feat: implement use cases for retrieving default and supported locales

apps/mobile/apps/client/lib/main.dart

@@ -56,8 +56,7 @@ class AppWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return BlocProvider<core_localization.LocaleBloc>(
       create: (BuildContext context) =>
-          Modular.get<core_localization.LocaleBloc>()
-            ..add(const core_localization.LoadLocale()),
+          Modular.get<core_localization.LocaleBloc>(),
       child:
           BlocBuilder<
             core_localization.LocaleBloc,

apps/mobile/packages/core_localization/lib/src/bloc/locale_bloc.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import '../domain/usecases/get_default_locale_use_case.dart';
 import '../domain/usecases/get_locale_use_case.dart';
+import '../domain/usecases/get_supported_locales_use_case.dart';
 import '../domain/usecases/set_locale_use_case.dart';
 import '../l10n/strings.g.dart';
 import 'locale_event.dart';
@@ -12,8 +14,12 @@ import 'locale_state.dart';
 /// using [SetLocaleUseCase] and [GetLocaleUseCase].
 class LocaleBloc extends Bloc<LocaleEvent, LocaleState> {
   /// Creates a [LocaleBloc] with the required use cases.
-  LocaleBloc({required this.getLocaleUseCase, required this.setLocaleUseCase})
-    : super(LocaleState.initial()) {
+  LocaleBloc({
+    required this.getLocaleUseCase,
+    required this.setLocaleUseCase,
+    required this.getSupportedLocalesUseCase,
+    required this.getDefaultLocaleUseCase,
+  }) : super(LocaleState.initial()) {
     on<ChangeLocale>(_onChangeLocale);
     on<LoadLocale>(_onLoadLocale);
 
@@ -27,6 +33,12 @@ class LocaleBloc extends Bloc<LocaleEvent, LocaleState> {
   /// Use case for saving the selected locale.
   final SetLocaleUseCase setLocaleUseCase;
 
+  /// Use case for retrieving supported locales.
+  final GetSupportedLocalesUseCase getSupportedLocalesUseCase;
+
+  /// Use case for retrieving the default locale.
+  final GetDefaultLocaleUseCase getDefaultLocaleUseCase;
+
   /// Handles the [ChangeLocale] event by saving it via the use case and emitting new state.
   Future<void> _onChangeLocale(
     ChangeLocale event,
@@ -53,10 +65,16 @@ class LocaleBloc extends Bloc<LocaleEvent, LocaleState> {
     Emitter<LocaleState> emit,
   ) async {
     final Locale? savedLocale = await getLocaleUseCase();
-    final Locale locale = savedLocale ?? const Locale('es');
+    final Locale defaultLocale = getDefaultLocaleUseCase();
+    final List<Locale> supportedLocales = getSupportedLocalesUseCase();
+
+    final Locale locale = savedLocale ?? defaultLocale;
 
     await LocaleSettings.setLocaleRaw(locale.languageCode);
 
-    emit(LocaleState(locale: locale, supportedLocales: state.supportedLocales));
+    emit(LocaleState(
+      locale: locale,
+      supportedLocales: supportedLocales,
+    ));
   }
 }

apps/mobile/packages/core_localization/lib/src/bloc/locale_state.dart

@@ -1,20 +1,21 @@
 import 'package:flutter/material.dart';
+
 import '../l10n/strings.g.dart';
 
 /// Represents the current state of the application's localization.
 class LocaleState {
+  /// Creates a [LocaleState] with the specified [locale].
+  const LocaleState({required this.locale, required this.supportedLocales});
+
+    /// The initial state of the application, defaulting to English.
+  factory LocaleState.initial() => LocaleState(
+    locale: AppLocaleUtils.findDeviceLocale().flutterLocale,
+    supportedLocales: AppLocaleUtils.supportedLocales,
+  );
+
   /// The current active locale.
   final Locale locale;
 
   /// The list of supported locales for the application.
   final List<Locale> supportedLocales;
-
-  /// Creates a [LocaleState] with the specified [locale].
-  const LocaleState({required this.locale, required this.supportedLocales});
-
-  /// The initial state of the application, defaulting to English.
-  factory LocaleState.initial() => LocaleState(
-    locale: const Locale('es'),
-    supportedLocales: AppLocaleUtils.supportedLocales,
-  );
 }

apps/mobile/packages/core_localization/lib/src/data/repositories_impl/locale_repository_impl.dart

@@ -1,4 +1,6 @@
 import 'dart:ui';
+import 'package:core_localization/src/l10n/strings.g.dart';
+
 import '../../domain/repositories/locale_repository_interface.dart';
 import '../datasources/locale_local_data_source.dart';
 
@@ -18,11 +20,19 @@ class LocaleRepositoryImpl implements LocaleRepositoryInterface {
   }
 
   @override
-  Future<Locale?> getSavedLocale() async {
+  Future<Locale> getSavedLocale() async {
+    return getDefaultLocale();
+
+    /// TODO: FEATURE_NOT_IMPLEMENTED: Implement saved locale retrieval later
     final String? languageCode = await localDataSource.getLanguageCode();
     if (languageCode != null) {
       return Locale(languageCode);
     }
-    return null;
   }
+
+  @override
+  Locale getDefaultLocale() => AppLocaleUtils.findDeviceLocale().flutterLocale;
+
+  @override
+  List<Locale> getSupportedLocales() => AppLocaleUtils.supportedLocales;
 }

apps/mobile/packages/core_localization/lib/src/domain/repositories/locale_repository_interface.dart

@@ -14,4 +14,10 @@ abstract interface class LocaleRepositoryInterface {
   ///
   /// Returns `null` if no locale has been previously saved.
   Future<Locale?> getSavedLocale();
+
+  /// Retrieves the default [Locale] for the application.
+  Locale getDefaultLocale();
+
+  /// Retrieves the list of supported [Locale]s.
+  List<Locale> getSupportedLocales();
 }

apps/mobile/packages/core_localization/lib/src/domain/usecases/get_default_locale_use_case.dart

@@ -0,0 +1,15 @@
+import 'dart:ui';
+import '../repositories/locale_repository_interface.dart';
+
+/// Use case to retrieve the default locale.
+class GetDefaultLocaleUseCase {
+  final LocaleRepositoryInterface _repository;
+
+  /// Creates a [GetDefaultLocaleUseCase] with the required [LocaleRepositoryInterface].
+  GetDefaultLocaleUseCase(this._repository);
+
+  /// Retrieves the default locale.
+  Locale call() {
+    return _repository.getDefaultLocale();
+  }
+}

apps/mobile/packages/core_localization/lib/src/domain/usecases/get_supported_locales_use_case.dart

@@ -0,0 +1,15 @@
+import 'dart:ui';
+import '../repositories/locale_repository_interface.dart';
+
+/// Use case to retrieve the list of supported locales.
+class GetSupportedLocalesUseCase {
+  final LocaleRepositoryInterface _repository;
+
+  /// Creates a [GetSupportedLocalesUseCase] with the required [LocaleRepositoryInterface].
+  GetSupportedLocalesUseCase(this._repository);
+
+  /// Retrieves the supported locales.
+  List<Locale> call() {
+    return _repository.getSupportedLocales();
+  }
+}

apps/mobile/packages/core_localization/lib/src/localization_module.dart

@@ -3,7 +3,9 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'data/datasources/locale_local_data_source.dart';
 import 'data/repositories_impl/locale_repository_impl.dart';
 import 'domain/repositories/locale_repository_interface.dart';
+import 'domain/usecases/get_default_locale_use_case.dart';
 import 'domain/usecases/get_locale_use_case.dart';
+import 'domain/usecases/get_supported_locales_use_case.dart';
 import 'domain/usecases/set_locale_use_case.dart';
 import 'bloc/locale_bloc.dart';
 
@@ -34,12 +36,20 @@ class LocalizationModule extends Module {
     i.addLazySingleton<SetLocaleUseCase>(
       () => SetLocaleUseCase(i.get<LocaleRepositoryInterface>()),
     );
+    i.addLazySingleton<GetSupportedLocalesUseCase>(
+      () => GetSupportedLocalesUseCase(i.get<LocaleRepositoryInterface>()),
+    );
+    i.addLazySingleton<GetDefaultLocaleUseCase>(
+      () => GetDefaultLocaleUseCase(i.get<LocaleRepositoryInterface>()),
+    );
 
     // BLoCs
     i.add<LocaleBloc>(
       () => LocaleBloc(
         getLocaleUseCase: i.get<GetLocaleUseCase>(),
         setLocaleUseCase: i.get<SetLocaleUseCase>(),
+        getSupportedLocalesUseCase: i.get<GetSupportedLocalesUseCase>(),
+        getDefaultLocaleUseCase: i.get<GetDefaultLocaleUseCase>(),
       ),
     );
   }