/**

 * vim: set ts=4 sw=4 tw=99 :

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

 * 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 <math.h>

#include <string.h>

#include <stdlib.h>

#include "common_logic.h"

#include "MersenneTwister.h"

#include <IPluginSys.h>

/****************************************

*                                       *

* FLOATING POINT NATIVE IMPLEMENTATIONS *

*                                       *

****************************************/

static cell_t sm_float(IPluginContext *pCtx, const cell_t *params)

{

	float val = static_cast<float>(params[1]);

	return sp_ftoc(val);

}

static cell_t sm_FloatAbs(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = (val >= 0.0f) ? val : -val;

	return sp_ftoc(val);

}

static cell_t sm_FloatAdd(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) + sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatSub(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) - sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatMul(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) * sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatDiv(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]) / sp_ctof(params[2]);

	return sp_ftoc(val);

}

static cell_t sm_FloatCompare(IPluginContext *pCtx, const cell_t *params)

{

	float val1 = sp_ctof(params[1]);

	float val2 = sp_ctof(params[2]);

	if (val1 > val2)

	{

		return 1;

	} else if (val1 < val2) {

		return -1;

	}

	return 0;

}

static cell_t sm_Logarithm(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	float base = sp_ctof(params[2]);

	if ((val <= 0.0f) || (base <= 0.0f))

	{

		return pCtx->ThrowNativeError("Cannot evaluate the logarithm of zero or a negative number (val:%f base:%f)", val, base);

	}

	if (base == 10.0f)

	{

		val = log10(val);

	} else {

		val = log(val) / log(base);

	}

	return sp_ftoc(val);

}

static cell_t sm_Exponential(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	return sp_ftoc(exp(val));

}

static cell_t sm_Pow(IPluginContext *pCtx, const cell_t *params)

{

	float base = sp_ctof(params[1]);

	float exponent = sp_ctof(params[2]);

	return sp_ftoc(pow(base, exponent));

}

static cell_t sm_SquareRoot(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	if (val < 0.0f)

	{

		return pCtx->ThrowNativeError("Cannot evaluate the square root of a negative number (val:%f)", val);

	}

	return sp_ftoc(sqrt(val));

}

static cell_t sm_RoundToNearest(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = (float)floor(val + 0.5f);

	return static_cast<int>(val);

}

static cell_t sm_RoundToFloor(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = floor(val);

	return static_cast<int>(val);

}

static cell_t sm_RoundToCeil(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = ceil(val);

	return static_cast<int>(val);

}

static cell_t sm_RoundToZero(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	if (val >= 0.0f)

	{

		val = floor(val);

	} else {

		val = ceil(val);

	}

	return static_cast<int>(val);

}

static cell_t sm_FloatFraction(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = val - floor(val);

	return sp_ftoc(val);

}

static cell_t sm_Sine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = sin(val);

	return sp_ftoc(val);

}

static cell_t sm_Cosine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = cos(val);

	return sp_ftoc(val);

}

static cell_t sm_Tangent(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = tan(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcSine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = asin(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcCosine(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = acos(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcTangent(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	val = atan(val);

	return sp_ftoc(val);

}

static cell_t sm_ArcTangent2(IPluginContext *pCtx, const cell_t *params)

{

	float val1 = sp_ctof(params[1]);

	float val2 = sp_ctof(params[2]);

	val1 = atan2(val1, val2);

	return sp_ftoc(val1);

}

#if 0

static cell_t sm_FloatRound(IPluginContext *pCtx, const cell_t *params)

{

	float val = sp_ctof(params[1]);

	switch (params[2])

	{

	case 1:

		{

			val = floor(val);

			break;

		}

	case 2:

		{

			val = ceil(val);

			break;

		}

	case 3:

		{

			if (val >= 0.0f)

			{

				val = floor(val);

			} else {

				val = ceil(val);

			}

			break;

		}

	default:

		{

			val = (float)floor(val + 0.5f);

			break;

		}

	}

	return static_cast<int>(val);

}

#endif

class RandomHelpers :

	public SMGlobalClass,

	public IPluginsListener

{

public:

	void OnSourceModAllInitialized()

	{

		pluginsys->AddPluginsListener(this);

	}

	void OnSourceModShutdown()

	{

		pluginsys->RemovePluginsListener(this);

	}

	void OnPluginDestroyed(IPlugin *plugin)

	{

		MTRand *mtrand;

		if (plugin->GetProperty("core.logic.mtrand", (void**)&mtrand, true))

		{

			delete mtrand;

		}

	}

	MTRand *RandObjForPlugin(IPluginContext *ctx)

	{

		IPlugin *plugin = pluginsys->FindPluginByContext(ctx->GetContext());

		MTRand *mtrand;	

		if (!plugin->GetProperty("core.logic.mtrand", (void**)&mtrand))

		{

			mtrand = new MTRand();

			plugin->SetProperty("core.logic.mtrand", mtrand);

		}

		return mtrand;

	}

} s_RandHelpers;

static cell_t GetURandomInt(IPluginContext *ctx, const cell_t *params)

{

	MTRand *randobj = s_RandHelpers.RandObjForPlugin(ctx);

	/* Note the sign bit must be stripped off because cell_t is signed,

	 * and this guarantees a range of [0,max_int]

	 */

	return randobj->randInt() & 0x7FFFFFFF;

}

static cell_t GetURandomFloat(IPluginContext *ctx, const cell_t *params)

{

	MTRand *randobj = s_RandHelpers.RandObjForPlugin(ctx);

	return sp_ftoc((float)randobj->rand());

}

static cell_t SetURandomSeed(IPluginContext *ctx, const cell_t *params)

{

	MTRand *randobj = s_RandHelpers.RandObjForPlugin(ctx);

	cell_t *addr;

	ctx->LocalToPhysAddr(params[1], &addr);

	/* We're 32-bit only. */

	randobj->seed((MTRand::uint32*)addr, params[2]);

	return 1;

}

REGISTER_NATIVES(floatnatives)

{

	{"float",			sm_float},

	{"FloatMul",		sm_FloatMul},

	{"FloatDiv",		sm_FloatDiv},

	{"FloatAdd",		sm_FloatAdd},

	{"FloatSub",		sm_FloatSub},

	{"FloatFraction",	sm_FloatFraction},

	{"RoundToZero",		sm_RoundToZero},

	{"RoundToCeil",		sm_RoundToCeil},

	{"RoundToFloor",	sm_RoundToFloor},

	{"RoundToNearest",	sm_RoundToNearest},

	{"FloatCompare",	sm_FloatCompare},

	{"SquareRoot",		sm_SquareRoot},

	{"Pow",				sm_Pow},

	{"Exponential",		sm_Exponential},

	{"Logarithm",		sm_Logarithm},

	{"Sine",			sm_Sine},

	{"Cosine",			sm_Cosine},

	{"Tangent",			sm_Tangent},

	{"FloatAbs",		sm_FloatAbs},

	{"ArcTangent",		sm_ArcTangent},

	{"ArcCosine",		sm_ArcCosine},

	{"ArcSine",			sm_ArcSine},

	{"ArcTangent2",		sm_ArcTangent2},

	{"GetURandomInt",	GetURandomInt},

	{"GetURandomFloat",	GetURandomFloat},

	{"SetURandomSeed",	SetURandomSeed},

	{NULL,				NULL}

};