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

from collections.abc import Generator, Iterable
import contextlib
from enum import Enum
import socket
from typing import Any

from pyunifiprotect.data import (
    Bootstrap,
    Light,
    LightModeEnableType,
    LightModeType,
    ProtectAdoptableDeviceModel,
)

from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant, callback

from .const import DOMAIN, ModelType


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:]


async def _async_resolve(hass: HomeAssistant, host: str) -> str | None:
    """Resolve a hostname to an ip."""
    with contextlib.suppress(OSError):
        return next(
            iter(
                raw[0]
                for family, _, _, _, raw in await hass.loop.getaddrinfo(
                    host, None, type=socket.SOCK_STREAM, proto=socket.IPPROTO_TCP
                )
                if family == socket.AF_INET
            ),
            None,
        )
    return None


@callback
def async_get_devices_by_type(
    bootstrap: Bootstrap, device_type: ModelType
) -> dict[str, ProtectAdoptableDeviceModel]:
    """Get devices by type."""

    devices: dict[str, ProtectAdoptableDeviceModel] = getattr(
        bootstrap, f"{device_type.value}s"
    )
    return devices


@callback
def async_get_devices(
    bootstrap: Bootstrap, model_type: Iterable[ModelType]
) -> Generator[ProtectAdoptableDeviceModel, None, None]:
    """Return all device by type."""
    return (
        device
        for device_type in model_type
        for device in async_get_devices_by_type(bootstrap, device_type).values()
    )


@callback
def async_get_light_motion_current(obj: Light) -> str:
    """Get light motion mode for Flood Light."""

    if (
        obj.light_mode_settings.mode == LightModeType.MOTION
        and obj.light_mode_settings.enable_at == LightModeEnableType.DARK
    ):
        return f"{LightModeType.MOTION.value}Dark"
    return obj.light_mode_settings.mode.value


@callback
def async_dispatch_id(entry: ConfigEntry, dispatch: str) -> str:
    """Generate entry specific dispatch ID."""

    return f"{DOMAIN}.{entry.entry_id}.{dispatch}"