Refactor

lib/core/localization/locale_extensions.dart

@@ -0,0 +1,13 @@
+import 'package:flutter_localized_locales/flutter_localized_locales.dart';
+import 'package:hiddify/gen/fonts.gen.dart';
+import 'package:hiddify/gen/translations.g.dart';
+
+extension AppLocaleX on AppLocale {
+  String get preferredFontFamily =>
+      this == AppLocale.fa ? FontFamily.shabnam : "";
+
+  String get localeName =>
+      LocaleNamesLocalizationsDelegate
+          .nativeLocaleNames[flutterLocale.toString()] ??
+      name;
+}

lib/core/localization/locale_preferences.dart

@@ -0,0 +1,28 @@
+import 'package:hiddify/core/preferences/preferences_provider.dart';
+import 'package:hiddify/gen/translations.g.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'locale_preferences.g.dart';
+
+@Riverpod(keepAlive: true)
+class LocalePreferences extends _$LocalePreferences {
+  @override
+  AppLocale build() {
+    final persisted =
+        ref.watch(sharedPreferencesProvider).requireValue.getString("locale");
+    if (persisted == null) return AppLocaleUtils.findDeviceLocale();
+    // keep backward compatibility with chinese after changing zh to zh_CN
+    if (persisted == "zh") {
+      return AppLocale.zhCn;
+    }
+    return AppLocale.values.byName(persisted);
+  }
+
+  Future<void> changeLocale(AppLocale value) async {
+    state = value;
+    await ref
+        .read(sharedPreferencesProvider)
+        .requireValue
+        .setString("locale", value.name);
+  }
+}

lib/core/localization/translations.dart

@@ -0,0 +1,11 @@
+import 'package:hiddify/core/localization/locale_preferences.dart';
+import 'package:hiddify/gen/translations.g.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+export 'package:hiddify/gen/translations.g.dart';
+
+part 'translations.g.dart';
+
+@Riverpod(keepAlive: true)
+TranslationsEn translations(TranslationsRef ref) =>
+    ref.watch(localePreferencesProvider).build();