"""Currency helpers."""

from abacus_common_data.currency import Currency

from ledger.constants.error import ERROR_UNKNOWN_CURRENCY


def currency_exists(currency_code):
    """Check if a currency code exists."""
    try:
        Currency(str(currency_code).upper())
        return True
    except KeyError:
        return False


def validate_currency(currency_code):
    """Validate whether given currency code is valid."""
    if not currency_exists(currency_code):
        raise Exception(ERROR_UNKNOWN_CURRENCY.format(code=currency_code))