/**
 * DBC / BIOTEN V4.3.0
 * Semantic route and editorial interaction layer.
 */
(() => {
  'use strict';

  const init = () => {
    document.documentElement.dataset.v430Ready = 'true';
    initContactRouter();
    initContactIntentState();
    initArticleOrientation();
    keepCurrentLocalNavigationVisible();
  };

  function initContactRouter() {
    const hero = document.querySelector('body.contact-suite-page .contact-hero');
    if (!hero || hero.querySelector('[data-v430-contact-routes]')) return;

    const routes = document.createElement('aside');
    routes.className = 'v430-contact-routes';
    routes.dataset.v430ContactRoutes = '';
    routes.setAttribute('aria-label', '合作入口');
    routes.innerHTML = [
      {
        number: '01 · DBC',
        title: '业务与联合开发',
        copy: '集团合作、博碳生物应用方向及其他专业业务，从对象、阶段与预期结果开始。',
        action: '进入合作表单 →',
        href: '#contact-form'
      },
      {
        number: '02 · PACKAGING',
        title: '博碳包装项目',
        copy: '食品、美妆、医药医疗与特种包装，先提交结构、内容物、工艺与目标市场。',
        action: '开始项目预审 →',
        href: 'sample.html'
      },
      {
        number: '03 · EVIDENCE',
        title: '资料与授权',
        copy: '公开资料直接浏览；TDS、SDS、报告与受控文件按项目用途进入申请路径。',
        action: '进入资料中心 →',
        href: 'resources.html'
      }
    ].map(route => `
      <a class="v430-contact-route" href="${route.href}">
        <span>${route.number}</span>
        <strong>${route.title}</strong>
        <p>${route.copy}</p>
        <b>${route.action}</b>
      </a>`).join('');
    hero.append(routes);
  }

  function initContactIntentState() {
    const form = document.querySelector('body.contact-suite-page form[data-bioten-request-form]');
    if (!form) return;

    const params = new URLSearchParams(window.location.search);
    const intent = params.get('intent') || params.get('from');
    if (!intent) return;

    const intentLabels = {
      'bioten-platform': '博碳生物材料平台 / 联合应用开发',
      'bioten-agriculture': '博碳生物 · 农业科技',
      'bioten-personal-care': '博碳生物 · 日化与个人护理',
      'bioten-waterborne-coatings': '博碳生物 · 生物基水性涂层',
      'bioten-health-research': '博碳生物 · 联合研究 / NDA 项目',
      'bioten-packaging': '博碳包装',
      'food-beverage': '食品与饮料包装',
      'beauty-care': '美妆与个护包装',
      'medical-outer': '医药与医疗包装',
      'special-performance': '特种包装',
      ecoten: '城市更新与建筑涂层',
      dpu: 'DPU 运动地材',
      casu: 'CASU 电池与先进材料',
      antux: 'ANTUX 涂料与渠道合作',
      'dbc-group': 'DBC 集团合作 / 联合研发'
    };

    const hiddenIntent = form.querySelector('[name="intent"]');
    if (hiddenIntent) hiddenIntent.value = intent;

    const preset = Array.from(form.querySelectorAll('option[data-intent-preset]')).find(option => {
      return String(option.dataset.intentPreset || '').split(/\s+/).includes(intent);
    });
    if (preset) preset.selected = true;

    const notice = document.createElement('p');
    notice.className = 'v430-intent-notice';
    notice.setAttribute('role', 'status');
    notice.textContent = `已按来源预选：${intentLabels[intent] || '合作需求'}。您可在表单中继续调整。`;
    form.insertAdjacentElement('beforebegin', notice);
  }

  function initArticleOrientation() {
    const article = document.querySelector('body.news-article-page .news-original-article');
    const content = article?.querySelector('.news-content-original');
    const body = article?.querySelector('.news-body-original');
    if (!article || !content || !body) return;

    const headings = Array.from(content.querySelectorAll('h2, h3')).filter(heading => {
      return !heading.closest('.news-continue') && heading.textContent.trim().length > 0;
    });

    if (headings.length >= 2) {
      const toc = document.createElement('nav');
      toc.className = 'v430-article-toc';
      toc.setAttribute('aria-label', '文章目录');
      toc.innerHTML = '<strong>ARTICLE INDEX · 文章目录</strong><ol></ol>';
      const list = toc.querySelector('ol');

      headings.forEach((heading, index) => {
        if (!heading.id) heading.id = `article-section-${String(index + 1).padStart(2, '0')}`;
        const item = document.createElement('li');
        const link = document.createElement('a');
        link.href = `#${heading.id}`;
        link.textContent = heading.textContent.trim();
        item.append(link);
        list.append(item);
      });
      body.insertAdjacentElement('beforebegin', toc);
    }

    const progress = document.createElement('div');
    progress.className = 'v430-reading-progress';
    progress.setAttribute('aria-hidden', 'true');
    progress.innerHTML = '<span></span>';
    document.body.prepend(progress);

    let queued = false;
    const updateProgress = () => {
      const top = article.offsetTop;
      const distance = Math.max(article.offsetHeight - window.innerHeight, 1);
      const value = Math.min(1, Math.max(0, (window.scrollY - top) / distance));
      progress.style.setProperty('--v430-reading-progress', `${(value * 100).toFixed(2)}%`);
      queued = false;
    };
    const requestUpdate = () => {
      if (queued) return;
      queued = true;
      window.requestAnimationFrame(updateProgress);
    };
    updateProgress();
    window.addEventListener('scroll', requestUpdate, { passive: true });
    window.addEventListener('resize', requestUpdate, { passive: true });
  }

  function keepCurrentLocalNavigationVisible() {
    const currentLinks = document.querySelectorAll([
      '.v270-context [aria-current="page"]',
      '.dv21-domain-switch [aria-current="page"]',
      '.resources-page-nav .is-active',
      '.bioten-page-nav [aria-current="page"]'
    ].join(','));
    currentLinks.forEach(link => {
      if (typeof link.scrollIntoView !== 'function') return;
      window.requestAnimationFrame(() => {
        link.scrollIntoView({ block: 'nearest', inline: 'center' });
      });
    });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init, { once: true });
  } else {
    init();
  }
})();