<?php
namespace WapplerSystems\Meilisearch\Domain\Search\ResultSet\Facets;

/***************************************************************
 *  Copyright notice
 *
 *  (c) 2017- Timo Hund <timo.hund@dkd.de>
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project 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.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script 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.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/

/**
 * Expression for facet sorting
 *
 * @author Timo Hund <timo.hund@dkd.de>
 * @author Jens Jacobsen <jens.jacobsen@ueberbit.de>
 */
class SortingExpression
{
    /**
     * Return expression for facet sorting
     *
     * @param string $sorting
     * @return string
     */
    public function getForFacet($sorting)
    {
        $noSortingSet = $sorting !== 0 && $sorting !== FALSE && empty($sorting);
        $sortingIsCount = $sorting === 'count' || $sorting === 1 || $sorting === '1' || $sorting === TRUE;
        if ($noSortingSet) {
            return '';
        } elseif ($sortingIsCount) {
            return 'count';
        } else {
            return 'index';
        }
    }

    /**
     * Return expression for facet sorting combined with direction
     *
     * @param string $sorting
     * @param string $direction
     * @return string
     */
    public function getForJsonFacet($sorting, $direction)
    {
        $isMetricSorting = strpos($sorting, 'metrics_') === 0;
        $expression = $isMetricSorting ? $sorting : $this->getForFacet($sorting);
        $direction = strtolower($direction);
        if (!empty($direction) && in_array($direction, ['asc', 'desc'])) {
            $expression .= ' ' . $direction;
        }
        return $expression;
    }
}
