/**
 * Final Version: Fetches YouTube description and converts links correctly
 * preventing double-tagging or broken HTML.
 */
function get_yt_description_final_v3($atts) {
    $a = shortcode_atts(array('id' => ''), $atts);
    if (empty($a['id'])) return 'Video ID missing.';

    $v_id = esc_attr($a['id']);
    
    // Use a fresh cache key to overwrite the broken HTML in your database
    $transient_key = 'yt_desc_v3_clean_' . $v_id;
    $description = get_transient($transient_key);

    if (false === $description) {
        $response = wp_remote_get("https://www.youtube.com/watch?v=" . $v_id, array(
            'user-agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36'
        ));

        if (is_wp_error($response)) return 'YouTube connection error.';

        $html = wp_remote_retrieve_body($response);

        if (preg_match('/"shortDescription":"(.+?)"/', $html, $matches)) {
            $description = $matches[1];
            
            // Decode unicode characters
            $description = json_decode('"' . $description . '"');
            
            // Clean up backslashes before storing
            $description = stripslashes($description);
            
            set_transient($transient_key, $description, DAY_IN_SECONDS);
        } else {
            return 'Description currently unavailable.';
        }
    }

    // 1. First: Escape the raw text to be safe from XSS
    $safe_desc = esc_html($description);

    // 2. Second: Convert URLs into clickable links using a more precise regex
    // This regex matches URLs starting with http or https
    $pattern = '~(?<!["\'>])\bhttps?://[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))~';
    $clickable_desc = preg_replace($pattern, '<a href="$0" target="_blank" rel="nofollow">$0</a>', $safe_desc);

    // 3. Output the result
    return '<div class="yt-desc-box" style="white-space: pre-wrap; word-break: break-word; background:#f0f0f0; padding:20px; border-radius:5px; border:1px solid #ddd; height:350px; overflow-y:auto;">' 
           . $clickable_desc . 
           '</div>';
}
add_shortcode('video_description', 'get_yt_description_final_v3');