#pragma once
#include <iostream>
#include <Windows.h>
#include <mmsystem.h>
#include <thread>
#include <chrono>
#include"AudioSource.h"
#include"AudioConfig.h"

#pragma comment(lib, "winmm.lib")

class AudioEngine
{
public:
	AudioEngine();
	~AudioEngine();
	void Update(double p_deltaTime);
	void InitAudioEngine();
	void ExitAudioEngine();
	void SubmitSource(AudioSource* p_audioSource);

private:
	MMRESULT InitAudioThread();
	void InitWavFormat();
	MMRESULT InitDevice();
	MMRESULT InitWavHeader();
	MMRESULT PlayFrontData();
	void PrepareBackData();
	void SwapBuffer();
	void OnAudioCallback(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2);
	static void CALLBACK StaticAudioCallback(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2);

private:
	bool m_isRunning = false;								//音频引擎是否开启
	std::thread  m_audioThread;								//音频数据处理线程
	AudioSource* m_audioSource{ nullptr };					//TODO::每次play的时候都得增加一个
	short m_audioBuffer1[AUDIO_BUFFER_SIZE] = { 0 };		//音频缓冲区1
	short m_audioBuffer2[AUDIO_BUFFER_SIZE] = { 0 };		//音频缓冲区2
	bool m_isBuffer1Front = true;							//标记哪个缓冲区为front			
	bool m_isFBufferUsing = false;							//FBuffer-Front Buffer
	bool m_isBBufferPrepared = false;						//BBuffer-Back Buffer
	HWAVEOUT m_hWaveOut;									//正在使用的音频设备
	WAVEFORMATEX m_waveFormat;					
	WAVEHDR m_waveHeader1;
	WAVEHDR m_waveHeader2;
	std::vector<WAVEOUTCAPS> m_waveOutCaps;					//可用音频设备
};