/**
 * 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 hydrateArticle(art) {
    if (!art) return;

    if (headline) headline.textContent = art.title || headline.textContent;
    if (deck && art.summary) deck.textContent = art.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 && art.summary && art.summary.length > 120) {
      var paras = art.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 || '');
    }

    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);
  }

  fetch('/api/articles?limit=1', { cache: 'no-store', signal: AbortSignal.timeout(12000) })
    .then(function (r) { return r.ok ? r.json() : null; })
    .then(function (data) {
      hydrateArticle(data && data.articles && data.articles[0]);
    })
    .catch(function () {
      section.setAttribute('data-lead-hydrated', 'static-fallback');
    });

  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) {
      fetch('/api/articles?limit=1', { cache: 'no-store' })
        .then(function (r) { return r.ok ? r.json() : null; })
        .then(function (data) {
          hydrateArticle(data && data.articles && data.articles[0]);
        });
    }
  });
})();