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

class NotificationService {
  static final FlutterLocalNotificationsPlugin _notificationsPlugin =
      FlutterLocalNotificationsPlugin();

  /// Initialisation (à appeler dans main())
  static Future<void> initialize() async {
    tz.initializeTimeZones();

    const AndroidInitializationSettings androidInitSettings =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    const InitializationSettings initSettings = InitializationSettings(
      android: androidInitSettings,
      iOS: DarwinInitializationSettings(),
    );

    await _notificationsPlugin.initialize(initSettings);

    // Demande les permissions au lancement
    await requestPermissions();
  }

  /// Demander les permissions (Android 13+ et iOS)
  static Future<void> requestPermissions() async {
    // Android 13+
    final androidImplementation =
        _notificationsPlugin.resolvePlatformSpecificImplementation<
            AndroidFlutterLocalNotificationsPlugin>();
    await androidImplementation?.requestNotificationsPermission();

    // iOS
    final iosImplementation =
        _notificationsPlugin.resolvePlatformSpecificImplementation<
            IOSFlutterLocalNotificationsPlugin>();
    await iosImplementation?.requestPermissions(
      alert: true,
      badge: true,
      sound: true,
    );
  }

  /// Planifie une notification 1h avant l’évènement
  static Future<void> scheduleEventNotification({
    required String eventId,
    required String title,
    required String body,
    required DateTime eventDate,
  }) async {
    final scheduledDate = eventDate.subtract(const Duration(hours: 1));

    if (scheduledDate.isBefore(DateTime.now())) {
      // Trop tard pour notifier
      return;
    }

    await _notificationsPlugin.zonedSchedule(
      eventId.hashCode, // identifiant unique pour l’évènement
      title,
      body,
      tz.TZDateTime.from(scheduledDate, tz.local),
      const NotificationDetails(
        android: AndroidNotificationDetails(
          'events_channel',
          'Évènements',
          channelDescription: 'Notifications des évènements favoris',
          importance: Importance.high,
          priority: Priority.high,
        ),
        iOS: DarwinNotificationDetails(),
      ),
      androidScheduleMode: AndroidScheduleMode
          .inexactAllowWhileIdle, // évite l'erreur Exact Alarm
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      matchDateTimeComponents: DateTimeComponents.dateAndTime,
    );
  }

  /// Notification immédiate (debug)
  static Future<void> showTestNotification() async {
    await _notificationsPlugin.show(
      0,
      "Test Notification",
      "Ceci est une notification de debug",
      const NotificationDetails(
        android: AndroidNotificationDetails(
          'debug_channel',
          'Debug Notifications',
          channelDescription: 'Notifications de test pour debug',
          importance: Importance.max,
          priority: Priority.high,
        ),
        iOS: DarwinNotificationDetails(),
      ),
    );
  }

  /// Annule une notification planifiée
  static Future<void> cancel(String eventId) async {
    await _notificationsPlugin.cancel(eventId.hashCode);
  }
}