cloudsolutions-atoms/lib/controllers/notification/notification_manger.dart

import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:timezone/timezone.dart' as tz;

class NotificationManger {
  // private constructor to avoid create object
  NotificationManger._();

  static late FlutterLocalNotificationsPlugin localNotificationsPlugin;

  /// initialisation setting for all platform
  /// onNotificationPressed action when notification pressed to open tap
  /// onIOSNotificationPressed action when notification pressed
  /// to open tap in iOS versions older than 10
  static Future<void> initialisation(Function(NotificationResponse) onNotificationPressed, DidReceiveLocalNotificationCallback onIOSNotificationPressed) async {
    final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
    // initialise the plugin. app_icon needs to be a added as a drawable resource to the Android head project
    const AndroidInitializationSettings initializationSettingsAndroid = AndroidInitializationSettings('@drawable/ic_stat_name');

    final DarwinInitializationSettings initializationSettingsDarwin = DarwinInitializationSettings(onDidReceiveLocalNotification: onIOSNotificationPressed);

    final InitializationSettings initializationSettings = InitializationSettings(android: initializationSettingsAndroid, iOS: initializationSettingsDarwin, macOS: initializationSettingsDarwin);
    localNotificationsPlugin = flutterLocalNotificationsPlugin;

    if (Platform.isIOS) {
      await localNotificationsPlugin.resolvePlatformSpecificImplementation<IOSFlutterLocalNotificationsPlugin>()?.requestPermissions(alert: true, badge: true, sound: true);
    } else if (Platform.isAndroid) {
      final AndroidFlutterLocalNotificationsPlugin? androidImplementation = localNotificationsPlugin.resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>();
      final bool granted = await androidImplementation?.requestNotificationsPermission() ?? false;
      print('permission value is $granted');
      if (!granted) {
        if (kDebugMode) {
          print("-------------------- Permission Granted ------------------------");
          print(granted);
        }
        await Permission.notification.request();
      }
    }

    await localNotificationsPlugin.initialize(initializationSettings, onDidReceiveNotificationResponse: onNotificationPressed);
  } // push new notification
  static const  AndroidNotificationDetails androidNotificationDetails = AndroidNotificationDetails(
    'com.hmg.atoms',
    'ATOMS',
    channelDescription: 'Push notification service for ATOMS',
    importance: Importance.max,
    priority: Priority.max,
    icon: "@drawable/ic_stat_name",
    playSound: true,
    channelShowBadge: true,
    visibility: NotificationVisibility.public,
    enableVibration: true,
    groupKey: 'com.hmg.atoms',
  );

  static const DarwinNotificationDetails iosNotificationDetails = DarwinNotificationDetails(
    categoryIdentifier: "atoms",
  );

  static Future<void> showNotification({required BuildContext context, required String title, required String subtext, required int hashcode, String? payload}) async {
    // const AndroidNotificationDetails androidChannel = AndroidNotificationDetails(
    //   'com.hmg.atoms',
    //   'ATOMS',
    //   channelDescription: 'Push notification service for ATOMS',
    //   importance: Importance.max,
    //   priority: Priority.max,
    //   icon: "@drawable/ic_stat_name",
    //   playSound: true,
    //   channelShowBadge: true,
    //   visibility: NotificationVisibility.public,
    //   enableVibration: true,
    //   groupKey: 'com.hmg.atoms',
    // );


    // const DarwinNotificationDetails iosNotificationDetails = DarwinNotificationDetails(
    //   categoryIdentifier: "atoms",
    // );

    const NotificationDetails platformChannel = NotificationDetails(android: androidNotificationDetails, iOS: iosNotificationDetails, macOS: iosNotificationDetails);

    await localNotificationsPlugin.show(hashcode, title, subtext, platformChannel, payload: payload);
  }

  static Future scheduleNotification(
      {int?id,
        String? title,
        String? body,
        String? payLoad,
        required DateTime scheduledNotificationDateTime}) async {

    print('time i got is ${scheduledNotificationDateTime}');
    return localNotificationsPlugin.zonedSchedule(
        id??0,
        title,
        body,
        // tz.TZDateTime.now(tz.local).add(const Duration(seconds: 5)),
        tz.TZDateTime.from(
          scheduledNotificationDateTime,
          tz.local,
        ),
         const NotificationDetails(android: androidNotificationDetails, iOS: iosNotificationDetails, macOS: iosNotificationDetails),
        androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
        uiLocalNotificationDateInterpretation:
        UILocalNotificationDateInterpretation.absoluteTime);
  }
  static Future<void> cancelNotificationById(int notificationId) async {
    await localNotificationsPlugin.cancel(notificationId);
    print("Notification with ID $notificationId has been canceled.");
  }
}