import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:timezone/timezone.dart' as tz;
import 'package:timezone/data/latest.dart' as tz_data;

class NotificationsRepository {
  final FlutterLocalNotificationsPlugin _notificationsPlugin;

  NotificationsRepository() : _notificationsPlugin = FlutterLocalNotificationsPlugin() {
    _initialize();
  }

  Future<void> _initialize() async {
    tz_data.initializeTimeZones();

    const androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
    const iosSettings = DarwinInitializationSettings();

    const initSettings = InitializationSettings(
      android: androidSettings,
      iOS: iosSettings,
    );

    await _notificationsPlugin.initialize(initSettings);
  }

  Future<void> showNotification({
    required int id,
    required String title,
    required String body,
    String? payload,
  }) async {
    const androidDetails = AndroidNotificationDetails(
      'lifetimer_channel',
      'LifeTimer Notifications',
      channelDescription: 'Notifications for LifeTimer app',
      importance: Importance.high,
      priority: Priority.high,
    );

    const iosDetails = DarwinNotificationDetails();

    const notificationDetails = NotificationDetails(
      android: androidDetails,
      iOS: iosDetails,
    );

    await _notificationsPlugin.show(
      id,
      title,
      body,
      notificationDetails,
      payload: payload,
    );
  }

  Future<void> scheduleNotification({
    required int id,
    required String title,
    required String body,
    required DateTime scheduledDate,
    String? payload,
  }) async {
    const androidDetails = AndroidNotificationDetails(
      'lifetimer_channel',
      'LifeTimer Notifications',
      channelDescription: 'Notifications for LifeTimer app',
      importance: Importance.high,
      priority: Priority.high,
    );

    const iosDetails = DarwinNotificationDetails();

    const notificationDetails = NotificationDetails(
      android: androidDetails,
      iOS: iosDetails,
    );

    await _notificationsPlugin.zonedSchedule(
      id,
      title,
      body,
      tz.TZDateTime.from(scheduledDate, tz.local),
      notificationDetails,
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      payload: payload,
    );
  }

  Future<void> scheduleDailyReminder({
    required int id,
    required String title,
    required String body,
    required int hour,
    required int minute,
  }) async {
    const androidDetails = AndroidNotificationDetails(
      'lifetimer_daily_channel',
      'Daily Reminders',
      channelDescription: 'Daily reminder notifications',
      importance: Importance.high,
      priority: Priority.high,
    );

    const iosDetails = DarwinNotificationDetails();

    const notificationDetails = NotificationDetails(
      android: androidDetails,
      iOS: iosDetails,
    );

    await _notificationsPlugin.zonedSchedule(
      id,
      title,
      body,
      _nextInstanceOfTime(hour, minute),
      notificationDetails,
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      matchDateTimeComponents: DateTimeComponents.time,
      payload: 'daily_reminder',
    );
  }

  Future<void> cancelNotification(int id) async {
    await _notificationsPlugin.cancel(id);
  }

  Future<void> cancelAllNotifications() async {
    await _notificationsPlugin.cancelAll();
  }

  Future<List<PendingNotificationRequest>> getPendingNotifications() async {
    return await _notificationsPlugin.pendingNotificationRequests();
  }

  tz.TZDateTime _nextInstanceOfTime(int hour, int minute) {
    final now = tz.TZDateTime.now(tz.local);
    final scheduledDate = tz.TZDateTime(
      tz.local,
      now.year,
      now.month,
      now.day,
      hour,
      minute,
      0,
    );

    if (scheduledDate.isBefore(now)) {
      return scheduledDate.add(const Duration(days: 1));
    }

    return scheduledDate;
  }

}