(function () {
  'use strict';

  if (window.__DBC_SITE_V500__) return;
  window.__DBC_SITE_V500__ = true;

  const file = decodeURIComponent(window.location.pathname.split('/').pop() || 'index.html');
  document.documentElement.dataset.dbcRelease = 'v5.0.0';
  document.body.classList.add('v500-site');
  document.body.dataset.v500System = 'desktop-cn-architecture';

  const exact = {
    'about.html': [['世界杯竞猜官网', 'index.html'], ['关于世界杯竞猜官网', '']],
    'about-brands.html': [['世界杯竞猜官网', 'index.html'], ['品牌与业务', '']],
    'casu.html': [['世界杯竞猜官网', 'index.html'], ['品牌与业务', 'about-brands.html'], ['CASU 中科联化', '']],
    'antux.html': [['世界杯竞猜官网', 'index.html'], ['品牌与业务', 'about-brands.html'], ['ANTUX 环涂士', '']],
    'dpu.html': [['世界杯竞猜官网', 'index.html'], ['品牌与业务', 'about-brands.html'], ['DPU丨BASF&DBC', '']],
    'ecoten.html': [['世界杯竞猜官网', 'index.html'], ['品牌与业务', 'about-brands.html'], ['ECOTEN 易碳', '']],
    'bioten-platform.html': [['博碳生物', ''], ['PHA 水性功能乳液平台', '']],
    'bioten-agriculture.html': [['博碳生物', 'bioten-platform.html'], ['农业生态', '']],
    'bioten-personal-care.html': [['博碳生物', 'bioten-platform.html'], ['洗护应用', '']],
    'bioten-waterborne-coatings.html': [['博碳生物', 'bioten-platform.html'], ['生物基涂料', '']],
    'bioten.html': [['博碳包装', ''], ['纸基包装阻隔系统工程', '']],
    'bioten-packaging-applications.html': [['博碳包装', 'bioten.html'], ['专业包装领域', '']],
    'packaging-food-beverage.html': [['博碳包装', 'bioten.html'], ['专业包装领域', 'bioten-packaging-applications.html'], ['食品与饮料包装', '']],
    'packaging-beauty-personal-care.html': [['博碳包装', 'bioten.html'], ['专业包装领域', 'bioten-packaging-applications.html'], ['美妆与个护包装', '']],
    'packaging-pharma-medical.html': [['博碳包装', 'bioten.html'], ['专业包装领域', 'bioten-packaging-applications.html'], ['医药与医疗包装', '']],
    'packaging-specialty.html': [['博碳包装', 'bioten.html'], ['专业包装领域', 'bioten-packaging-applications.html'], ['特种包装', '']],
    'bioten-lab.html': [['开发者', ''], ['BIOTEN 全领域联合开发', '']],
    'developer-packaging.html': [['博碳包装', 'bioten.html'], ['包装开发者', '']],
    'developer-agriculture.html': [['开发者', 'bioten-lab.html'], ['农业应用开发', '']],
    'developer-personal-care.html': [['开发者', 'bioten-lab.html'], ['洗护配方开发', '']],
    'developer-waterborne-coatings.html': [['开发者', 'bioten-lab.html'], ['生物基涂料开发', '']],
    'developer-open-innovation.html': [['开发者', 'bioten-lab.html'], ['开放创新与产品共创', '']],
    'news.html': [['新闻动态', ''], ['当前发布', '']],
    'news-archive.html': [['新闻动态', 'news.html'], ['历史档案', '']],
    'resources.html': [['开发者', 'bioten-lab.html'], ['资料与证据', '']],
    'knowledge.html': [['开发者', 'bioten-lab.html'], ['方法与知识', '']],
    'sample.html': [['博碳包装', 'bioten.html'], ['包装开发者', 'developer-packaging.html'], ['项目预审', '']],
    'contact.html': [['世界杯竞猜官网', 'index.html'], ['联系与合作', '']]
  };

  const nextByFile = {
    'about.html': ['查看品牌与业务', 'about-brands.html'],
    'about-brands.html': ['进入博碳生物', 'bioten-platform.html'],
    'bioten-platform.html': ['查看四个应用领域', '#scope'],
    'bioten.html': ['进入专业包装领域', 'bioten-packaging-applications.html'],
    'bioten-packaging-applications.html': ['进入包装开发者', 'developer-packaging.html'],
    'bioten-lab.html': ['选择开发子平台', '#workbenches'],
    'developer-packaging.html': ['开始包装项目预审', 'sample.html'],
    'news.html': ['查看公司动态', 'news-company.html']
  };

  function inferredTrail() {
    if (file.startsWith('news-')) return [['新闻动态', 'news.html'], ['文章与资料', '']];
    if (file.startsWith('bioten-products') || file === 'bioten-product-lines.html') return [['博碳包装', 'bioten.html'], ['产品路线', 'bioten-product-lines.html'], ['技术档案', '']];
    if (file.startsWith('developer-domain-')) return [['博碳包装', 'bioten.html'], ['包装开发者', 'developer-packaging.html'], ['领域工程页', '']];
    if (file.startsWith('developer-')) return [['开发者', 'bioten-lab.html'], ['工程方法与证据', '']];
    if (file.startsWith('knowledge-')) return [['开发者', 'bioten-lab.html'], ['方法与知识', 'knowledge.html'], ['专题', '']];
    if (file.startsWith('resources-') || file === 'portal-login.html') return [['开发者', 'bioten-lab.html'], ['资料与证据', 'resources.html'], ['资料详情', '']];
    if (file.startsWith('contact-')) return [['联系与合作', 'contact.html'], ['专项入口', '']];
    return null;
  }

  const trail = exact[file] || inferredTrail();
  if (!trail || file === 'index.html' || document.querySelector('[data-v500-context]')) return;

  const main = document.querySelector('main');
  if (!main) return;

  const list = trail.map(function (item) {
    const label = item[0];
    const href = item[1];
    return '<li>' + (href ? '<a href="' + href + '">' + label + '</a>' : '<span aria-current="page">' + label + '</span>') + '</li>';
  }).join('');

  const next = nextByFile[file];
  const nextLink = next
    ? '<a class="v500-context__next" href="' + next[1] + '"><span>' + next[0] + '</span><span aria-hidden="true">→</span></a>'
    : '';

  const nav = document.createElement('nav');
  nav.className = 'v500-context';
  nav.dataset.v500Context = '';
  nav.setAttribute('aria-label', '当前页面层级');
  nav.innerHTML = '<div class="v500-context__inner"><ol>' + list + '</ol>' + nextLink + '</div>';
  main.parentNode.insertBefore(nav, main);
})();