/* domucgiare - SEO ky thuat (v2, 12/10/2026)
   1) Ban http:// va www. tu chuyen ve https://mayinlongbien.vn (cho den khi Cong ty URL cai 301 tren may chu)
   2) The canonical: doi http -> https, bo www; them canonical cho trang chu neu thieu
   4) Trang san pham co gia: them du lieu Product (gia, tinh trang) cho Google
   3) Moi trang dung 1 the H1: trang danh muc thieu H1 thi lay H2 tieu de dau tien; H1 thua trong noi dung doi thanh H2 */
(function () {
  var HOST = 'mayinlongbien.vn', BASE = 'https://' + HOST;
  if (location.hostname === 'www.' + HOST || (location.protocol === 'http:' && location.hostname === HOST)) {
    location.replace(BASE + location.pathname + location.search + location.hash);
    return;
  }
  try {
    var c = document.querySelector('link[rel="canonical"]');
    if (c) {
      var h = c.getAttribute('href') || '';
      var n = h.replace(/^https?:\/\/(www\.)?mayinlongbien\.vn/i, BASE);
      if (n !== h) c.setAttribute('href', n);
    } else if (location.pathname === '/' || location.pathname === '/index.html') {
      c = document.createElement('link');
      c.rel = 'canonical';
      c.href = BASE + '/';
      document.head.appendChild(c);
    }
  } catch (e) {}
  try {
    var all = [].slice.call(document.querySelectorAll('h1')).filter(function (x) { return !x.closest('.modal'); });
    function swap(el, tag) {
      var n = document.createElement(tag);
      for (var i = 0; i < el.attributes.length; i++) n.setAttribute(el.attributes[i].name, el.attributes[i].value);
      while (el.firstChild) n.appendChild(el.firstChild);
      el.parentNode.replaceChild(n, el);
      return n;
    }
    if (!all.length) {
      var h2 = document.querySelector('#content .des h2, #content .box_info_page h2, #content article h2');
      if (h2 && h2.textContent.trim().length > 5) swap(h2, 'h1').classList.add('tvh1');
    } else if (all.length > 1) {
      for (var k = 1; k < all.length; k++) swap(all[k], 'h2');
    }
    if (!document.getElementById('tvh1-css')) {
      var st = document.createElement('style');
      st.id = 'tvh1-css';
      st.textContent = 'h1.tvh1{font-size:22px;line-height:1.3;font-weight:700;color:#14284b;margin:0 0 12px}';
      document.head.appendChild(st);
    }
  } catch (e) {}
  try {
    var pe = document.querySelector('.product-essential');
    var pn = pe && document.querySelector('#content .price .new-price');
    var nm = (document.querySelector('h1:not(.modal-title)') || {}).textContent || '';
    nm = nm.trim();
    var price = pn ? parseInt((pn.textContent || '').replace(/[^\d]/g, ''), 10) : 0;
    if (pe && price > 0 && nm && !/^(sửa|thay|đổ mực|cài|vệ sinh|nâng cấp|khắc phục|dịch vụ|bảo trì|lắp đặt|nạp mực)/i.test(nm) && !document.getElementById('tvprod-ld')) {
      var im = pe.querySelector('img');
      var src = im ? (im.getAttribute('data-src') || im.getAttribute('src') || '') : '';
      if (src && src.charAt(0) === '/') src = BASE + src;
      var bm = nm.match(/\b(Canon|Epson|HP|Brother|Samsung|Ricoh|Xerox|Toshiba|Sharp|Kyocera|Konica Minolta|Panasonic|Dell|Lenovo|Asus|Acer|Fujitsu|Pantum)\b/i);
      var md = document.querySelector('meta[name="description"]');
      var cn = document.querySelector('link[rel="canonical"]');
      var p = {
        '@context': 'https://schema.org', '@type': 'Product', name: nm,
        image: src ? [src] : undefined,
        description: md ? md.getAttribute('content') : undefined,
        brand: bm ? { '@type': 'Brand', name: bm[1] } : undefined,
        offers: {
          '@type': 'Offer', url: cn ? cn.getAttribute('href') : BASE + location.pathname,
          priceCurrency: 'VND', price: price,
          availability: 'https://schema.org/InStock',
          itemCondition: /cũ|bóc máy|đã qua sử dụng|thanh lý/i.test(nm) ? 'https://schema.org/UsedCondition' : 'https://schema.org/NewCondition',
          seller: { '@type': 'Organization', name: 'Máy In Mực In Thần Vũ' }
        }
      };
      var sc = document.createElement('script');
      sc.type = 'application/ld+json'; sc.id = 'tvprod-ld';
      sc.textContent = JSON.stringify(p);
      document.head.appendChild(sc);
    }
  } catch (e) {}
})();