From 903a2aab6fc5b4b0699a61a4afb21950ec331ab5 Mon Sep 17 00:00:00 2001
From: UgoKo-Rubeast <102586132+UgoKo-Rubeast@users.noreply.github.com>
Date: Tue, 10 May 2022 00:14:42 +0900
Subject: [PATCH] feat: #849 Add language selection to dev mode (#1729)

* feature/849-add-language-selection

* feature/849-add-language-selection add language selection to dev mode

* feature/849-add-language-selection add context.select to main.dart for watching locale

* feature/849-add-language-selection flutter format

* feature/849-add-language-selection add app language reset to dev mode

* feature/849-add-language-selection change app language reset from platform.localeName to null

Co-authored-by: Pierre Slamich <pierre@openfoodfacts.org>
---
 .../lib/data_models/user_preferences.dart     | 15 ++++++++++
 packages/smooth_app/lib/l10n/app_en.arb       |  4 +++
 packages/smooth_app/lib/main.dart             |  3 ++
 .../lib/pages/user_preferences_dev_mode.dart  | 30 +++++++++++++++++++
 4 files changed, 52 insertions(+)

diff --git a/packages/smooth_app/lib/data_models/user_preferences.dart b/packages/smooth_app/lib/data_models/user_preferences.dart
index 80a9ed564a2..20d9fbabd70 100644
--- a/packages/smooth_app/lib/data_models/user_preferences.dart
+++ b/packages/smooth_app/lib/data_models/user_preferences.dart
@@ -3,6 +3,7 @@ import 'package:openfoodfacts/personalized_search/preference_importance.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:smooth_app/data_models/product_preferences.dart';
 import 'package:smooth_app/pages/onboarding/onboarding_flow_navigator.dart';
+import 'package:smooth_app/pages/user_preferences_dev_mode.dart';
 
 class UserPreferences extends ChangeNotifier {
   UserPreferences._shared(final SharedPreferences sharedPreferences)
@@ -89,6 +90,20 @@ class UserPreferences extends ChangeNotifier {
         : OnboardingPage.values[pageIndex];
   }
 
+  Future<void> setAppLanguageCode(String? languageCode) async {
+    if (languageCode == null) {
+      await _sharedPreferences
+          .remove(UserPreferencesDevMode.userPreferencesAppLanguageCode);
+    } else {
+      await setDevModeString(
+          UserPreferencesDevMode.userPreferencesAppLanguageCode, languageCode);
+    }
+    notifyListeners();
+  }
+
+  String? get appLanguageCode =>
+      getDevModeString(UserPreferencesDevMode.userPreferencesAppLanguageCode);
+
   String _getFlagTag(final String key) => _TAG_PREFIX_FLAG + key;
 
   Future<void> setFlag(
diff --git a/packages/smooth_app/lib/l10n/app_en.arb b/packages/smooth_app/lib/l10n/app_en.arb
index 0f067fe9d79..3a696f4b3b7 100644
--- a/packages/smooth_app/lib/l10n/app_en.arb
+++ b/packages/smooth_app/lib/l10n/app_en.arb
@@ -988,6 +988,10 @@
     "@dev_preferences_export_history_title": {
         "description": "User dev preferences - Export history - Title"
     },
+    "dev_preferences_reset_app_language": "Reset App Language",
+    "@dev_preferences_reset_app_language": {
+        "description": "User dev preferences - Reset App Language - Title"
+    },
     "dev_preferences_export_history_progress_error": "exception",
     "@dev_preferences_export_history_progress_error": {
         "description": "User dev preferences - Export history - Item - Error"
diff --git a/packages/smooth_app/lib/main.dart b/packages/smooth_app/lib/main.dart
index 5a2ad00394d..82f180252c2 100644
--- a/packages/smooth_app/lib/main.dart
+++ b/packages/smooth_app/lib/main.dart
@@ -180,8 +180,11 @@ class _SmoothAppState extends State<SmoothApp> {
     final ThemeProvider themeProvider = context.watch<ThemeProvider>();
     final Widget appWidget = OnboardingFlowNavigator(_userPreferences)
         .getPageWidget(context, _userPreferences.lastVisitedOnboardingPage);
+    final String? languageCode =
+        context.select((UserPreferences _up) => _up.appLanguageCode);
 
     return MaterialApp(
+      locale: languageCode != null ? Locale(languageCode) : null,
       localizationsDelegates: AppLocalizations.localizationsDelegates,
       supportedLocales: AppLocalizations.supportedLocales,
       debugShowCheckedModeBanner: !(kReleaseMode || _screenshots),
diff --git a/packages/smooth_app/lib/pages/user_preferences_dev_mode.dart b/packages/smooth_app/lib/pages/user_preferences_dev_mode.dart
index 391d54c0d86..0a5e34c64e2 100644
--- a/packages/smooth_app/lib/pages/user_preferences_dev_mode.dart
+++ b/packages/smooth_app/lib/pages/user_preferences_dev_mode.dart
@@ -46,6 +46,7 @@ class UserPreferencesDevMode extends AbstractUserPreferences {
       '__additionalButtonOnProductPage';
   static const String userPreferencesFlagEditIngredients = '__editIngredients';
   static const String userPreferencesEnumScanMode = '__scanMode';
+  static const String userPreferencesAppLanguageCode = '__appLanguage';
   static const String userPreferencesCameraPostFrameDuration =
       '__cameraPostFrameDuration';
 
@@ -335,6 +336,35 @@ class UserPreferencesDevMode extends AbstractUserPreferences {
             setState(() {});
           },
         ),
+        ListTile(
+          leading: const Icon(Icons.language),
+          title: DropdownButton<String>(
+            value: userPreferences.appLanguageCode ??
+                Localizations.localeOf(context).toString(),
+            elevation: 16,
+            isExpanded: true,
+            onChanged: (String? languageCode) async {
+              await userPreferences.setAppLanguageCode(languageCode);
+              setState(() {});
+            },
+            items: AppLocalizations.supportedLocales.map((Locale locale) {
+              final String _locale = locale.toString();
+              return DropdownMenuItem<String>(
+                value: _locale,
+                child: Text(_locale),
+              );
+            }).toList(),
+          ),
+        ),
+        ListTile(
+          title: Text(
+            appLocalizations.dev_preferences_reset_app_language,
+          ),
+          onTap: () async {
+            await userPreferences.setAppLanguageCode(null);
+            setState(() {});
+          },
+        ),
       ];
 
   ScaffoldFeatureController<SnackBar, SnackBarClosedReason>