<?php

if (!function_exists('add_target_blank_to_external_links')) {
    /**
     * Takes in an HTML string and makes sure that any external URLs are marked as target blank
     */
    function add_target_blank_to_external_links(string|\Illuminate\Support\Stringable $escapedHtml)
    {
        $html = stripslashes($escapedHtml);

        $doc = new \DOMDocument();
        $doc->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

        $xpath = new \DOMXPath($doc);

        /** @var \DOMElement */
        $links = $xpath->query('//a[@href]');

        foreach ($links as $link) {
            $href = $link->attributes->getNamedItem('href')->value;
            if (\Illuminate\Support\Facades\URL::isValidUrl($href) && is_external_url($href)) {
                $link->setAttribute('target', '_blank');
                $link->setAttribute('rel', 'noopener');
            }
        }

        return str($doc->saveHTML())->toHtmlString();
    }
}