import os

def load_config(mode=os.environ.get('MODE')):
    """
    Load application configuration from environment variables.
    The MODE environment variable determines which default CORS origins to use,
    but all secrets are loaded from environment variables.
    """
    from settings import ApplicationConfig

    print(f"Mode is {mode or 'not set (defaulting to DEVELOPMENT)'}")

    # Validate required configuration
    try:
        ApplicationConfig.validate_required()
    except ValueError as e:
        print(f"\033[91mConfiguration Error: {e}\033[0m")
        raise

    # Print appropriate warning based on database
    if ApplicationConfig.POSTGRES_DBNAME00 == 'eamco':
        print("\033[92mTest database confirmed\033[0m")
    else:
        print("\033[91mPRODUCTION DATABASE\033[0m")

    if mode == 'PRODUCTION':
        print("\033[91mPRODUCTION MODE\033[0m")

    return ApplicationConfig