class_name AudioFactory
extends RefCounted
## Factory condivisa per suoni procedurali morbidi e sensory-friendly.


static func create_tone(freq: float, duration: float, amp: float = 0.3) -> AudioStreamWAV:
	var sample_rate := 22050
	var num_samples := int(sample_rate * duration)
	var data := PackedByteArray()
	data.resize(num_samples)
	var attack := int(sample_rate * 0.01)
	for i in num_samples:
		var t := float(i) / sample_rate
		var env := 1.0
		if i < attack:
			env = float(i) / attack
		env *= exp(-3.0 * t / duration)
		var value := int(clampf(sin(t * freq * TAU) * env * amp * 127.0, -128.0, 127.0))
		data[i] = value & 0xff
	var stream := AudioStreamWAV.new()
	stream.format = AudioStreamWAV.FORMAT_8_BITS
	stream.mix_rate = sample_rate
	stream.data = data
	return stream


static func create_arpeggio(freqs: Array[float], note_duration: float = 0.12, amp: float = 0.3) -> AudioStreamWAV:
	var sample_rate := 22050
	var samples_per_note := int(sample_rate * note_duration)
	var data := PackedByteArray()
	data.resize(samples_per_note * freqs.size())
	var index := 0
	var attack := int(sample_rate * 0.01)
	for freq in freqs:
		for i in samples_per_note:
			var t := float(i) / sample_rate
			var env := 1.0
			if i < attack:
				env = float(i) / attack
			env *= exp(-3.0 * t / note_duration)
			var value := int(clampf(sin(t * freq * TAU) * env * amp * 127.0, -128.0, 127.0))
			data[index] = value & 0xff
			index += 1
	var stream := AudioStreamWAV.new()
	stream.format = AudioStreamWAV.FORMAT_8_BITS
	stream.mix_rate = sample_rate
	stream.data = data
	return stream


static func play_once(parent: Node, stream: AudioStream, volume_db: float = 0.0) -> AudioStreamPlayer:
	var player := AudioStreamPlayer.new()
	player.stream = stream
	player.volume_db = volume_db
	parent.add_child(player)
	player.finished.connect(player.queue_free)
	player.play()
	return player