<?php

/*
 * This file is part of the clockoon/dokuwiki-commonmark-plugin package.
 *
 * (c) Sungbin Jeon <clockoon@gmail.com>
 *
 * Original code based on the followings:
 * - CommonMark JS reference parser (https://bitly.com/commonmark-js) (c) John MacFarlane
 * - league/commonmark (https://github.com/thephpleague/commonmark) (c) Colin O'Dell <colinodell@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace DokuWiki\Plugin\Commonmark\Extension\Renderer\Block;

use League\CommonMark\Block\Element\AbstractBlock;
use League\CommonMark\Block\Element\Heading;
use League\CommonMark\ElementRendererInterface;
use League\CommonMark\Block\Renderer\BlockRendererInterface;

final class HeadingRenderer implements BlockRendererInterface
{
    /**
     * @param Heading                  $block
     * @param ElementRendererInterface $DWRenderer
     * @param bool                     $inTightList
     *
     * @return string
     */
    public function render(AbstractBlock $block, ElementRendererInterface $DWRenderer, bool $inTightList = false)
    {
        if (!($block instanceof Heading)) {
            throw new \InvalidArgumentException('Incompatible block type: ' . \get_class($block));
        }

        $heading = str_repeat('=', max(7 - $block->getLevel(), 1)) . ' ';

        $result = $heading . $DWRenderer->renderInlines($block->children()) . strrev($heading);

        return $result;
    }
}