<?php
/**
 * Daily housekeeping.
 *
 * @package OrbitstemSEO
 */

namespace Orbitstem\SEO\Core;

use Orbitstem\SEO\Diagnostics\Tables;
use Orbitstem\SEO\Redirects\NotFoundLog;
use Orbitstem\SEO\Repair\ChangeLog;

defined( 'ABSPATH' ) || exit;

/**
 * Trims the 404 log and removes change-log entries older than the
 * retention setting, once a day on WP-Cron.
 */
class Maintenance {

	const HOOK = 'orbitstem_seo_daily';

	/**
	 * Settings service.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * 404 log.
	 *
	 * @var NotFoundLog
	 */
	private $not_found;

	/**
	 * Change log.
	 *
	 * @var ChangeLog
	 */
	private $changes;

	/**
	 * Constructor.
	 *
	 * @param Settings    $settings  Settings.
	 * @param NotFoundLog $not_found 404 log.
	 * @param ChangeLog   $changes   Change log.
	 */
	public function __construct( Settings $settings, NotFoundLog $not_found, ChangeLog $changes ) {
		$this->settings  = $settings;
		$this->not_found = $not_found;
		$this->changes   = $changes;
	}

	/**
	 * Registers the handler and makes sure the daily event exists.
	 */
	public function register() {
		add_action( self::HOOK, array( $this, 'run' ) );
		if ( ! wp_next_scheduled( self::HOOK ) ) {
			wp_schedule_event( time() + HOUR_IN_SECONDS, 'daily', self::HOOK );
		}
	}

	/**
	 * Runs the housekeeping.
	 *
	 * @return array{not_found:int,changes:int} Rows removed.
	 */
	public function run() {
		if ( ! Tables::v3_ready() ) {
			return array(
				'not_found' => 0,
				'changes'   => 0,
			);
		}
		return array(
			'not_found' => $this->not_found->trim(),
			'changes'   => $this->changes->prune( (int) $this->settings->get( 'change_retention_days' ) ),
		);
	}
}