<?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:----MjM2MDYzNjQwMDU4NzIzMyA5Mzg4Njk2MzU0MzE4MjQgNjI0MDAyOTE2MjM3NzY0OA==