/**

 * vim: set ts=4 :

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

 * SourceMod

 * Copyright (C) 2004-2007 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 <sh_list.h>

#include <sh_string.h>

#include "sm_trie.h"

#include "sm_globals.h"

#include "PluginSys.h"

#include "sourcemod.h"

#include "sm_stringutil.h"

using namespace SourceHook;

static cell_t s_curparams[SP_MAX_EXEC_PARAMS+1];

static FakeNative *s_curnative = NULL;

static IPluginContext *s_curcaller = NULL;

cell_t FakeNativeRouter(IPluginContext *pContext, const cell_t *params, void *pData)

{

	FakeNative *native = (FakeNative *)pData;

	/* Check if too many parameters were passed */

	if (params[0] > SP_MAX_EXEC_PARAMS)

	{

		return pContext->ThrowNativeError("Called native with too many parameters (%d>%d)", params[9], SP_MAX_EXEC_PARAMS);

	}

	/* Check if the native is paused */

	sp_context_t *pNativeCtx = native->ctx->GetContext();

	if ((pNativeCtx->flags & SPFLAG_PLUGIN_PAUSED) == SPFLAG_PLUGIN_PAUSED)

	{

		return pContext->ThrowNativeError("Plugin owning this native is currently paused.");

	}

	CPlugin *pCaller = g_PluginSys.GetPluginByCtx(pContext->GetContext());

	/* Save any old data on the stack */

	FakeNative *pSaveNative = s_curnative;

	IPluginContext *pSaveCaller = s_curcaller;

	cell_t save_params[SP_MAX_EXEC_PARAMS+1];

	if (pSaveNative != NULL)

	{

		/* Copy all old parameters */

		for (cell_t i=0; i<=s_curparams[0]; i++)

		{

			save_params[i] = s_curparams[i];

		}

	}

	/* Save the current parameters */

	s_curnative = native;

	s_curcaller = pContext;

	for (cell_t i=0; i<=params[0]; i++)

	{

		s_curparams[i] = params[i];

	}

	/* Push info and execute. */

	cell_t result = 0;

	native->call->PushCell(pCaller->GetMyHandle());

	native->call->PushCell(params[0]);

	int error;

	if ((error=native->call->Execute(&result)) != SP_ERROR_NONE)

	{

		if (pContext->GetContext()->n_err == SP_ERROR_NONE)

		{

			pContext->ThrowNativeErrorEx(error, "Error encountered while processing a dynamic native");

		}

	}

	/* Restore everything from the stack if necessary */

	s_curnative = pSaveNative;

	s_curcaller = pSaveCaller;

	if (pSaveNative != NULL)

	{

		for (cell_t i=0; i<=save_params[0]; i++)

		{

			s_curparams[i] = save_params[i];

		}

	}

	return result;

}

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

{

	char *name;

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

	IPluginFunction *pFunction = pContext->GetFunctionById(params[2]);

	if (!pFunction)

	{

		return pContext->ThrowNativeError("Function %x is not a valid function", params[2]);

	}

	if (!g_PluginSys.AddFakeNative(pFunction, name, FakeNativeRouter))

	{

		return pContext->ThrowNativeError("Fatal error creating dynamic native!");

	}

	return 1;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	g_SourceMod.SetGlobalTarget(LANG_SERVER);

	char buffer[512];

	g_SourceMod.FormatString(buffer, sizeof(buffer), pContext, params, 2);

	if (pContext->GetContext()->n_err != SP_ERROR_NONE)

	{

		s_curcaller->ThrowNativeError("Error encountered while processing a dynamic native");

	} else {

		s_curcaller->ThrowNativeErrorEx(params[1], "%s", buffer);

	}

	return 0;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	int err;

	char *str;

	if ((err=s_curcaller->LocalToString(s_curparams[param], &str)) != SP_ERROR_NONE)

	{

		return err;

	}

	cell_t *addr;

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

	*addr = (cell_t)strlen(str);

	return SP_ERROR_NONE;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	int err;

	char *str;

	if ((err=s_curcaller->LocalToString(s_curparams[param], &str)) != SP_ERROR_NONE)

	{

		return err;

	}

	size_t bytes = 0;

	pContext->StringToLocalUTF8(params[2], params[3], str, &bytes);

	cell_t *addr;

	pContext->LocalToPhysAddr(params[4], &addr);

	*addr = (cell_t)bytes;

	return SP_ERROR_NONE;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	char *str;

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

	int err;

	size_t bytes = 0;

	if (params[4])

	{

		err = s_curcaller->StringToLocalUTF8(s_curparams[param], params[3], str, &bytes);

	} else {

		err = s_curcaller->StringToLocal(s_curparams[param], params[3], str);

		/* Eww */

		bytes = strlen(str);

		if (bytes >= (size_t)params[3])

		{

			bytes = params[3] - 1;

		}

	}

	if (err != SP_ERROR_NONE)

	{

		return err;

	}

	cell_t *addr;

	pContext->LocalToPhysAddr(params[5], &addr);

	*addr = (cell_t)bytes;

	return SP_ERROR_NONE;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	return s_curparams[param];

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	cell_t *addr;

	if (s_curcaller->LocalToPhysAddr(s_curparams[param], &addr) != SP_ERROR_NONE)

	{

		return s_curcaller->ThrowNativeErrorEx(SP_ERROR_INVALID_ADDRESS, "Invalid address value");

	}

	return *addr;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	cell_t *addr;

	if (s_curcaller->LocalToPhysAddr(s_curparams[param], &addr) != SP_ERROR_NONE)

	{

		return s_curcaller->ThrowNativeErrorEx(SP_ERROR_INVALID_ADDRESS, "Invalid address value");

	}

	*addr = params[2];

	return 1;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	int err;

	cell_t *addr;

	if ((err=s_curcaller->LocalToPhysAddr(s_curparams[param], &addr)) != SP_ERROR_NONE)

	{

		return err;

	}

	cell_t *src;

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

	memcpy(src, addr, sizeof(cell_t) * params[3]);

	return SP_ERROR_NONE;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	cell_t param = params[1];

	if (param < 1 || param > s_curparams[0])

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", param);

	}

	int err;

	cell_t *addr;

	if ((err=s_curcaller->LocalToPhysAddr(s_curparams[param], &addr)) != SP_ERROR_NONE)

	{

		return err;

	}

	cell_t *src;

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

	memcpy(addr, src, sizeof(cell_t) * params[3]);

	return SP_ERROR_NONE;

}

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

{

	if (!s_curnative || (s_curnative->ctx != pContext))

	{

		return pContext->ThrowNativeError("Not called from inside a native function");

	}

	int out_param = params[1];

	int fmt_param = params[2];

	int var_param = params[3];

	/* Validate input */

	if (out_param && (out_param < 1 || out_param > s_curparams[0]))

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", out_param);

	}

	if (fmt_param && (fmt_param < 1 || fmt_param > s_curparams[0]))

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", fmt_param);

	}

	if (var_param && (var_param < 1 || var_param > s_curparams[0] + 1))

	{

		return pContext->ThrowNativeErrorEx(SP_ERROR_PARAM, "Invalid parameter number: %d", fmt_param);

	}

	/* Get buffer information */

	int err;

	char *output_buffer;

	char *format_buffer;

	if (out_param)

	{

		if ((err=s_curcaller->LocalToString(s_curparams[out_param], &output_buffer)) != SP_ERROR_NONE)

		{

			return err;

		}

	} else {

		pContext->LocalToString(params[6], &output_buffer);

	}

	if (fmt_param)

	{

		if ((err=s_curcaller->LocalToString(s_curparams[fmt_param], &format_buffer)) != SP_ERROR_NONE)

		{

			return err;

		}

	} else {

		pContext->LocalToString(params[7], &format_buffer);

	}

	/* Get maximum length */

	size_t maxlen = (size_t)params[4];

	/* Do the format */

	size_t written = atcprintf(output_buffer, maxlen, format_buffer, s_curcaller, s_curparams, &var_param);

	cell_t *addr;

	pContext->LocalToPhysAddr(params[5], &addr);

	*addr = (cell_t)written;

	return s_curcaller->GetContext()->n_err;

}

//tee hee

REGISTER_NATIVES(nativeNatives)

{

	{"CreateNative",			CreateNative},

	{"GetNativeArray",			GetNativeArray},

	{"GetNativeCell",			GetNativeCell},

	{"GetNativeCellRef",		GetNativeCellRef},

	{"GetNativeString",			GetNativeString},

	{"GetNativeStringLength",	GetNativeStringLength},

	{"FormatNativeString",		FormatNativeString},

	{"ThrowNativeError",		ThrowNativeError},

	{"SetNativeArray",			SetNativeArray},

	{"SetNativeCellRef",		SetNativeCellRef},

	{"SetNativeString",			SetNativeString},

	{NULL,						NULL},

};