redef class PlayableAudio

	redef var error = null

	private var native: nullable AVAudioPlayer is lazy do

		# Find file
		var ns_path = ("assets"/path).to_nsstring
		var url_in_bundle = asset_url(ns_path)
		if url_in_bundle.address_is_null then
			self.error = new Error("Sound at '{path}' not found")
			return null
		end

		var player = new AVAudioPlayer.contents_of(url_in_bundle)
		# TODO set delegate to get further errors
		if player.address_is_null then
			self.error = new Error("Sound at '{path}' failed to load")
			return null
		end

		player.prepare_to_play

		return player
	end

	redef fun load do native # For lazy loading

	redef fun play
	do
		var native = native
		if native != null then native.play_and_repare_async
	end

	# Free native resources
	fun destroy
	do
		var native = native
		if native != null then native.release
	end
end

redef class PlayableAudio
	redef var error = null

	# Real file system path to this asset
	private fun fs_path: String do return app.assets_dir / path

	# Does `fs_path` exist?
	private fun fs_path_exists: Bool
	do
		if not fs_path.file_exists then
			error = new Error("Failed to load audio '{path}': file not found")
			return false
		end
		return true
	end
end

redef class PlayableAudio
	# Flag to know if the user paused the sound
	# Used when the app pause all sounds or resume all sounds
	var paused: Bool = false

	# Is `self` already loaded?
	protected var is_loaded = false is writable

	redef var error = null
end