public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = MyFirebaseMessagingService.class.getSimpleName();


    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        Log.e(TAG, "From: " + remoteMessage.getFrom());

        if (remoteMessage == null)
            return;

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
handleNotification(remoteMessage.getNotification().getBody());
            showSimpleMsg(remoteMessage.getNotification());
        }

        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            try {
                JSONObject json = new JSONObject(remoteMessage.getData());
                storeNotificationToPreferences(remoteMessage.getNotification().getTitle(), remoteMessage.getNotification().getBody(),
                        json);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    private void showSimpleMsg(RemoteMessage.Notification notification) {
        Intent pushNotification = new Intent(Config.PUSH_NOTIFICATION);
        pushNotification.putExtra("message", notification.getBody());
        LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);

        showNotificationMessage(getApplicationContext(), notification.getTitle(), notification.getBody());
    }

    private void handleNotification(String message) {
        if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
            // app is in foreground, broadcast the push message
            Intent pushNotification = new Intent(Config.PUSH_NOTIFICATION);
            pushNotification.putExtra("message", message);
            LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);

            // play notification sound
            NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
            notificationUtils.playNotificationSound();
        } else {
            // If the app is in background, firebase itself handles the notification
        }
    }


    private void showNotificationMessage(Context context, String title, String message) {


        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            Intent intent = new Intent(getApplicationContext(), MainActivity.class);
            String CHANNEL_ID = "olonce";
            NotificationChannel notificationChannel = null;
            notificationChannel = new NotificationChannel(CHANNEL_ID, "olonce", NotificationManager.IMPORTANCE_LOW);
            PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 1, intent, 0);
            Notification notification = new Notification.Builder(getApplicationContext(), CHANNEL_ID)
                    .setContentText(message)
                    .setContentTitle(title)
                    .setContentIntent(pendingIntent)
                    .setChannelId(CHANNEL_ID)
                    .setSmallIcon(R.mipmap.ic_launcher)

                    .build();

            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(notificationChannel);
            notificationManager.notify(1, notification);
        } else {
            Intent intent = new Intent(getApplicationContext(), MainActivity.class);

            PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 1, intent, 0);
            Notification notification = new Notification.Builder(getApplicationContext())
                    .setContentText(message)
                    .setContentTitle(title)
                    .setContentIntent(pendingIntent)
                    .setSmallIcon(R.mipmap.ic_launcher)

                    .build();

            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.notify(1, notification);
        }
    }


    private void storeNotificationToPreferences(String title, String message,JSONObject extraData) {
        SharedPreferences preferences = getApplicationContext().getSharedPreferences("Notifications", MODE_PRIVATE);

        try {
            //Default Data
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("data", new JSONArray());
            jsonObject.put("unread", 0);

            JSONObject oldData = new JSONObject(preferences.getString("notifications", jsonObject.toString()));
            JSONArray data = oldData.getJSONArray("data");
            data.put(new JSONObject().put("title", title).put("message", message).put("data",extraData));

            int unread = (oldData.has("unread") ? oldData.getInt("unread") : 0) + 1;
            oldData.put("unread", unread);

            SharedPreferences.Editor editor = preferences.edit();
            editor.remove("notifications");
            editor.putString("notifications", oldData.toString());
            editor.commit();

            EventBus.getDefault().post(Common.EVENTS.NOTIFICATION);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}