extends Node

# Dependency-free audio foundation. Authored assets can replace these tones
# later without changing gameplay call sites or the multiplayer event flow.

const SAMPLE_RATE := 44100
const MAX_INTENSITY := 1.0

var enabled := true


func bind_tree_buttons(root: Node) -> void:
	if root == null:
		return
	for node in root.find_children("*", "BaseButton", true, false):
		bind_button(node as BaseButton)


func bind_button(button: BaseButton) -> void:
	if button == null:
		return
	var callback := Callable(self, "play_ui_click")
	if not button.pressed.is_connected(callback):
		button.pressed.connect(callback)


func play_ui_click() -> void:
	_play_tone(880.0, 0.045, 0.10)


func play_countdown(count: int) -> void:
	if count <= 0:
		_play_tone(1046.5, 0.12, 0.18)
	else:
		_play_tone(countdown_frequency(count), 0.08, 0.14)


func play_impact(intensity: float) -> void:
	var amount := clamp_intensity(intensity)
	if amount <= 0.0:
		return
	_play_tone(150.0 + 180.0 * amount, 0.06 + 0.08 * amount, 0.08 + 0.18 * amount)


func play_goal() -> void:
	_play_tone(523.25, 0.22, 0.22)
	_play_tone(783.99, 0.30, 0.18)


static func clamp_intensity(value: float) -> float:
	if not is_finite(value):
		return 0.0
	return clampf(value, 0.0, MAX_INTENSITY)


static func countdown_frequency(count: int) -> float:
	return 440.0 + float(clampi(count, 1, 9)) * 55.0


func _play_tone(frequency: float, duration: float, volume: float) -> void:
	if not enabled or frequency <= 0.0 or duration <= 0.0 or volume <= 0.0:
		return
	var stream := AudioStreamWAV.new()
	stream.format = AudioStreamWAV.FORMAT_16_BITS
	stream.mix_rate = SAMPLE_RATE
	stream.stereo = false
	stream.data = _tone_data(frequency, duration, volume)
	var player := AudioStreamPlayer.new()
	player.stream = stream
	add_child(player)
	player.finished.connect(player.queue_free)
	player.play()


func _tone_data(frequency: float, duration: float, volume: float) -> PackedByteArray:
	var frames := maxi(1, int(duration * SAMPLE_RATE))
	var data := PackedByteArray()
	data.resize(frames * 2)
	for index in frames:
		var envelope := minf(1.0, float(index) / 256.0) * minf(1.0, float(frames - index) / 1024.0)
		var sample := int(sin(TAU * frequency * float(index) / SAMPLE_RATE) * volume * envelope * 32767.0)
		if sample < 0:
			sample += 65536
		data[index * 2] = sample & 0xff
		data[index * 2 + 1] = (sample >> 8) & 0xff
	return data