/**

  * vim: set ts=4 :

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

  * SourceMod

  * Copyright (C) 2004-2007 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

 #error "Not supported"

 #endif

 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},

 };