<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2022 webtrees development team
 * This program 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.
 * This program 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.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace Fisharebest\Webtrees\Elements;

use Fisharebest\Webtrees\Tree;
use Ramsey\Uuid\Exception\RandomSourceException;
use Ramsey\Uuid\Uuid;

use function dechex;
use function hexdec;
use function strtolower;
use function strtoupper;
use function strtr;
use function substr;

/**
 * UID fields
 */
class Uid extends AbstractElement
{
    protected const MAXIMUM_LENGTH = 36;

    /**
     * Create a default value for this element.
     *
     * @param Tree $tree
     *
     * @return string
     */
    public function default(Tree $tree): string
    {
        try {
            if ($tree->getPreference('GENERATE_UIDS') === '1') {
                return strtolower(Uuid::uuid4()->toString());
            }
        } catch (RandomSourceException $ex) {
        }

        return '';
    }
}