"""General logic."""

from ows_accounting.constants import header


def get_user_type_from_accounting_type(account_type):
    """Get user type from account type, picked up from GRASS.

    Args:
        account_type (str): vendor or subaccount.

    Returns:
        Response: response object with a list of integer values of
        accounting period ids.

    Raises:
        ValueError: if not proper account type.
    """
    try:
        return header.USER_TYPES[account_type]
    except KeyError:
        raise ValueError(
            "The '{account_type}' account_type is not valid.".format(
                account_type=account_type))