Berrry × JS13K
Games 2026

// Check if the player is already logged in
async function checkLogin() {
  try {
    const res = await fetch('/api/auth/user');
    if (res.ok) {
      const user = await res.json();
      // user = { id, email, username, display_name }
      showWelcome(user.display_name || user.username);
      return user;
    } else {
      showLoginButton(); // Not logged in
      return null;
    }
  } catch (err) {
    // Offline — fall back to localStorage
    showOfflineMode();
    return null;
  }
}

// Send the player to Berrry's login page
function loginPlayer() {
  window.location.href = '/api/auth/login';
}

async function logoutPlayer() {
  await fetch('/api/auth/logout', { method: 'POST' });
  showLoginButton();
}

// Save game progress for the logged-in player
async function saveProgress(level, score) {
  const progress = { level, score,
    savedAt: new Date().toISOString() };

  // Backend (persists across devices)
  await fetch('/api/data/game-progress', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(progress)
  });

  // Cache locally for offline play
  localStorage.setItem('game-progress',
    JSON.stringify(progress));
}

async function loadProgress() {
  try {
    const res = await fetch('/api/data/game-progress');
    if (res.ok) return await res.json();
  } catch (e) {}
  return JSON.parse(
    localStorage.getItem('game-progress') || 'null');
}