/* ----------------------------------------------------------------
 * CATEGORY ARCHIVE: Structured Data
 * ---------------------------------------------------------------*/
public function print_structured_data_category(){
  if (!is_category()) return;

  $term = get_queried_object();
  if (!$term || is_wp_error($term)) return;

  $opts    = $this->get_opts();
  $schemas = [];

  // 1) CollectionPage cho trang category
  $schemas[] = $this->build_collectionpage_schema($term, $opts);

  // 2) BreadcrumbList cho category
  $catBreadcrumb = $this->build_category_breadcrumb_schema($term);
  if (!empty($catBreadcrumb)) $schemas[] = $catBreadcrumb;

  // 3) Organization
  $org = $this->build_organization_schema($opts);
  if (!empty($org)) $schemas[] = $org;

  // 4) LocalBusiness (nếu bật)
  if (!empty($opts['lb_enabled'])) {
    $lb = $this->build_localbusiness_schema($opts);
    if (!empty($lb)) $schemas[] = $lb;
  }

  // 5) ItemList các bài trên trang (theo trang hiện tại)
  $itemList = $this->build_category_itemlist_schema($term);
  if (!empty($itemList)) $schemas[] = $itemList;

  // In ra
  foreach($schemas as $s){
    if (empty($s)) continue;
    $json = wp_json_encode($s, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
    if ($json) {
      echo '<script type="application/ld+json">'.$json.'</script>'."\n";
    }
  }
}

/**
 * Schema cho CollectionPage (trang liệt kê bài viết theo chuyên mục)
 */
private function build_collectionpage_schema($term, $opts){
  $name = single_term_title('', false);
  $desc = term_description($term, 'category'); // HTML
  $url  = get_term_link($term);

  // Lấy ngày chỉnh sửa gần nhất trong category (nếu có)
  $lastMod = '';
  $recent  = get_posts([
    'post_type'      => 'post',
    'posts_per_page' => 1,
    'orderby'        => 'modified',
    'order'          => 'DESC',
    'tax_query'      => [[
      'taxonomy' => 'category',
      'field'    => 'term_id',
      'terms'    => $term->term_id,
    ]],
    'fields'         => 'ids',
    'no_found_rows'  => true,
  ]);
  if (!empty($recent)) {
    $lastMod = get_the_modified_date('c', $recent[0]);
  }

  $siteName = !empty($opts['org_name']) ? $opts['org_name'] : get_bloginfo('name');
  $siteUrl  = !empty($opts['org_url'])  ? $opts['org_url']  : site_url('/');

  $data = [
    "@context"      => "https://schema.org",
    "@type"         => ["CollectionPage", "WebPage"],
    "name"          => wp_strip_all_tags($name),
    "description"   => wp_strip_all_tags($desc),
    "url"           => $url,
    "isPartOf"      => [
      "@type" => "WebSite",
      "name"  => $siteName,
      "url"   => $siteUrl
    ],
    "inLanguage"    => get_bloginfo('language') ?: 'vi-VN',
    "mainEntity"    => [
      "@type" => "ItemList",
      "itemListElement" => [] // sẽ có thêm ở ItemList riêng bên dưới (để các crawler linh hoạt)
    ],
  ];
  if ($lastMod) $data["dateModified"] = $lastMod;

  return $data;
}

/**
 * BreadcrumbList cho trang category
 */
private function build_category_breadcrumb_schema($term){
  $items = [
    [
      "@type"    => "ListItem",
      "position" => 1,
      "name"     => "Trang chủ",
      "item"     => home_url('/')
    ],
    [
      "@type"    => "ListItem",
      "position" => 2,
      "name"     => wp_strip_all_tags($term->name),
      "item"     => get_term_link($term)
    ],
  ];

  return [
    "@context"        => "https://schema.org",
    "@type"           => "BreadcrumbList",
    "itemListElement" => $items
  ];
}

/**
 * ItemList các bài viết xuất hiện trên trang category (trang hiện tại)
 * - Giới hạn tối đa 20 để JSON gọn nhẹ
 */
private function build_category_itemlist_schema($term){
  global $wp_query;

  // Lấy danh sách post theo truy vấn trang hiện tại (đã có phân trang)
  $posts = !empty($wp_query->posts) ? $wp_query->posts : [];
  if (empty($posts)) return [];

  $elements = [];
  $i = 1;
  foreach($posts as $p){
    if ($i > 20) break; // giới hạn an toàn
    $elements[] = [
      "@type"    => "ListItem",
      "position" => $i,
      "url"      => get_permalink($p),
      "name"     => wp_strip_all_tags(get_the_title($p)),
    ];
    $i++;
  }

  return [
    "@context"        => "https://schema.org",
    "@type"           => "ItemList",
    "name"            => wp_strip_all_tags($term->name),
    "itemListElement" => $elements
  ];
}
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