// ── Archive Loading ──

let loadedArchiveCount = 0;

function getOrCreateArchiveContainer() {
  let container = chatEl().querySelector('.archive-container');
  if (!container) {
    container = document.createElement('div');
    container.className = 'archive-container';
    chatEl().prepend(container);
  }
  return container;
}

function getOrCreateArchiveDivider() {
  let divider = chatEl().querySelector('.archive-divider');
  if (!divider) {
    divider = document.createElement('div');
    divider.className = 'msg system-info archive-divider';
    divider.textContent = 'Aktuelle Konversation';
    // Nach dem Container, vor den aktiven Messages
    const container = getOrCreateArchiveContainer();
    container.after(divider);
  }
  return divider;
}

async function loadLatestArchive() {
  try {
    const archives = await apiListArchives(getCurrentSessionId());
    if (archives.length <= loadedArchiveCount) return;

    const latest = archives[loadedArchiveCount];
    loadedArchiveCount++;

    removeArchiveLoadButton();

    const data = await apiGetArchive(latest.archiveId);
    const container = getOrCreateArchiveContainer();
    getOrCreateArchiveDivider();

    // Archiv-Block zusammenbauen
    const fragment = document.createDocumentFragment();

    const sep = document.createElement('div');
    sep.className = 'msg system-info';
    sep.innerHTML = `<i class="fa fa-archive"></i> Archiv vom ${new Date(latest.createdAt).toLocaleString('de-AT')} (${latest.chainCount} Chains, ${latest.messageCount} Messages)`;
    fragment.appendChild(sep);

    const archiveImageIds = [];
    for (const entry of data) {
      _renderMessagesIntoFragment(fragment, _mergeConsecutiveAssistantTexts(entry.messages), archiveImageIds, { archived: true });
      if (entry.chain && isChainMetaVisible(entry.chain)) {
        fragment.appendChild(_createChainMetaDiv(entry.chain, 'archived'));
      }
    }

    // Älteres Archiv vor dem bisherigen Inhalt einfügen
    container.prepend(fragment);

    // Bild-Attachments automatisch laden
    for (const mid of archiveImageIds) _autoLoadImageAttachments(mid);

    // Button ganz oben, falls es noch ältere Archive gibt
    if (archives.length > loadedArchiveCount) {
      showArchiveLoadButton();
    }

  } catch (e) {
    console.error('Archiv laden fehlgeschlagen:', e);
  }
}