"""UniFi Protect Integration utils."""
from __future__ import annotations

from enum import Enum
from typing import Any

from homeassistant.core import callback


def get_nested_attr(obj: Any, attr: str) -> Any:
    """Fetch a nested attribute."""
    attrs = attr.split(".")

    value = obj
    for key in attrs:
        if not hasattr(value, key):
            return None
        value = getattr(value, key)

    if isinstance(value, Enum):
        value = value.value

    return value


@callback
def _async_unifi_mac_from_hass(mac: str) -> str:
    # MAC addresses in UFP are always caps
    return mac.replace(":", "").upper()


@callback
def _async_short_mac(mac: str) -> str:
    """Get the short mac address from the full mac."""
    return _async_unifi_mac_from_hass(mac)[-6:]