/**

 * 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 "smsdk_ext.h"

#include "extension.h"

#include "vdecoder.h"

#include "vcallbuilder.h"

using namespace SourceMod;

using namespace SourcePawn;

/**

 * For object pointers, the data looks like this instead:

 * 4 bytes: POINTER TO LATER

 * + bytes: Object internal data

 *

 * We use the virtual stack as extra fake stack space and create a temp object.

 * If these objects had destructors, we'd need to fake destroy toom of course.

 * Of course, BinTools only reads the first four bytes and passes the pointer.

 */

size_t ValveParamToBinParam(ValveType type, 

						  PassType pass,

						  unsigned int flags,

						  PassInfo *info,

						  bool &needs_extra)

{

	needs_extra = false;

	switch (type)

	{

	case Valve_Vector:

		{

			size_t mySize = sizeof(Vector *);

			if (pass == PassType_Basic)

			{

				if (flags & PASSFLAG_BYREF)

				{

					return 0;

				}

				info->type = PassType_Basic;

				info->flags = flags;

				info->size = sizeof(Vector *);

				mySize = sizeof(Vector);

				needs_extra = true;

			} else if (pass == PassType_Object) {

				info->type = PassType_Object;

				info->flags = flags | PASSFLAG_OASSIGNOP | PASSFLAG_OCTOR;

				info->size = sizeof(Vector);

			} else {

				return 0;

			}

			return mySize;

		}

	case Valve_QAngle:

		{

			size_t mySize = sizeof(QAngle *);

			if (pass == PassType_Basic)

			{

				if (flags & PASSFLAG_BYREF)

				{

					return 0;

				}

				info->type = PassType_Basic;

				info->flags = flags;

				info->size = sizeof(QAngle *);

				mySize = sizeof(QAngle);

				needs_extra = true;

			} else if (pass == PassType_Object) {

				info->type = PassType_Object;

				info->flags = flags | PASSFLAG_OASSIGNOP | PASSFLAG_OCTOR;

				info->size = sizeof(QAngle);

			} else {

				return 0;

			}

			return mySize;

		}

	case Valve_CBaseEntity:

	case Valve_CBasePlayer:

	case Valve_Edict:

	case Valve_String:

		{

			if (pass != PassType_Basic || (flags & PASSFLAG_BYREF))

			{

				return 0;

			}

			info->type = PassType_Basic;

			info->flags = flags;

			info->size = sizeof(void *);

			return sizeof(void *);

		}

	case Valve_POD:

		{

			info->type = PassType_Basic;

			info->flags = flags;

			if (flags & PASSFLAG_ASPOINTER)

			{

				needs_extra = true;

				info->size = sizeof(int *);

				return sizeof(int *) + sizeof(int);

			} else {

				info->size = sizeof(int);

				return sizeof(int);

			}

		}

	case Valve_Bool:

		{

			info->type = PassType_Basic;

			info->flags = flags;

			if (flags & PASSFLAG_ASPOINTER)

			{

				needs_extra = true;

				info->size = sizeof(bool *);

				return sizeof(bool *) + sizeof(bool);

			} else {

				info->size = sizeof(bool);

				return sizeof(bool);

			}

		}

	case Valve_Float:

		{

			info->flags = flags;

			if (flags & PASSFLAG_ASPOINTER)

			{

				needs_extra = true;

				info->type = PassType_Basic;

				info->size = sizeof(float *);

				return sizeof(float *) + sizeof(float);

			} else {

				info->type = PassType_Float;

				info->size = sizeof(float);

				return sizeof(float);

			}

		}

	}

	return 0;

}

DataStatus EncodeValveParam(IPluginContext *pContext,

							cell_t param, 

							const ValveCall *pCall,

							const ValvePassInfo *data,

							const void *_buffer)

{

	const void *buffer = (const unsigned char *)_buffer + data->offset;

	switch (data->vtype)

	{

	case Valve_Vector:

		{

			Vector *v = NULL;

			if (data->type == PassType_Basic)

			{

				v = *(Vector **)buffer;

			} else if (data->type == PassType_Object) {

				v = (Vector *)buffer;

			}

			cell_t *addr;

			pContext->LocalToPhysAddr(param, &addr);

			addr[0] = sp_ftoc(v->x);

			addr[1] = sp_ftoc(v->y);

			addr[2] = sp_ftoc(v->z);

			return Data_Okay;

		}

	case Valve_QAngle:

		{

			QAngle *q = NULL;

			if (data->type == PassType_Basic)

			{

				q = *(QAngle **)buffer;

			} else if (data->type == PassType_Object) {

				q = (QAngle *)buffer;

			}

			cell_t *addr;

			pContext->LocalToPhysAddr(param, &addr);

			addr[0] = sp_ftoc(q->x);

			addr[1] = sp_ftoc(q->y);

			addr[2] = sp_ftoc(q->z);

			return Data_Okay;

		}

	case Valve_CBaseEntity:

	case Valve_CBasePlayer:

		{

			cell_t *addr;

			pContext->LocalToPhysAddr(param, &addr);

			CBaseEntity *pEntity = *(CBaseEntity **)buffer;

			if (pEntity)

			{

				*addr = gamehelpers->EntityToBCompatRef(pEntity);

			} else {

				*addr = -1;

			}

			return Data_Okay;

		}

	case Valve_Edict:

		{

			cell_t *addr;

			pContext->LocalToPhysAddr(param, &addr);

			edict_t *pEdict = *(edict_t **)buffer;

			if (pEdict)

			{

				*addr = IndexOfEdict(pEdict);

			} else {

				*addr = -1;

			}

			return Data_Okay;

		}

	case Valve_POD:

	case Valve_Float:

		{

			cell_t *addr;

			pContext->LocalToPhysAddr(param, &addr);

			if (data->flags & PASSFLAG_ASPOINTER)

			{

				buffer = *(cell_t **)buffer;

			}

			*addr = *(cell_t *)buffer;

			return Data_Okay;

		}

	case Valve_Bool:

		{

			cell_t *addr;

			pContext->LocalToPhysAddr(param, &addr);

			if (data->flags & PASSFLAG_ASPOINTER)

			{

				buffer = *(bool **)buffer;

			}

			*addr = *(bool *)buffer ? 1 : 0;

			return Data_Okay;

		}

	}

	return Data_Fail;

}

DataStatus DecodeValveParam(IPluginContext *pContext,

					  cell_t param,

					  const ValveCall *pCall,

					  const ValvePassInfo *data,

					  void *_buffer)

{

	void *buffer = (unsigned char *)_buffer + data->offset;

	switch (data->vtype)

	{

	case Valve_Vector:

		{

			cell_t *addr;

			int err;

			err = pContext->LocalToPhysAddr(param, &addr);

			unsigned char *mem = (unsigned char *)buffer;

			if (data->type == PassType_Basic)

			{

				/* Store the object in the next N bytes, and store

				 * a pointer to that object right beforehand.

				 */

				Vector **realPtr = (Vector **)buffer;

				if (addr == pContext->GetNullRef(SP_NULL_VECTOR))

				{

					if (data->decflags & VDECODE_FLAG_ALLOWNULL)

					{

						*realPtr = NULL;

						return Data_Okay;

					} else {

						pContext->ThrowNativeError("NULL not allowed");

						return Data_Fail;

					}

				} else {

					mem = (unsigned char *)_buffer + pCall->stackEnd + data->obj_offset;

					*realPtr = (Vector *)mem;

				}

			}

			if (err != SP_ERROR_NONE)

			{

				pContext->ThrowNativeErrorEx(err, "Could not read plugin data");

				return Data_Fail;

			}

			/* Use placement new to initialize the object cleanly

			 * This has no destructor so we don't need to do 

			 * DestroyValveParam() or something :]

			 */

			Vector *v = new (mem) Vector(

				sp_ctof(addr[0]),

				sp_ctof(addr[1]),

				sp_ctof(addr[2]));

			return Data_Okay;

		}

	case Valve_QAngle:

		{

			cell_t *addr;

			int err;

			err = pContext->LocalToPhysAddr(param, &addr);

			unsigned char *mem = (unsigned char *)buffer;

			if (data->type == PassType_Basic)

			{

				/* Store the object in the next N bytes, and store

				 * a pointer to that object right beforehand.

				 */

				QAngle **realPtr = (QAngle **)buffer;

				if (addr == pContext->GetNullRef(SP_NULL_VECTOR))

				{

					if (!(data->decflags & VDECODE_FLAG_ALLOWNULL))

					{

						pContext->ThrowNativeError("NULL not allowed");

						return Data_Fail;

					} else {

						*realPtr = NULL;

						return Data_Okay;

					}

				} else {

					mem = (unsigned char *)_buffer + pCall->stackEnd + data->obj_offset;

					*realPtr = (QAngle *)mem;

				}

			}

			if (err != SP_ERROR_NONE)

			{

				pContext->ThrowNativeErrorEx(err, "Could not read plugin data");

				return Data_Fail;

			}

			/* Use placement new to initialize the object cleanly

			 * This has no destructor so we don't need to do 

			 * DestroyValveParam() or something :]

			 */

			QAngle *v = new (mem) QAngle(

				sp_ctof(addr[0]),

				sp_ctof(addr[1]),

				sp_ctof(addr[2]));

			return Data_Okay;

		}

	case Valve_CBasePlayer:

		{

			CBaseEntity *pEntity = NULL;

			if (data->decflags & VDECODE_FLAG_BYREF)

			{

				cell_t *addr;

				pContext->LocalToPhysAddr(param, &addr);

				param = *addr;

			}

			int index = gamehelpers->ReferenceToIndex(param);

			if ((unsigned)index == INVALID_EHANDLE_INDEX && param != -1)

			{

				return Data_Fail;

			}

			if (index >= 1 && index <= playerhelpers->GetMaxClients())

			{

				IGamePlayer *player = playerhelpers->GetGamePlayer(index);

				if ((data->decflags & VDECODE_FLAG_ALLOWNOTINGAME)

					&& !player->IsConnected())

				{

					pContext->ThrowNativeError("Client %d is not connected", param);

					return Data_Fail;

				} else if (!player->IsInGame()) {

					pContext->ThrowNativeError("Client %d is not in game", param);

					return Data_Fail;

				}

				pEntity = gamehelpers->ReferenceToEntity(param);

			} else if (param == -1) {

				if (data->decflags & VDECODE_FLAG_ALLOWNULL)

				{

					pEntity = NULL;

				} else {

					pContext->ThrowNativeError("NULL not allowed");

					return Data_Fail;

				}

			} else {

				pContext->ThrowNativeError("Entity index %d is not a valid client", param);

				return Data_Fail;

			}

			CBaseEntity **ebuf = (CBaseEntity **)buffer;

			*ebuf = pEntity;

			return Data_Okay;

		}

	case Valve_CBaseEntity:

		{

			CBaseEntity *pEntity = NULL;

			if (data->decflags & VDECODE_FLAG_BYREF)

			{

				cell_t *addr;

				pContext->LocalToPhysAddr(param, &addr);

				param = *addr;

			}

			int index = gamehelpers->ReferenceToIndex(param);

			if ((unsigned)index == INVALID_EHANDLE_INDEX && param != -1)

			{

				return Data_Fail;

			}

			if (index >= 1 && index <= playerhelpers->GetMaxClients())

			{

				IGamePlayer *player = playerhelpers->GetGamePlayer(index);

				if ((data->decflags & VDECODE_FLAG_ALLOWNOTINGAME)

					&& !player->IsConnected())

				{

					pContext->ThrowNativeError("Client %d is not connected", param);

					return Data_Fail;

				} else if (!player->IsInGame()) {

					pContext->ThrowNativeError("Client %d is not in game", param);

					return Data_Fail;

				}

				pEntity = gamehelpers->ReferenceToEntity(param);

			} else if (param == -1) {

				if (data->decflags & VDECODE_FLAG_ALLOWNULL)

				{

					pEntity = NULL;

				} else {

					pContext->ThrowNativeError("NULL not allowed");

					return Data_Fail;

				}

			} else if (index == 0) {

				if (data->decflags & VDECODE_FLAG_ALLOWWORLD)

				{

					pEntity = gamehelpers->ReferenceToEntity(0);

				} else {

					pContext->ThrowNativeError("World not allowed");

					return Data_Fail;

				}

			} else {

				pEntity = gamehelpers->ReferenceToEntity(param);

				if (!pEntity)

				{

					pContext->ThrowNativeError("Entity %d is not valid", param);

					return Data_Fail;

				}

			}

			CBaseEntity **ebuf = (CBaseEntity **)buffer;

			*ebuf = pEntity;

			return Data_Okay;

		}

	case Valve_Edict:

		{

			edict_t *pEdict;

			if (data->decflags & VDECODE_FLAG_BYREF)

			{

				cell_t *addr;

				pContext->LocalToPhysAddr(param, &addr);

				param = *addr;

			}

			if (param >= 1 && param <= playerhelpers->GetMaxClients())

			{

				IGamePlayer *player = playerhelpers->GetGamePlayer(param);

				if ((data->decflags & VDECODE_FLAG_ALLOWNOTINGAME)

					&& !player->IsConnected())

				{

					pContext->ThrowNativeError("Client %d is not connected", param);

					return Data_Fail;

				} else if (!player->IsInGame()) {

					pContext->ThrowNativeError("Client %d is not in game", param);

					return Data_Fail;

				}

				pEdict = player->GetEdict();

			} else if (param == -1) {

				if (data->decflags & VDECODE_FLAG_ALLOWNULL)

				{

					pEdict = NULL;

				} else {

					pContext->ThrowNativeError("NULL not allowed");

					return Data_Fail;

				}

			} else if (param == 0) {

				if (data->decflags & VDECODE_FLAG_ALLOWWORLD)

				{

					pEdict = PEntityOfEntIndex(0);

				} else {

					pContext->ThrowNativeError("World not allowed");

					return Data_Fail;

				}

			} else {

				pEdict = PEntityOfEntIndex(param);

				if (!pEdict || pEdict->IsFree())

				{

					pContext->ThrowNativeError("Entity %d is not valid or is freed", param);

					return Data_Fail;

				}

			}

			edict_t **ebuf = (edict_t **)buffer;

			*ebuf = pEdict;

			return Data_Okay;

		}

	case Valve_POD:

	case Valve_Float:

		{

			if (data->decflags & VDECODE_FLAG_BYREF)

			{

				cell_t *addr;

				pContext->LocalToPhysAddr(param, &addr);

				param = *addr;

			}

			if (data->flags & PASSFLAG_ASPOINTER)

			{

				*(void **)buffer = (unsigned char *)_buffer + pCall->stackEnd + data->obj_offset;

				buffer = *(void **)buffer;

			}

			*(cell_t *)buffer = param;

			return Data_Okay;

		}

	case Valve_Bool:

		{

			if (data->decflags & VDECODE_FLAG_BYREF)

			{

				cell_t *addr;

				pContext->LocalToPhysAddr(param, &addr);

				param = *addr;