"""MAC Address."""

# standard
import re

# local
from .utils import validator


@validator
def mac_address(value: str, /):
    """Return whether or not given value is a valid MAC address.

    This validator is based on [WTForms MacAddress validator][1].

    [1]: https://github.com/wtforms/wtforms/blob/master/src/wtforms/validators.py#L482

    Examples:
        >>> mac_address('01:23:45:67:ab:CD')
        True
        >>> mac_address('00:00:00:00:00')
        ValidationError(func=mac_address, args={'value': '00:00:00:00:00'})

    Args:
        value:
            MAC address string to validate.

    Returns:
        (Literal[True]): If `value` is a valid MAC address.
        (ValidationError): If `value` is an invalid MAC address.
    """
    # Check for mixed separators: MAC addresses cannot use both ':' and '-' simultaneously
    if ":" in value and "-" in value:
        return False

    return re.match(r"^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$", value) if value else False