NotificationUtils

class  NotificationUtils(base: Context) : ContextWrapper(base) {

    val MYCHANNEL_ID = "App Alert Notification ID"
    val MYCHANNEL_NAME = "App Alert Notification"

    private var manager: NotificationManager? = null

    init {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            createChannels()
        }
    }

    // Create channel for Android version 26+
    @TargetApi(Build.VERSION_CODES.O)
    private fun createChannels() {
        val channel = NotificationChannel(MYCHANNEL_ID, MYCHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH)
        channel.enableVibration(true)

        getManager().createNotificationChannel(channel)
    }

    // Get Manager
    fun getManager() : NotificationManager {
        if (manager == null) manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        return manager as NotificationManager
    }

    fun getNotificationBuilder(): NotificationCompat.Builder {
        val intent = Intent(this, MainActivity::class.java).apply {
            flags = Intent.FLAG_ACTIVITY_CLEAR_TASK
        }
        val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)
        return NotificationCompat.Builder(applicationContext, MYCHANNEL_ID)
            .setContentTitle("Alarm!")
            .setContentText("Your AlarmManager is working.")
            .setSmallIcon(R.drawable.ic_alarm_blue)
            .setColor(Color.YELLOW)
            .setContentIntent(pendingIntent)
            .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
            .setAutoCancel(true)
    }
}