import 'package:hive_flutter/hive_flutter.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import '../models/task_model.dart';
import '../models/alarm_model.dart';
import '../models/mind_map_model.dart';
import '../models/calendar_event_model.dart';

class LocalStorageService {
  static const String _tasksBoxName = 'tasks';
  static const String _alarmsBoxName = 'alarms';
  static const String _mindMapsBoxName = 'mindMaps';
  static const String _eventsBoxName = 'events';
  static const String _settingsBoxName = 'settings';

  late Box<Map> _tasksBox;
  late Box<Map> _alarmsBox;
  late Box<Map> _mindMapsBox;
  late Box<Map> _eventsBox;
  late Box<Object?> _settingsBox;

  Future<void> initialize() async {
    await Hive.initFlutter();

    _tasksBox = await Hive.openBox<Map>(_tasksBoxName);
    _alarmsBox = await Hive.openBox<Map>(_alarmsBoxName);
    _mindMapsBox = await Hive.openBox<Map>(_mindMapsBoxName);
    _eventsBox = await Hive.openBox<Map>(_eventsBoxName);
    _settingsBox = await Hive.openBox<Object?>(_settingsBoxName);
  }

  // Tasks
  Future<void> saveTask(TaskModel task) async {
    final data = _convertTimestamps(task.toFirestore());
    data['id'] = task.id; // Добавляем id для fromMap
    await _tasksBox.put(task.id, data);
  }

  Future<void> saveTasks(List<TaskModel> tasks) async {
    for (final task in tasks) {
      final data = _convertTimestamps(task.toFirestore());
      data['id'] = task.id;
      await _tasksBox.put(task.id, data);
    }
  }

  List<TaskModel> getTasks() {
    return _tasksBox.values.map((data) {
      final restoredData = _restoreTimestamps(data);
      return TaskModel.fromMap(restoredData);
    }).toList();
  }

  Future<void> deleteTask(String taskId) async {
    await _tasksBox.delete(taskId);
  }

  // Alarms
  Future<void> saveAlarm(AlarmModel alarm) async {
    await _alarmsBox.put(alarm.id, _convertTimestamps(alarm.toFirestore()));
  }

  List<AlarmModel> getAlarms() {
    return _alarmsBox.keys.map((id) {
      final data = _alarmsBox.get(id) as Map<dynamic, dynamic>;
      final restoredData = _restoreTimestamps(data);
      return AlarmModel.fromMap(id.toString(), restoredData);
    }).toList();
  }

  Future<void> deleteAlarm(String alarmId) async {
    await _alarmsBox.delete(alarmId);
  }

  // Mind Maps
  Future<void> saveMindMapNodes(List<MindMapNode> nodes) async {
    for (final node in nodes) {
      await _mindMapsBox.put(node.id, _convertTimestamps(node.toFirestore()));
    }
  }

  List<MindMapNode> getMindMapNodes() {
    return _mindMapsBox.keys.map((id) {
      final data = _mindMapsBox.get(id) as Map<dynamic, dynamic>;
      final restoredData = _restoreTimestamps(data);
      return MindMapNode.fromMap(id.toString(), restoredData);
    }).toList();
  }

  // Events
  Future<void> saveEvent(CalendarEventModel event) async {
    await _eventsBox.put(event.id, _convertTimestamps(event.toFirestore()));
  }

  List<CalendarEventModel> getEvents() {
    return _eventsBox.keys.map((id) {
      final data = _eventsBox.get(id) as Map<dynamic, dynamic>;
      final restoredData = _restoreTimestamps(data);
      return CalendarEventModel.fromMap(id.toString(), restoredData);
    }).toList();
  }

  // Settings
  Future<void> saveSetting(String key, Object? value) async {
    await _settingsBox.put(key, value);
  }

  T? getSetting<T>(String key, {T? defaultValue}) {
    return _settingsBox.get(key, defaultValue: defaultValue) as T?;
  }

  // Clear all local data
  Future<void> clearAll() async {
    await _tasksBox.clear();
    await _alarmsBox.clear();
    await _mindMapsBox.clear();
    await _eventsBox.clear();
    await _settingsBox.clear();
  }

  // Sync with Firebase (merge remote and local)
  Future<void> syncWithRemote(List<TaskModel> remoteTasks) async {
    final localTasks = getTasks();
    final localMap = {for (var t in localTasks) t.id: t};
    final remoteMap = {for (var t in remoteTasks) t.id: t};

    // Merge: remote takes precedence
    final merged = {...localMap, ...remoteMap};

    await _tasksBox.clear();
    for (final task in merged.values) {
      await _tasksBox.put(task.id, _convertTimestamps(task.toFirestore()));
    }
  }

  // Конвертирует Firestore Timestamp в ISO строки для Hive
  Map<String, dynamic> _convertTimestamps(Map<String, dynamic> data) {
    final converted = <String, dynamic>{};
    for (final entry in data.entries) {
      if (entry.value is Timestamp) {
        // Конвертируем Timestamp → ISO строка
        converted[entry.key] = {
          '__type__': 'timestamp',
          'value': (entry.value as Timestamp).toDate().toIso8601String(),
        };
      } else if (entry.value is Map<String, dynamic>) {
        converted[entry.key] =
            _convertTimestamps(entry.value as Map<String, dynamic>);
      } else {
        converted[entry.key] = entry.value;
      }
    }
    return converted;
  }

  // Восстанавливает ISO строки обратно в Timestamp из Hive
  Map<String, dynamic> _restoreTimestamps(Map<dynamic, dynamic> data) {
    final converted = <String, dynamic>{};
    for (final entry in data.entries) {
      final key = entry.key.toString();
      if (entry.value is Map &&
          (entry.value as Map).containsKey('__type__') &&
          (entry.value as Map)['__type__'] == 'timestamp') {
        // Конвертируем ISO строку → Timestamp
        final dateStr = (entry.value as Map)['value'] as String;
        converted[key] = Timestamp.fromDate(DateTime.parse(dateStr));
      } else if (entry.value is Map) {
        converted[key] =
            _restoreTimestamps(entry.value as Map<dynamic, dynamic>);
      } else {
        converted[key] = entry.value;
      }
    }
    return converted;
  }
}

final localStorageService = LocalStorageService();