From 6e6b9280c07086d36269d6230821b4fb278e48e8 Mon Sep 17 00:00:00 2001
From: marco <marco@skup.in>
Date: Fri, 12 Jun 2026 12:23:39 +0200
Subject: [PATCH] added storage class that uses shared preferences

---
 lib/model/repositories/local_repository.dart | 74 ++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 lib/model/repositories/local_repository.dart

diff --git a/lib/model/repositories/local_repository.dart b/lib/model/repositories/local_repository.dart
new file mode 100644
index 0000000..f921dd3
--- /dev/null
+++ b/lib/model/repositories/local_repository.dart
@@ -0,0 +1,74 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../task.dart';
+import 'interfaces/task_repository.dart';
+
+class LocalRepository implements TaskRepository {
+  static const String _tasksKey = 'tasks';
+  static const String _taskOrderKey = 'taskOrder';
+  SharedPreferencesWithCache? _prefs;
+
+  Future<void> initialize() async {
+    if (_prefs == null) {
+      await SharedPreferencesWithCache.create(
+        cacheOptions: const SharedPreferencesWithCacheOptions(
+          allowList: <String>{_tasksKey, _taskOrderKey},
+        ),
+      ).then((value) => _prefs = value);
+    }
+  }
+
+  // Create
+
+  @override
+  Future<void> saveTask(Task task) async {
+    final tasks = await loadTasks();
+    if (tasks.contains(task)) {
+      tasks.remove(task);
+    } else {
+      final taskOrder = (await loadTaskOrder()).toList();
+      taskOrder.add(task.id);
+      await saveTaskOrder(taskOrder);
+    }
+    tasks.add(task);
+    return saveTasks(tasks);
+  }
+
+  @override
+  Future<void> saveTasks(List<Task> tasks) async {
+    final jsonList = tasks.map<String>((e) => jsonEncode(e.toJson())).toList();
+    return _prefs!.setStringList(_tasksKey, jsonList);
+  }
+
+  @override
+  Future<void> saveTaskOrder(Iterable<String> taskOrder) {
+    final jsonList = taskOrder.map<String>((e) => jsonEncode(e)).toList();
+    return _prefs!.setStringList(_taskOrderKey, jsonList);
+  }
+
+  // Read
+
+  @override
+  Future<Iterable<String>> loadTaskOrder() async {
+    final Iterable<String> jsonList =
+        _prefs!.getStringList(_taskOrderKey) ?? [];
+    return jsonList.map<String>((e) => jsonDecode(e));
+  }
+
+  @override
+  Future<List<Task>> loadTasks() async {
+    final Iterable<String> jsonList = _prefs!.getStringList(_tasksKey) ?? [];
+    return jsonList.map<Task>((e) => Task.fromJson(jsonDecode(e))).toList();
+  }
+
+  // Delete
+
+  @override
+  Future<void> deleteTask(Task task) async {
+    final tasks = await loadTasks();
+    tasks.remove(task);
+    saveTasks(tasks);
+  }
+}