"""Currency helpers."""

from abacus_common_data.currency import Currency
from marshmallow import ValidationError

from abacus_worksheet.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_exists(currency_code):
    """Return error if currency does not exist."""
    if currency_exists(currency_code):
        return
    raise ValidationError(ERROR_UNKNOWN_CURRENCY.format(code=currency_code))