<?php

/**
 * 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; under version 2
 * of the License (non-upgradable).
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2020 (original work) Open Assessment Technologies SA;
 */

declare(strict_types=1);

namespace oat\tao\model\resources\relation\service;

use oat\generis\model\OntologyAwareTrait;
use oat\oatbox\service\ConfigurableService;
use oat\tao\model\resources\relation\FindAllQuery;
use oat\tao\model\resources\relation\ResourceRelationCollection;
use oat\tao\model\resources\relation\exception\NestedClassLimitExceededException;

class ItemResourceRelationService extends ConfigurableService implements ResourceRelationServiceInterface
{
    public const SERVICE_ID = 'tao/ItemResourceRelationService';
    public const OPTION_NESTED_CLASS_LIMIT = 'nestedClassLimit';

    use OntologyAwareTrait;

    public function findRelations(FindAllQuery $query): ResourceRelationCollection
    {
        $nestedClassLimit = $this->getOption(self::OPTION_NESTED_CLASS_LIMIT);

        if ($query->getClassId() && $nestedClassLimit !== null) {
            $class = $this->getClass($query->getClassId());

            if (count($class->getSubClasses(true)) > (int)$nestedClassLimit) {
                throw new NestedClassLimitExceededException($nestedClassLimit);
            }
        }

        return new ResourceRelationCollection(...[]);
    }
}