/**

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

 * SourceMod (C)2004-2007 AlliedModders LLC.  All rights reserved.

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

 *

 * This file is not open source and may not be copied without explicit

 * written permission of AlliedModders LLC.  This file may not be redistributed 

 * in whole or significant part.

 * For information, see LICENSE.txt or http://www.sourcemod.net/license.php

 *

 * Version: $Id$

 */

#include "sm_globals.h"

#include "sourcemod.h"

#include "sourcemm_api.h"

#include "server_class.h"

#include "CPlayerManager.h"

#include "CHalfLife2.h"

inline edict_t *GetEdict(cell_t num)

{

	edict_t *pEdict = engine->PEntityOfEntIndex(num);

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

	{

		return NULL;

	}

	if (num > 0 && num < g_Players.GetMaxClients())

	{

		CPlayer *pPlayer = g_Players.GetPlayerByIndex(num);

		if (!pPlayer || !pPlayer->IsConnected())

		{

			return NULL;

		}

	}

	return pEdict;

}

inline edict_t *GetEntity(cell_t num, CBaseEntity **pData)

{

	edict_t *pEdict = engine->PEntityOfEntIndex(num);

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

	{

		return NULL;

	}

	if (num > 0 && num < g_Players.GetMaxClients())

	{

		CPlayer *pPlayer = g_Players.GetPlayerByIndex(num);

		if (!pPlayer || !pPlayer->IsConnected())

		{

			return NULL;

		}

	}

	IServerUnknown *pUnk;

	if ((pUnk=pEdict->GetUnknown()) == NULL)

	{

		return NULL;

	}

	*pData = pUnk->GetBaseEntity();

	return pEdict;

}

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

{

	return gpGlobals->maxEntities;

}

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

{

	edict_t *pEdict = engine->CreateEdict();

	if (!pEdict)

	{

		return 0;

	}

	return engine->IndexOfEdict(pEdict);

}

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

{

	edict_t *pEdict = engine->PEntityOfEntIndex(params[1]);

	if (!pEdict)

	{

		return pContext->ThrowNativeError("Edict %d is not a valid edict", params[1]);

	}

	engine->RemoveEdict(pEdict);

	return 1;

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

		return 0;

	}

	/* Shouldn't be necessary... not sure though */

	return pEdict->IsFree() ? 0 : 1;

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

		return 0;

	}

	IServerUnknown *pUnknown = pEdict->GetUnknown();

	if (!pUnknown)

	{

		return 0;

	}

	CBaseEntity *pEntity = pUnknown->GetBaseEntity();

	return (pEntity != NULL) ? 1 : 0;

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

		return 0;

	}

	return (pEdict->GetNetworkable() != NULL) ? 1 : 0;

}

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

{

	return engine->GetEntityCount();

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

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

	}

	return pEdict->m_fStateFlags;

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

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

	}

	pEdict->m_fStateFlags = params[2];

	return 1;

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

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

	}

	const char *cls = pEdict->GetClassName();

	if (!cls || cls[0] == '\0')

	{

		return 0;

	}

	pContext->StringToLocal(params[2], params[3], cls);

	return 1;

}

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

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

	}

	IServerNetworkable *pNet = pEdict->GetNetworkable();

	if (!pNet)

	{

		return 0;

	}

	ServerClass *pClass = pNet->GetServerClass();

	pContext->StringToLocal(params[2], params[3], pClass->GetName());

	return 1;

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	switch (params[3])

	{

	case 4:

		return *(int *)((uint8_t *)pEntity + offset);

	case 2:

		return *(short *)((uint8_t *)pEntity + offset);

	case 1:

		return *((uint8_t *)pEntity + offset);

	default:

		return pContext->ThrowNativeError("Integer size %d is invalid", params[3]);

	}

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	if (params[5])

	{

		pEdict->StateChanged(offset);

	}

	switch (params[4])

	{

	case 4:

		{

			*(int *)((uint8_t *)pEntity + offset) = params[3];

			break;

		}

	case 2:

		{

			*(short *)((uint8_t *)pEntity + offset) = params[3];

			break;

		}

	case 1:

		{

			*((uint8_t *)pEntity + offset) = params[3];

			break;

		}

	default:

		return pContext->ThrowNativeError("Integer size %d is invalid", params[4]);

	}

	return 1;

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	float f = *(float *)((uint8_t *)pEntity + offset);

	return sp_ftoc(f);

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	*(float *)((uint8_t *)pEntity + offset) = sp_ctof(params[3]);

	if (params[4])

	{

		pEdict->StateChanged(offset);

	}

	return 1;

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	Vector *v = (Vector *)((uint8_t *)pEntity + offset);

	cell_t *vec;

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

	vec[0] = v->x;

	vec[1] = v->y;

	vec[2] = v->z;

	return 1;

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	Vector *v = (Vector *)((uint8_t *)pEntity + offset);

	cell_t *vec;

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

	v->x = vec[0];

	v->y = vec[1];

	v->z = vec[2];

	if (params[4])

	{

		pEdict->StateChanged(offset);

	}

	return 1;

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	CBaseHandle &hndl = *(CBaseHandle *)((uint8_t *)pEntity + offset);

	if (!hndl.IsValid())

	{

		return 0;

	}

	/* :TODO: check serial no.? */

	return hndl.GetEntryIndex();

}

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

{

	CBaseEntity *pEntity;

	edict_t *pEdict = GetEntity(params[1], &pEntity);

	if (!pEdict || !pEntity)

	{

		return pContext->ThrowNativeError("Entity %d is invalid", params[1]);

	}

	int offset = params[2];

	if (offset < 0 || offset > 32768)

	{

		return pContext->ThrowNativeError("Offset %d is invalid", offset);

	}

	CBaseHandle &hndl = *(CBaseHandle *)((uint8_t *)pEntity + offset);

	if (params[3] == 0)

	{

		hndl.Set(NULL);

	} else {

		edict_t *pEdict = GetEdict(params[3]);

		if (!pEdict)

		{

			return pContext->ThrowNativeError("Entity %d is invalid", params[3]);

		}

		IServerEntity *pEntOther = pEdict->GetIServerEntity();

		hndl.Set(pEntOther);

	}

	if (params[4])

	{

		pEdict->StateChanged(offset);

	}

	return 1;

}

IChangeInfoAccessor *CBaseEdict::GetChangeAccessor()

{

	return engine->GetChangeAccessor( (const edict_t *)this );

}

CSharedEdictChangeInfo *g_pSharedChangeInfo = NULL;

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

{

	edict_t *pEdict = GetEdict(params[1]);

	if (!pEdict)

	{

		return pContext->ThrowNativeError("Edict %d is invalid", params[1]);

	}

	if (!g_pSharedChangeInfo)

	{

		g_pSharedChangeInfo = engine->GetSharedEdictChangeInfo();

	}

	if (params[2])

	{

		pEdict->StateChanged(params[2]);

	} else {

		pEdict->StateChanged();

	}

	return 1;

}

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

{

	char *cls, *prop;

	pContext->LocalToString(params[1], &cls);

	pContext->LocalToString(params[2], &prop);

	SendProp *pSend = g_HL2.FindInSendTable(cls, prop);

	if (!pSend)

	{

		return -1;

	}

	return pSend->GetOffset();

}

REGISTER_NATIVES(entityNatives)

{

	{"ChangeEdictState",		ChangeEdictState},

	{"CreateEdict",				CreateEdict},

	{"FindSendPropOffs",		FindSendPropOffs},

	{"GetEdictClassname",		GetEdictClassname},

	{"GetEdictFlags",			GetEdictFlags},

	{"GetEntData",				GetEntData},

	{"GetEntDataEnt",			GetEntDataEnt},

	{"GetEntDataFloat",			GetEntDataFloat},

	{"GetEntDataVector",		GetEntDataVector},

	{"GetEntityNetClass",		GetEntityNetClass},

	{"GetMaxEntities",			GetMaxEntities},

	{"IsEntNetworkable",		IsEntNetworkable},

	{"IsValidEdict",			IsValidEdict},

	{"IsValidEntity",			IsValidEntity},

	{"RemoveEdict",				RemoveEdict},

	{"SetEdictFlags",			SetEdictFlags},

	{"SetEntData",				SetEntData},

	{"SetEntDataEnt",			SetEntDataEnt},

	{"SetEntDataFloat",			SetEntDataFloat},

	{"SetEntDataVector",		SetEntDataVector},

	{NULL,						NULL}

};