from decimal import Decimal


_conversion_unit = Decimal(1e18)

def convert_atto_to_one(atto):
    """
    Convert ATTO to ONE

    Parameters
    ----------
    atto: str, int, float, decimal
        Value in ATTO to convert to ONE
        Float input will be truncated, since ATTO is the lowest possible denomination of ONE

    Returns
    -------
    decimal
        Converted value in ONE
    """
    if isinstance(atto, float):
        atto = int(atto)
    return Decimal(atto) / _conversion_unit


def convert_one_to_atto(one):
    """
    Convert ONE to ATTO

    Parameters
    ----------
    one: str, int, float, decimal
        Value in ONE to convert to ATTO

    Returns
    -------
    decimal
        Converted value in ATTO
    """
    if isinstance(one, float):
        one = str(one)
    return Decimal(one) * _conversion_unit