Give user chance to extend sleep timer when time's almost up

app/src/main/java/de/christinecoenen/code/zapp/app/player/AbstractPlayerActivity.kt

@@ -237,6 +237,10 @@ abstract class AbstractPlayerActivity :
 		}
 	}
 
+	override fun onTimerAlmostEnded() {
+		showSleepTimerBottomSheet()
+	}
+
 	override fun onTimerEnded() {
 		showSleepTimerBottomSheet()
 	}

app/src/main/java/de/christinecoenen/code/zapp/app/player/SleepTimer.kt

@@ -6,6 +6,7 @@ import java.time.Instant
 import java.util.*
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.seconds
 
 class SleepTimer(
 	private val onTimerEnded: () -> Unit
@@ -15,6 +16,10 @@ class SleepTimer(
 	private var timerEndTime: Instant? = null
 	private val listeners: WeakHashMap<Listener, Void> = WeakHashMap()
 
+	private val timerAlmostEndedRunnable = Runnable {
+		onTimerAlmostEnded()
+	}
+
 	private val timerEndedRunnable = Runnable {
 		onTimerEnded()
 		stop()
@@ -40,14 +45,19 @@ class SleepTimer(
 
 	fun start(duration: Duration) {
 		stop()
+
 		timerEndTime = Instant.now().plusMillis(duration.inWholeMilliseconds)
 		onIsRunningChanged()
+
+		val almostEndedDuration = duration.minus(10.seconds)
+		handler.postDelayed(timerAlmostEndedRunnable, almostEndedDuration.inWholeMilliseconds)
 		handler.postDelayed(timerEndedRunnable, duration.inWholeMilliseconds)
 	}
 
 	fun stop() {
 		timerEndTime = null
 		onIsRunningChanged()
+		handler.removeCallbacks(timerAlmostEndedRunnable)
 		handler.removeCallbacks(timerEndedRunnable)
 	}
 
@@ -64,6 +74,10 @@ class SleepTimer(
 		listeners.keys.forEach { it.onIsRunningChanged(isRunning) }
 	}
 
+	private fun onTimerAlmostEnded() {
+		listeners.keys.forEach { it.onTimerAlmostEnded() }
+	}
+
 	private fun onTimerEnded() {
 		onTimerEnded.invoke()
 		listeners.keys.forEach { it.onTimerEnded() }
@@ -71,6 +85,7 @@ class SleepTimer(
 
 	interface Listener {
 		fun onIsRunningChanged(isRunning: Boolean) {}
+		fun onTimerAlmostEnded() {}
 		fun onTimerEnded() {}
 	}
 }