// ── API Calls ──

async function apiChat(model, messages, systemPrompt) {
  return fetch('/api/chat', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ model, messages, systemPrompt })
  });
}

async function apiHistory(sessionId = 'null') {
  const resp = await fetch(`/api/history?sessionId=${sessionId}`);
  return resp.json();
}

async function apiHistoryPoll(afterId) {
  const resp = await fetch(`/api/history/poll?afterId=${afterId}`);
  return resp.json();
}

async function apiArchive() {
  const resp = await fetch('/api/archive', { method: 'POST' });
  if (resp.status === 204) return null;
  return resp.json();
}

async function apiListArchives() {
  const resp = await fetch('/api/archives');
  return resp.json();
}

async function apiGetArchive(archiveId) {
  const resp = await fetch(`/api/archive/${archiveId}`);
  return resp.json();
}