<?php
/**
 * Performs maintenance tasks. Invoke this periodically if the auto_maintenance configuration option is turned off.
 */

require dirname(__FILE__) . '/inc/cli.php';

function get_reports_by_board(): array {
	$query = prepare("SELECT `board`, `post`, `id` FROM ``reports``");
	$query->execute() or error(db_error($query));
	return $query->fetchAll(PDO::FETCH_GROUP | PDO::FETCH_NUM);
}

function post_ids_by_board(array $reports): array {
	$ret = [];
	foreach ($reports as $board => $values) {
		foreach ($values as $value) {
			$ret[$board] ??= [];
			$ret[$board][] = $value[0];
		}
	}
	return $ret;
}

function filter_invalid_reports(array $board_post_ids, array $reports): array {
	$invalid_reports = [];

	foreach ($board_post_ids as $board => $post_ids) {
		$query = query(sprintf('SELECT `id` FROM ``posts_%s`` WHERE `id` = ' . implode(' OR `id` = ', $post_ids), $board));
		$existing_posts = $query->fetchAll(PDO::FETCH_COLUMN);

		foreach ($reports[$board] as $values) {
			list($post_id, $report_id) = $values;
			if (!in_array($post_id, $existing_posts)) {
				$invalid_reports[] = $report_id;
			}
		}
	}

	return $invalid_reports;
}

function get_report_ids(array $reports): array {
	$ret = [];
	foreach ($reports as $_board => $values) {
		foreach ($values as $value) {
			$report_id = $value[0];
			$ret[] = $report_id;
		}
	}
	return $ret;
}

function delete_reports(array $report_ids): int {
	return query('DELETE FROM ``reports`` WHERE `id` = ' . implode(' OR `id` = ', $report_ids))->rowCount();
}

echo "Clearing expired bans...\n";
$start = microtime(true);
$deleted_count = Bans::purge($config['require_ban_view'], $config['purge_bans']);
$delta = microtime(true) - $start;
echo "Deleted $deleted_count expired bans in $delta seconds!\n";
$time_tot = $delta;
$deleted_tot = $deleted_count;

echo "Clearing old antispam...\n";
$start = microtime(true);
$deleted_count = purge_old_antispam();
$delta = microtime(true) - $start;
echo "Deleted $deleted_count expired antispam in $delta seconds!\n";
$time_tot = $delta;
$deleted_tot += $deleted_count;

echo "Clearing invalid reports...\n";
$start = microtime(true);
$reports = get_reports_by_board();
$report_ids = get_report_ids($reports);
$board_post_ids = post_ids_by_board($reports);
$invalid_reports = filter_invalid_reports($board_post_ids, $reports);
if (!empty($invalid_reports)) {
	$deleted_count = delete_reports($invalid_reports);
} else {
	$deleted_count = 0;
}
$delta = microtime(true) - $start;
echo "Deleted $deleted_count invalid reports in $delta seconds!\n";
$time_tot += $delta;
$deleted_tot += $deleted_count;

if ($config['cache']['enabled'] === 'fs') {
	$fs_cache = new Vichan\Data\Driver\FsCacheDriver(
		$config['cache']['prefix'],
		"tmp/cache/{$config['cache']['prefix']}",
		'.lock',
		false
	);
	$start = microtime(true);
	$fs_cache->collect();
	$delta = microtime(true) - $start;
	echo "Deleted $deleted_count expired filesystem cache items in $delta seconds!\n";
	$time_tot = $delta;
	$deleted_tot = $deleted_count;
}

$time_tot = number_format((float)$time_tot, 4, '.', '');
modLog("Deleted $deleted_tot expired entries in {$time_tot}s with maintenance tool");