#pragma once

#include "audio/ALAudioSystem.h"
#include "audio/ALAudioSource.h"
#include "audio/ALListener.h"

#include "AudioDef.h"


typedef int GSID;

class CAudioInterface
{
	struct Source
	{
		AudioSource* NiSource;
		DWORD IdelTime;				// if IdelTime > 0 表示已经处于空闲状态.
	};
	enum
	{
		MUSIC_FADE_TIME = 200, // 200 ms 
		MAX_SOURCES = 64,
		MAX_UISOURCE =32,
	};
public:
	CAudioInterface(void);
	~CAudioInterface(void);
	BOOL Initialize(HWND hWnd);
	void Destroy();
	void ReleaseAllSource();
	void ReleaseIdelSource();
	// Note : 我们目前只支持简单的3D,2d 音效, 也就是说, 忽略多声源普勒效应, Cone 等. 
	int PlaySound(GSID id, const NiPoint3& Pos = NiPoint3::ZERO, float Volumn = 1.0f, int LoopCount = 1);
	int PlaySound(const char* Name, const NiPoint3& Pos = NiPoint3::ZERO, float Volumn = 1.0f, int loopcount = 1);
	AudioSourcePtr Play3DSound(const char* szName, const NiTransform& kLocalTransform, float fMinDistance, float fMaxDistance, float Volumn = 1.0f, int loopcount = 1);
	int PlayMusic(const char* Name, int LoopCnt = 1);
	int PlaySound(AudioSource* voice, const char* szName);
	int PlaySoundByList( AudioSource* voice, const char* szName );

	void PlayUiSound( GSID id, const NiPoint3& Pos = NiPoint3::ZERO, float Volumn = 1.0f, int loopcount = 1 );
	void PlayUiSound( const char* Name, const NiPoint3& Pos = NiPoint3::ZERO, float Volumn = 1.0f, int loopcount = 1 );
	void StopSound(int Index);
	void OnlyPlaySound(int Index);
	void StopAllSound();
	void Update(DWORD dt);

	void OnArea(unsigned int uiAreaID);
	void SetSoundStateChangedCBFn(int index, AudioSource::StateChangedCallBack fn, AudioSource::Status eStatus = AudioSource::NOT_SET);

	BOOL IsPlaying(INT Index) const;
	// 查找声音句柄, 返回句柄索引, 如果没有找到则返回 -1.
	int FindSound(const NiFixedString& BufferName);
	BOOL ReleaseSource(INT Index);

	void SetListenerNode(NiNode* pkNode);

	// media
	void Register(GSID id, const NiString& fn);
	void RegisterZoneMusic(unsigned int zoneid, const NiString& fn);
	void RegisterMapMusic(unsigned int mapid, const NiString& fn);
	void ChangeMapMusic( const NiString& fn );

	void PreLoad( int areaId );
	void PreLoadAll();

	NiFixedString GetSoundFile(GSID sid) const;
	NiFixedString GetZoneMusic(unsigned int zoneid) const;
	NiFixedString GetMapMusic(unsigned int zoneid) const;
protected:
	void LoadMedia();

	BOOL _PlaySound(int Index, const NiPoint3& Pos, float Volumn = 1.0f);
	BOOL _PlaySound(int Index);

	AudioSource* GetSource(int iIndex);

protected:
	INT GetFreeSourceIndex();
	void QueryMusicState();
	void RandomPlayMusic();
protected:
	class AudioSystem* m_AudioSystem;
	float m_MasterVolumn;
	float m_AmbientVolumn;
	float m_EffectVolumn;
	DWORD m_MusicRestartTime;			// 
	AudioSource* m_CurrentMusic;		// 目前只支持1个

	bool m_bInit;

	AudioSourcePtr m_Sources[MAX_SOURCES];		// 这种做法本身不是安全的, 因为在所有声卡上, 有效的声源个数是有硬件限制的.
				// AC'97芯片大多数都是支持32个, DSOUND 驱动可以支持64个(software render to surface.).  但不管怎么, 都是有限制, MSS 如何处理
				// 目前不得而知, 所以也不好确定NIMilesAudio 的处理是否正确, 但愿AudioSource其实只是表示一个缓冲, 而且
				// MSS 会自适应地分配声源. 

	AudioSourcePtr m_UiSources[MAX_UISOURCE];

	FixedStringHashMap<int> m_SourceMap;
	typedef FixedStringHashMap<int>::value_type SourcePair;

	NiTMap<GSID, NiFixedString> m_SMMap;
	NiTMap<unsigned int, NiFixedString> m_ZoneM;
	NiTMap<unsigned int, NiFixedString> m_MapM;

	unsigned int m_curActZoneID;
	unsigned int m_curZoneID;
	int m_curActMapId;
	float m_fNextTime;

	std::list< NiFixedString >  m_listMusic;
	
};

inline int CAudioInterface::FindSound(const NiFixedString& BufferName)
{
	NIASSERT(BufferName);
	FixedStringHashMap<int>::const_iterator it = m_SourceMap.find(BufferName);
	if (it != m_SourceMap.end())
	{
		return it->second;
	}
	return -1;
}

inline INT CAudioInterface::GetFreeSourceIndex()
{
	int i;
	for (i = 0; i < MAX_SOURCES; i++)
	{
		if (m_Sources[i] == NULL)
		{
			return i;
		}
	}
	
	// 所有缓冲区均被占用, 尝试释放一个已经停止播放的.
	if (i == MAX_SOURCES)
	{
		for (int j = 0; j < MAX_SOURCES; j++)
		{
			if(!IsPlaying(j) && ReleaseSource(j))
			{
				return j;
			}
		}
	}
	
	// 强制释放 0 !!!! 
	ReleaseSource(0);
	return 0;
}