/**

 * vim: set ts=4 :

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

 * Source SDK Hooks Extension

 * Copyright (C) 2010-2012 Nicholas Hastings

 * Copyright (C) 2009-2010 Erik Minekus

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

 *

 * 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 "natives.h"

#include <compat_wrappers.h>

#if defined SH_DECL_MANUALEXTERN1

SH_DECL_MANUALEXTERN1(OnTakeDamage, int, CTakeDamageInfoHack &);

SH_DECL_MANUALEXTERN3_void(Weapon_Drop, CBaseCombatWeapon *, const Vector *, const Vector *);

#endif

cell_t Native_Hook(IPluginContext *pContext, const cell_t *params)

{

	int entity = (int)params[1];

	SDKHookType type = (SDKHookType)params[2];

	IPluginFunction *callback = pContext->GetFunctionById(params[3]);

	HookReturn ret = g_Interface.Hook(entity, type, callback);

	switch (ret)

	{

		case HookRet_InvalidEntity:

			pContext->ThrowNativeError("Entity %d is invalid", entity);

			break;

		case HookRet_InvalidHookType:

			pContext->ThrowNativeError("Invalid hook type specified");

			break;

		case HookRet_NotSupported:

			pContext->ThrowNativeError("Hook type not supported on this game");

			break;

		case HookRet_BadEntForHookType:

		{

			const char * pClassname = gamehelpers->GetEntityClassname(PEntityOfEntIndex(gamehelpers->ReferenceToIndex(params[1])));

			if (!pClassname)

			{

				pContext->ThrowNativeError("Hook type not valid for this type of entity (%i).", entity);

			}

			else

			{

				pContext->ThrowNativeError("Hook type not valid for this type of entity (%s)", pClassname);

			}

			break;

		}

	}

	return 0;

}

cell_t Native_HookEx(IPluginContext *pContext, const cell_t *params)

{

	int entity = (int)params[1];

	SDKHookType type = (SDKHookType)params[2];

	IPluginFunction *callback = pContext->GetFunctionById(params[3]);

	HookReturn ret = g_Interface.Hook(entity, type, callback);

	if (ret == HookRet_Successful)

		return true;

	return false;

}

cell_t Native_Unhook(IPluginContext *pContext, const cell_t *params)

{

	int entity = (int)params[1];

	SDKHookType type = (SDKHookType)params[2];

	IPluginFunction *callback = pContext->GetFunctionById(params[3]);

	for(int i = g_HookList.Count() - 1; i >= 0; i--)

	{

		if(g_HookList[i].entity == entity && g_HookList[i].type == type && g_HookList[i].callback == callback)

			g_Interface.Unhook(i);

	}

	return 0;

}

cell_t Native_TakeDamage(IPluginContext *pContext, const cell_t *params)

{

// todo: fix code to not require this >.<

#if !defined SH_DECL_MANUALEXTERN1

	pContext->ThrowNativeError("SDKHooks_TakeDamage is not supported on this engine.");

#else

	CBaseEntity *pVictim = UTIL_GetCBaseEntity(params[1]);

	if (!pVictim)

		return pContext->ThrowNativeError("Invalid entity index %d for victim", params[1]);

	CBaseEntity *pInflictor = UTIL_GetCBaseEntity(params[2]);

	if (!pInflictor)

		return pContext->ThrowNativeError("Invalid entity index %d for inflictor", params[2]);

	CBaseEntity *pAttacker = NULL;

	if (params[3] != -1)

	{

		pAttacker = UTIL_GetCBaseEntity(params[3]);

		if (!pAttacker)

		{

			return pContext->ThrowNativeError("Invalid entity index %d for attackerr", params[3]);

		}

	}

	float flDamage = sp_ctof(params[4]);

	int iDamageType = params[5];

	CBaseEntity *pWeapon = NULL;

	if (params[6] != -1)

	{

		pAttacker = UTIL_GetCBaseEntity(params[6]);

		if (!pAttacker)

		{

			return pContext->ThrowNativeError("Invalid entity index %d for weapon", params[6]);

		}

	}

	Vector vecDamageForce = Vector(0.0f, 0.0f, 0.0f);

	cell_t *addr;

	int err;

	if ((err = pContext->LocalToPhysAddr(params[7], &addr)) != SP_ERROR_NONE)

	{

		return pContext->ThrowNativeError("Could not read damageForce vector");

	}

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

	{

		vecDamageForce = Vector(

			sp_ctof(addr[0]),

			sp_ctof(addr[1]),

			sp_ctof(addr[2]));

	}

	Vector vecDamagePosition = vec3_origin;

	if ((err = pContext->LocalToPhysAddr(params[8], &addr)) != SP_ERROR_NONE)

	{

		return pContext->ThrowNativeError("Could not read damagePosition vector");

	}

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

	{

		vecDamagePosition = Vector(

			sp_ctof(addr[0]),

			sp_ctof(addr[1]),

			sp_ctof(addr[2]));

	}

	CTakeDamageInfoHack info(pInflictor, pAttacker, flDamage, iDamageType, pWeapon, vecDamageForce, vecDamagePosition);

	SH_MCALL(pVictim, OnTakeDamage)((CTakeDamageInfoHack &)info);

#endif

	return 0;

}

cell_t Native_DropWeapon(IPluginContext *pContext, const cell_t *params)

{

// todo: fix code to not require this >.<

#if !defined SH_DECL_MANUALEXTERN1

	pContext->ThrowNativeError("SDKHooks_DropWeapon is not supported on this engine.");

#else

	CBaseEntity *pPlayer = UTIL_GetCBaseEntity(params[1], true);

	if (!pPlayer)

		return pContext->ThrowNativeError("Invalid client index %d", params[1]);

	CBaseEntity *pWeapon = UTIL_GetCBaseEntity(params[2]);

	if (!pWeapon)

		return pContext->ThrowNativeError("Invalid entity index %d for weapon", params[2]);

	sm_sendprop_info_t spi;

	IServerUnknown *pUnk = (IServerUnknown *)pWeapon;

	IServerNetworkable *pNet = pUnk->GetNetworkable();

	if (!UTIL_FindDataTable(pNet->GetServerClass()->m_pTable, "DT_BaseCombatWeapon", &spi, 0))

		return pContext->ThrowNativeError("Entity index %d is not a weapon", params[2]);

	if (!gamehelpers->FindSendPropInfo("CBaseCombatWeapon", "m_hOwnerEntity", &spi))

		return pContext->ThrowNativeError("Invalid entity index %d for weapon", params[2]);

	CBaseHandle &hndl = *(CBaseHandle *)((uint8_t *)pWeapon + spi.actual_offset);

	if (params[1] != hndl.GetEntryIndex())

		return pContext->ThrowNativeError("Weapon %d is not owned by client %d", params[2], params[1]);

	Vector vecTarget;

	cell_t *addr;

	int err;

	if ((err = pContext->LocalToPhysAddr(params[3], &addr)) != SP_ERROR_NONE)

	{

		return pContext->ThrowNativeError("Could not read vecTarget vector");

	}

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

	{

		vecTarget = Vector(

			sp_ctof(addr[0]),

			sp_ctof(addr[1]),

			sp_ctof(addr[2]));

	}

	else

	{

		SH_MCALL(pPlayer, Weapon_Drop)((CBaseCombatWeapon *)pWeapon, NULL, NULL);

		return 0;

	}

	Vector vecVelocity;

	if ((err = pContext->LocalToPhysAddr(params[8], &addr)) != SP_ERROR_NONE)

	{

		return pContext->ThrowNativeError("Could not read vecVelocity vector");

	}

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

	{

		vecVelocity = Vector(

			sp_ctof(addr[0]),

			sp_ctof(addr[1]),

			sp_ctof(addr[2]));

	}

	else

	{

		SH_MCALL(pPlayer, Weapon_Drop)((CBaseCombatWeapon *)pWeapon, &vecTarget, NULL);

		return 0;

	}

	SH_MCALL(pPlayer, Weapon_Drop)((CBaseCombatWeapon *)pWeapon, &vecTarget, &vecVelocity);

#endif

	return 0;

}