cpd_2022_zi/lib/service/notification_service.dart

import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:smoke_cess_app/service/date_service.dart';
import 'package:timezone/timezone.dart';

class NotificationService {
  static final NotificationService _notificationService =
      NotificationService._internal();

  factory NotificationService() {
    return _notificationService;
  }

  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

  NotificationService._internal();

  Future<void> initNotification() async {
    // Android initialization
    const AndroidInitializationSettings initializationSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    // ios initialization
    const DarwinInitializationSettings initializationSettingsIOS =
        DarwinInitializationSettings(
      requestAlertPermission: false,
      requestBadgePermission: false,
      requestSoundPermission: false,
    );

    const InitializationSettings initializationSettings =
        InitializationSettings(
            android: initializationSettingsAndroid,
            iOS: initializationSettingsIOS);
    // the initialization settings are initialized after they are setted
    bool? initialized = await flutterLocalNotificationsPlugin
        .initialize(initializationSettings);
    print(initialized);
  }

  Future<void> setAllNotifications() async {
    List<TZDateTime> moodDates = await getDatesforMood();
    List<TZDateTime> sleepDates = await getDatesforSleep();
    for (var date in moodDates) {
      setNotification(1, "Mood", "Evaluate your mood", date);
      print("mood");
    }
    for (var date in sleepDates) {
      setNotification(1, "Sleep", "Evaluate your sleep", date);
      print("sleep");
    }
  }

  Future<void> setNotification(
      int id, String title, String body, TZDateTime tzDateTime) async {
    await flutterLocalNotificationsPlugin.zonedSchedule(
      id,
      title,
      body,
      tzDateTime, //schedule the notification to show after 2 seconds.
      const NotificationDetails(
        // Android details
        android: AndroidNotificationDetails('main_channel', 'Main Channel',
            channelDescription: "ashwin",
            importance: Importance.max,
            priority: Priority.max),
        // iOS details
        iOS: DarwinNotificationDetails(
          sound: 'default.wav',
          presentAlert: true,
          presentBadge: true,
          presentSound: true,
        ),
      ),

      // Type of time interpretation
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      androidAllowWhileIdle:
          true, // To show notification even when the app is closed
    );
  }
}