Refactor preferences service initialization to lazy load SharedPreferences and make registerDefaultServices synchronous

finlog_app/app/lib/main.dart

@@ -9,7 +9,7 @@ Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
   // any services
-  await App.registerDefaultServices();
+  App.registerDefaultServices();
 
   final logger = App.service<Logger>();
   logger.debug("[MAIN] Registered all default services");

finlog_app/fluttery/lib/fluttery.dart

@@ -9,7 +9,6 @@ import 'package:fluttery/src/storage/secure/secure_storage_impl.dart';
 import 'package:fluttery/src/system/worker/worker_impl.dart';
 import 'package:fluttery/worker.dart';
 import 'package:kiwi/kiwi.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 
 /// A class to manage services.
 class App {
@@ -32,11 +31,9 @@ class App {
   }
 
   /// Registers the default services required by the application.
-  static Future<void> registerDefaultServices() async {
+  static void registerDefaultServices() {
-    final prefs = await SharedPreferences.getInstance();
-
     registerService<Logger>(() => LoggerImpl());
-    registerService<Preferences>(() => PreferencesImpl(instance: prefs));
+    registerService<Preferences>(() => PreferencesImpl());
     registerService<SecureStorage>(() => SecureStorageImpl());
     registerService<Worker>(() => WorkerImpl());
   }

finlog_app/fluttery/lib/src/preferences/preferences_impl.dart

@@ -2,68 +2,85 @@ import 'package:fluttery/preferences.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 class PreferencesImpl implements Preferences {
-  final SharedPreferences _prefs;
+  late final SharedPreferences _prefs;
+  bool _initialized = false;
 
-  /// Constructor
+  Future<void> _ensureInitialized() async {
-  PreferencesImpl({required SharedPreferences instance}) : _prefs = instance;
+    if (!_initialized) {
+      _prefs = await SharedPreferences.getInstance();
+      _initialized = true;
+    }
+  }
 
   @override
   Future<void> setString(String key, String value) async {
+    await _ensureInitialized();
     await _prefs.setString(key, value);
   }
 
   @override
   Future<String?> getString(String key) async {
+    await _ensureInitialized();
     return _prefs.getString(key);
   }
 
   @override
   Future<void> setInt(String key, int value) async {
+    await _ensureInitialized();
     await _prefs.setInt(key, value);
   }
 
   @override
   Future<int?> getInt(String key) async {
+    await _ensureInitialized();
     return _prefs.getInt(key);
   }
 
   @override
   Future<void> setBool(String key, bool value) async {
+    await _ensureInitialized();
     await _prefs.setBool(key, value);
   }
 
   @override
   Future<bool?> getBool(String key) async {
+    await _ensureInitialized();
     return _prefs.getBool(key);
   }
 
   @override
   Future<void> setDouble(String key, double value) async {
+    await _ensureInitialized();
     await _prefs.setDouble(key, value);
   }
 
   @override
   Future<double?> getDouble(String key) async {
+    await _ensureInitialized();
     return _prefs.getDouble(key);
   }
 
   @override
   Future<void> setStringList(String key, List<String> value) async {
+    await _ensureInitialized();
     await _prefs.setStringList(key, value);
   }
 
   @override
   Future<List<String>?> getStringList(String key) async {
+    await _ensureInitialized();
     return _prefs.getStringList(key);
   }
 
   @override
   Future<void> remove(String key) async {
+    await _ensureInitialized();
     await _prefs.remove(key);
   }
 
   @override
   Future<void> clear() async {
+    await _ensureInitialized();
     await _prefs.clear();
   }
 }

finlog_app/fluttery/lib/src/system/worker/worker_impl.dart

@@ -53,7 +53,7 @@ class WorkerImpl implements Worker {
         }
 
         // Now it's safe to touch plugins (e.g., SharedPreferences).
-        await App.registerDefaultServices();
+        App.registerDefaultServices();
 
         preTask?.call();
 

finlog_app/fluttery/test/preferences/preferences_test.dart

@@ -11,8 +11,7 @@ void main() {
 
     // Create preferences instance that will use the real SharedPreferences
     // but with in-memory storage for testing
-    final sharedInstance = await SharedPreferences.getInstance();
+    preferences = PreferencesImpl();
-    preferences = PreferencesImpl(instance: sharedInstance);
 
     // Give time for initialization
     await Future.delayed(Duration.zero);