const loginContainer = document.getElementById('login-container');
const mainSection = document.getElementById('hidden-until-login');
const userPic = document.getElementById('user-pic');
const userName = document.getElementById('user-name');
const logoutBtn = document.getElementById('logout');
const messageInput = document.getElementById('message');
const sendBtn = document.getElementById('send');
const statusEl = document.getElementById('status');

const token = location.pathname.split('/').filter(Boolean).pop();
const socket = io({ query: { role: 'sender', token } });

function showLoggedIn(user) {
  loginContainer.style.display = 'none';
  mainSection.style.display = 'block';
  userPic.src = user.picture || '';
  userName.textContent = user.name || user.email;
}

function showLoggedOut() {
  loginContainer.style.display = 'block';
  mainSection.style.display = 'none';
}

async function handleCredentialResponse(response) {
  const res = await fetch('/auth/google', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ credential: response.credential }),
  });

  if (res.ok) {
    const { user } = await res.json();
    showLoggedIn(user);
    // The socket connected before login with no session cookie; reconnect so
    // its handshake picks up the freshly-issued, now-authenticated cookie.
    socket.disconnect();
    socket.connect();
  } else {
    statusEl.textContent = 'Не удалось войти, попробуйте ещё раз';
  }
}

async function init() {
  const configRes = await fetch('/config');
  const { googleClientId } = await configRes.json();

  google.accounts.id.initialize({
    client_id: googleClientId,
    callback: handleCredentialResponse,
  });
  google.accounts.id.renderButton(loginContainer, { theme: 'outline', size: 'large' });

  const meRes = await fetch('/me');
  const { user } = await meRes.json();
  if (user) {
    showLoggedIn(user);
  } else {
    showLoggedOut();
  }
}

sendBtn.addEventListener('click', () => {
  const text = messageInput.value.trim();
  if (!text) return;
  socket.emit('send_message', { token, text });
  messageInput.value = '';
  statusEl.textContent = 'Отправлено';
  setTimeout(() => { statusEl.textContent = ''; }, 1500);
});

messageInput.addEventListener('keydown', (e) => {
  if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
    sendBtn.click();
  }
});

socket.on('send_error', (msg) => {
  statusEl.textContent = 'Ошибка: ' + msg;
});

logoutBtn.addEventListener('click', async () => {
  await fetch('/auth/logout', { method: 'POST' });
  showLoggedOut();
});

init();