/**

 * 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 <stdlib.h>

#include <sh_string.h>

#include "extension.h"

#include "vcallbuilder.h"

#include "vnatives.h"

#include "vhelpers.h"

#include "vglobals.h"

#include "CellRecipientFilter.h"

#include <inetchannel.h>

#include <iclient.h>

#include "iserver.h"

SourceHook::List<ValveCall *> g_RegCalls;

SourceHook::List<ICallWrapper *> g_CallWraps;

inline void InitPass(ValvePassInfo &info, ValveType vtype, PassType type, unsigned int flags, unsigned int decflags=0)

{

	info.decflags = decflags;

	info.encflags = 0;

	info.flags = flags;

	info.type = type;

	info.vtype = vtype;

}

#define START_CALL() \

	unsigned char *vptr = pCall->stk_get();

#define FINISH_CALL_SIMPLE(vret) \

	pCall->call->Execute(vptr, vret); \

	pCall->stk_put(vptr);

#define ENCODE_VALVE_PARAM(num, which, vnum) \

	if (EncodeValveParam(pContext, \

			params[num], \

			pCall, \

			&pCall->which[vnum], \

			vptr) \

		== Data_Fail) \

	{ \

		return 0; \

	}

#define DECODE_VALVE_PARAM(num, which, vnum) \

	if (DecodeValveParam(pContext, \

			params[num], \

			pCall, \

			&pCall->which[vnum], \

			vptr) \

		== Data_Fail) \

	{ \

		return 0; \

	}

bool CreateBaseCall(const char *name,

						  ValveCallType vcalltype,

						  const ValvePassInfo *retinfo,

						  const ValvePassInfo params[],

						  unsigned int numParams,

						  ValveCall **vaddr)

{

	int offset;

	ValveCall *call;

	if (g_pGameConf->GetOffset(name, &offset))

	{

		call = CreateValveVCall(offset, vcalltype, retinfo, params, numParams);

		if (call)

		{

			g_RegCalls.push_back(call);

		}

		*vaddr = call;

		return true;

	} else {

		void *addr = NULL;

		if (g_pGameConf->GetMemSig(name, &addr) && addr != NULL)

		{

			call = CreateValveCall(addr, vcalltype, retinfo, params, numParams);

			if (call)

			{

				g_RegCalls.push_back(call);

			}

			*vaddr = call;

			return true;

		}

	}

	return false;

}

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		ValvePassInfo pass[2];

		InitPass(pass[0], Valve_CBaseEntity, PassType_Basic, PASSFLAG_BYVAL);

		InitPass(pass[1], Valve_Bool, PassType_Basic, PASSFLAG_BYVAL);

		if (!CreateBaseCall("RemovePlayerItem", ValveCall_Player, &pass[1], pass, 1, &pCall))

		{

			return pContext->ThrowNativeError("\"RemovePlayerItem\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"RemovePlayerItem\" wrapper failed to initialized");

		}

	}

	bool ret;

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	DECODE_VALVE_PARAM(2, vparams, 0);

	FINISH_CALL_SIMPLE(&ret);

	return ret ? 1 : 0;

}

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		ValvePassInfo pass[3];

		InitPass(pass[0], Valve_String, PassType_Basic, PASSFLAG_BYVAL);

		InitPass(pass[1], Valve_POD, PassType_Basic, PASSFLAG_BYVAL);

		InitPass(pass[2], Valve_CBaseEntity, PassType_Basic, PASSFLAG_BYVAL);

		if (!CreateBaseCall("GiveNamedItem", ValveCall_Player, &pass[2], pass, 2, &pCall))

		{

			return pContext->ThrowNativeError("\"GiveNamedItem\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"GiveNamedItem\" wrapper failed to initialized");

		}

	}

	CBaseEntity *pEntity = NULL;

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	DECODE_VALVE_PARAM(2, vparams, 0);

	DECODE_VALVE_PARAM(3, vparams, 1);

	FINISH_CALL_SIMPLE(&pEntity);

	if (pEntity == NULL)

	{

		return -1;

	}

	edict_t *pEdict = gameents->BaseEntityToEdict(pEntity);

	if (!pEdict)

	{

		return -1;

	}

	return IndexOfEdict(pEdict);

}

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		ValvePassInfo pass[2];

		InitPass(pass[0], Valve_POD, PassType_Basic, PASSFLAG_BYVAL);

		InitPass(pass[1], Valve_CBaseEntity, PassType_Basic, PASSFLAG_BYVAL);

		if (!CreateBaseCall("Weapon_GetSlot", ValveCall_Player, &pass[1], pass, 1, &pCall))

		{

			return pContext->ThrowNativeError("\"Weapon_GetSlot\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"Weapon_GetSlot\" wrapper failed to initialized");

		}

	}

	CBaseEntity *pEntity;

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	DECODE_VALVE_PARAM(2, vparams, 0);

	FINISH_CALL_SIMPLE(&pEntity);

	if (pEntity == NULL)

	{

		return -1;

	}

	edict_t *pEdict = gameents->BaseEntityToEdict(pEntity);

	if (!pEdict)

	{

		return -1;

	}

	return IndexOfEdict(pEdict);

}

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		ValvePassInfo pass[4];

		InitPass(pass[0], Valve_Float, PassType_Float, PASSFLAG_BYVAL);

		InitPass(pass[1], Valve_Bool, PassType_Basic, PASSFLAG_BYVAL);

		InitPass(pass[2], Valve_Float, PassType_Float, PASSFLAG_BYVAL);

		InitPass(pass[3], Valve_Bool, PassType_Basic, PASSFLAG_BYVAL);

		if (!CreateBaseCall("Ignite", ValveCall_Entity, NULL, pass, 4, &pCall))

		{

			return pContext->ThrowNativeError("\"Ignite\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"Ignite\" wrapper failed to initialized");

		}

	}

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	DECODE_VALVE_PARAM(2, vparams, 0);

	DECODE_VALVE_PARAM(3, vparams, 1);

	DECODE_VALVE_PARAM(4, vparams, 2);

	DECODE_VALVE_PARAM(5, vparams, 3);

	FINISH_CALL_SIMPLE(NULL);

	return 1;

}

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		if (!CreateBaseCall("Extinguish", ValveCall_Entity, NULL, NULL, 0, &pCall))

		{

			return pContext->ThrowNativeError("\"Extinguish\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"Extinguish\" wrapper failed to initialized");

		}

	}

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	FINISH_CALL_SIMPLE(NULL);

	return 1;

}

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		ValvePassInfo pass[3];

		InitPass(pass[0], Valve_Vector, PassType_Basic, PASSFLAG_BYVAL, VDECODE_FLAG_ALLOWNULL);

		InitPass(pass[1], Valve_QAngle, PassType_Basic, PASSFLAG_BYVAL, VDECODE_FLAG_ALLOWNULL);

		InitPass(pass[2], Valve_Vector, PassType_Basic, PASSFLAG_BYVAL, VDECODE_FLAG_ALLOWNULL);

		if (!CreateBaseCall("Teleport", ValveCall_Entity, NULL, pass, 3, &pCall))

		{

			return pContext->ThrowNativeError("\"Teleport\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"Teleport\" wrapper failed to initialized");

		}

	}

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	DECODE_VALVE_PARAM(2, vparams, 0);

	DECODE_VALVE_PARAM(3, vparams, 1);

	DECODE_VALVE_PARAM(4, vparams, 2);

	FINISH_CALL_SIMPLE(NULL);

	return 1;

}

#if SOURCE_ENGINE >= SE_ORANGEBOX

/* :TODO: This is Team Fortress 2 specific */

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		ValvePassInfo pass[2];

		InitPass(pass[0], Valve_Bool, PassType_Basic, PASSFLAG_BYVAL);

		InitPass(pass[1], Valve_Bool, PassType_Basic, PASSFLAG_BYVAL);

		if (!CreateBaseCall("CommitSuicide", ValveCall_Player, NULL, pass, 2, &pCall))

		{

			return pContext->ThrowNativeError("\"CommitSuicide\" not supported by this mod");

		}

		else if (!pCall)

		{

			return pContext->ThrowNativeError("\"CommitSuicide\" wrapper failed to initialized");

		}

	}

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	*(bool *)(vptr + 4) = false;

	*(bool *)(vptr + 5) = false;

	FINISH_CALL_SIMPLE(NULL);

	return 1;

}

#else

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

{

	static ValveCall *pCall = NULL;

	if (!pCall)

	{

		if (!CreateBaseCall("CommitSuicide", ValveCall_Player, NULL, NULL, 0, &pCall))

		{

			return pContext->ThrowNativeError("\"CommitSuicide\" not supported by this mod");

		} else if (!pCall) {

			return pContext->ThrowNativeError("\"CommitSuicide\" wrapper failed to initialized");

		}

	}

	START_CALL();

	DECODE_VALVE_PARAM(1, thisinfo, 0);

	FINISH_CALL_SIMPLE(NULL);

	return 1;

}

#endif

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

{

	IGamePlayer *player = playerhelpers->GetGamePlayer(params[1]);

	if (player == NULL)

	{

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

	}

	if (!player->IsInGame())

	{

		return pContext->ThrowNativeError("Client %d is not in game", params[1]);

	}

	edict_t *pEdict = PEntityOfEntIndex(params[2]);

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

	{

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

	}

	engine->SetView(player->GetEdict(), pEdict);

	return 1;

}

static SourceHook::String *g_lightstyle[MAX_LIGHTSTYLES] = {NULL};

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

{

	int style = params[1];

	if (style >= MAX_LIGHTSTYLES)

	{

		return pContext->ThrowNativeError("Light style %d is invalid (range: 0-%d)", style, MAX_LIGHTSTYLES - 1);

	}

	if (g_lightstyle[style] == NULL)

	{

		/* We allocate and never free this because the Engine wants to hold onto it :\

		 * in theory we could hook light style and know whether we're supposed to free 

		 * this or not on shutdown, but for ~4K of memory MAX, it doesn't seem worth it yet.

		 * So, it's a :TODO:!

		 */

		g_lightstyle[style] = new SourceHook::String();

	}

	char *str;

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

	g_lightstyle[style]->assign(str);

	engine->LightStyle(style, g_lightstyle[style]->c_str());

	return 1;

}

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

{

	static bool s_slap_supported = false;

	static bool s_slap_setup = false;

	static ICallWrapper *s_teleport = NULL;

	static int s_health_offs = 0;

	static int s_sound_count = 0;

	static int s_frag_offs = 0;

	if (!s_slap_setup)

	{

		int tries = 0;

		s_slap_setup = true;

		if (IsTeleportSupported())

		{

			tries++;

		}

		if (IsGetVelocitySupported())

		{

			tries++;

		}

		/* Setup health */

		if (g_pGameConf->GetOffset("m_iHealth", &s_health_offs) && s_health_offs)

		{

			tries++;

		}

		if (tries == 3)

		{

			s_slap_supported = true;

			const char *key;

			if ((key = g_pGameConf->GetKeyValue("SlapSoundCount")) != NULL)

			{

				s_sound_count = atoi(key);

			}

		}

	}

	if (!s_slap_supported)

	{

		return pContext->ThrowNativeError("This function is not supported on this mod");

	}

	/* First check if the client is valid */

	int client = params[1];

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

	if (!player)

	{

		return pContext->ThrowNativeError("Client %d is not valid", client);

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

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

	}

	edict_t *pEdict = player->GetEdict();

	CBaseEntity *pEntity = pEdict->GetUnknown()->GetBaseEntity();

	/* See if we should be taking away health */

	bool should_slay = false;

	if (params[2])

	{

		int *health = (int *)((char *)pEntity + s_health_offs);

		if (*health - params[2] <= 0)

		{

			*health = 1;

			should_slay = true;

		} else {

			*health -= params[2];

		}

	}

	/* Teleport in a random direction - thank you, Mani!*/

	Vector velocity;

	GetVelocity(pEntity, &velocity, NULL);

	velocity.x += ((rand() % 180) + 50) * (((rand() % 2) == 1) ?  -1 : 1);

	velocity.y += ((rand() % 180) + 50) * (((rand() % 2) == 1) ?  -1 : 1);

	velocity.z += rand() % 200 + 100;

	Teleport(pEntity, NULL, NULL, &velocity);

	/* Play a random sound */

	if (params[3] && s_sound_count > 0)

	{

		char name[48];

		const char *sound_name;

		cell_t player_list[256], total_players = 0;

		int maxClients = playerhelpers->GetMaxClients();

		int r = (rand() % s_sound_count) + 1;

		snprintf(name, sizeof(name), "SlapSound%d", r);

		if ((sound_name = g_pGameConf->GetKeyValue(name)) != NULL)

		{

			IGamePlayer *other;

			for (int i=1; i<=maxClients; i++)

			{

				other = playerhelpers->GetGamePlayer(i);

				if (other->IsInGame())

				{

					player_list[total_players++] = i;

				}

			}

			const Vector & pos = pEdict->GetCollideable()->GetCollisionOrigin();

			CellRecipientFilter rf;

			rf.SetToReliable(true);

			rf.Initialize(player_list, total_players);

			engsound->EmitSound(rf, client, CHAN_AUTO, sound_name, VOL_NORM, ATTN_NORM, 0, PITCH_NORM, &pos);

		}

	}

	if (!s_frag_offs)

	{

		const char *frag_prop = g_pGameConf->GetKeyValue("m_iFrags");

		if (frag_prop)

		{

			datamap_t *pMap = gamehelpers->GetDataMap(pEntity);

			typedescription_t *pType = gamehelpers->FindInDataMap(pMap, frag_prop);

			if (pType != NULL)

			{

				s_frag_offs = pType->fieldOffset[TD_OFFSET_NORMAL];

			}

		}

		if (!s_frag_offs)

		{

			s_frag_offs = -1;

		}

	}

	int old_frags = 0;

	if (s_frag_offs > 0)

	{

		old_frags = *(int *)((char *)pEntity + s_frag_offs);

	}

	/* Force suicide */

	if (should_slay)

	{

		pluginhelpers->ClientCommand(pEdict, "kill\n");

	}

	if (s_frag_offs > 0)

	{

		*(int *)((char *)pEntity + s_frag_offs) = old_frags;

	}

	return 1;

}

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

{

	IGamePlayer *player = playerhelpers->GetGamePlayer(params[1]);

	if (player == NULL)