worker/RIVERPOD_SUMMARY.md

# Riverpod 3.0 Setup Summary - Worker Flutter App

## ✅ Setup Complete!

Riverpod 3.0 with code generation has been successfully configured for the Worker Flutter app.

## What Was Configured

### 1. Dependencies Updated (pubspec.yaml)

**Production:**
- `flutter_riverpod: ^3.0.0` - Core Riverpod package for Flutter
- `riverpod_annotation: ^3.0.0` - Annotations for code generation

**Development:**
- `build_runner: ^2.4.11` - Code generation engine
- `riverpod_generator: ^3.0.0` - Generates provider code
- `riverpod_lint: ^3.0.0` - Riverpod-specific linting
- `custom_lint: ^0.8.0` - Required for riverpod_lint

### 2. Build Configuration (build.yaml)

✅ Configured to auto-generate code for:
- `**_provider.dart` files
- `**/providers/*.dart` directories
- `**/notifiers/*.dart` directories

### 3. Linting (analysis_options.yaml)

✅ Enabled custom_lint with Riverpod rules:
- `provider_dependencies` - Proper dependency tracking
- `avoid_ref_read_inside_build` - Performance optimization
- `avoid_public_notifier_properties` - Encapsulation
- `functional_ref` - Proper ref usage
- `notifier_build` - Correct Notifier implementation
- And more...

### 4. App Initialization (main.dart)

✅ Wrapped with ProviderScope:
```dart
void main() {
  runApp(
    const ProviderScope(
      child: MyApp(),
    ),
  );
}
```

### 5. Core Providers Created

#### **connectivity_provider.dart** - Network Monitoring

Four providers for connectivity management:

1. **connectivityProvider** - Connectivity instance
2. **connectivityStreamProvider** - Real-time connectivity stream
3. **currentConnectivityProvider** - One-time connectivity check
4. **isOnlineProvider** - Boolean online/offline stream

**Usage Example:**
```dart
class MyWidget extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final connectivityState = ref.watch(connectivityStreamProvider);

    return connectivityState.when(
      data: (status) {
        if (status == ConnectivityStatus.offline) {
          return OfflineBanner();
        }
        return OnlineContent();
      },
      loading: () => CircularProgressIndicator(),
      error: (error, _) => ErrorView(error),
    );
  }
}
```

#### **provider_examples.dart** - Comprehensive Examples

Complete examples of all Riverpod 3.0 patterns:
- ✅ Simple providers (immutable values)
- ✅ Async providers (FutureProvider pattern)
- ✅ Stream providers
- ✅ Notifier (mutable state with methods)
- ✅ AsyncNotifier (async mutable state)
- ✅ StreamNotifier (stream mutable state)
- ✅ Family (parameters as function arguments)
- ✅ Provider composition
- ✅ AutoDispose vs KeepAlive
- ✅ Lifecycle hooks
- ✅ Error handling with AsyncValue.guard()
- ✅ ref.mounted checks
- ✅ Invalidation and refresh

### 6. Documentation

✅ **RIVERPOD_SETUP.md** - Complete setup guide with:
- Installation instructions
- Code generation commands
- Usage patterns and examples
- Testing strategies
- Migration guide from Riverpod 2.x
- Common issues and solutions

✅ **lib/core/providers/README.md** - Provider architecture documentation

✅ **scripts/setup_riverpod.sh** - Automated setup script

## Directory Structure

```
lib/core/providers/
├── connectivity_provider.dart       # Network monitoring provider
├── connectivity_provider.g.dart     # ✅ Generated code
├── provider_examples.dart           # All Riverpod 3.0 patterns
├── provider_examples.g.dart         # ✅ Generated code
└── README.md                        # Architecture docs

scripts/
└── setup_riverpod.sh                # Automated setup script

Root files:
├── build.yaml                       # Build configuration
├── analysis_options.yaml            # Linting configuration
├── RIVERPOD_SETUP.md               # Complete guide
└── RIVERPOD_SUMMARY.md             # This file
```

## ✅ Verification

All code generation completed successfully:
- ✅ connectivity_provider.g.dart generated
- ✅ provider_examples.g.dart generated
- ✅ No Riverpod-related errors in flutter analyze
- ✅ Dependencies installed
- ✅ ProviderScope configured

## Quick Commands

### Install Dependencies
```bash
flutter pub get
```

### Generate Provider Code
```bash
# One-time generation
dart run build_runner build --delete-conflicting-outputs

# Watch mode (recommended during development)
dart run build_runner watch -d

# Clean and rebuild
dart run build_runner clean && dart run build_runner build --delete-conflicting-outputs
```

### Run Linting
```bash
# Check for Riverpod issues
dart run custom_lint

# Auto-fix issues
dart run custom_lint --fix
```

### Analyze Code
```bash
flutter analyze
```

### Use Setup Script
```bash
./scripts/setup_riverpod.sh
```

## Riverpod 3.0 Key Features

### 1. @riverpod Annotation
```dart
import 'package:riverpod_annotation/riverpod_annotation.dart';

part 'my_provider.g.dart';

@riverpod
String myValue(MyValueRef ref) => 'Hello';
```

### 2. Family as Function Parameters
```dart
@riverpod
Future<User> user(UserRef ref, String userId) async {
  return await fetchUser(userId);
}

// Usage
ref.watch(userProvider('user123'));
```

### 3. Notifier for Mutable State
```dart
@riverpod
class Counter extends _$Counter {
  @override
  int build() => 0;

  void increment() => state++;
}

// Usage
ref.watch(counterProvider);                    // Get state
ref.read(counterProvider.notifier).increment(); // Call method
```

### 4. AsyncNotifier for Async Mutable State
```dart
@riverpod
class UserProfile extends _$UserProfile {
  @override
  Future<User> build() async => await fetchUser();

  Future<void> update(String name) async {
    state = const AsyncValue.loading();
    state = await AsyncValue.guard(() async {
      return await updateUser(name);
    });
  }
}
```

### 5. Unified Ref Type
```dart
// All providers use the same Ref type
@riverpod
Future<String> example(ExampleRef ref) async {
  ref.watch(provider1);
  ref.read(provider2);
  ref.listen(provider3, (prev, next) {});
}
```

### 6. ref.mounted Check
```dart
@riverpod
class Example extends _$Example {
  @override
  String build() => 'Initial';

  Future<void> update() async {
    await Future.delayed(Duration(seconds: 2));

    // Check if still mounted
    if (!ref.mounted) return;

    state = 'Updated';
  }
}
```

## Usage in Widgets

### ConsumerWidget
```dart
class MyWidget extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final value = ref.watch(myProvider);
    return Text(value);
  }
}
```

### ConsumerStatefulWidget
```dart
class MyWidget extends ConsumerStatefulWidget {
  @override
  ConsumerState<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends ConsumerState<MyWidget> {
  @override
  Widget build(BuildContext context) {
    final value = ref.watch(myProvider);
    return Text(value);
  }
}
```

### Consumer (for optimization)
```dart
Consumer(
  builder: (context, ref, child) {
    final count = ref.watch(counterProvider);
    return Text('$count');
  },
)
```

## Best Practices

### ✅ DO

1. **Use .select() for optimization**
   ```dart
   final name = ref.watch(userProvider.select((user) => user.name));
   ```

2. **Use AsyncValue.guard() for error handling**
   ```dart
   state = await AsyncValue.guard(() async {
     return await api.call();
   });
   ```

3. **Check ref.mounted after async operations**
   ```dart
   await Future.delayed(Duration(seconds: 1));
   if (!ref.mounted) return;
   state = newValue;
   ```

4. **Use autoDispose by default**
   ```dart
   @riverpod  // autoDispose by default
   String example(ExampleRef ref) => 'value';
   ```

5. **Keep providers in dedicated directories**
   ```
   lib/features/auth/presentation/providers/
   lib/features/products/presentation/providers/
   ```

### ❌ DON'T

1. **Don't use ref.read() in build methods**
   ```dart
   // BAD
   Widget build(BuildContext context, WidgetRef ref) {
     final value = ref.read(myProvider);  // ❌
     return Text(value);
   }

   // GOOD
   Widget build(BuildContext context, WidgetRef ref) {
     final value = ref.watch(myProvider);  // ✅
     return Text(value);
   }
   ```

2. **Don't use StateNotifierProvider** (deprecated in Riverpod 3.0)
   ```dart
   // Use Notifier instead
   @riverpod
   class Counter extends _$Counter {
     @override
     int build() => 0;
     void increment() => state++;
   }
   ```

3. **Don't forget the part directive**
   ```dart
   // Required!
   part 'my_provider.g.dart';
   ```

## Next Steps

### 1. For Feature Development

Create providers in feature-specific directories:

```
lib/features/auth/presentation/providers/
  ├── auth_provider.dart
  ├── auth_provider.g.dart          # Generated
  ├── login_form_provider.dart
  └── login_form_provider.g.dart    # Generated
```

### 2. Provider Template

```dart
import 'package:riverpod_annotation/riverpod_annotation.dart';

part 'my_provider.g.dart';

@riverpod
class MyFeature extends _$MyFeature {
  @override
  MyState build() {
    // Initialize
    return MyState.initial();
  }

  void updateState() {
    // Modify state
    state = state.copyWith(/* ... */);
  }
}
```

### 3. Run Code Generation

After creating a provider:
```bash
dart run build_runner watch -d
```

### 4. Use in Widgets

```dart
class MyScreen extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final state = ref.watch(myFeatureProvider);

    return Column(
      children: [
        Text(state.value),
        ElevatedButton(
          onPressed: () {
            ref.read(myFeatureProvider.notifier).updateState();
          },
          child: Text('Update'),
        ),
      ],
    );
  }
}
```

## Testing

### Unit Test Example
```dart
test('counter increments', () {
  final container = ProviderContainer();
  addTearDown(container.dispose);

  expect(container.read(counterProvider), 0);
  container.read(counterProvider.notifier).increment();
  expect(container.read(counterProvider), 1);
});
```

### Widget Test Example
```dart
testWidgets('displays user name', (tester) async {
  await tester.pumpWidget(
    ProviderScope(
      overrides: [
        userProvider.overrideWith((ref) => User(name: 'Test')),
      ],
      child: MaterialApp(home: UserScreen()),
    ),
  );

  expect(find.text('Test'), findsOneWidget);
});
```

## Examples Reference

All Riverpod 3.0 patterns are documented with working examples in:
📄 **lib/core/providers/provider_examples.dart**

This file includes:
- ✅ 11 different provider patterns
- ✅ Real code examples (not pseudocode)
- ✅ Detailed comments explaining each pattern
- ✅ Usage examples in comments
- ✅ Migration notes from Riverpod 2.x

## Connectivity Provider

The connectivity provider is a real-world example showing:
- ✅ Simple provider (Connectivity instance)
- ✅ Stream provider (connectivity changes)
- ✅ Future provider (one-time check)
- ✅ Derived provider (isOnline boolean)
- ✅ Proper documentation
- ✅ Usage examples

Use it as a template for creating your own providers!

## Resources

- 📚 [Riverpod Documentation](https://riverpod.dev)
- 📚 [Code Generation Guide](https://riverpod.dev/docs/concepts/about_code_generation)
- 📚 [Migration Guide](https://riverpod.dev/docs/migration/from_state_notifier)
- 📄 [Provider Examples](./lib/core/providers/provider_examples.dart)
- 📄 [Connectivity Provider](./lib/core/providers/connectivity_provider.dart)
- 📄 [Complete Setup Guide](./RIVERPOD_SETUP.md)

## Support & Help

If you encounter issues:

1. **Check examples** in provider_examples.dart
2. **Review documentation** in RIVERPOD_SETUP.md
3. **Run linting** with `dart run custom_lint`
4. **Check generated files** (*.g.dart) exist
5. **Verify part directive** is present in provider files
6. **Ensure ProviderScope** wraps the app in main.dart

## Common Issues & Solutions

### Issue: "Target of URI doesn't exist"
**Solution:** Run code generation:
```bash
dart run build_runner build --delete-conflicting-outputs
```

### Issue: "Classes can only mix in mixins"
**Solution:** Make sure the part directive is correct:
```dart
part 'my_provider.g.dart';  // Must match filename
```

### Issue: Provider not updating
**Solution:** Use ref.watch() in build, ref.read() in callbacks

### Issue: Too many rebuilds
**Solution:** Use .select() to watch specific fields

## Conclusion

✅ Riverpod 3.0 with code generation is fully configured and ready to use!

**Key Benefits:**
- ✅ Type-safe state management
- ✅ Less boilerplate with code generation
- ✅ Automatic provider type selection
- ✅ Better hot-reload support
- ✅ Comprehensive linting
- ✅ Excellent documentation

**You can now:**
1. Create providers using @riverpod annotation
2. Use connectivity monitoring immediately
3. Reference provider_examples.dart for patterns
4. Start building feature-specific providers
5. Test providers with ProviderContainer

**Happy coding! 🚀**