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/* 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 <sysexits.h>
#include <time.h>

#include "archive.h"

static const char *Envelope = TEMPLATE(
	<entry>
	<title>[subject]</title>
	<author>
		<name>[from.name]</name>
		<email>[from.mailbox]@[from.host]</email>
	</author>
	<updated>[date]</updated>
	<id>[id]</id>
);

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

	char date[sizeof("0000-00-00T00:00:00Z")];
	strftime(date, sizeof(date), "%FT%TZ", gmtime(&envelope->utc));

	struct Variable idVars[] = {
		{ "messageID", envelope->messageID },
		{0},
	};
	char *id = templateURL("mailto:?In-Reply-To=[messageID]", idVars);

	struct Variable vars[] = {
		{ "subject", envelope->subject },
		{ "from.name", from },
		{ "from.mailbox", envelope->from.mailbox },
		{ "from.host", envelope->from.host },
		{ "date", date },
		{ "id", id },
		{0},
	};
	int error = templateRender(file, Envelope, vars, escapeXML);
	free(id);
	return error;
}