// 认证与初始化
async function init() {
  const token = Store.getToken();
  if (token) {
    try {
      const res = await fetch('/api/user', { headers: { 'Authorization': 'Bearer ' + token } });
      if (res.ok) {
        document.getElementById('login-page').classList.add('hidden');
        document.getElementById('main-page').classList.remove('hidden');
        initWebSocket();
        loadRooms();
        updateSummaryPreview();
        initSwipeGestures();
        return;
      }
    } catch(e) {}
    Store.clearAuth();
  }
  document.getElementById('login-page').classList.remove('hidden');
  document.getElementById('main-page').classList.add('hidden');
}

async function login() {
  const u = document.getElementById('login-user').value;
  const p = document.getElementById('login-pass').value;
  const res = await fetch('/api/login', {
    method: 'POST', headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username: u, password: p })
  });
  if (res.ok) {
    const data = await res.json();
    Store.saveAuth(data);
    document.getElementById('login-page').classList.add('hidden');
    document.getElementById('main-page').classList.remove('hidden');
    initWebSocket();
    loadRooms();
    updateSummaryPreview();
    initSwipeGestures();
  } else {
    const err = await res.json();
    document.getElementById('login-error').textContent = err.error || '\u767b\u5f55\u5931\u8d25';
  }
}