import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

const AndroidNotificationChannel channel = AndroidNotificationChannel(
    'high_importance_channel', // id
    'High Importance Notifications', // title
    description: 'This channel is used for important notifications.', // description
    importance: Importance.high,
    playSound: true);

// flutter local notification
final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();

// firebase background message handler
Future _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  print('A Background message just showed up :  ${message.messageId}');
}

Future main() async {
  // firebase App initialize
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

// Firebase local notification plugin
  await flutterLocalNotificationsPlugin
      .resolvePlatformSpecificImplementation<
          AndroidFlutterLocalNotificationsPlugin>()
      ?.createNotificationChannel(channel);

//Firebase messaging
  await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
    alert: true,
    badge: true,
    sound: true,
  );

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Push Notification',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Push Notification'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, title}) : super(key: key);

  final String title = "";

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {
  int _counter = 0;

  @override
  void initState() {
    super.initState();

    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      RemoteNotification? notification = message.notification;
      AndroidNotification? android = message.notification?.android;
      if (notification != null && android != null) {
        flutterLocalNotificationsPlugin.show(
            notification.hashCode,
            notification.title,
            notification.body,
            NotificationDetails(
              android: AndroidNotificationDetails(
                channel.id,
                channel.name,
                channelDescription : channel.description,
                color: Colors.blue,
                playSound: true,
                icon: '@mipmap/ic_lancher',
              ),
            ));
      }
    });

    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
      print('A new messageopen app event was published');
      RemoteNotification? notification = message.notification;
      AndroidNotification? android = message.notification?.android;
      if (notification != null && android != null) {
        showDialog(
            context: context,
            builder: (_) {
              return AlertDialog(
                title: Text("${notification.title}"),
                content: SingleChildScrollView(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [Text("${notification.body}")],
                  ),
                ),
              );
            });
      }
    });
  }

  void showNotification() {
    setState(() {
      _counter++;
    });

    flutterLocalNotificationsPlugin.show(
        0,
        "Testing $_counter",
        "This is an Flutter Push Notification",
        NotificationDetails(
            android: AndroidNotificationDetails(channel.id, channel.name,
                channelDescription: channel.description,
                importance: Importance.high,
                color: Colors.blue,
                playSound: true,
                icon: '@mipmap/ic_launcher')));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'This is Flutter Push Notification Example',
            ),
            // Text(
            //   '$_counter',
            //   style: Theme.of(context).textTheme.headline4,
            // ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: showNotification,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}