Add app settings local data source for locale management and update localization provider

Author: winechit-dev

lib/app/app.dart

@@ -5,6 +5,7 @@ import 'package:provider/provider.dart';
 import 'package:tmdb_flutter/app/cubit/favorite_movies_cubit.dart';
 import 'package:tmdb_flutter/app/cubit/home_cubit.dart';
 import 'package:tmdb_flutter/app/cubit/movie_details_cubit.dart';
+import 'package:tmdb_flutter/app/data/local/app_settings_local_data_source.dart';
 import 'package:tmdb_flutter/app/injection.dart';
 import 'package:tmdb_flutter/app/providers/localization_provider.dart';
 import 'package:tmdb_flutter/app/view/main_page.dart';
@@ -18,7 +19,7 @@ class App extends StatelessWidget {
     return MultiProvider(
       providers: [
         ChangeNotifierProvider(
-          create: (_) => LocalizationProvider(),
+          create: (_) => LocalizationProvider(getIt<AppSettingsLocalDataSource>()),
         ),
         BlocProvider(
           create: (context) => getIt<HomeCubit>(),

lib/app/data/local/app_settings_local_data_source.dart

@@ -0,0 +1,32 @@
+import 'package:sqflite/sqflite.dart';
+import 'package:tmdb_flutter/app/data/local/database_helper.dart';
+
+class AppSettingsLocalDataSource {
+  AppSettingsLocalDataSource(this._databaseHelper);
+
+  final DatabaseHelper _databaseHelper;
+  static const String _localeKey = 'locale';
+
+  Future<void> saveLocale(String languageCode) async {
+    final db = await _databaseHelper.database;
+    await db.insert(
+      'app_settings',
+      {
+        'key': _localeKey,
+        'value': languageCode,
+      },
+      conflictAlgorithm: ConflictAlgorithm.replace,
+    );
+  }
+
+  Future<String?> getLocale() async {
+    final db = await _databaseHelper.database;
+    final result = await db.query(
+      'app_settings',
+      where: 'key = ?',
+      whereArgs: [_localeKey],
+    );
+    if (result.isEmpty) return null;
+    return result.first['value']! as String;
+  }
+}

lib/app/data/local/database_helper.dart

@@ -19,8 +19,9 @@ class DatabaseHelper {
     final path = join(await getDatabasesPath(), 'favorite_movies.db');
     return openDatabase(
       path,
-      version: 1,
+      version: 2,
       onCreate: _onCreate,
+      onUpgrade: _onUpgrade,
     );
   }
 
@@ -37,5 +38,25 @@ class DatabaseHelper {
         createdAt TEXT NOT NULL
       )
     ''');
+
+    await db.execute('''
+      CREATE TABLE app_settings(
+        id INTEGER PRIMARY KEY,
+        key TEXT NOT NULL UNIQUE,
+        value TEXT NOT NULL
+      )
+    ''');
+  }
+
+  Future<void> _onUpgrade(Database db, int oldVersion, int newVersion) async {
+    if (oldVersion < 2) {
+      await db.execute('''
+        CREATE TABLE app_settings(
+          id INTEGER PRIMARY KEY,
+          key TEXT NOT NULL UNIQUE,
+          value TEXT NOT NULL
+        )
+      ''');
+    }
   }
 }

lib/app/injection.dart

@@ -2,6 +2,7 @@ import 'package:get_it/get_it.dart';
 import 'package:injectable/injectable.dart';
 import 'package:tmdb_flutter/app/cubit/favorite_movies_cubit.dart';
 import 'package:tmdb_flutter/app/cubit/home_cubit.dart';
+import 'package:tmdb_flutter/app/data/local/app_settings_local_data_source.dart';
 import 'package:tmdb_flutter/app/data/local/database_helper.dart';
 import 'package:tmdb_flutter/app/data/local/favorite_movies_local_data_source.dart';
 import 'package:tmdb_flutter/app/data/remote/movie_api.dart';
@@ -18,6 +19,9 @@ Future<void> configureDependencies() async {
     ..registerSingleton<MovieAPI>(MovieAPI())
 
     // Register factories
+    ..registerFactory<AppSettingsLocalDataSource>(
+      () => AppSettingsLocalDataSource(getIt<DatabaseHelper>()),
+    )
     ..registerFactory<FavoriteMoviesLocalDataSource>(
       () => FavoriteMoviesLocalDataSource(getIt<DatabaseHelper>()),
     )

lib/app/providers/localization_provider.dart

@@ -1,12 +1,27 @@
 import 'package:flutter/material.dart';
+import 'package:tmdb_flutter/app/data/local/app_settings_local_data_source.dart';
 
 class LocalizationProvider extends ChangeNotifier {
+  LocalizationProvider(this._appSettingsLocalDataSource) {
+    _loadLocale();
+  }
+
+  final AppSettingsLocalDataSource _appSettingsLocalDataSource;
   Locale _locale = const Locale('en');
 
   Locale get locale => _locale;
 
-  void setLocale(String languageCode) {
+  Future<void> _loadLocale() async {
+    final savedLocale = await _appSettingsLocalDataSource.getLocale();
+    if (savedLocale != null) {
+      _locale = Locale(savedLocale);
+      notifyListeners();
+    }
+  }
+
+  Future<void> setLocale(String languageCode) async {
     _locale = Locale(languageCode);
+    await _appSettingsLocalDataSource.saveLocale(languageCode);
     notifyListeners();
   }
 }