<?php

/**
 * This file is part of the Froxlor project.
 * Copyright (c) 2010 the Froxlor Team (see authors).
 *
 * 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 2
 * 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, you can also view it online at
 * https://files.froxlor.org/misc/COPYING.txt
 *
 * @copyright  the authors
 * @author     Froxlor team <team@froxlor.org>
 * @license    https://files.froxlor.org/misc/COPYING.txt GPLv2
 */

namespace Froxlor\System;

use League\CommonMark\Exception\CommonMarkException;
use League\CommonMark\GithubFlavoredMarkdownConverter;

class Markdown
{

	private static $converter = null;

	public static function converter(): ?GithubFlavoredMarkdownConverter
	{
		if (is_null(self::$converter)) {
			self::$converter = new GithubFlavoredMarkdownConverter([
				'html_input' => 'strip',
				'allow_unsafe_links' => false,
			]);
		}
		return self::$converter;
	}

	public static function cleanCustomNotes(string $note = ""): string
	{
		if (!empty($note)) {
			try {
				$note = self::converter()->convert($note)->getContent();
			} catch (CommonMarkException $e) {
				$note = "";
			}
		}
		return $note;
	}
}