# Eatvio - Nutrition & Diet Management Application

## Project Overview

Eatvio is a comprehensive mobile application connecting users with nutrition consultants, providing diet planning tools, recipes, food diary tracking, and professional consultation services. The application is specifically designed for Russian-speaking users interested in nutrition and healthy eating.

### Core Features
- **Blog Posts**: Educational nutrition content and articles
- **Nutrition Consultation**: Professional consultation services with certified nutritionists
- **Recipes**: User-generated and professional recipes with nutritional information
- **Diets**: Structured diet plans with daily schedules
- **Nutrition Plans**: Long-term nutrition planning and tracking

### Target Audience
- **Primary**: Russian-speaking users interested in nutrition and healthy eating
- **Secondary**: Certified nutrition consultants offering professional services
- **Market**: Russian Federation and Russian-speaking countries

### Business Model
- Paid consultations with nutritionists
- Content marketplace for premium diets and plans
- Subscription-based features for consultants

### Platform Information
- **Mobile**: iOS and Android (including Huawei devices)
- **Language**: Russian (ru)
- **Current Version**: 1.3.0+79 (build 79)

## Prerequisites

### Flutter & Dart Versions
- **Flutter**: SDK 3.8.0+
- **Dart**: Language version >=3.8.0 <4.0.0

### Platform-Specific Requirements

#### Android
- **NDK Version**: 27.0.12077973
- **Huawei HMS Dependencies**:
  - Huawei Push (6.12.0.300)
  - Huawei Analytics (6.12.0.300)
- **Google Play Services**
- **ProGuard** for code obfuscation
- **Compile SDK**: Flutter default
- **Min SDK**: Flutter default
- **Target SDK**: Flutter default

#### iOS
- **APNs** for push notifications
- **Deep linking** configuration
- **Xcode** version compatible with Flutter requirements

#### General IDE Requirements
- **VS Code** with Flutter/Dart extensions
- **Android Studio** with Flutter plugin
- **Visual Studio Code** recommended for development

## Environment Configuration

### .env Setup Process

1. Copy the environment template:
   ```bash
   cp env.example .env
   ```

2. Edit the `.env` file with your configuration values

### Required Environment Variables

#### API URLs
- `BASE_URL` - основной URL API (по умолчанию: https://eatvio.ru)
- `DEV_BASE_URL` - URL API для разработки (по умолчанию: https://dev2.eatvio.com)

#### Sentry Configuration
- `SENTRY_DSN` - DSN для Sentry мониторинга

#### Firebase Configuration
- `FIREBASE_PROJECT_ID` - ID проекта Firebase
- `FIREBASE_DATABASE_URL` - URL базы данных Firebase
- `FIREBASE_STORAGE_BUCKET` - bucket для хранения файлов
- `FIREBASE_MESSAGING_SENDER_ID` - ID отправителя сообщений

#### Firebase Android Configuration
- `FIREBASE_ANDROID_API_KEY` - API ключ для Android
- `FIREBASE_ANDROID_APP_ID` - ID приложения для Android

#### Firebase iOS Configuration
- `FIREBASE_IOS_API_KEY` - API ключ для iOS
- `FIREBASE_IOS_APP_ID` - ID приложения для iOS
- `FIREBASE_IOS_BUNDLE_ID` - Bundle ID для iOS

#### App Store URLs
- `APP_STORE_URL` - URL App Store
- `RUSTORE_URL` - URL RuStore

#### Support URLs
- `TELEGRAM_SUPPORT_URL` - URL поддержки в Telegram
- `SUPPORT_EMAIL` - email для поддержки

#### Test Credentials (только для разработки)
- `TEST_EMAIL` - тестовый email
- `TEST_PASSWORD` - тестовый пароль

#### Email Validation API
- `EMAIL_VALIDATION_API_URL` - URL API для валидации email

#### Connection Check URLs
- `GOOGLE_CHECK_URL` - URL для проверки соединения (Google)
- `YANDEX_CHECK_URL` - URL для проверки соединения (Yandex)

#### VK ID Configuration
- `VK_CLIENT_ID` - ID приложения VK (числовой)
- **Примечание**: VK_CLIENT_ID - это числовой "ID приложения" из консоли VK ID, НЕ "Защищённый ключ" или "Сервисный ключ доступа"

#### Yandex ID Configuration
- `YANDEX_CLIENT_ID` - ID приложения Yandex OAuth
- `YANDEX_CLIENT_SECRET` - секретный ключ приложения Yandex OAuth
- `YANDEX_REDIRECT_URI` - URI для перенаправления (должен совпадать с настройками в Yandex OAuth приложении)

## Technology Stack

### Core Framework
- **Flutter**: SDK 3.8.0+
- **Dart**: Language version >=3.8.0 <4.0.0
- **Version**: 1.3.0+79 (build 79)

### State Management
- **flutter_bloc**: ^9.1.1 - BLoC pattern implementation
- **equatable**: ^2.0.7 - Value equality for state objects

### Data Management
- **freezed**: ^3.2.0 - Immutable data classes
- **freezed_annotation**: ^3.1.0 - Code generation annotations
- **json_annotation**: ^4.9.0 - JSON serialization
- **json_serializable**: ^6.10.0 - JSON code generation

### Networking
- **dio**: ^5.9.0 - HTTP client
- **retrofit**: ^4.7.1 - Type-safe REST client
- **retrofit_generator**: ^10.0.2 - Retrofit code generation
- **http**: ^1.5.0 - Additional HTTP support
- **http_parser**: ^4.1.2 - HTTP parsing utilities

### Real-time Communication
- **dart_pusher_channels**: ^1.2.3 - WebSocket support via Pusher
- **connectivity_plus**: ^6.1.5 - Network connectivity monitoring

### Navigation & Routing
- **go_router**: ^16.1.0 - Declarative routing
- Deep linking support for content

### UI Components
- **cached_network_image**: ^3.4.1 - Image caching
- **flutter_svg**: ^2.2.0 - SVG rendering
- **google_fonts**: ^6.3.0 - Mulish font family
- **carousel_slider_plus**: ^7.1.1 - Carousel widgets
- **photo_view**: ^0.15.0 - Image viewer
- **dismissible_page**: ^1.0.2 - Swipe to dismiss
- **badges**: ^3.1.2 - Notification badges
- **lottie**: ^3.3.1 - Animation support
- **flutter_portal**: ^1.1.4 - Overlay widgets
- **dotted_border**: ^3.1.0 - Dotted borders
- **flutter_rating_bar**: ^4.0.1 - Rating widgets

### Forms & Input
- **flutter_form_builder**: ^10.2.0 - Form management
- **validators**: ^3.0.0 - Input validation
- **flutter_typeahead**: ^5.2.0 - Autocomplete
- **keyboard_dismisser**: ^3.0.0 - Keyboard management
- **flutter_keyboard_visibility**: ^6.0.0 - Keyboard state
- **mask_text_input_formatter**: ^2.9.0 - Input masking

### Media & Files
- **image_picker**: ^1.2.0 - Image selection
- **flutter_image_compress**: ^2.4.0 - Image compression
- **image**: ^4.5.4 - Image manipulation
- **file_picker**: ^10.3.1 - File selection
- **audioplayers**: ^6.5.0 - Audio playback
- **qr_code_scanner_plus**: ^2.0.10+1 - QR code scanning

### Data Visualization
- **syncfusion_flutter_charts**: ^30.2.5 - Chart widgets
- **syncfusion_flutter_gauges**: ^30.2.5 - Gauge widgets
- **table_calendar**: ^3.2.0 - Calendar widget

### Storage & Persistence
- **shared_preferences**: ^2.5.3 - Local key-value storage
- **path_provider**: ^2.1.5 - File system paths
- **path**: ^1.9.1 - Path manipulation

### Firebase
- **firebase_core**: ^4.0.0 - Firebase initialization
- **firebase_messaging**: ^16.0.0 - Push notifications

### Analytics & Monitoring
- **sentry_flutter**: ^9.6.0 - Error tracking
- **appmetrica_plugin**: ^3.3.0 - Analytics (Russian market)

### Authentication
- **vk_id**: ^1.0.3 - VK social login
- **flutter_login_yandex**: ^0.0.5 - Yandex ID login
- OAuth support for OK and Mail.ru

### Utilities
- **url_launcher**: ^6.3.2 - URL handling
- **easy_debounce**: ^2.0.3 - Debouncing
- **share_plus**: ^11.1.0 - Content sharing
- **flutter_html**: ^3.0.0 - HTML rendering
- **webview_flutter**: ^4.13.0 - WebView
- **intl**: ^0.20.2 - Internationalization
- **collection**: ^1.19.1 - Collection utilities
- **uuid**: ^4.5.1 - UUID generation
- **visibility_detector**: ^0.4.0+2 - Visibility tracking
- **fluttertoast**: ^8.2.12 - Toast messages
- **version**: ^3.0.2 - Version management
- **package_info_plus**: ^8.3.1 - Package info
- **device_info_plus**: ^11.5.0 - Device information
- **permission_handler**: ^12.0.1 - Permissions

## Development Workflow

### Code Generation
- Run `flutter pub run build_runner build` for code generation
- Run `flutter pub run build_runner build --delete-conflicting-outputs` for clean generation
- Use `flutter pub run build_runner watch` for watch mode

### Environment Setup
- Configure `.env` file with all required variables
- Set up Firebase for both Android and iOS platforms
- Configure social authentication providers (VK, Yandex, etc.)

### Testing
- Unit tests with `flutter_test`
- Integration tests with `integration_test`
- Mocking with `mockito`

## Build Commands

### Development Builds
```bash
# Run on connected device
flutter run

# Run on specific Android device
flutter run -d emulator-5554

# Run on specific iOS simulator
flutter run -d iPhone\ 15
```

### Production Builds

#### Android
```bash
# Build APK (split by ABI)
flutter build apk --release --split-per-abi

# Build App Bundle
flutter build appbundle --release

# Huawei-specific build (with HMS)
flutter build apk --release --flavor production --target-platform android-arm64
```

#### iOS
```bash
# Build IPA for TestFlight
flutter build ipa --export-options-plist=ExportOptions.plist

# Build for specific device architecture
flutter build ipa --export-options-plist=ExportOptions.plist --no-codesign
```

## Optimization Techniques

### Android Build Optimization
1. **ProGuard Rules**:
   - Configure rules in [`android/app/proguard-rules.pro`](android/app/proguard-rules.pro:1)
   - Essential rules for Flutter:
     ```
     -keep class io.flutter.app.** { *; }
     -keep class io.flutter.plugin.**  { *; }
     -keep class io.flutter.util.**  { *; }
     -keep class io.flutter.view.**  { *; }
     ```

2. **Resource Shrinking**:
   - Enabled in `android/app/build.gradle`:
     ```gradle
     buildTypes {
         release {
             shrinkResources true
             minifyEnabled true
         }
     }
     ```

3. **Code Obfuscation**:
   - Use `--obfuscate` flag with build commands
   - Verify with `flutter build apk --release --obfuscate --split-debug-info=debug-info/`

4. **Image Compression Workflow**:
   - Automatic compression via [`flutter_image_compress`](lib/features/create_diet/models/create_diet_model.dart:1)
   - Configuration in image upload flows:
     ```dart
     final compressedFile = await FlutterImageCompress.compressWithFile(
       file.path,
       quality: 85,
       minWidth: 1024,
       minHeight: 1024,
     );
     ```

## Troubleshooting

### Common Issues

#### Missing .env Variables
- **Symptom**: Application crashes on startup with "Missing environment variable" error
- **Solution**: 
  1. Verify `.env` file exists in project root
  2. Check [`ENV_SETUP.md`](ENV_SETUP.md) for required variables
  3. Regenerate configuration with `flutter clean && flutter pub get`

#### Firebase Configuration Errors
- **Android**:
  - Missing `google-services.json` in `android/app/`
  - Missing `agconnect-services.json` for Huawei devices
  - Verify SHA-1 fingerprints match Firebase console
- **iOS**:
  - Missing `GoogleService-Info.plist` in `ios/Runner`
  - Check bundle identifier matches Firebase project

#### WebSocket Connection Failures
- **Symptoms**: Chat messages not delivering, real-time updates not working
- **Solutions**:
  1. Verify Pusher configuration in [`lib/core/websockets/ws_manager.dart`](lib/core/websockets/ws_manager.dart:1)
  2. Check network connectivity with `connectivity_plus` package
  3. Ensure proper authentication token is sent with WebSocket connection

#### Platform-Specific Build Errors
- **Huawei vs Google Services**:
  - For Huawei devices, ensure `agconnect-services.json` is present
  - Use `--flavor` flag to specify build variant:
    ```bash
    flutter build apk --release --flavor hms
    ```
  - Check for conflicting dependencies between HMS and GMS

- **iOS Code Signing Issues**:
  - Verify `ExportOptions.plist` contains correct provisioning profiles
  - Update signing certificates in Xcode
  - Clean build folder: `flutter clean && rm -rf ios/Pods ios/Podfile.lock`

## Key Implementation Details

### Content View Tracking
- `ViewsCubit` handles visibility detection
- `VisibilityDetector` widget tracks on-screen time
- Views sent to backend when 50%+ visible for 2+ seconds
- Debounced to prevent excessive API calls

### Image Handling
- `ImagePicker` for selection
- `FlutterImageCompress` for compression
- MultiPart form data upload via Dio
- Preview via `CachedNetworkImage`

### Search Implementation
- Debounced search with 500ms delay
- Min query length: 3 characters
- Applied to: Feed, Recipes, Diets, Plans, Consultants
- Tag-based filtering for recipes

### Pagination Pattern
- Page-based pagination
- Scroll detection for next page load
- Loading state during fetch
- Meta data tracking (current page, last page)

## Security Considerations

### Authentication
- Bearer token authentication
- Secure token storage
- Automatic session management
- OAuth 2.0 for social login

### Data Protection
- HTTPS only communication
- Token encryption in storage
- Secure WebSocket connections
- Privacy policy compliance

## Key Files Reference

### Entry Point
- `lib/main.dart` - App initialization

### Core Infrastructure
- `lib/core/app_initializer.dart` - Startup sequence
- `lib/core/locator_service.dart` - DI container
- `lib/core/app_config.dart` - App configuration
- `lib/core/app_router.dart` - Routing setup

### WebSocket
- `lib/core/websockets/ws_manager.dart` - Connection management
- `lib/core/websockets/ws_service.dart` - API service

### Authentication
- `lib/features/auth/sdk/social_auth_facade.dart` - Social auth
- `lib/core/token_storage.dart` - Token persistence
- `lib/core/interceptors/token_interceptor.dart` - Auth interceptor

### Environment
- `lib/core/env_config.dart` - Environment variables
- `.env` - Environment file (not in repo)

## Key Success Metrics

- User engagement with food diary
- Consultation bookings and completion rates
- Content creation by consultants
- User retention and progress tracking

## Documentation Standards

- **Last Updated**: 2025-10-16
- All paths are relative to `/home/apoloz/dev/eatvio_app`
- Russian market focus maintained throughout documentation
- Version compatibility matrix:
  | Component | Version | Notes |
  |-----------|---------|-------|
  | Flutter | 3.8.0+ | Required |
  | Dart | 3.8.0-3.9.9 | Required |
  | Android SDK | 34 | Target SDK |
  | iOS Deployment | 14.0 | Minimum |

## Ubuntu Development PC Optimization
 ```bash
-# apt install linux-oem-24.04
-# sudo apt-get install --install-recommends linux-lowlatency-hwe-24.04
```
----
- ubuntu switch to hwe [kernel](https://canonical-kernel-docs.readthedocs-hosted.com/latest/reference/hwe-kernels/#installing-a-hwe-kernel)
----
- ubuntu instal intel iRIS gpu [drivers](https://dgpu-docs.intel.com/driver/client/overview.html#ubuntu-latest)
```