/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 <https://www.gnu.org/licenses/>.
 */

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <time.h>

#include "archive.h"

static int htmlEscape(FILE *file, const char *str) {
	while (*str) {
		int n = 0;
		switch (*str) {
			break; case '"': n = fprintf(file, "&quot;"); str++;
			break; case '&': n = fprintf(file, "&amp;"); str++;
			break; case '<': n = fprintf(file, "&lt;"); str++;
			break; case '>': n = fprintf(file, "&gt;"); str++;
		}
		if (n < 0) return n;
		size_t len = strcspn(str, "\"&<>");
		if (len) {
			size_t n = fwrite(str, len, 1, file);
			if (!n) return -1;
		}
		str += len;
	}
	return 0;
}

static const char *Summary = TEMPLATE(
	<details id="[messageID]">
	<summary>
		<h1><a href="#[messageID]">[subject]</a></h1>
		<address>
			<a href="mailto:[from.mailbox]@[from.host]">[from.name]</a>
		</address>
	</summary>
);

int htmlEnvelope(FILE *file, const struct Envelope *envelope) {
	const char *fromName = envelope->from.name;
	if (!fromName) fromName = envelope->from.mailbox;

	struct Variable vars[] = {
		{ "subject", envelope->subject },
		{ "from.name", fromName },
		{ "from.mailbox", envelope->from.mailbox },
		{ "from.host", envelope->from.host },
		{ "messageID", envelope->messageID },
		{0},
	};
	return templateRender(file, Summary, vars, htmlEscape);
}