extends Node
const FILES := {"shot":"shoot", "invader":"invaderkilled", "death":"explosion", "march0":"fastinvader1", "march1":"fastinvader2", "march2":"fastinvader3", "march3":"fastinvader4", "ufo_hit":"ufo_highpitch"}
var tracks: Dictionary = {}
var voices: Array[AudioStreamPlayer] = []
var next_voice := 0
var saucer: AudioStreamPlayer
func _ready() -> void:
	for key in FILES: tracks[key] = load("res://games/space_invaders/audio/%s.wav"%FILES[key])
	for i in range(8):
		var voice := AudioStreamPlayer.new()
		voice.volume_db = -12
		add_child(voice)
		voices.append(voice)
	saucer = AudioStreamPlayer.new()
	saucer.stream = load("res://games/space_invaders/audio/ufo_lowpitch.wav")
	saucer.volume_db = -16
	add_child(saucer)
	saucer.finished.connect(func():
		if get_parent().saucer_active and not get_parent().demo and get_parent().phase=="play": saucer.play())
func effect(key: String) -> void:
	if get_parent().demo or not get_parent().sound_enabled or not tracks.has(key): return
	var voice := voices[next_voice]
	next_voice = (next_voice+1)%voices.size()
	voice.stream = tracks[key]
	voice.play()
func ufo(active: bool) -> void:
	if not active:
		saucer.stop()
	elif not get_parent().demo and get_parent().sound_enabled:
		saucer.play()
func stop_all() -> void:
	for voice in voices: voice.stop()
	if saucer: saucer.stop()