/**

 * vim: set ts=4 :

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

 * 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 <string.h>

#include <stdlib.h>

#include "sm_globals.h"

#include "sm_stringutil.h"

#include "TextParsers.h"

#include <ctype.h>

inline const char *_strstr(const char *str, const char *substr)

{

#ifdef PLATFORM_WINDOWS

	return strstr(str, substr);

#elif defined PLATFORM_LINUX

	return (const char *)strstr(str, substr);

#endif

}

/*********************************************

*                                            *

* STRING MANIPULATION NATIVE IMPLEMENTATIONS *

*                                            *

*********************************************/

static cell_t sm_strlen(IPluginContext *pCtx, const cell_t *params)

{

	char *str;

	pCtx->LocalToString(params[1], &str);

	return strlen(str);

}

static cell_t sm_contain(IPluginContext *pCtx, const cell_t *params)

{

	typedef const char *(*STRSEARCH)(const char *, const char *);

	STRSEARCH func;

	char *str, *substr;

	pCtx->LocalToString(params[1], &str);

	pCtx->LocalToString(params[2], &substr);

	func = (params[3]) ? _strstr : stristr;

	const char *pos = func(str, substr);

	if (pos)

	{

		return (pos - str);

	}

	return -1;

}

static cell_t sm_strcmp(IPluginContext *pCtx, const cell_t *params)

{

	typedef int (*STRCOMPARE)(const char *, const char *);

	STRCOMPARE func;

	char *str1, *str2;

	pCtx->LocalToString(params[1], &str1);

	pCtx->LocalToString(params[2], &str2);

	func = (params[3]) ? strcmp : stricmp;

	return (func(str1, str2));

}

static cell_t sm_strncmp(IPluginContext *pCtx, const cell_t *params)

{

	char *str1, *str2;

	pCtx->LocalToString(params[1], &str1);

	pCtx->LocalToString(params[2], &str2);

	if  (params[4])

	{

		return strncmp(str1, str2, (size_t)params[3]);

	} else {

		return strncasecmp(str1, str2, (size_t)params[3]);

	}

}

static cell_t sm_strcopy(IPluginContext *pCtx, const cell_t *params)

{

	char *dest, *src;

	pCtx->LocalToString(params[1], &dest);

	pCtx->LocalToString(params[3], &src);

	return strncopy(dest, src, params[2]);

}

static cell_t sm_strconvint(IPluginContext *pCtx, const cell_t *params)

{

	char *str, *dummy;

	pCtx->LocalToString(params[1], &str);

	return static_cast<cell_t>(strtol(str, &dummy, params[2]));

}

static cell_t sm_numtostr(IPluginContext *pCtx, const cell_t *params)

{

	char *str;

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

	size_t res = UTIL_Format(str, params[3], "%d", params[1]);

	return static_cast<cell_t>(res);

}

static cell_t sm_strtofloat(IPluginContext *pCtx, const cell_t *params)

{

	char *str, *dummy;

	pCtx->LocalToString(params[1], &str);

	float val = (float)strtod(str, &dummy);

	return sp_ftoc(val);

}

static cell_t sm_floattostr(IPluginContext *pCtx, const cell_t *params)

{

	char *str;

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

	size_t res = UTIL_Format(str, params[3], "%f", sp_ctof(params[1]));

	return static_cast<cell_t>(res);

}

static cell_t sm_formatex(IPluginContext *pCtx, const cell_t *params)

{

	char *buf, *fmt;

	size_t res;

	int arg = 4;

	pCtx->LocalToString(params[1], &buf);

	pCtx->LocalToString(params[3], &fmt);

	res = atcprintf(buf, static_cast<size_t>(params[2]), fmt, pCtx, params, &arg);

	return static_cast<cell_t>(res);

}

static char g_formatbuf[2048];

static cell_t sm_format(IPluginContext *pCtx, const cell_t *params)

{

	char *buf, *fmt, *destbuf;

	cell_t start_addr, end_addr, maxparam;

	size_t res, maxlen;

	int arg = 4;

	bool copy = false;

	pCtx->LocalToString(params[1], &destbuf);

	pCtx->LocalToString(params[3], &fmt);

	maxlen = static_cast<size_t>(params[2]);

	start_addr = params[1];

	end_addr = params[1] + maxlen;

	maxparam = params[0];

	for (cell_t i=3; i<=maxparam; i++)

	{

		if ((params[i] >= start_addr) && (params[i] <= end_addr))

		{

			copy = true;

			break;

		}

	}

	buf = (copy) ? g_formatbuf : destbuf;

	res = atcprintf(buf, maxlen, fmt, pCtx, params, &arg);

	if (copy)

	{

		memcpy(destbuf, g_formatbuf, res+1);

	}

	return static_cast<cell_t>(res);

}

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

{

	int vargPos = static_cast<int>(params[4]);

	/* Get the parent parameter array */

	sp_context_t *ctx = pContext->GetContext();

	cell_t *local_params = (cell_t *)(ctx->memory + ctx->frm + (2 * sizeof(cell_t)));

	cell_t max = local_params[0];

	if (vargPos > (int)max + 1)

	{

		return pContext->ThrowNativeError("Argument index is invalid: %d", vargPos);

	}

	cell_t addr_start = params[1];

	cell_t addr_end = addr_start + params[2];

	bool copy = false;

	for (int i=vargPos; i<=max; i++)

	{

		/* Does this clip bounds? */

		if ((local_params[i] >= addr_start)

			&& (local_params[i] <= addr_end))

		{

			copy = true;

			break;

		}

	}

	/* Get destination info */

	char *format, *destination;

	size_t maxlen = static_cast<size_t>(params[2]);

	if (copy)

	{

		destination = g_formatbuf;

	} else {

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

	}

	pContext->LocalToString(params[3], &format);

	size_t total = atcprintf(destination, maxlen, format, pContext, local_params, &vargPos);

	/* Perform copy-on-write if we need to */

	if (copy)

	{

		pContext->StringToLocal(params[1], maxlen, g_formatbuf);

	}

	return total;

}

/* :TODO: make this UTF8 safe */

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

{

	const char *input;

	char *out;

	size_t outMax;

	/* Get parameters */

	pContext->LocalToString(params[1], (char **)&input);

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

	outMax = params[3];

	const char *inptr = input;

	/* Eat up whitespace */

	while (*inptr != '\0' && IsWhitespace(inptr))

	{

		inptr++;

	}

	if (*inptr == '\0')

	{

		if (outMax)

		{

			*out = '\0';

		}

		return -1;

	}

	const char *start, *end = NULL;

	bool quoted = (*inptr == '"');

	if (quoted)

	{

		inptr++;

		start = inptr;

		/* Read input until we reach a quote. */

		while (*inptr != '\0' && *inptr != '"')

		{

			/* Update the end point, increment the stream. */

			end = inptr++;

		}

		/* Read one more token if we reached an end quote */

		if (*inptr == '"')

		{

			inptr++;

		}

	} else {

		start = inptr;

		/* Read input until we reach a space */

		while (*inptr != '\0' && !IsWhitespace(inptr))

		{

			/* Update the end point, increment the stream. */

			end = inptr++;

		}

	}

	/* Copy the string we found, if necessary */

	if (end == NULL)

	{

		if (outMax)

		{

			*out = '\0';

		}

	} else if (outMax) {

		char *outptr = out;

		outMax--;

		for (const char *ptr=start;

			(ptr <= end) && ((unsigned)(outptr - out) < (outMax));

			ptr++, outptr++)

			{

			*outptr = *ptr;

		}

		*outptr = '\0';

	}

	/* Consume more of the string until we reach non-whitespace */

	while (*inptr != '\0' && IsWhitespace(inptr))

	{

		inptr++;

	}

	if (*inptr == '\0')

	{

		return -1;

	}

	return inptr - input;

}

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

{

	char *str;

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

	return _GetUTF8CharBytes(str);

};

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

{

	char chr = params[1];

	if (_GetUTF8CharBytes(&chr) != 1)

	{

		return 0;

	}

	return isalpha(chr);

}

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

{

	char chr = params[1];

	if (_GetUTF8CharBytes(&chr) != 1)

	{

		return 0;

	}

	return isdigit(chr);

}

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

{

	char chr = params[1];

	if (_GetUTF8CharBytes(&chr) != 1)

	{

		return 0;

	}

	return isspace(chr);

}

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

{

	char chr = params[1];

	unsigned int bytes = _GetUTF8CharBytes(&chr);

	if (bytes == 1)

	{

		return 0;

	}

	return bytes;

}

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

{

	char chr = params[1];

	if (_GetUTF8CharBytes(&chr) != 1)

	{

		return 0;

	}

	return isupper(chr);

}

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

{

	char chr = params[1];

	if (_GetUTF8CharBytes(&chr) != 1)

	{

		return 0;

	}

	return islower(chr);

}

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

{

	char *text, *search, *replace;

	size_t maxlength;

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

	pContext->LocalToString(params[3], &search);

	pContext->LocalToString(params[4], &replace);

	maxlength = (size_t)params[2];

	return  UTIL_ReplaceAll(text, maxlength, search, replace);

}

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

{

	char *text, *search, *replace;

	size_t maxlength;

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

	pContext->LocalToString(params[3], &search);

	pContext->LocalToString(params[4], &replace);

	maxlength = (size_t)params[2];

	size_t searchLen = (params[5] == -1) ? strlen(search) : (size_t)params[5];

	size_t replaceLen = (params[6] == -1) ? strlen(replace) : (size_t)params[6];

	char *ptr = UTIL_ReplaceEx(text, maxlength, search, searchLen, replace, replaceLen);

	if (ptr == NULL)

	{

		return -1;

	}

	return ptr - text;

}

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

{

	char *str;

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

	size_t chars = strlen(str);

	if (chars == 0)

	{

		return 0;

	}

	char *end = str + chars - 1;

	/* Iterate backwards through string until we reach first non-whitespace char */

	while (end >= str && IsWhitespace(end))

	{

		end--;

	}

	/* Replace first whitespace char (at the end) with null terminator */

	*(end + 1) = '\0';

	/* Iterate forwards through string until first non-whitespace char is reached */

	while (IsWhitespace(str))

	{

		str++;

	}

	size_t bytes;

	pContext->StringToLocalUTF8(params[1], chars + 1, str, &bytes);

	return bytes;

}

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

{

	char *text, *split;

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

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

	size_t maxLen = (size_t)params[4];

	size_t textLen = strlen(text);

	size_t splitLen = strlen(split);

	if (splitLen > textLen)

	{

		return -1;

	}

	for (size_t i=0; i<textLen - splitLen; i++)

	{

		if (strncmp(&text[i], split, splitLen) == 0)

		{

			/* Split hereeeee */

			if (i >= maxLen)

			{

				pContext->StringToLocalUTF8(params[3], maxLen, text, NULL);

			} else {

				pContext->StringToLocalUTF8(params[3], i+1, text, NULL);

			}

			return (cell_t)(i + splitLen);

		}

	}

	return -1;

}

REGISTER_NATIVES(basicStrings)

{

	{"BreakString",			BreakString},

	{"FloatToString",		sm_floattostr},

	{"Format",				sm_format},

	{"FormatEx",			sm_formatex},

	{"GetCharBytes",		GetCharBytes},

	{"IntToString",			sm_numtostr},

	{"IsCharAlpha",			IsCharAlpha},

	{"IsCharLower",			IsCharLower},

	{"IsCharMB",			IsCharMB},

	{"IsCharNumeric",		IsCharNumeric},

	{"IsCharSpace",			IsCharSpace},

	{"IsCharUpper",			IsCharUpper},

	{"ReplaceString",		ReplaceString},

	{"ReplaceStringEx",		ReplaceStringEx},

	{"SplitString",			SplitString},

	{"strlen",				sm_strlen},

	{"StrBreak",			BreakString},		/* Backwards compat shim */

	{"StrContains",			sm_contain},

	{"strcmp",				sm_strcmp},

	{"StrCompare",			sm_strcmp},			/* Backwards compat shim */

	{"strncmp",				sm_strncmp},

	{"strcopy",				sm_strcopy},

	{"StrCopy",				sm_strcopy},		/* Backwards compat shim */

	{"StringToInt",			sm_strconvint},

	{"StringToFloat",		sm_strtofloat},

	{"TrimString",			TrimString},

	{"VFormat",				sm_vformat},

	{NULL,					NULL},

};