/**

 * vim: set ts=4 :

 * =============================================================================

 * SourceMod

 * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.

 * =============================================================================

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * 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/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#include "sm_globals.h"

#include "HandleSys.h"

//Note: Do not add this to Linux yet, i haven't done the HPET timing research (if even available)

//nonetheless we need accurate counting

#if !defined PLATFORM_LINUX

struct Profiler

{

	Profiler()

	{

		started = false;

		stopped = false;

	}

#if defined PLATFORM_WINDOWS

	LARGE_INTEGER start;

	LARGE_INTEGER end;

	double freq;

#endif

	bool started;

	bool stopped;

};

HandleType_t g_ProfilerType = 0;

class ProfilerHelpers : 

	public SMGlobalClass,

	public IHandleTypeDispatch

{

public:

	void OnSourceModAllInitialized()

	{

		g_ProfilerType = g_HandleSys.CreateType("Profiler", this, 0, NULL, NULL, g_pCoreIdent, NULL);

	}

	void OnSourceModShutdown()

	{

		g_HandleSys.RemoveType(g_ProfilerType, g_pCoreIdent);

	}

	void OnHandleDestroy(HandleType_t type, void *object)

	{

		Profiler *prof = (Profiler *)object;

		delete prof;

	}

} s_ProfHelpers;

static cell_t CreateProfiler(IPluginContext *pContext, const cell_t *params)

{

	Profiler *p = new Profiler();

#if defined PLATFORM_WINDOWS

	LARGE_INTEGER qpf;

	QueryPerformanceFrequency(&qpf);

	p->freq = 1.0 / (double)(qpf.QuadPart);

#endif

	Handle_t hndl = g_HandleSys.CreateHandle(g_ProfilerType, p, pContext->GetIdentity(), g_pCoreIdent, NULL);

	if (hndl == BAD_HANDLE)

	{

		delete p;

	}

	return hndl;

}

static cell_t StartProfiling(IPluginContext *pContext, const cell_t *params)

{

	Handle_t hndl = params[1];

	HandleSecurity sec = HandleSecurity(pContext->GetIdentity(), g_pCoreIdent);

	HandleError err;

	Profiler *prof;

	if ((err = g_HandleSys.ReadHandle(hndl, g_ProfilerType, &sec, (void **)&prof))

		!= HandleError_None)

	{

		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", hndl, err);

	}

#if defined PLATFORM_WINDOWS

	QueryPerformanceCounter(&prof->start);

#endif

	prof->started = true;

	prof->stopped = false;

	return 1;

}

static cell_t StopProfiling(IPluginContext *pContext, const cell_t *params)

{

	Handle_t hndl = params[1];

	HandleSecurity sec = HandleSecurity(pContext->GetIdentity(), g_pCoreIdent);

	HandleError err;

	Profiler *prof;

	if ((err = g_HandleSys.ReadHandle(hndl, g_ProfilerType, &sec, (void **)&prof))

		!= HandleError_None)

	{

		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", hndl, err);

	}

	if (!prof->started)

	{

		return pContext->ThrowNativeError("Profiler was never started");

	}

#if defined PLATFORM_WINDOWS

	QueryPerformanceCounter(&prof->end);

#endif

	prof->started = false;

	prof->stopped = true;

	return 1;

}

static cell_t GetProfilerTime(IPluginContext *pContext, const cell_t *params)

{

	Handle_t hndl = params[1];

	HandleSecurity sec = HandleSecurity(pContext->GetIdentity(), g_pCoreIdent);

	HandleError err;

	Profiler *prof;

	if ((err = g_HandleSys.ReadHandle(hndl, g_ProfilerType, &sec, (void **)&prof))

		!= HandleError_None)

	{

		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", hndl, err);

	}

	if (!prof->stopped)

	{

		return pContext->ThrowNativeError("Profiler was never stopped");

	}

	float fTime;

#if defined PLATFORM_WINDOWS

	LONGLONG diff = prof->end.QuadPart - prof->start.QuadPart;

	double seconds = diff * prof->freq;

	fTime = (float)seconds;

#endif

	return sp_ftoc(fTime);

}

REGISTER_NATIVES(profilerNatives)

{

	{"CreateProfiler",			CreateProfiler},

	{"GetProfilerTime",			GetProfilerTime},

	{"StartProfiling",			StartProfiling},

	{"StopProfiling",			StopProfiling},

	{NULL,						NULL},

};

#endif