// Mock Google OAuth configuration
const GOOGLE_CLIENT_ID = '1016208801816-qtvcvki2jobmcin1g4e7u4sotr0p8g3u.apps.googleusercontent.com';
const GOOGLE_REDIRECT_URI = typeof window !== 'undefined' 
  ? `${window.location.origin}/api/auth/google/callback`
  : '';

/**
 * Initiates Google OAuth authentication flow
 */
export const signInWithGoogle = () => {
  const params = new URLSearchParams({
    client_id: GOOGLE_CLIENT_ID,
    redirect_uri: GOOGLE_REDIRECT_URI,
    response_type: 'code',
    scope: 'email profile',
    prompt: 'select_account',
  });

  // In a real implementation, you would have proper error handling and secure state management
  window.location.href = `https://accounts.google.com/o/oauth2/v2/auth?${params.toString()}`;
};

/**
 * Gets the current user from session storage (mock implementation)
 */
export const getCurrentUser = () => {
  if (typeof window === 'undefined') return null;
  
  const userJson = sessionStorage.getItem('currentUser');
  if (!userJson) return null;
  
  try {
    return JSON.parse(userJson);
  } catch (error) {
    console.error('Failed to parse user data from session', error);
    return null;
  }
};

/**
 * Handles user login (mock implementation)
 */
export const loginUser = async (email: string, password: string) => {
  // This is a mock implementation
  // In a real app, you would make an API call to your backend
  return new Promise((resolve) => {
    setTimeout(() => {
      // Mock user data
      const user = {
        id: '123',
        name: 'Test User',
        email,
        avatar: 'https://i.pravatar.cc/150?u=' + email,
      };
      
      // Store in session storage (just for demo purposes)
      sessionStorage.setItem('currentUser', JSON.stringify(user));
      resolve(user);
    }, 1000);
  });
};

/**
 * Handles user logout
 */
export const logoutUser = () => {
  if (typeof window === 'undefined') return;
  sessionStorage.removeItem('currentUser');
  window.location.href = '/login';
};