(function () {
  'use strict';

  if (window.__DBC_SITE_V450__) return;
  window.__DBC_SITE_V450__ = true;

  const categoryKeys = new Set([
    'all',
    'technology-product',
    'application-engineering',
    'industry-collaboration',
    'enterprise-brand'
  ]);

  function normalizeCategory(value) {
    return categoryKeys.has(value) ? value : 'all';
  }

  function setPressed(controls, key, attribute) {
    controls.forEach(control => {
      const active = control.getAttribute(attribute) === key;
      control.classList.toggle('is-active', active);
      control.setAttribute('aria-pressed', String(active));
    });
  }

  function updateQuery(name, value, defaultValue) {
    if (!window.history || !window.history.replaceState) return;
    const url = new URL(window.location.href);
    if (value === defaultValue) url.searchParams.delete(name);
    else url.searchParams.set(name, value);
    window.history.replaceState({}, '', `${url.pathname}${url.search}${url.hash}`);
  }

  function setupNewsFilters() {
    const controls = [...document.querySelectorAll('[data-news-filter]')];
    const cards = [...document.querySelectorAll('[data-news-category]')];
    if (!controls.length || !cards.length) return;

    const result = document.querySelector('[data-news-result]');
    const params = new URLSearchParams(window.location.search);

    function applyFilter(requested, writeUrl) {
      const category = normalizeCategory(requested);
      let visible = 0;

      cards.forEach(card => {
        const match = category === 'all' || card.dataset.newsCategory === category;
        card.hidden = !match;
        card.setAttribute('aria-hidden', String(!match));
        if (match) visible += 1;
      });

      setPressed(controls, category, 'data-news-filter');
      if (result) result.textContent = `共 ${visible} 条公开信息`;
      if (writeUrl) updateQuery('category', category, 'all');
    }

    controls.forEach(control => {
      control.addEventListener('click', event => {
        if (control.tagName === 'A') event.preventDefault();
        applyFilter(control.dataset.newsFilter || 'all', true);
      });
    });

    applyFilter(params.get('category') || 'all', false);
  }

  function setupArchiveFilters() {
    const controls = [...document.querySelectorAll('[data-archive-year]')];
    const cards = [...document.querySelectorAll('[data-archive-year-card]')];
    if (!controls.length || !cards.length) return;

    const validYears = new Set(['all', ...cards.map(card => card.dataset.archiveYearCard)]);
    const result = document.querySelector('[data-archive-result]');
    const params = new URLSearchParams(window.location.search);

    function applyYear(requested, writeUrl) {
      const year = validYears.has(requested) ? requested : 'all';
      let visible = 0;

      cards.forEach(card => {
        const match = year === 'all' || card.dataset.archiveYearCard === year;
        card.hidden = !match;
        card.setAttribute('aria-hidden', String(!match));
        if (match) visible += 1;
      });

      setPressed(controls, year, 'data-archive-year');
      if (result) result.textContent = `共 ${visible} 条历史记录`;
      if (writeUrl) updateQuery('year', year, 'all');
    }

    controls.forEach(control => {
      control.addEventListener('click', event => {
        if (control.tagName === 'A') event.preventDefault();
        applyYear(control.dataset.archiveYear || 'all', true);
      });
    });

    applyYear(params.get('year') || 'all', false);
  }

  function markExternalPdfLinks() {
    document.querySelectorAll('a[href$=".pdf"]').forEach(link => {
      if (!link.hasAttribute('rel') && link.target === '_blank') {
        link.rel = 'noopener';
      }
    });
  }

  function init() {
    setupNewsFilters();
    setupArchiveFilters();
    markExternalPdfLinks();
  }

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