<?php

namespace League\CommonMark\Extension\TableOfContents;

use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Extension\CommonMark\Node\Block\Heading;
use League\CommonMark\Extension\HeadingPermalink\HeadingPermalink;
use League\CommonMark\Extension\TableOfContents\Node\TableOfContents;
use League\CommonMark\Extension\TableOfContents\Node\TableOfContentsPlaceholder;
use League\CommonMark\Node\Block\Document;
use League\CommonMark\Node\NodeIterator;
use League\Config\ConfigurationAwareInterface;
use League\Config\ConfigurationInterface;
use League\Config\Exception\InvalidConfigurationException;

final class TableOfContentsBuilder implements ConfigurationAwareInterface
{
    public const POSITION_TOP = 'top';
    public const POSITION_BEFORE_HEADINGS = 'before-headings';
    public const POSITION_PLACEHOLDER = 'placeholder';

    /** @psalm-readonly-allow-private-mutation */
    private ConfigurationInterface $config;

    public function onDocumentParsed(DocumentParsedEvent $event): void
    {
        $document = $event->getDocument();

        $generator = new TableOfContentsGenerator(
            (string) $this->config->get('table_of_contents/style'),
            (string) $this->config->get('table_of_contents/normalize'),
            (int) $this->config->get('table_of_contents/min_heading_level'),
            (int) $this->config->get('table_of_contents/max_heading_level'),
            (string) $this->config->get('heading_permalink/fragment_prefix'),
        );

        $toc = $generator->generate($document);
        if ($toc === null) {
            // No linkable headers exist, so no TOC could be generated
            return;
        }

        // Add custom CSS class(es), if defined
        $class = $this->config->get('table_of_contents/html_class');
        if ($class !== null) {
            $toc->data->append('attributes/class', $class);
        }

        // Add the TOC to the Document
        $position = $this->config->get('table_of_contents/position');
        if ($position === self::POSITION_TOP) {
            $document->prependChild($toc);
        } elseif ($position === self::POSITION_BEFORE_HEADINGS) {
            $this->insertBeforeFirstLinkedHeading($document, $toc);
        } elseif ($position === self::POSITION_PLACEHOLDER) {
            $this->replacePlaceholders($document, $toc);
        } else {
            throw InvalidConfigurationException::forConfigOption('table_of_contents/position', $position);
        }
    }

    private function insertBeforeFirstLinkedHeading(Document $document, TableOfContents $toc): void
    {
        foreach ($document->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) {
            if (! $node instanceof Heading) {
                continue;
            }

            foreach ($node->children() as $child) {
                if ($child instanceof HeadingPermalink) {
                    $node->insertBefore($toc);

                    return;
                }
            }
        }
    }

    private function replacePlaceholders(Document $document, TableOfContents $toc): void
    {
        foreach ($document->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) {
            // Add the block once we find a placeholder
            if (! $node instanceof TableOfContentsPlaceholder) {
                continue;
            }

            $node->replaceWith(clone $toc);
        }
    }

    public function setConfiguration(ConfigurationInterface $configuration): void
    {
        $this->config = $configuration;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTMxOTkwNzY5NzAwNjI5NSA5MTkzNTM2MzQ2OTEyMDUgNzgwMTUyMDE2Njc0NDQ1Nw==