// Sample Flutter code for cross-platform in-app notification
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';

void showInAppNotification() {
  Fluttertoast.showToast(
    msg: 'Flash sale alert!',
    toastLength: Toast.LENGTH_SHORT,
    gravity: ToastGravity.BOTTOM,
    timeInSecForIosWeb: 1,
    backgroundColor: Colors.blue,
    textColor: Colors.white,
    fontSize: 16.0,
  );
}

// Customizable in-app notification with Flutter
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

void showCustomInAppNotification() async {
  var android = AndroidNotificationDetails(
    'channel_id',
    'channel_name',
    'channel_description',
    priority: Priority.high,
    importance: Importance.max,
  );
  var iOS = IOSNotificationDetails();
  var platform = NotificationDetails(android: android, iOS: iOS);
  await FlutterLocalNotificationsPlugin().show(
    0,
    'Custom Notification',
    'This is a custom in-app notification',
    platform,
  );
}

// Flutter code with Hot Reload for in-app notification
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter In-App Notifications'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            // Hot Reload allows instant code changes
            showInAppNotification();
          },
          child: Text('Show In-App Notification'),
        ),
      ),
    );
  }

  void showInAppNotification() {
    // Code for in-app notification
  }
}

// Flutter code for Firebase Cloud Messaging in-app notification
import 'package:firebase_messaging/firebase_messaging.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging.instance;

  @override
  Widget build(BuildContext context) {
    _firebaseMessaging.subscribeToTopic('all');
    return Scaffold(
      appBar: AppBar(
        title: Text('FCM In-App Notification'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            // Function to trigger FCM in-app notification
          },
          child: Text('Show FCM In-App Notification'),
        ),
      ),
    );
  }
}

// Flutter code for cost-effective in-app notification
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Cost-Effective In-App Notification'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            // Functionality for cost-effective in-app notification
          },
          child: Text('Show Cost-Effective In-App Notification'),
        ),
      ),
    );
  }
}