/**
 * Hydrate #lead section from live Pulse /api/articles?limit=1
 * Syncs read-aloud voice when article edition changes.
 */
(function () {
  var section = document.getElementById('lead');
  if (!section) return;

  var headline = section.querySelector('.lead-headline');
  var deck = section.querySelector('.lead-deck');
  var byline = section.querySelector('.lead-byline');
  var flag = section.querySelector('.lead-flag');
  var body = section.querySelector('.article-text');
  var readBtn = section.querySelector('button[onclick*="vbSpeak"]');

  function esc(s) {
    return String(s || '')
      .replace(/&/g, '&')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;');
  }

  function formatDate(iso) {
    if (!iso) return '';
    try {
      return new Date(iso).toLocaleDateString('en-US', {
        year: 'numeric',
        month: 'long',
        day: 'numeric',
      });
    } catch (_) {
      return '';
    }
  }

  function syncLeadVoice(art) {
    if (!art || !window.GMIIEVoiceSync) return;
    var scripts = window.GMIIEVoiceSync.getScripts();
    if (scripts.lead && scripts.lead.article_id === art.id) return;
    window.GMIIEVoiceSync.refresh();
  }

  function isXml(str) {
    var s = String(str || '').trim().toLowerCase();
    return s.indexOf('<?xml') !== -1 || s.indexOf('<rss') !== -1 || s.indexOf('<channel') !== -1 || s.indexOf('<description') !== -1;
  }

  function parseXmlRss(xmlStr) {
    var title = "Federal Reserve Press Releases";
    var summary = "All recent press releases from the Federal Reserve Board of Governors.";
    var link = "https://www.federalreserve.gov/feeds/feeds.htm";

    try {
      var parser = new DOMParser();
      var xmlDoc = parser.parseFromString(xmlStr, "text/xml");
      
      var parserError = xmlDoc.querySelector("parsererror");
      if (parserError) {
        throw new Error("XML parse error");
      }
      
      var itemEl = xmlDoc.querySelector("item");
      var searchDoc = itemEl || xmlDoc;
      
      var titleEl = searchDoc.querySelector("title");
      if (titleEl) title = titleEl.textContent || title;
      
      var linkEl = searchDoc.querySelector("link");
      if (linkEl) link = linkEl.textContent || link;
      
      var descEl = searchDoc.querySelector("description");
      if (descEl) summary = descEl.textContent || summary;
    } catch (e) {
      var itemMatch = xmlStr.match(/<item>([\s\S]*?)<\/item>/i);
      var searchIn = itemMatch ? itemMatch[1] : xmlStr;

      var titleMatch = searchIn.match(/<title>(?:<!\[CDATA\[)?([\s\S]*?)(?:\]\]>)?<\/title>/i);
      if (titleMatch) title = titleMatch[1].trim();

      var linkMatch = searchIn.match(/<link>(?:<!\[CDATA\[)?([\s\S]*?)(?:\]\]>)?<\/link>/i);
      if (linkMatch) link = linkMatch[1].trim();

      var descMatch = searchIn.match(/<description>(?:<!\[CDATA\[)?([\s\S]*?)(?:\]\]>)?<\/description>/i);
      if (descMatch) summary = descMatch[1].trim();
    }

    if (summary) {
      summary = summary.replace(/<[^>]*>/g, '').trim();
      summary = summary
        .replace(/&lt;/g, '<')
        .replace(/&gt;/g, '>')
        .replace(/&amp;/g, '&')
        .replace(/&quot;/g, '"')
        .replace(/&apos;/g, "'");

      if (summary.endsWith('f')) {
        summary = summary.slice(0, -1) + 'from the Federal Reserve Board.';
      }
    }

    return { title: title, summary: summary, link: link };
  }

  function hydrateArticle(art) {
    if (!art) return;

    var title = art.title;
    var summary = art.summary || '';
    var sourceLink = art.source || 'https://www.federalreserve.gov/feeds/feeds.htm';

    if (isXml(summary)) {
      var parsed = parseXmlRss(summary);
      title = parsed.title;
      summary = parsed.summary + '\n\nTakeaway: Monetary policy announcements and press releases directly impact R1 (Structural) and R2 (Language) rings.';
      sourceLink = parsed.link;
    }

    if (headline) headline.textContent = title || headline.textContent;
    if (deck && summary) deck.textContent = summary.slice(0, 420);
    if (flag) {
      var desk = (art.desk || 'markets').replace(/-/g, ' ');
      flag.textContent = 'Lead Analysis — ' + desk.replace(/\b\w/g, function (c) { return c.toUpperCase(); });
    }
    if (byline) {
      var author = (art.footer && art.footer.author_name) || art.author_id || 'GMIIE Intelligence Desk';
      var date = formatDate(art.published_at);
      var signal = art.signal != null ? ' — Signal ' + art.signal + '/100' : '';
      var badge = art.footer && art.footer.badge ? ' — ' + art.footer.badge : '';
      byline.textContent = author + (date ? ' — ' + date : '') + signal + badge;
    }
    if (body && summary && summary.length > 120) {
      var paras = summary.split(/\n\n+/).filter(Boolean);
      if (paras.length) {
        body.innerHTML = paras
          .slice(0, 4)
          .map(function (p) { return '<p>' + esc(p) + '</p>'; })
          .join('');
      }
    }
    if (readBtn && art.title) {
      readBtn.setAttribute('aria-label', 'Read aloud: ' + art.title);
      readBtn.setAttribute('data-voice-article-id', art.id || '');
    }

    var mintHost = section.querySelector('.lead-mint-host');
    if (!mintHost) {
      mintHost = document.createElement('div');
      mintHost.className = 'lead-mint-host';
      if (readBtn && readBtn.parentNode) {
        readBtn.parentNode.insertBefore(mintHost, readBtn.nextSibling);
      } else {
        section.appendChild(mintHost);
      }
    }
    mintHost.innerHTML = '';
    if (window.GMIIELpsMint && art.id) {
      window.GMIIELpsMint.renderButton(mintHost, {
        briefId: art.id,
        title: art.title,
        lps1Id: art.lps1_registration_id,
      });
    }

    section.setAttribute('data-lead-hydrated', '1');
    section.setAttribute('data-lead-article-id', art.id || '');
    if (art.sha256) section.setAttribute('data-lead-sha256', art.sha256);
    syncLeadVoice(art);
  }

  function fetchAndHydrateLead(options) {
    var url = '/api/articles?limit=10';
    var fetchOpts = { cache: 'no-store' };
    if (options && options.signal) {
      fetchOpts.signal = options.signal;
    }
    return fetch(url, fetchOpts)
      .then(function (r) { return r.ok ? r.json() : null; })
      .then(function (data) {
        var articles = (data && data.articles) || [];
        var leadArt = null;
        for (var i = 0; i < articles.length; i++) {
          var a = articles[i];
          if (
            a &&
            (a.lane === 'lead' || a.id === 'catchup-cme-perps-suit-2026') &&
            a.summary &&
            a.summary.length > 500 &&
            !a.id.startsWith('scrape-')
          ) {
            leadArt = a;
            break;
          }
        }
        if (leadArt) {
          hydrateArticle(leadArt);
        } else {
          section.setAttribute('data-lead-hydrated', 'static-fallback');
        }
      })
      .catch(function () {
        section.setAttribute('data-lead-hydrated', 'static-fallback');
      });
  }

  fetchAndHydrateLead({ signal: AbortSignal.timeout(12000) });

  window.addEventListener('gmiie-voice-updated', function () {
    var artId = section.getAttribute('data-lead-article-id');
    var scripts = window.GMIIEVoiceSync && window.GMIIEVoiceSync.getScripts();
    if (scripts && scripts.lead && scripts.lead.article_id && artId && scripts.lead.article_id !== artId) {
      fetchAndHydrateLead();
    }
  });
})();