<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2023 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM 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.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Classes\FieldValidators\User\UserName;

use Espo\Core\FieldValidation\Validator;
use Espo\Core\FieldValidation\Validator\Data;
use Espo\Core\FieldValidation\Validator\Failure;
use Espo\Core\Utils\Config;
use Espo\Entities\User;
use Espo\ORM\Entity;
use RuntimeException;

/**
 * @implements Validator<User>
 */
class Valid implements Validator
{
    private Config $config;

    public function __construct(Config $config) {
        $this->config = $config;
    }

    /**
     * @param User $entity
     */
    public function validate(Entity $entity, string $field, Data $data): ?Failure
    {
        $value = $entity->getUserName();

        if ($value === null) {
            return null;
        }

        /** @var ?string $regExp */
        $regExp = $this->config->get('userNameRegularExpression');

        if (!$regExp) {
            throw new RuntimeException("No `userNameRegularExpression` in config.");
        }

        if (strpos($value, ' ') !== false) {
            return Failure::create();
        }

        if (preg_replace("/{$regExp}/", '_', $value) !== $value) {
            return Failure::create();
        }

        return null;
    }
}
