extends Node

# SoundManager - Autoload singleton for all SFX

var _bus_sfx := 0

func _ready() -> void:
	_bus_sfx = AudioServer.get_bus_index("Master")

func play_sfx(sfx_name: String) -> void:
	match sfx_name:
		"player_shoot":    _play_tone(880.0, 0.07, "sine", -18.0, 440.0)
		"enemy_shoot":     _play_tone(220.0, 0.09, "saw",  -20.0, 110.0)
		"enemy_die":       _play_noise(0.2, -16.0); _play_tone(180.0, 0.15, "square", -18.0, 60.0)
		"player_die":      _play_noise(0.8, -14.0); _play_tone(120.0, 0.8,  "sine",   -16.0, 30.0)
		"antimatter_hit":  _play_tone(1200.0, 0.3, "saw", -16.0, 300.0); _play_noise(0.2, -18.0)
		"bh_swallow":      _play_tone(200.0, 0.22, "sine", -20.0, 40.0)
		"wipe_start":      _play_tone(35.0, 2.3, "sine", -22.0, 35.0)
		"wipe_flash":      _play_noise(0.4, -16.0); _play_tone(80.0, 0.6, "sine", -18.0, 20.0)
		"wipe_survived":   _play_chord_fanfare()
		"smbh_spawn":      _play_tone(60.0, 1.0, "sine", -18.0, 20.0); _play_noise(0.5, -16.0)
		"quasar_boost":    _play_tone(280.0, 0.45, "sine", -15.0, 1500.0); _play_noise(0.15, -22.0)
		"antimatter_swarm":_play_noise(0.28, -18.0)

func _play_tone(freq: float, duration: float, wave: String, vol_db: float, end_freq: float) -> void:
	var gen := AudioStreamGenerator.new()
	gen.mix_rate = 44100.0
	gen.buffer_length = duration
	var player := AudioStreamPlayer.new()
	player.stream = gen
	player.volume_db = vol_db
	player.autoplay = false
	add_child(player)
	player.play()
	var playback: AudioStreamGeneratorPlayback = player.get_stream_playback()
	var frames := int(44100.0 * duration)
	var phase := 0.0
	for i in frames:
		var t := float(i) / float(frames)
		var cur_freq := freq + (end_freq - freq) * t
		phase += cur_freq / 44100.0
		var s := 0.0
		match wave:
			"sine":   s = sin(phase * TAU)
			"saw":    s = fmod(phase, 1.0) * 2.0 - 1.0
			"square": s = 1.0 if sin(phase * TAU) > 0 else -1.0
		var env := 1.0 - t
		playback.push_frame(Vector2(s * env, s * env))
	var timer := get_tree().create_timer(duration + 0.1)
	timer.timeout.connect(player.queue_free)

func _play_noise(duration: float, vol_db: float) -> void:
	var gen := AudioStreamGenerator.new()
	gen.mix_rate = 44100.0
	gen.buffer_length = duration
	var player := AudioStreamPlayer.new()
	player.stream = gen
	player.volume_db = vol_db
	add_child(player)
	player.play()
	var playback: AudioStreamGeneratorPlayback = player.get_stream_playback()
	var frames := int(44100.0 * duration)
	for i in frames:
		var t := float(i) / float(frames)
		var s := randf_range(-1.0, 1.0) * (1.0 - t)
		playback.push_frame(Vector2(s, s))
	var timer := get_tree().create_timer(duration + 0.1)
	timer.timeout.connect(player.queue_free)

func _play_chord_fanfare() -> void:
	var freqs: Array[float] = [261.6, 329.6, 392.0]
	for i in freqs.size():
		var delay_timer := get_tree().create_timer(i * 0.06)
		var f: float = freqs[i]
		delay_timer.timeout.connect(func(): _play_tone(f, 0.4, "sine", -16.0, f))