/*************************************************************************
* (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: url.c,v 1.3 2010/03/22 15:21:20 misho Exp $
*
*************************************************************************/
#include "global.h"


/*
 * ioURLGet() Parse and get data from input URL
 * @csURL = Input URL line
 * @url = Output parsed URL
 * return: 0 error format not find tech:// and return URL like path; 
 		-1 error:: can`t read; >0 ok, up bits for known elements
*/
int ioURLGet(const char *csURL, struct tagIOURL *url)
{
	char *pos, *at, *cl, *sl;
	int ret = 0;

	if (!url)
		return -1;
	else
		memset(url, 0, sizeof(*url));

	strlcpy((char*) url->url_line, csURL, BUFSIZ);
	// Tech
	if (!(pos = strstr((char*) url->url_line, "://"))) {
		url->url_path.vallen = strlen((char*) url->url_line);
		url->url_path.value = (char*) url->url_line;
		return ret;
	} else {
		url->url_tech.value = (char*) url->url_line;
		url->url_tech.vallen = pos - (char*) url->url_line;
		if (url->url_tech.vallen)
			ret |= 1;

		*pos = 0;
		pos += 3;
	}

	// User
	if ((at = strchr(pos, '@'))) {
		*at++ = 0;
		// Pass
		if ((cl = strchr(pos, ':'))) {
			*cl++ = 0;

			url->url_pass.value = cl;
			url->url_pass.vallen = at - cl - 1;
			if (url->url_pass.vallen)
				ret |= 4;
		} else
			cl = at;

		url->url_user.value = pos;
		url->url_user.vallen = cl - pos - 1;
		if (url->url_user.vallen)
			ret |= 2;

		pos = at;
	}

	// Host
	if ((sl = strchr(pos, '/')))
		*sl++ = 0;
	else
		sl = pos + strlen(pos) + 1;
	// Port
	if ((cl = strchr(pos, ':'))) {
		*cl++ = 0;

		url->url_port.value = cl;
		url->url_port.vallen = sl - cl - 1;
		if (url->url_port.vallen)
			ret |= 16;
	} else
		cl = sl;

	url->url_host.value = pos;
	url->url_host.vallen = cl - pos - 1;
	if (url->url_host.vallen)
		ret |= 8;

	pos = sl;

	// Args
	if ((at = strchr(pos, '?'))) {
		*at++ = 0;

		url->url_args.value = at;
		url->url_args.vallen = strlen(at);
		if (url->url_args.vallen)
			ret |= 64;
	} else
		at = pos + strlen(pos) + 1;

	// Path
	url->url_path.value = pos;
	url->url_path.vallen = at - pos - 1;
	if (url->url_path.vallen)
		ret |= 32;

	pos = at + strlen(at);

	// Reserved
	url->url_reserved = pos;
	if (*pos)
		ret |= 128;

	return ret;
}

/*
 * io_MakeArray() Parse and make array of arguments values ... 
 *	(input string will be modified! and output array must be free)
 * @psArgs = Input arguments line, after execute string is modified!!!
 * @csDelim = Delimiter(s) for separate
 * @args = Output array of arguments ... (must be free() after procced function!)
 * @nargs = Maximum requested count of arguments from input string psArgs
 * return: 0 error format; -1 error:: can`t read; >0 ok, number of readed items
*/
inline int io_MakeArray(char * __restrict psArgs, const char *csDelim, char *** __restrict args, int nargs)
{
	char **app;
	register int i;

	if (!psArgs || !csDelim || !args || !nargs)
		return -1;
	if (!(*args = malloc(sizeof(char*) * nargs))) {
		LOGERR;
		return -1;
	} else
		memset(*args, 0, sizeof(char*) * nargs);

	for (i = 0, app = *args; app < *args + nargs && (*app = strsep(&psArgs, csDelim)); 
				**app ? i++ : i, **app ? app++ : app);
	return i;
}
/*
 * io_SizeArray() Parse and calculate size of array
 * @csArgs = Input arguments line
 * @csDelim = Delimiter(s) for separate
 * return: 0 error format; -1 error:: can`t read; >0 ok, number of items
*/
inline int io_SizeArray(const char *csArgs, const char *csDelim)
{
	register int res;
	char *pos;

	if (!csArgs || !csDelim)
		return -1;

	for (res = 1, pos = (char*) csArgs; (pos = strpbrk(pos, csDelim)); res++, pos++);
	return res;
}
/*
 * io_MakeAV() Parse and make attribute/value pair
 * @csArgs = Input argument line
 * @csDelim = Delimiter for separate
 * @psAttr = Output Attribute
 * @attrLen = Size of attribute array
 * @psValue = Output Value, if ==NULL this element not present value or not wanted for return
 * @valLen = Size of value array
 * return: 0 error format; -1 error:: can`t read; >0 ok, number of readed items
*/
inline int io_MakeAV(const char * __restrict csArgs, const char *csDelim, 
		char * __restrict psAttr, int attrLen, char * __restrict psValue, int valLen)
{
	register int ret = 0;
	char *pos, *psBuf;

	if (!csArgs || !csDelim || !psAttr || !attrLen)
		return -1;
	if (psValue && !valLen)
		return -1;
	else
		memset(psValue, 0, valLen);
	psBuf = strdup(csArgs);
	if (!psBuf) {
		LOGERR;
		return -1;
	}

	pos = strpbrk(psBuf, csDelim);
	if (pos)
		*pos++ = 0;
	ret++;
	strlcpy(psAttr, psBuf, attrLen);

	if (pos && *pos) {
		ret++;
		if (psValue)
			strlcpy(psValue, pos, valLen);
	}

	free(psBuf);
	return ret;
}

/*
 * io_Path2File() Parse and make path/filename pair
 * @csArgs = Input argument line
 * @psPath = Output Path, if ==NULL path not returned
 * @pathLen = Size of path array
 * @psFile = Output File
 * @fileLen = Size of file array
 * return: 0 error format; -1 error:: can`t read; >0 ok, number of readed items
*/
inline int io_Path2File(const char * __restrict csArgs, char * __restrict psPath, int pathLen, 
		char * __restrict psFile, int fileLen)
{
	char *pos, *psBuf;

	if (!csArgs || !psFile || !fileLen)
		return -1;
	if (psPath && !pathLen)
		return -1;
	else
		memset(psPath, 0, pathLen);
	psBuf = strdup(csArgs);
	if (!psBuf) {
		LOGERR;
		return -1;
	}

	pos = strrchr(psBuf, '/');
	if (!pos) {
		strlcpy(psFile, psBuf, fileLen);

		free(psBuf);
		return 1;
	} else
		*pos++ = 0;

	strlcpy(psFile, pos, fileLen);
	if (psPath)
		strlcpy(psPath, psBuf, pathLen);

	free(psBuf);
	return 2;
}

/*
 * ioURLGetValue() Get value from parsed URL
 * @url = Input parsed URL
 * @csAttr = Attribute for search
 * @psValue = Return value of attribute, if ==NULL only check for existence of attribute
 * @valLen = Size of psValue array
 * return: 0 error attribute not find; -1 error:: can`t read; >0 ok, find at position
*/
int ioURLGetValue(struct tagIOURL *url, const char *csAttr, char * __restrict psValue, int valLen)
{
	register int i, ret = 0;
	char szBuf[BUFSIZ], **items, szElem[2][BUFSIZ];
	int len;

	if (!url || !csAttr)
		return -1;

	strlcpy(szBuf, url->url_args.value, BUFSIZ);
	if (io_MakeArray(szBuf, "&", &items, (len = io_SizeArray(szBuf, "&"))) < 1)
		return ret;

	for (i = 0; i < len && items[i]; i++) {
		if (io_MakeAV(items[i], "=", szElem[0], BUFSIZ, szElem[1], BUFSIZ) < 1)
			continue;

		if (!strcmp(szElem[0], csAttr)) {
			ret = i + 1;
			if (psValue && valLen)
				strlcpy(psValue, szElem[1], valLen);
			break;
		}
	}

	free(items);
	return ret;
}

/*
 * ioURLGetFile() Get file from parsed URL
 * @url = Input parsed URL
 * @psValue = Return filename, if not specified file in url path, replace with /
 * @valLen = Size of psValue array
 * return: -1 error:: can`t read; 0 ok
*/
int ioURLGetFile(struct tagIOURL *url, char * __restrict psValue, int valLen)
{
	if (!url || !psValue || !valLen)
		return -1;

	if (io_Path2File(url->url_path.value, NULL, 0, psValue, valLen) < 1)
		return -1;

	// If not specified file in path, default replace to /
	if (!*psValue)
		strlcpy(psValue, "/", valLen);
	return 0;
}