<?php
/**
 * Runs the cleanup tasks enabled in settings.
 *
 * @package Akantio\Cache
 */

declare(strict_types=1);

namespace Akantio\Cache\Application\Database;

use Akantio\Cache\Domain\Settings\Settings;

final class DatabaseCleaner {

	private const TASKS = [
		'db_revisions'          => 'revisions',
		'db_auto_drafts'        => 'auto_drafts',
		'db_trashed_posts'      => 'trashed_posts',
		'db_spam_comments'      => 'spam_comments',
		'db_trashed_comments'   => 'trashed_comments',
		'db_expired_transients' => 'expired_transients',
		'db_optimize_tables'    => 'optimized_tables',
	];

	/**
	 * @param DatabaseMaintenance $maintenance Maintenance port.
	 */
	public function __construct( private readonly DatabaseMaintenance $maintenance ) {
	}

	public const COUNTABLE = [ 'revisions', 'auto_drafts', 'trashed_posts', 'spam_comments', 'trashed_comments', 'expired_transients' ];

	/**
	 * What each cleanup would remove right now, whether enabled or not.
	 *
	 * @return array<string, int>
	 */
	public function candidates(): array {
		$counts = [];
		foreach ( self::COUNTABLE as $task ) {
			$counts[ $task ] = $this->maintenance->count( $task );
		}

		return $counts;
	}

	/**
	 * Runs enabled tasks.
	 *
	 * @param Settings $settings Settings.
	 * @return array<string, int> Removed per task.
	 */
	public function clean( Settings $settings ): array {
		$removed = [];
		foreach ( self::TASKS as $setting => $task ) {
			if ( $settings->get( $setting ) ) {
				$removed[ $task ] = $this->maintenance->run( $task );
			}
		}

		return $removed;
	}
}