<?php
/**
 * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
 *
 * Copyright (C) 2019 - 2022 Jan Böhmer (https://github.com/jbtronics)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace App\Helpers\Trees;

use ArrayIterator;
use RecursiveIterator;

final class TreeViewNodeIterator extends ArrayIterator implements RecursiveIterator
{
    /**
     * @param TreeViewNode[] $nodes
     */
    public function __construct($nodes)
    {
        parent::__construct($nodes);
    }

    public function hasChildren(): bool
    {
        /** @var TreeViewNode $element */
        $element = $this->current();

        return $element->getNodes() !== null && $element->getNodes() !== [];
    }

    public function getChildren(): TreeViewNodeIterator
    {
        /** @var TreeViewNode $element */
        $element = $this->current();

        return new self($element->getNodes());
    }
}