// === Add ACF taxonomy to blog module meta ===
// src: https://divibooster.com/add-acf-taxonomy-fields-to-the-divi-blog-module-post-meta/

add_filter('et_pb_blog_shortcode_output', 'db_blog_acf_tax_add_article_filters', 10, 3);

function db_blog_acf_tax_add_article_filters($content, $render_slug, $module) {
    if (is_string($content) && isset($module->props) && is_array($module->props)) {
        return preg_replace_callback('/<article id="post-(\d+)"(.*?)<\/article>/s', function ($matches) use ($module) {
            return db_blog_acf_tax_process_article($matches, $module->props);
        }, $content);
    }
    return $content;
}

function db_blog_acf_tax_process_article($matches, $props) {
    $article_html = $matches[0];
    $post_id = $matches[1];

    // Extract current post meta items
    $meta_items = db_blog_acf_tax_extract_meta_items($article_html);

    // Add ACF taxonomy items if the class 'blog-with-acf-taxonomy' is present
    if (isset($props['module_class']) && strpos($props['module_class'], 'blog-with-acf-taxonomy') !== false) {
        $meta_items = db_blog_acf_tax_add_acf_taxonomy($meta_items, $post_id);
    }

    // Add post-meta paragraph if it's missing
    if (!empty($meta_items) && strpos($article_html, '<p class="post-meta">') === false) {
        $article_html = str_replace('<div class="post-content">', '<p class="post-meta"></p><div class="post-content">', $article_html);
    }

    // Replace old post-meta with new
    return preg_replace('/<p class="post-meta">.*?<\/p>/s', '<p class="post-meta">' . implode(' | ', $meta_items) . '</p>', $article_html);
}

function db_blog_acf_tax_extract_meta_items($html) {
    if (preg_match('/<p class="post-meta">(.*?)<\/p>/s', $html, $matches)) {
        return explode(' | ', $matches[1]);
    }
    return array();
}

function db_blog_acf_tax_add_acf_taxonomy($meta_items, $post_id) {
    $taxonomy_key = 'genre'; // <--- CHANGE THIS TO YOUR ACF TAXONOMY KEY

    $terms = get_the_terms($post_id, $taxonomy_key);

    if (empty($terms)) return $meta_items;

    $acf_taxonomy = array_map(function ($term) {
        $term_link = get_term_link($term, $term->taxonomy);
        return is_wp_error($term_link) ? '' : '<a href="' . esc_url($term_link) . '">' . esc_html($term->name) . '</a>';
    }, $terms);

    $meta_items[] = implode(', ', $acf_taxonomy);
    return $meta_items;
}

// === END: Add ACF taxonomy to blog module meta ===