/**

 * 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 <vector.h>

#include <mathlib/math_base.h>

#define SET_VECTOR(addr, vec) \

	addr[0] = sp_ftoc(vec.x); \

	addr[1] = sp_ftoc(vec.y); \

	addr[2] = sp_ftoc(vec.z); 

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

{

	cell_t *addr;

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

	Vector source(sp_ctof(addr[0]), sp_ctof(addr[1]), sp_ctof(addr[2]));

	if (!params[2])

	{

		return sp_ftoc(source.Length());

	} else {

		return sp_ftoc(source.LengthSqr());

	}

}

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

{

	cell_t *addr1, *addr2;

	pContext->LocalToPhysAddr(params[1], &addr1);

	pContext->LocalToPhysAddr(params[2], &addr2);

	Vector source(sp_ctof(addr1[0]), sp_ctof(addr1[1]), sp_ctof(addr1[2]));

	Vector dest(sp_ctof(addr2[0]), sp_ctof(addr2[1]), sp_ctof(addr2[2]));

	if (!params[3])

	{

		return sp_ftoc(source.DistTo(dest));

	} else {

		return sp_ftoc(source.DistToSqr(dest));

	}

}

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

{

	cell_t *addr1, *addr2;

	pContext->LocalToPhysAddr(params[1], &addr1);

	pContext->LocalToPhysAddr(params[2], &addr2);

	Vector source(sp_ctof(addr1[0]), sp_ctof(addr1[1]), sp_ctof(addr1[2]));

	Vector dest(sp_ctof(addr2[0]), sp_ctof(addr2[1]), sp_ctof(addr2[2]));

	return sp_ftoc(source.Dot(dest));

}

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

{

	cell_t *addr1, *addr2, *set;

	pContext->LocalToPhysAddr(params[1], &addr1);

	pContext->LocalToPhysAddr(params[2], &addr2);

	pContext->LocalToPhysAddr(params[3], &set);

	Vector vec1(sp_ctof(addr1[0]), sp_ctof(addr1[1]), sp_ctof(addr1[2]));

	Vector vec2(sp_ctof(addr2[0]), sp_ctof(addr2[1]), sp_ctof(addr2[2]));

	Vector vec3 = vec1.Cross(vec2);

	SET_VECTOR(set, vec3);

	return 1;

}

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

{

	cell_t *ang_addr;

	pContext->LocalToPhysAddr(params[1], &ang_addr);

	QAngle angle(sp_ctof(ang_addr[0]), sp_ctof(ang_addr[1]), sp_ctof(ang_addr[2]));

	Vector fwd, right, up;

	AngleVectors(angle, &fwd, &right, &up);

	cell_t *addr_fwd, *addr_right, *addr_up;

	pContext->LocalToPhysAddr(params[2], &addr_fwd);

	pContext->LocalToPhysAddr(params[3], &addr_right);

	pContext->LocalToPhysAddr(params[4], &addr_up);

	SET_VECTOR(addr_fwd, fwd);

	SET_VECTOR(addr_right, right);

	SET_VECTOR(addr_up, up);

	return 1;

}

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

{

	cell_t *vec_addr;

	pContext->LocalToPhysAddr(params[1], &vec_addr);

	Vector vec(sp_ctof(vec_addr[0]), sp_ctof(vec_addr[1]), sp_ctof(vec_addr[2]));

	QAngle angle;

	VectorAngles(vec, angle);

	cell_t *ang_addr;

	pContext->LocalToPhysAddr(params[2], &ang_addr);

	SET_VECTOR(ang_addr, angle);

	return 1;

}

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

{

	cell_t *vec_addr;

	pContext->LocalToPhysAddr(params[1], &vec_addr);

	Vector vec(sp_ctof(vec_addr[0]), sp_ctof(vec_addr[1]), sp_ctof(vec_addr[2]));

	Vector right, up;

	VectorVectors(vec, right, up);

	cell_t *addr_right, *addr_up;

	pContext->LocalToPhysAddr(params[2], &addr_right);

	pContext->LocalToPhysAddr(params[3], &addr_up);

	SET_VECTOR(addr_right, right);

	SET_VECTOR(addr_up, up);

	return 1;

}

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

{

	cell_t *addr;

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

	Vector source(sp_ctof(addr[0]), sp_ctof(addr[1]), sp_ctof(addr[2]));

	float length = VectorNormalize(source);

	pContext->LocalToPhysAddr(params[2], &addr);

	SET_VECTOR(addr, source);

	return sp_ftoc(length);

}

//:TODO: OMG remove this when we get the OB SDK!!1

// as well as bitbuf.cpp (i write it here just to remind it)

#if defined ORANGEBOX_BUILD && !defined __linux__

float ham(float _X)

{

	return sqrt(_X); 

}

float (*pfSqrt)(float x)  = ham;

#endif

REGISTER_NATIVES(vectorNatives)

{

	{"GetAngleVectors",			GetAngleVectors},

	{"GetVectorAngles",			GetVectorAngles},

	{"GetVectorCrossProduct",	GetVectorCrossProduct},

	{"GetVectorDistance",		GetVectorDistance},

	{"GetVectorDotProduct",		GetVectorDotProduct},

	{"GetVectorLength",			GetVectorLength},

	{"GetVectorVectors",		GetVectorVectors},

	{"NormalizeVector",			NormalizeVector},

	{NULL,					NULL}

};