Add SharedPreferencesService

frontend/lib/services/shared_preferences_service.dart

@@ -0,0 +1,106 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+class SharedPreferencesService {
+  SharedPreferencesService._privateConstructor();
+
+  static final SharedPreferencesService instance =
+      SharedPreferencesService._privateConstructor();
+
+  Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
+
+  /// Sets a boolean [value] for the given [key] in the shared preferences.
+  ///
+  /// Example:
+  /// ```dart
+  /// await prefsService.setBool('isLoggedIn', true);
+  /// ```
+  Future<void> setBool(String key, bool value) async {
+    final prefs = await _prefs;
+    prefs.setBool(key, value);
+  }
+
+  /// Sets a string [value] for the given [key] in the shared preferences.
+  ///
+  /// Example:
+  /// ```dart
+  /// await prefsService.setString('username', 'Alice');
+  /// ```
+  Future<void> setString(String key, String value) async {
+    final prefs = await _prefs;
+    prefs.setString(key, value);
+  }
+
+  /// Sets an integer [value] for the given [key] in the shared preferences.
+  ///
+  /// Example:
+  /// ```dart
+  /// await prefsService.setInt('age', 30);
+  /// ```
+  Future<void> setInt(String key, int value) async {
+    final prefs = await _prefs;
+    prefs.setInt(key, value);
+  }
+
+  /// Sets a list of strings [value] for the given [key] in the shared preferences.
+  ///
+  /// Example:
+  /// ```dart
+  /// await prefsService.setStringList('favorites', ['Apples', 'Bananas']);
+  /// ```
+  Future<void> setStringList(String key, List<String> value) async {
+    final prefs = await _prefs;
+    prefs.setStringList(key, value);
+  }
+
+  /// Retrieves a boolean value for the given [key] from the shared preferences.
+  ///
+  /// Returns `null` if the key does not exist.
+  ///
+  /// Example:
+  /// ```dart
+  /// bool? isLoggedIn = await prefsService.getBool('isLoggedIn');
+  /// ```
+  Future<bool?> getBool(String key) async {
+    final prefs = await _prefs;
+    return prefs.getBool(key);
+  }
+
+  /// Retrieves a string value for the given [key] from the shared preferences.
+  ///
+  /// Returns `null` if the key does not exist.
+  ///
+  /// Example:
+  /// ```dart
+  /// String? username = await prefsService.getString('username');
+  /// ```
+  Future<String?> getString(String key) async {
+    final prefs = await _prefs;
+    return prefs.getString(key);
+  }
+
+  /// Retrieves an integer value for the given [key] from the shared preferences.
+  ///
+  /// Returns `null` if the key does not exist.
+  ///
+  /// Example:
+  /// ```dart
+  /// int? age = await prefsService.getInt('age');
+  /// ```
+  Future<int?> getInt(String key) async {
+    final prefs = await _prefs;
+    return prefs.getInt(key);
+  }
+
+  /// Retrieves a list of strings for the given [key] from the shared preferences.
+  ///
+  /// Returns `null` if the key does not exist.
+  ///
+  /// Example:
+  /// ```dart
+  /// List<String>? favorites = await prefsService.getStringList('favorites');
+  /// ```
+  Future<List<String>?> getStringList(String key) async {
+    final prefs = await _prefs;
+    return prefs.getStringList(key);
+  }
+}

frontend/lib/viewmodels/settings_viewmodel.dart

@@ -30,7 +30,6 @@ class SettingsViewModel extends ChangeNotifier {
   Future<void> _loadPreferences() async {
     final prefs = await SharedPreferences.getInstance();
     _isDarkModeEnabled = prefs.getBool('isDarkModeEnabled') ?? false;
-    // TODO: We should make this disable test suites
     _isDeveloperModeEnabled = prefs.getBool('isDeveloperModeEnabled') ?? true;
     _baseURL = prefs.getString('baseURL') ?? 'http://127.0.0.1:8000/ap/v1';
     _restApiUtility.updateBaseURL(_baseURL);