Challenge 1: A Notification Channel and a Notification — Solution

fun createTaskReminderChannel(context: Context) {
    val channel = NotificationChannel(
        "task_reminders",
        "Task Reminders",
        NotificationManager.IMPORTANCE_DEFAULT
    ).apply {
        description = "Reminders about your upcoming tasks"
    }

    val notificationManager = context.getSystemService(NotificationManager::class.java)
    notificationManager.createNotificationChannel(channel)
}

fun showTaskReminder(context: Context, taskTitle: String) {
    val notification = NotificationCompat.Builder(context, "task_reminders")
        .setSmallIcon(R.drawable.ic_task)
        .setContentTitle("Task Reminder")
        .setContentText(taskTitle)
        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
        .build()

    if (ContextCompat.checkSelfPermission(context, Manifest.permission.POST_NOTIFICATIONS)
        == PackageManager.PERMISSION_GRANTED) {
        NotificationManagerCompat.from(context).notify(TASK_REMINDER_NOTIFICATION_ID, notification)
    }
}

Notes:
- createTaskReminderChannel should be called once, early in the app's
  lifecycle (e.g. inside the Application class's onCreate, per Course 2
  Chapter 5's @HiltAndroidApp setup) — creating the same channel ID
  again later is a safe no-op, not an error.
- The "task_reminders" string passed to NotificationCompat.Builder must
  match the channel ID used in createTaskReminderChannel exactly — a
  mismatched or non-existent channel ID means the notification either
  fails to show or falls back to default (unconfigured) behavior.
- The permission check before .notify(...) is not optional — omitting it
  would crash the app with a SecurityException on Android 13+ if the
  permission hasn't been granted, exactly as the chapter warned.