class_name P91AudioAdapter
extends RefCounted

var player: AudioStreamPlayer
var playback: AudioStreamGeneratorPlayback

func attach(parent: Node) -> void:
	var generator := AudioStreamGenerator.new()
	generator.mix_rate = 22050.0
	generator.buffer_length = 0.25
	player = AudioStreamPlayer.new()
	player.name = "PrototypeSFX"
	player.bus = &"SFX"
	player.playback_type = AudioServer.PLAYBACK_TYPE_STREAM
	player.stream = generator
	parent.add_child(player)
	player.play()
	playback = player.get_stream_playback()

func cleanup() -> void:
	if player != null:
		player.stop()
		player.stream = null
		if is_instance_valid(player):
			player.free()
	playback = null
	player = null

func play(kind: StringName, muted: bool) -> void:
	if muted or playback == null:
		return
	var frequency: float = {
		&"select": 360.0, &"confirm": 440.0, &"depart": 300.0,
		&"hit": 180.0, &"role": 540.0, &"victory": 680.0,
	}.get(kind, 400.0)
	var duration := 0.13 if kind in [&"hit", &"victory"] else 0.08
	var frames := int(22050.0 * duration)
	for index in range(frames):
		var envelope := sin(PI * float(index) / float(frames)) * 0.035
		var value := sin(TAU * frequency * float(index) / 22050.0) * envelope
		playback.push_frame(Vector2(value, value))