// ── API Calls ──

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

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

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

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

async function apiListArchives(sessionId) {
  const resp = await fetch(`/api/archives?sessionId=${sessionId}`);
  return resp.json();
}

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

// ── Session API ──

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

async function apiCreateSession() {
  const resp = await fetch('/api/sessions', { method: 'POST' });
  return resp.json();
}

async function apiUpdateSession(sessionId, data) {
  const resp = await fetch(`/api/sessions/${sessionId}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data)
  });
  return resp.json();
}