<?php
namespace WapplerSystems\Meilisearch\FieldProcessor;

/***************************************************************
 *  Copyright notice
 *
 *  (c) 2009-2015 Andreas Allacher <andreas.allacher@cyberhouse.at>
 *  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!
 ***************************************************************/

use WapplerSystems\Meilisearch\System\DateTime\FormatService;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * A field processor that converts timestamps to ISO dates as needed by Solr
 *
 * @author Andreas Allacher <andreas.allacher@cyberhouse.at>
 */
class TimestampToUtcIsoDate implements FieldProcessor
{

    /**
     * Expects a timestamp and converts it to an ISO 8601 date in UTC as needed by Solr.
     *
     * Example date output format: 1995-12-31T23:59:59Z
     * The trailing "Z" designates UTC time and is mandatory
     *
     * @param array $values Array of values, an array because of multivalued fields
     * @return array Modified array of values
     */
    public function process(array $values)
    {
        $results = [];
        $formatService = GeneralUtility::makeInstance(FormatService::class);

        foreach ($values as $timestamp) {
            $results[] = $formatService->timestampToUtcIso($timestamp);
        }

        return $results;
    }
}
