/* 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 const char *addrName(struct Address addr) {
	return (addr.name ? addr.name : addr.mailbox);
}

static int
htmlAddressList(FILE *file, const char *class, struct AddressList list) {
	if (!list.len) return 0;
	struct Variable vars[] = {
		{ "class", class },
		{0},
	};
	int error = templateRender(
		file, TEMPLATE(<ul class="[class]">), vars, escapeXML
	);
	if (error) return error;
	for (size_t i = 0; i < list.len; ++i) {
		struct Variable vars[] = {
			{ "class", class },
			{ "name", addrName(list.addrs[i]) },
			{0},
		};
		error = templateRender(
			file,
			TEMPLATE(<li><address class="[class]">[name]</address></li>),
			vars,
			escapeXML
		);
		if (error) return error;
	}
	return templateRender(file, TEMPLATE(</ul>), vars, escapeXML);
}

int htmlEnvelope(FILE *file, const struct Envelope *envelope) {
	struct Variable urlVars[] = {
		{ "mailbox", envelope->replyTo.mailbox },
		{ "host", envelope->replyTo.host },
		{ "re", (strncmp(envelope->subject, "Re: ", 4) ? "Re: " : "") },
		{ "subject", envelope->subject },
		{ "messageID", envelope->messageID },
		{0},
	};
	char *fragment = templateURL("#[messageID]", urlVars);
	char *mailto = templateURL(
		"mailto:[mailbox]@[host]?subject=[re][subject]&In-Reply-To=[messageID]",
		urlVars
	);

	char date[256];
	char utc[sizeof("0000-00-00T00:00:00Z")];
	strftime(date, sizeof(date), "%c %z", &envelope->date);
	strftime(utc, sizeof(utc), "%FT%TZ", gmtime(&envelope->utc));
	struct Variable vars[] = {
		{ "messageID", envelope->messageID },
		{ "fragment", fragment },
		{ "subject", envelope->subject },
		{ "mailto", mailto },
		{ "from", addrName(envelope->from) },
		{ "date", date },
		{ "utc", utc },
		{0},
	};
	const char *Summary = TEMPLATE(
		<details class="message" id="[messageID]">
		<summary>
			<h1 class="subject"><a href="[fragment]">[subject]</a></h1>
			<address class="from"><a href="[mailto]">[from]</a></address>
			<time datetime="[utc]">[date]</time>
		</summary>
	);
	int error = templateRender(file, Summary, vars, escapeXML);
	free(fragment);
	free(mailto);
	if (error) return error;

	return 0
		|| htmlAddressList(file, "to", envelope->to)
		|| htmlAddressList(file, "cc", envelope->cc);
}