 sample products across 6 categories

- **Repositories** (`repositories/`):
  - `ProductsRepositoryImpl`: Concrete implementation of ProductsRepository

### Presentation Layer (`presentation/`)

UI components and state management.

- **Providers** (`providers/`):
  - `ProductsProvider`: Main provider for filtered products (category + search)
  - `CategoriesProvider`: Categories list provider
  - `SelectedCategoryProvider`: Current selected category state
  - `SearchQueryProvider`: Current search query state
  - `AllProductsProvider`: Unfiltered products provider

- **Pages** (`pages/`):
  - `ProductsPage`: Main products browsing page with search, filters, and grid

- **Widgets** (`widgets/`):
  - `ProductSearchBar`: Search input with clear button
  - `CategoryFilterChips`: Horizontal scrolling category chips
  - `ProductCard`: Product display card with image, price, stock status, and add to cart
  - `ProductGrid`: 2-column responsive grid layout

## Features

### Product Display
- 2-column responsive grid layout
- Product image with caching (cached_network_image)
- Product name, SKU, and price
- Price per unit display (e.g., "450.000đ/m²")
- Sale price with discount badge
- Stock status indicator
- Low stock warning badge
- Add to cart button

### Filtering & Search
- Real-time search across product name, SKU, and description
- Category filtering with 6 categories:
  - Tất cả (All)
  - Gạch lát nền (Floor tiles)
  - Gạch ốp tường (Wall tiles)
  - Gạch trang trí (Decorative tiles)
  - Gạch ngoài trời (Outdoor tiles)
  - Phụ kiện (Accessories)
- Combined search + category filtering

### UI/UX Features
- Pull-to-refresh support
- Loading states with CircularProgressIndicator
- Error states with retry button
- Empty states with helpful messages
- Vietnamese localization
- Material 3 design system
- Responsive layout
- Optimized image caching
- Smooth scrolling performance

## Mock Data

The feature includes 10 sample products:

1. **Gạch men cao cấp 60x60** - Premium glazed tiles (450.000đ/m²)
2. **Gạch granite nhập khẩu** - Imported granite (680.000đ/m², sale: 620.000đ)
3. **Gạch mosaic trang trí** - Decorative mosaic (320.000đ/m²)
4. **Gạch 3D họa tiết** - 3D patterned tiles (750.000đ/m², sale: 680.000đ)
5. **Gạch ceramic chống trượt** - Anti-slip ceramic (380.000đ/m²)
6. **Gạch terrazzo đá mài** - Terrazzo tiles (890.000đ/m², sale: 820.000đ)
7. **Gạch ốp tường bếp** - Kitchen wall tiles (280.000đ/m²)
8. **Gạch sân vườn chống rêu** - Anti-mold garden tiles (420.000đ/m², sale: 380.000đ)
9. **Keo dán gạch chuyên dụng** - Tile adhesive (180.000đ/bao)
10. **Keo chà ron màu** - Colored grout (120.000đ/bao, sale: 99.000đ)

All products include:
- High-quality Unsplash images
- Detailed Vietnamese descriptions
- Brand attribution (Eurotile or Vasta Stone)
- Stock quantities
- Created timestamps

## State Management

The feature uses Riverpod 3.0 with code generation:

```dart
// Watch products (filtered by category and search)
final productsAsync = ref.watch(productsProvider);

// Update search query
ref.read(searchQueryProvider.notifier).updateQuery('gạch men');

// Update selected category
ref.read(selectedCategoryProvider.notifier).updateCategory('floor_tiles');

// Refresh products
await ref.read(productsProvider.notifier).refresh();
```

## Navigation

The products page is registered in the app router:

```dart
context.goProducts(); // Navigate to products page
context.go(RouteNames.products); // Using route name
```

## Dependencies

- `flutter_riverpod`: ^3.0.0 - State management
- `riverpod_annotation`: ^3.0.0 - Code generation
- `hive_ce`: ^2.6.0 - Local database
- `cached_network_image`: ^3.3.1 - Image caching
- `shimmer`: ^3.0.0 - Loading placeholders
- `intl`: ^0.20.0 - Vietnamese number formatting
- `go_router`: ^14.6.2 - Navigation

## Future Enhancements

- [ ] Product detail page
- [ ] Add to cart functionality
- [ ] Cart state management
- [ ] Product favorites/wishlist
- [ ] Advanced filters (price range, brand, etc.)
- [ ] Sort options (price, name, popularity)
- [ ] Load more / pagination
- [ ] Product comparison
- [ ] Recent viewed products
- [ ] Related products recommendations
- [ ] API integration (replace mock data)

## Testing

To run tests for this feature:

```bash
# Unit tests
flutter test test/features/products/domain/
flutter test test/features/products/data/

# Widget tests
flutter test test/features/products/presentation/widgets/

# Integration tests
flutter test integration_test/products_test.dart
```

## Code Generation

After making changes to providers or models, run:

```bash
dart run build_runner build --delete-conflicting-outputs
```

## File Structure

```
lib/features/products/
├── domain/
│   ├── entities/
│   │   ├── product.dart
│   │   └── category.dart
│   ├── repositories/
│   │   └── products_repository.dart
│   └── usecases/
│       ├── get_products.dart
│       ├── search_products.dart
│       └── get_categories.dart
├── data/
│   ├── models/
│   │   ├── product_model.dart
│   │   ├── product_model.g.dart
│   │   ├── category_model.dart
│   │   └── category_model.g.dart
│   ├── datasources/
│   │   └── products_local_datasource.dart
│   └── repositories/
│       └── products_repository_impl.dart
├── presentation/
│   ├── providers/
│   │   ├── products_provider.dart
│   │   ├── products_provider.g.dart
│   │   ├── categories_provider.dart
│   │   ├── categories_provider.g.dart
│   │   ├── selected_category_provider.dart
│   │   ├── selected_category_provider.g.dart
│   │   ├── search_query_provider.dart
│   │   └── search_query_provider.g.dart
│   ├── pages/
│   │   └── products_page.dart
│   └── widgets/
│       ├── product_search_bar.dart
│       ├── category_filter_chips.dart
│       ├── product_card.dart
│       └── product_grid.dart
└── README.md
```

## Usage Example

```dart
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:worker/features/products/presentation/pages/products_page.dart';

// Navigate to products page
void navigateToProducts(BuildContext context) {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (_) => const ProductsPage()),
  );
}

// Or using go_router
context.goProducts();
```

## Contributing

When adding new features to this module:

1. Follow the clean architecture pattern
2. Add domain entities first
3. Implement repository interfaces
4. Create use cases for business logic
5. Add data models with Hive annotations
6. Implement data sources
7. Create Riverpod providers
8. Build UI widgets
9. Update this README
10. Add tests

## License

This feature is part of the Worker Mobile App project.