/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
#ifndef hsTimer_Defined
#define hsTimer_Defined

#include "hsWide.h"
#include "hsScalar.h"

#if !HS_CAN_USE_FLOAT
#error "Unsupported without double's"
#endif // !HS_CAN_USE_FLOAT

class plTimerShare
{
protected:
	mutable hsBool		fFirstTime;
	mutable hsWide		fRawTimeZero;
	mutable hsBool		fResetSmooth;

	enum {
		kSmoothBuffLen = 10
	};
	double				fSmoothBuff[kSmoothBuffLen];
	int					fCurrSlot;

	hsScalar			fSysTimeScale;
	double				fRealSeconds;
	double				fSysSeconds;
	hsScalar			fDelSysSeconds;
	hsScalar			fFrameTimeInc;
	hsBool				fRunningFrameTime;
	hsScalar			fTimeClampSecs;
	hsScalar			fSmoothingClampSecs;
	hsBool				fClamping;

	hsWide*				FactorInTimeZero(hsWide* ticks) const;

	double				GetSeconds() const;
	double				GetMilliSeconds() const;

	hsWide*				GetRawTicks(hsWide* ticks) const;

	double				RawTicksToDSeconds(const hsWide& ticks);
	hsWide				DSecondsToRawTicks(double secs);

	hsScalar			GetDelSysSeconds() const { return fDelSysSeconds; }
	double				GetSysSeconds() const { return fSysSeconds; }
	double				IncSysSeconds();

	void				SetRealTime(hsBool realTime);
	hsBool				IsRealTime() const { return !fRunningFrameTime; }

	void				SetFrameTimeInc(hsScalar inc) { fFrameTimeInc = inc; }

	void				SetTimeScale(hsScalar s) { fSysTimeScale = s; }
	hsScalar			GetTimeScale() const { return fSysTimeScale; }

	void				SetTimeClamp(hsScalar secs) { fTimeClampSecs = secs; }
	void				SetSmoothingCap(hsScalar secs) { fSmoothingClampSecs = secs; }
	hsScalar			GetTimeClamp() const { return fTimeClampSecs; }
	hsBool				IsClamping() const { return fClamping; }

	friend class hsTimer;
public:
	plTimerShare();
	~plTimerShare();
};

class hsTimer 
{
protected:
	static const double				fPrecTicksPerSec;
	static const hsWide				fRawBase;

	static	hsWide					IInitRawBase();
	
	static plTimerShare*			fTimer;
public:

	static hsBool	VerifyRawBase() { return fRawBase == IInitRawBase(); }
	static	const hsWide&		GetRawBase() { return fRawBase; }

	static	hsWide*				GetRawTicks(hsWide* ticks) { return fTimer->GetRawTicks(ticks); }

	static	double		GetSeconds() { return fTimer->GetSeconds(); }
	static	double		GetMilliSeconds() { return fTimer->GetMilliSeconds(); }

	static double		RawTicksToDSeconds(const hsWide& ticks) { return fTimer->RawTicksToDSeconds(ticks); }
	static hsWide		DSecondsToRawTicks(double secs) { return fTimer->DSecondsToRawTicks(secs); }

	static hsScalar		GetDelSysSeconds() { return fTimer->GetDelSysSeconds(); }
	static double		GetSysSeconds() { return fTimer->GetSysSeconds(); }

	static double		IncSysSeconds() { return fTimer->IncSysSeconds(); }

	static void			SetRealTime(hsBool realTime) { fTimer->SetRealTime(realTime); }
	static hsBool		IsRealTime() { return fTimer->IsRealTime(); }

	static void			SetFrameTimeInc(hsScalar inc) { fTimer->SetFrameTimeInc(inc); }

	static void			SetTimeScale(hsScalar s) { fTimer->SetTimeScale(s); }
	static hsScalar		GetTimeScale() { return fTimer->GetTimeScale(); }

	static void			SetTimeClamp(hsScalar secs) { fTimer->SetTimeClamp(secs); }
	static void			SetTimeSmoothingClamp(hsScalar secs) { fTimer->SetSmoothingCap(secs); }
	static hsScalar		GetTimeClamp() { return fTimer->GetTimeClamp(); }
	static hsBool		IsClamping() { return fTimer->IsClamping(); }

	///////////////////////////
	// Precision timer routines - these are stateless and implemented as statics.
	///////////////////////////
	static UInt32	GetPrecTickCount();
	static double	GetPrecTicksPerSec();
	static UInt32	PrecSecsToTicks(hsScalar secs);
	static double	PrecTicksToSecs(UInt32 ticks);
	static double	PrecTicksToHz(UInt32 ticks);

	// If you need to time something longer than 20 seconds, use this instead of
	// the precision timer.  It works the same, it just gives you full resolution.
	static UInt64	GetFullTickCount();
	static float	FullTicksToMs(UInt64 ticks);

	//
	// Pass GetTheTimer() into other process space, and then call SetTheTimer() on it.
	static void				SetTheTimer(plTimerShare* timer);
	static plTimerShare*	GetTheTimer() { return fTimer; }
};



#endif