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RIVERPOD_DI_MIGRATION.md

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+# Riverpod Dependency Injection Migration
+
+**Date**: October 10, 2025
+**Status**: ✅ **COMPLETE**
+
+---
+
+## Problem
+
+The authentication system was trying to use GetIt for dependency injection, causing the following error:
+
+```
+Bad state: GetIt: Object/factory with type AuthRepository is not registered inside GetIt.
+```
+
+Additionally, there was a circular dependency error in the auth provider:
+
+```
+Bad state: Tried to read the state of an uninitialized provider.
+This generally means that have a circular dependency, and your provider end-up depending on itself.
+```
+
+---
+
+## Solution
+
+Migrated from GetIt to **pure Riverpod dependency injection**. All dependencies are now managed through Riverpod providers.
+
+---
+
+## Changes Made
+
+### 1. Updated Auth Provider (`lib/features/auth/presentation/providers/auth_provider.dart`)
+
+**Before:**
+```dart
+import '../../../../core/di/injection_container.dart';
+
+@riverpod
+AuthRepository authRepository(Ref ref) {
+  return sl<AuthRepository>();  // Using GetIt
+}
+
+@riverpod
+class Auth extends _$Auth {
+  @override
+  AuthState build() {
+    _checkAuthStatus();  // Circular dependency - calling async in build
+    return const AuthState();
+  }
+}
+```
+
+**After:**
+```dart
+import '../../../../core/network/dio_client.dart';
+import '../../../../core/storage/secure_storage.dart';
+import '../../data/datasources/auth_remote_datasource.dart';
+import '../../data/repositories/auth_repository_impl.dart';
+
+/// Provider for DioClient (singleton)
+@Riverpod(keepAlive: true)
+DioClient dioClient(Ref ref) {
+  return DioClient();
+}
+
+/// Provider for SecureStorage (singleton)
+@Riverpod(keepAlive: true)
+SecureStorage secureStorage(Ref ref) {
+  return SecureStorage();
+}
+
+/// Provider for AuthRemoteDataSource
+@Riverpod(keepAlive: true)
+AuthRemoteDataSource authRemoteDataSource(Ref ref) {
+  final dioClient = ref.watch(dioClientProvider);
+  return AuthRemoteDataSourceImpl(dioClient: dioClient);
+}
+
+/// Provider for AuthRepository
+@Riverpod(keepAlive: true)
+AuthRepository authRepository(Ref ref) {
+  final remoteDataSource = ref.watch(authRemoteDataSourceProvider);
+  final secureStorage = ref.watch(secureStorageProvider);
+  final dioClient = ref.watch(dioClientProvider);
+
+  return AuthRepositoryImpl(
+    remoteDataSource: remoteDataSource,
+    secureStorage: secureStorage,
+    dioClient: dioClient,
+  );
+}
+
+@riverpod
+class Auth extends _$Auth {
+  @override
+  AuthState build() {
+    // Don't call async operations in build
+    return const AuthState();
+  }
+
+  /// Initialize auth state - call this on app start
+  Future<void> initialize() async {
+    // Auth initialization logic moved here
+  }
+}
+```
+
+### 2. Removed GetIt Setup (`lib/main.dart`)
+
+**Before:**
+```dart
+import 'core/di/service_locator.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await Hive.initFlutter();
+
+  // Setup dependency injection
+  await setupServiceLocator();  // GetIt initialization
+
+  runApp(const ProviderScope(child: RetailApp()));
+}
+```
+
+**After:**
+```dart
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await Hive.initFlutter();
+
+  // Run the app with Riverpod (no GetIt needed - using Riverpod for DI)
+  runApp(const ProviderScope(child: RetailApp()));
+}
+```
+
+### 3. Initialize Auth State on App Start (`lib/app.dart`)
+
+**Before:**
+```dart
+class RetailApp extends ConsumerWidget {
+  const RetailApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    return MaterialApp(/* ... */);
+  }
+}
+```
+
+**After:**
+```dart
+class RetailApp extends ConsumerStatefulWidget {
+  const RetailApp({super.key});
+
+  @override
+  ConsumerState<RetailApp> createState() => _RetailAppState();
+}
+
+class _RetailAppState extends ConsumerState<RetailApp> {
+  @override
+  void initState() {
+    super.initState();
+    // Initialize auth state on app start
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      ref.read(authProvider.notifier).initialize();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(/* ... */);
+  }
+}
+```
+
+---
+
+## Dependency Injection Architecture
+
+### Provider Hierarchy
+
+```
+DioClient (singleton)
+    ↓
+SecureStorage (singleton)
+    ↓
+AuthRemoteDataSource (uses DioClient)
+    ↓
+AuthRepository (uses AuthRemoteDataSource, SecureStorage, DioClient)
+    ↓
+Auth State Notifier (uses AuthRepository)
+```
+
+### Provider Usage
+
+```dart
+// Access DioClient
+final dioClient = ref.read(dioClientProvider);
+
+// Access SecureStorage
+final secureStorage = ref.read(secureStorageProvider);
+
+// Access AuthRepository
+final authRepository = ref.read(authRepositoryProvider);
+
+// Access Auth State
+final authState = ref.watch(authProvider);
+
+// Call Auth Methods
+await ref.read(authProvider.notifier).login(email: '...', password: '...');
+await ref.read(authProvider.notifier).logout();
+```
+
+---
+
+## Benefits of Riverpod DI
+
+1. **No Manual Registration**: Providers are automatically available
+2. **Type Safety**: Compile-time type checking
+3. **Dependency Graph**: Riverpod manages dependencies automatically
+4. **Testability**: Easy to override providers in tests
+5. **Code Generation**: Auto-generates provider code
+6. **No Circular Dependencies**: Proper lifecycle management
+7. **Singleton Management**: Use `keepAlive: true` for singletons
+
+---
+
+## GetIt Files (Now Unused)
+
+These files are no longer needed but kept for reference:
+
+- `lib/core/di/service_locator.dart` - Old GetIt setup
+- `lib/core/di/injection_container.dart` - Old GetIt container
+
+You can safely delete these files if GetIt is not used anywhere else in the project.
+
+---
+
+## Migration Checklist
+
+- [x] Create Riverpod providers for DioClient
+- [x] Create Riverpod providers for SecureStorage
+- [x] Create Riverpod providers for AuthRemoteDataSource
+- [x] Create Riverpod providers for AuthRepository
+- [x] Remove GetIt references from auth_provider.dart
+- [x] Fix circular dependency in Auth.build()
+- [x] Remove GetIt setup from main.dart
+- [x] Initialize auth state in app.dart
+- [x] Regenerate code with build_runner
+- [x] Test compilation (0 errors)
+
+---
+
+## Build Status
+
+```
+✅ Errors: 0
+✅ Warnings: 61 (info-level only)
+✅ Build: SUCCESS
+✅ Code Generation: COMPLETE
+```
+
+---
+
+## Testing the App
+
+1. **Run the app**:
+   ```bash
+   flutter run
+   ```
+
+2. **Expected behavior**:
+   - App starts and shows login page (if not authenticated)
+   - Login with valid credentials
+   - Token is saved and added to Dio headers automatically
+   - Navigate to Settings to see user profile
+   - Logout button works correctly
+   - After logout, back to login page
+
+---
+
+## Key Takeaways
+
+1. **Riverpod providers replace GetIt** for dependency injection
+2. **Use `keepAlive: true`** for singleton providers (DioClient, SecureStorage)
+3. **Never call async operations in `build()`** - use separate initialization methods
+4. **Initialize auth state in app.dart** using `addPostFrameCallback`
+5. **All dependencies are managed through providers** - no manual registration needed
+
+---
+
+## Next Steps (Optional)
+
+If you want to further clean up:
+
+1. Delete unused GetIt files:
+   ```bash
+   rm lib/core/di/service_locator.dart
+   rm lib/core/di/injection_container.dart
+   ```
+
+2. Remove GetIt from dependencies in `pubspec.yaml`:
+   ```yaml
+   # Remove this line:
+   get_it: ^8.0.2
+   ```
+
+3. Run `flutter pub get` to update dependencies
+
+---
+
+**Status**: ✅ **MIGRATION COMPLETE - NO ERRORS**
+
+The app now uses pure Riverpod for all dependency injection!