75 lines
2.0 KiB
Dart
75 lines
2.0 KiB
Dart
import 'dart:convert';
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import 'package:shared_preferences/shared_preferences.dart';
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import '../task.dart';
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import 'interfaces/task_repository.dart';
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class LocalRepository implements TaskRepository {
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static const String _tasksKey = 'tasks';
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static const String _taskOrderKey = 'taskOrder';
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SharedPreferencesWithCache? _prefs;
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Future<void> initialize() async {
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if (_prefs == null) {
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await SharedPreferencesWithCache.create(
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cacheOptions: const SharedPreferencesWithCacheOptions(
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allowList: <String>{_tasksKey, _taskOrderKey},
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),
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).then((value) => _prefs = value);
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}
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}
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// Create
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@override
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Future<void> saveTask(Task task) async {
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final tasks = await loadTasks();
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if (tasks.contains(task)) {
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tasks.remove(task);
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} else {
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final taskOrder = (await loadTaskOrder()).toList();
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taskOrder.add(task.id);
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await saveTaskOrder(taskOrder);
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}
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tasks.add(task);
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return saveTasks(tasks);
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}
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@override
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Future<void> saveTasks(List<Task> tasks) async {
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final jsonList = tasks.map<String>((e) => jsonEncode(e.toJson())).toList();
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return _prefs!.setStringList(_tasksKey, jsonList);
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}
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@override
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Future<void> saveTaskOrder(Iterable<String> taskOrder) {
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final jsonList = taskOrder.map<String>((e) => jsonEncode(e)).toList();
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return _prefs!.setStringList(_taskOrderKey, jsonList);
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}
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// Read
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@override
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Future<Iterable<String>> loadTaskOrder() async {
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final Iterable<String> jsonList =
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_prefs!.getStringList(_taskOrderKey) ?? [];
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return jsonList.map<String>((e) => jsonDecode(e));
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}
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@override
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Future<List<Task>> loadTasks() async {
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final Iterable<String> jsonList = _prefs!.getStringList(_tasksKey) ?? [];
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return jsonList.map<Task>((e) => Task.fromJson(jsonDecode(e))).toList();
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}
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// Delete
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@override
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Future<void> deleteTask(Task task) async {
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final tasks = await loadTasks();
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tasks.remove(task);
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saveTasks(tasks);
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}
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}
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