<?php

namespace League\CommonMark\Extension\ExternalLink;

use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Extension\CommonMark\Node\Inline\Link;
use League\Config\ConfigurationInterface;

final class ExternalLinkProcessor
{
    public const APPLY_NONE = '';
    public const APPLY_ALL = 'all';
    public const APPLY_EXTERNAL = 'external';
    public const APPLY_INTERNAL = 'internal';

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

    public function __construct(ConfigurationInterface $config)
    {
        $this->config = $config;
    }

    public function __invoke(DocumentParsedEvent $e): void
    {
        $internalHosts   = $this->config->get('external_link/internal_hosts');
        $openInNewWindow = $this->config->get('external_link/open_in_new_window');
        $classes         = $this->config->get('external_link/html_class');

        foreach ($e->getDocument()->iterator() as $link) {
            if (! ($link instanceof Link)) {
                continue;
            }

            $host = \parse_url($link->getUrl(), PHP_URL_HOST);
            if (! \is_string($host)) {
                // Something is terribly wrong with this URL
                continue;
            }

            if (self::hostMatches($host, $internalHosts)) {
                $link->data->set('external', false);
                $this->applyRelAttribute($link, false);
                continue;
            }

            // Host does not match our list
            $this->markLinkAsExternal($link, $openInNewWindow, $classes);
        }
    }

    private function markLinkAsExternal(Link $link, bool $openInNewWindow, string $classes): void
    {
        $link->data->set('external', true);
        $this->applyRelAttribute($link, true);

        if ($openInNewWindow) {
            $link->data->set('attributes/target', '_blank');
        }

        if ($classes !== '') {
            $link->data->append('attributes/class', $classes);
        }
    }

    private function applyRelAttribute(Link $link, bool $isExternal): void
    {
        $options = [
            'nofollow'   => $this->config->get('external_link/nofollow'),
            'noopener'   => $this->config->get('external_link/noopener'),
            'noreferrer' => $this->config->get('external_link/noreferrer'),
        ];

        foreach ($options as $type => $option) {
            switch (true) {
                case $option === self::APPLY_ALL:
                case $isExternal && $option === self::APPLY_EXTERNAL:
                case ! $isExternal && $option === self::APPLY_INTERNAL:
                    $link->data->append('attributes/rel', $type);
            }
        }
    }

    /**
     * @internal This method is only public so we can easily test it. DO NOT USE THIS OUTSIDE OF THIS EXTENSION!
     *
     * @param mixed $compareTo
     */
    public static function hostMatches(string $host, $compareTo): bool
    {
        foreach ((array) $compareTo as $c) {
            if (\strpos($c, '/') === 0) {
                if (\preg_match($c, $host)) {
                    return true;
                }
            } elseif ($c === $host) {
                return true;
            }
        }

        return false;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MTg5MTg2ODY4OTU5MDUwMiA3NzA2NDc0ODk4NjY0NjQyIDcwMjc0OTUzOTkwNDM1OA==