/**
 * vim: set ts=4 :
 * =============================================================================
 * SourceMod SDKTools Extension
 * 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 "extension.h"
#include <worldsize.h>

class CSMTraceFilter : public CTraceFilter
{
public:
	bool ShouldHitEntity(IHandleEntity *pEntity, int contentsMask)
	{
		cell_t res = 1;
		m_pFunc->PushCell(gamehelpers->EntityToBCompatRef(reinterpret_cast<CBaseEntity *>(pEntity)));
		m_pFunc->PushCell(contentsMask);
		m_pFunc->PushCell(m_Data);
		m_pFunc->Execute(&res);

		return (res) ? true : false;
	}
	void SetFunctionPtr(IPluginFunction *pFunc, cell_t data)
	{
		m_pFunc = pFunc;
		m_Data = data;
	}
private:
	IPluginFunction *m_pFunc;
	cell_t m_Data;
};

/* Used for the global trace version */
Ray_t g_Ray;
trace_t g_Trace;
Vector g_StartVec;
Vector g_EndVec;
Vector g_HullMins;
Vector g_HullMaxs;
QAngle g_DirAngles;
CTraceFilterHitAll g_HitAllFilter;
CSMTraceFilter g_SMTraceFilter;

enum
{
	RayType_EndPoint,
	RayType_Infinite
};

static cell_t smn_TRTraceRay(IPluginContext *pContext, const cell_t *params)
{
	cell_t *startaddr, *endaddr;
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);

	g_StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));

	switch (params[4])
	{
	case RayType_EndPoint:
		{
			g_EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			break;
		}
	case RayType_Infinite:
		{
			g_DirAngles.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			AngleVectors(g_DirAngles, &g_EndVec);

			/* Make it unitary and get the ending point */
			g_EndVec.NormalizeInPlace();
			g_EndVec = g_StartVec + g_EndVec * MAX_TRACE_LENGTH;
			break;
		}
	}

	g_Ray.Init(g_StartVec, g_EndVec);
	enginetrace->TraceRay(g_Ray, params[3], &g_HitAllFilter, &g_Trace);

	return 1;
}

static cell_t smn_TRTraceHull(IPluginContext *pContext, const cell_t *params)
{
	cell_t *startaddr, *endaddr, *mins, *maxs;
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);
	pContext->LocalToPhysAddr(params[3], &mins);
	pContext->LocalToPhysAddr(params[4], &maxs);

	g_StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));
	g_HullMins.Init(sp_ctof(mins[0]), sp_ctof(mins[1]), sp_ctof(mins[2]));
	g_HullMaxs.Init(sp_ctof(maxs[0]), sp_ctof(maxs[1]), sp_ctof(maxs[2]));
	g_EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));

	g_Ray.Init(g_StartVec, g_EndVec, g_HullMins, g_HullMaxs);
	enginetrace->TraceRay(g_Ray, params[5], &g_HitAllFilter, &g_Trace);

	return 1;
}

static cell_t smn_TRTraceRayFilter(IPluginContext *pContext, const cell_t *params)
{
	cell_t *startaddr, *endaddr;
	IPluginFunction *pFunc;
	cell_t data;

	pFunc = pContext->GetFunctionById(params[5]);
	if (!pFunc)
	{
		return pContext->ThrowNativeError("Invalid function id (%X)", params[5]);
	}

	if (params[0] >= 6)
	{
		data = params[6];
	}
	else
	{
		data = 0;
	}

	g_SMTraceFilter.SetFunctionPtr(pFunc, data);
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);

	g_StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));

	switch (params[4])
	{
	case RayType_EndPoint:
		{
			g_EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			break;
		}
	case RayType_Infinite:
		{
			g_DirAngles.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			AngleVectors(g_DirAngles, &g_EndVec);

			/* Make it unitary and get the ending point */
			g_EndVec.NormalizeInPlace();
			g_EndVec = g_StartVec + g_EndVec * MAX_TRACE_LENGTH;
			break;
		}
	}

	g_Ray.Init(g_StartVec, g_EndVec);
	enginetrace->TraceRay(g_Ray, params[3], &g_SMTraceFilter, &g_Trace);

	return 1;
}

static cell_t smn_TRTraceHullFilter(IPluginContext *pContext, const cell_t *params)
{
	cell_t data;
	IPluginFunction *pFunc;
	cell_t *startaddr, *endaddr, *mins, *maxs;

	pFunc = pContext->GetFunctionById(params[6]);
	if (!pFunc)
	{
		return pContext->ThrowNativeError("Invalid function id (%X)", params[5]);
	}

	data = params[7];

	g_SMTraceFilter.SetFunctionPtr(pFunc, data);
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);
	pContext->LocalToPhysAddr(params[3], &mins);
	pContext->LocalToPhysAddr(params[4], &maxs);

	g_StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));
	g_HullMins.Init(sp_ctof(mins[0]), sp_ctof(mins[1]), sp_ctof(mins[2]));
	g_HullMaxs.Init(sp_ctof(maxs[0]), sp_ctof(maxs[1]), sp_ctof(maxs[2]));
	g_EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));

	g_Ray.Init(g_StartVec, g_EndVec, g_HullMins, g_HullMaxs);
	enginetrace->TraceRay(g_Ray, params[5], &g_SMTraceFilter, &g_Trace);

	return 1;
}


static cell_t smn_TRTraceRayEx(IPluginContext *pContext, const cell_t *params)
{
	cell_t *startaddr, *endaddr;
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);

	Vector StartVec, EndVec;
	Ray_t ray;

	StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));

	switch (params[4])
	{
	case RayType_EndPoint:
		{
			EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			break;
		}
	case RayType_Infinite:
		{
			QAngle DirAngles;
			DirAngles.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			AngleVectors(DirAngles, &EndVec);

			/* Make it unitary and get the ending point */
			EndVec.NormalizeInPlace();
			EndVec = StartVec + EndVec * MAX_TRACE_LENGTH;
			break;
		}
	}

	trace_t *tr = new trace_t;
	ray.Init(StartVec, EndVec);
	enginetrace->TraceRay(ray, params[3], &g_HitAllFilter, tr);

	HandleError herr;
	Handle_t hndl;
	if (!(hndl=handlesys->CreateHandle(g_TraceHandle, tr, pContext->GetIdentity(), myself->GetIdentity(), &herr)))
	{
		delete tr;
		return pContext->ThrowNativeError("Unable to create a new trace handle (error %d)", herr);
	}

	return hndl;
}

static cell_t smn_TRTraceHullEx(IPluginContext *pContext, const cell_t *params)
{
	cell_t *startaddr, *endaddr, *mins, *maxs;
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);
	pContext->LocalToPhysAddr(params[3], &mins);
	pContext->LocalToPhysAddr(params[4], &maxs);

	Ray_t ray;
	Vector StartVec, EndVec, vmins, vmaxs;

	StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));
	vmins.Init(sp_ctof(mins[0]), sp_ctof(mins[1]), sp_ctof(mins[2]));
	vmaxs.Init(sp_ctof(maxs[0]), sp_ctof(maxs[1]), sp_ctof(maxs[2]));
	EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));

	ray.Init(StartVec, EndVec, vmins, vmaxs);

	trace_t *tr = new trace_t;
	enginetrace->TraceRay(ray, params[5], &g_HitAllFilter, tr);

	HandleError herr;
	Handle_t hndl;
	if (!(hndl=handlesys->CreateHandle(g_TraceHandle, tr, pContext->GetIdentity(), myself->GetIdentity(), &herr)))
	{
		delete tr;
		return pContext->ThrowNativeError("Unable to create a new trace handle (error %d)", herr);
	}

	return hndl;
}

static cell_t smn_TRTraceRayFilterEx(IPluginContext *pContext, const cell_t *params)
{
	IPluginFunction *pFunc;
	cell_t *startaddr, *endaddr;
	cell_t data;

	pFunc = pContext->GetFunctionById(params[5]);
	if (!pFunc)
	{
		return pContext->ThrowNativeError("Invalid function id (%X)", params[5]);
	}
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);

	Vector StartVec, EndVec;
	CSMTraceFilter smfilter;
	Ray_t ray;

	if (params[0] >= 6)
	{
		data = params[6];
	}
	else
	{
		data = 0;
	}

	smfilter.SetFunctionPtr(pFunc, data);
	StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));

	switch (params[4])
	{
	case RayType_EndPoint:
		{
			EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			break;
		}
	case RayType_Infinite:
		{
			QAngle DirAngles;
			DirAngles.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));
			AngleVectors(DirAngles, &EndVec);

			/* Make it unitary and get the ending point */
			EndVec.NormalizeInPlace();
			EndVec = StartVec + EndVec * MAX_TRACE_LENGTH;
			break;
		}
	}

	trace_t *tr = new trace_t;
	ray.Init(StartVec, EndVec);
	enginetrace->TraceRay(ray, params[3], &smfilter, tr);

	HandleError herr;
	Handle_t hndl;
	if (!(hndl=handlesys->CreateHandle(g_TraceHandle, tr, pContext->GetIdentity(), myself->GetIdentity(), &herr)))
	{
		delete tr;
		return pContext->ThrowNativeError("Unable to create a new trace handle (error %d)", herr);
	}

	return hndl;
}

static cell_t smn_TRTraceHullFilterEx(IPluginContext *pContext, const cell_t *params)
{
	IPluginFunction *pFunc;
	cell_t *startaddr, *endaddr, *mins, *maxs;
	cell_t data;

	pFunc = pContext->GetFunctionById(params[6]);
	if (!pFunc)
	{
		return pContext->ThrowNativeError("Invalid function id (%X)", params[5]);
	}
	pContext->LocalToPhysAddr(params[1], &startaddr);
	pContext->LocalToPhysAddr(params[2], &endaddr);
	pContext->LocalToPhysAddr(params[3], &mins);
	pContext->LocalToPhysAddr(params[4], &maxs);

	Vector StartVec, EndVec, vmins, vmaxs;
	CSMTraceFilter smfilter;
	Ray_t ray;

	data = params[7];

	smfilter.SetFunctionPtr(pFunc, data);
	StartVec.Init(sp_ctof(startaddr[0]), sp_ctof(startaddr[1]), sp_ctof(startaddr[2]));
	vmins.Init(sp_ctof(mins[0]), sp_ctof(mins[1]), sp_ctof(mins[2]));
	vmaxs.Init(sp_ctof(maxs[0]), sp_ctof(maxs[1]), sp_ctof(maxs[2]));
	EndVec.Init(sp_ctof(endaddr[0]), sp_ctof(endaddr[1]), sp_ctof(endaddr[2]));

	ray.Init(StartVec, EndVec, vmins, vmaxs);

	trace_t *tr = new trace_t;
	enginetrace->TraceRay(ray, params[5], &smfilter, tr);

	HandleError herr;
	Handle_t hndl;
	if (!(hndl=handlesys->CreateHandle(g_TraceHandle, tr, pContext->GetIdentity(), myself->GetIdentity(), &herr)))
	{
		delete tr;
		return pContext->ThrowNativeError("Unable to create a new trace handle (error %d)", herr);
	}

	return hndl;
}

static cell_t smn_TRGetFraction(IPluginContext *pContext, const cell_t *params)
{
	trace_t *tr;
	HandleError err;
	HandleSecurity sec(pContext->GetIdentity(), myself->GetIdentity());

	if (params[1] == BAD_HANDLE)
	{
		tr = &g_Trace;
	} else if ((err = handlesys->ReadHandle(params[1], g_TraceHandle, &sec, (void **)&tr)) != HandleError_None) {
		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", params[1], err);
	}

	return sp_ftoc(tr->fraction);
}

static cell_t smn_TRGetPlaneNormal(IPluginContext *pContext, const cell_t *params)
{
	trace_t *tr;
	HandleError err;
	HandleSecurity sec(pContext->GetIdentity(), myself->GetIdentity());

	if (params[1] == BAD_HANDLE)
	{
		tr = &g_Trace;
	} else if ((err = handlesys->ReadHandle(params[1], g_TraceHandle, &sec, (void **)&tr)) != HandleError_None) {
		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", params[1], err);
	}

	Vector *normal = &tr->plane.normal;

	cell_t *r;
	pContext->LocalToPhysAddr(params[2], &r);
	r[0] = sp_ftoc(normal->x);
	r[1] = sp_ftoc(normal->y);
	r[2] = sp_ftoc(normal->z);

	return 1;
}


static cell_t smn_TRGetEndPosition(IPluginContext *pContext, const cell_t *params)
{
	trace_t *tr;
	HandleError err;
	HandleSecurity sec(pContext->GetIdentity(), myself->GetIdentity());

	if (params[2] == BAD_HANDLE)
	{
		tr = &g_Trace;
	} else if ((err = handlesys->ReadHandle(params[2], g_TraceHandle, &sec, (void **)&tr)) != HandleError_None) {
		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", params[2], err);
	}

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

	addr[0] = sp_ftoc(tr->endpos.x);
	addr[1] = sp_ftoc(tr->endpos.y);
	addr[2] = sp_ftoc(tr->endpos.z);

	return 1;
}

static cell_t smn_TRDidHit(IPluginContext *pContext, const cell_t *params)
{
	trace_t *tr;
	HandleError err;
	HandleSecurity sec(pContext->GetIdentity(), myself->GetIdentity());

	if (params[1] == BAD_HANDLE)
	{
		tr = &g_Trace;
	} else if ((err = handlesys->ReadHandle(params[1], g_TraceHandle, &sec, (void **)&tr)) != HandleError_None) {
		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", params[1], err);
	}

	return tr->DidHit() ? 1 : 0;
}

static cell_t smn_TRGetHitGroup(IPluginContext *pContext, const cell_t *params)
{
	trace_t *tr;
	HandleError err;
	HandleSecurity sec(pContext->GetIdentity(), myself->GetIdentity());

	if (params[1] == BAD_HANDLE)
	{
		tr = &g_Trace;
	} else if ((err = handlesys->ReadHandle(params[1], g_TraceHandle, &sec, (void **)&tr)) != HandleError_None) {
		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", params[1], err);
	}

	return tr->hitgroup;
}

static cell_t smn_TRGetEntityIndex(IPluginContext *pContext, const cell_t *params)
{
	trace_t *tr;
	HandleError err;
	HandleSecurity sec(pContext->GetIdentity(), myself->GetIdentity());

	if (params[1] == BAD_HANDLE)
	{
		tr = &g_Trace;
	} else if ((err = handlesys->ReadHandle(params[1], g_TraceHandle, &sec, (void **)&tr)) != HandleError_None) {
		return pContext->ThrowNativeError("Invalid Handle %x (error %d)", params[1], err);
	}

	if (tr->m_pEnt == NULL)
	{
		return 0;
	}

	return gamehelpers->EntityToBCompatRef(tr->m_pEnt);
}

static cell_t smn_TRGetPointContents(IPluginContext *pContext, const cell_t *params)
{
	cell_t *vec, *ent;
	IHandleEntity *hentity;
	Vector pos;
	int mask;

	pContext->LocalToPhysAddr(params[1], &vec);
	pContext->LocalToPhysAddr(params[2], &ent);

	pos.x = sp_ctof(vec[0]);
	pos.y = sp_ctof(vec[1]);
	pos.z = sp_ctof(vec[2]);

	if (*ent == -1)
	{
		mask = enginetrace->GetPointContents(pos);
	} else {
#if (SOURCE_ENGINE == SE_LEFT4DEAD) || (SOURCE_ENGINE == SE_LEFT4DEAD2)
		mask = enginetrace->GetPointContents(pos, 0, &hentity);
#else
		mask = enginetrace->GetPointContents(pos, &hentity);
#endif
		*ent = gamehelpers->EntityToBCompatRef(reinterpret_cast<CBaseEntity *>(hentity));
	}

	return mask;
}

static cell_t smn_TRGetPointContentsEnt(IPluginContext *pContext, const cell_t *params)
{
	/* TODO: See if we can get the collidable with a prop and remove the reliance on edicts */
	edict_t *pEdict = PEntityOfEntIndex(gamehelpers->ReferenceToIndex(params[1]));
	if (!pEdict || pEdict->IsFree())
	{
		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);
	}

	cell_t *addr;
	Vector pos;

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

	pos.x = sp_ctof(addr[0]);
	pos.y = sp_ctof(addr[1]);
	pos.z = sp_ctof(addr[2]);

	return enginetrace->GetPointContents_Collideable(pEdict->GetCollideable(), pos);
}

static cell_t smn_TRPointOutsideWorld(IPluginContext *pContext, const cell_t *params)
{
	cell_t *vec;
	Vector pos;
	
	pContext->LocalToPhysAddr(params[1], &vec);

	pos.x = sp_ctof(vec[0]);
	pos.y = sp_ctof(vec[1]);
	pos.z = sp_ctof(vec[2]);

	return enginetrace->PointOutsideWorld(pos);
}

sp_nativeinfo_t g_TRNatives[] = 
{
	{"TR_TraceRay",				smn_TRTraceRay},
	{"TR_TraceHull",			smn_TRTraceHull},
	{"TR_TraceRayEx",			smn_TRTraceRayEx},
	{"TR_TraceHullEx",			smn_TRTraceHullEx},
	{"TR_GetFraction",			smn_TRGetFraction},
	{"TR_GetEndPosition",		smn_TRGetEndPosition},
	{"TR_GetEntityIndex",		smn_TRGetEntityIndex},
	{"TR_DidHit",				smn_TRDidHit},
	{"TR_GetHitGroup",			smn_TRGetHitGroup},
	{"TR_GetPointContents",		smn_TRGetPointContents},
	{"TR_GetPointContentsEnt",	smn_TRGetPointContentsEnt},
	{"TR_TraceRayFilter",		smn_TRTraceRayFilter},
	{"TR_TraceRayFilterEx",		smn_TRTraceRayFilterEx},
	{"TR_TraceHullFilter",		smn_TRTraceHullFilter},
	{"TR_TraceHullFilterEx",	smn_TRTraceHullFilterEx},
	{"TR_GetPlaneNormal",		smn_TRGetPlaneNormal},
	{"TR_PointOutsideWorld",	smn_TRPointOutsideWorld},
	{NULL,						NULL}
};