Refactor TaskViewModel to use SharedPreferencesService

Author: hunteraraujo

frontend/lib/main.dart

@@ -102,8 +102,12 @@ class MyApp extends StatelessWidget {
                     create: (context) => ChatViewModel(
                         Provider.of<ChatService>(context, listen: false))),
                 ChangeNotifierProvider(
-                    create: (context) => TaskViewModel(
-                        Provider.of<TaskService>(context, listen: false))),
+                  create: (context) => TaskViewModel(
+                    Provider.of<TaskService>(context, listen: false),
+                    Provider.of<SharedPreferencesService>(context,
+                        listen: false),
+                  ),
+                ),
                 ChangeNotifierProvider(
                     create: (context) => SkillTreeViewModel()),
                 ChangeNotifierProvider(

frontend/lib/viewmodels/task_viewmodel.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'package:auto_gpt_flutter_client/models/task.dart';
 import 'package:auto_gpt_flutter_client/models/test_suite.dart';
+import 'package:auto_gpt_flutter_client/services/shared_preferences_service.dart';
 import 'package:flutter/foundation.dart';
 import 'package:collection/collection.dart';
 import 'package:auto_gpt_flutter_client/services/task_service.dart';
@@ -10,6 +11,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 // TODO: How will all these functions work with test suites?
 class TaskViewModel with ChangeNotifier {
   final TaskService _taskService;
+  final SharedPreferencesService _prefsService;
 
   List<Task> _tasks = [];
   List<TestSuite> _testSuites = [];
@@ -19,7 +21,7 @@ class TaskViewModel with ChangeNotifier {
   Task? _selectedTask;
   TestSuite? _selectedTestSuite;
 
-  TaskViewModel(this._taskService);
+  TaskViewModel(this._taskService, this._prefsService);
 
   /// Returns the currently selected task.
   Task? get selectedTask => _selectedTask;
@@ -107,10 +109,9 @@ class TaskViewModel with ChangeNotifier {
 
   // Helper method to save test suites to SharedPreferences
   Future<void> _saveTestSuitesToPrefs() async {
-    final prefs = await SharedPreferences.getInstance();
     final testSuitesToStore =
         _testSuites.map((testSuite) => jsonEncode(testSuite.toJson())).toList();
-    prefs.setStringList('testSuites', testSuitesToStore);
+    await _prefsService.setStringList('testSuites', testSuitesToStore);
   }
 
   // Adds a new test suite and saves it to SharedPreferences
@@ -123,8 +124,8 @@ class TaskViewModel with ChangeNotifier {
 
   // Fetch test suites from SharedPreferences
   Future<void> fetchTestSuites() async {
-    final prefs = await SharedPreferences.getInstance();
-    final storedTestSuites = prefs.getStringList('testSuites') ?? [];
+    final storedTestSuites =
+        await _prefsService.getStringList('testSuites') ?? [];
     _testSuites = storedTestSuites
         .map((testSuiteMap) => TestSuite.fromJson(jsonDecode(testSuiteMap)))
         .toList();