"""Custom validations for use in Marshmallow schemas."""

from marshmallow import validate, ValidationError

from royalty_common.constants import error
from royalty_common.constants.constants import DECIMAL_PATTERN


not_blank = validate.Length(min=1, error=error.ERROR_FIELD_MISSING)


def check_decimal_precision(param):
    """
    Check the input is a float with no more than 2 decimal places of precision.

    :param param: a float
    :return: True if the float has no more than 2 digits after the decimal
    point, raises a ValidationError otherwise.
    """
    if DECIMAL_PATTERN.match(str(param)):
        return True
    else:
        raise ValidationError(error.ERROR_INVALID_DECIMAL)