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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 <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>

#include "archive.h"
#include "imap.h"

static uint32_t threadRoot(struct List thread) {
	if (!thread.len) errx(EX_PROTOCOL, "empty thread");
	while (thread.ptr[0].type == List) {
		thread = thread.ptr[0].list;
		if (!thread.len) errx(EX_PROTOCOL, "empty subthread");
	}
	if (thread.ptr[0].type != Number) errx(EX_PROTOCOL, "invalid thread root");
	return thread.ptr[0].number;
}

enum Atom concatFetch(FILE *imap, struct List threads) {
	enum Atom tag = atom("concatFetch");
	fprintf(imap, "%s UID FETCH ", Atoms[tag]);
	for (size_t i = 0; i < threads.len; ++i) {
		if (threads.ptr[i].type != List) errx(EX_PROTOCOL, "invalid thread");
		uint32_t root = threadRoot(threads.ptr[i].list);
		fprintf(imap, "%s%" PRIu32, (i ? "," : ""), root);
	}
	fprintf(imap, " (UID ENVELOPE)\r\n");
	return tag;
}