"""XML File utilities."""

from xml.etree import ElementTree

CURRENCY_NUMBER_FIELD = 'CcyNbr'
CURRENCY_NAME_FIELD = 'CcyNm'
CURRENCY_CODE_FIELD = 'Ccy'
CURRENCY_COUNTRY_FIELD = 'CtryNm'


def yield_currencies(file_path, xml_path):
    """Yield currency data from XML."""
    tree = ElementTree.parse(file_path)
    root = tree.getroot()
    for child in root.findall(xml_path):
        try:
            currency_number = int(child.findtext(CURRENCY_NUMBER_FIELD))
        except TypeError:
            currency_number = 0
        yield {
            'currency_name': child.findtext(CURRENCY_NAME_FIELD),
            'country_name': child.findtext(CURRENCY_COUNTRY_FIELD),
            'currency_number': currency_number,
            'currency_code': child.findtext(CURRENCY_CODE_FIELD)
        }