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/*
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 * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include "compat.h"
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#include <ctype.h>
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#include <fnmatch.h>
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#include <string.h>
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#include "parser.h"
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#include "telescope.h"
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#include "utils.h"
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static int	check_for_utf8(char*);
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static const struct parser_table {
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	const char	*mediatype;
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	void		(*parserinit)(struct parser*);
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} ptable[] = {
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	{ "text/gemini",	gemtext_initparser },
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	{ "text/x-patch",	textpatch_initparser },
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	{ "text/x-diff",	textpatch_initparser },
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	{ "application/x-patch",textpatch_initparser },
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	{ "text/*",		textplain_initparser },
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	{ NULL, NULL}
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};
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static int
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check_for_utf8(char *b)
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{
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	for (;;) {
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		while (*b != '\0' && isspace(*b))
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			b++;
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		if (*b == '\0')
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			break;
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		if (strncmp(b, "charset=", 8) != 0) {
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			while (*b != '\0' && *b != ';')
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				b++;
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			if (*b == '\0')
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				break;
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			b++;
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			continue;
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		}
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		/* is charset= */
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		b += strlen("charset=");
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		/* TODO: improve the matching */
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		return !strncmp(b, "ASCII", 5) || !strncmp(b, "ascii", 5) ||
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			!strncmp(b, "UTF-8", 5) || !strncmp(b, "utf-8", 5);
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	}
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	return 1;
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}
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int
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setup_parser_for(struct tab *tab)
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{
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	char *b, buf[GEMINI_URL_LEN] = {0};
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	const struct parser_table *t;
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	memcpy(buf, tab->meta, sizeof(tab->meta));
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	for (b = buf; *b != ';' && *b != '\0'; ++b)
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		;
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	if (*b == ';') {
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		*b = '\0';
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		++b;
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	}
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	if (!check_for_utf8(b))
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		return 0;
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	for (t = ptable; t->mediatype != NULL; ++t) {
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		if (!fnmatch(t->mediatype, buf, 0)) {
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			parser_init(tab, t->parserinit);
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			return 1;
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		}
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	}
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	return 0;
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}