extends Node

signal speech_recognition_successed

## 录音效果器
var effect: AudioEffectRecord
## 录音捕获效果器（用于判断录音音量）
var capture: AudioEffectCapture


func _ready():
	# We get the index of the "Record" bus.
	var idx = AudioServer.get_bus_index("Record")
	# And use it to retrieve its first effect, which has been defined
	# as an "AudioEffectRecord" resource.
	effect = AudioServer.get_bus_effect(idx, 0)
	capture = AudioServer.get_bus_effect(idx, 1)

## 启动录音
func startRecord():
	print("启动录音")
	if not effect.is_recording_active():
		effect.set_recording_active(true)


## 停止录音
func stopRecord():
	if effect.is_recording_active():
		effect.set_recording_active(false)

var audio_sd = preload("res://Assets/training_speech/sd.mp3")
var audio_zlgzmhfzc = preload("res://Assets/training_speech/zlgzmhfzc.mp3")


## 播放回复
## PS: 是协程函数，外部可以await
func play_reply(reply):
	if reply == null:
		return
	stopRecord()
	assert(reply is AudioStream, "reply不是音频资源")
	## 确保不循环播放
	if reply is AudioStreamMP3:
		reply.loop = false
	if reply is AudioStreamOggVorbis:
		reply.loop = false
	if reply is AudioStreamWAV:
		reply.loop_mode = AudioStreamWAV.LOOP_DISABLED
	$AudioStreamPlayer.stream = reply
	$AudioStreamPlayer.play()
	await $AudioStreamPlayer.finished

## 录音并语音识别检查
## PS: 是协程函数，外部如果关心结果需await
func speech_record_check(keywords):
	startRecord()
	$Timer.start()
	await speech_recognition_successed
	$Timer.stop()
	stopRecord()

## 长时间没有说话阈值
const VolumeMin = 0.05
const LongTimeNoVoice = 1.5
var novoiceTime = 0

func _on_timer_timeout():
	if effect.is_recording_active():
		print(capture.get_buffer_length_frames(), ", ", capture.get_discarded_frames(), ", ", capture.get_frames_available())
		var buf = capture.get_buffer(capture.get_frames_available())
		var hasvoice = false
		for vec in buf:
			if vec.x > VolumeMin or vec.y > VolumeMin:
				#print("Left channel volume = ", vec.x, ", Right volume = ", vec.y)
				hasvoice = true
		if hasvoice:
			if novoiceTime > LongTimeNoVoice:
				novoiceTime = 0
				## 重新开始录音
				stopRecord()
				startRecord()
		else:
			novoiceTime += $Timer.wait_time
			if novoiceTime >= LongTimeNoVoice:
				print("长时间没有说话: ", novoiceTime)
				var rcd = effect.get_recording()
				stopRecord()
				await play_reply(rcd)
				if rcd.get_length() > 5:
					speech_recognition_successed.emit()
				else:
					startRecord()
	#if effect.is_recording_active():
		#recording = effect.get_recording()
		#print(recording.data.size(), ", ", recording.format, ", ", recording.loop_mode, ", ", recording.get_length())
		#stopRecord()
		#var player = AudioStreamPlayer.new()
		#add_child(player)
		#player.stream = recording
		#player.play()
		#player.finished.connect( _on_audio_play_finished.bind(player))
		#startRecord()


func _on_audio_play_finished(player):
	print(player, "播放完成")
	player.stop()
	player.queue_free()
	pass