add_filter('the_content', function($content) {
    if (get_post_type() !== 'cgp_catalog' || !is_singular('cgp_catalog')) return $content;

    $products = get_post_meta(get_the_ID(), '_catalog_products', true);
    $products = is_array($products) ? $products : [];

    ob_start();
    echo '<h2>Catalog Products</h2>';
    echo '<ul class="cgp-catalog-products" style="list-style:none;">';

    foreach ($products as $pid) {
        $p = wc_get_product($pid);
        if (!$p) continue;

        $post = get_post($pid); // for full description
        $product_link = get_permalink($pid);

        echo '<li style="margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid #ccc;">';

        // Product image
        echo '<div><img src="' . get_the_post_thumbnail_url($pid, 'large') . '" style="width:300px;height:auto;"></div>';

        // Product link
        echo '<div><a href="' . esc_url($product_link) . '" target="_blank" style="color:#0073aa;">View Product</a></div>';

        // Title, price, descriptions
        echo '<h3>' . esc_html($p->get_name()) . '</h3>';
        echo '<p><strong>Price:</strong> ' . wc_price($p->get_price()) . '</p>';

        $short_desc = $p->get_short_description();
        if (!empty($short_desc)) {
            echo '<div style="margin:10px 0;"><strong>Short Description:</strong><br>' . wp_kses_post($short_desc) . '</div>';
        }

        $full_desc = $post->post_content;
        if (!empty($full_desc)) {
            echo '<div style="margin:10px 0;"><strong>Description:</strong><br>' . wp_kses_post(wpautop($full_desc)) . '</div>';
        }

        echo '</li>';
    }

    echo '</ul>';

    return $content . ob_get_clean();
});