from typing import TypeVar
from models.devices import GenericDevice, LightDevice, SwitchDevice


DEVICE_TYPE = TypeVar("DEVICE_TYPE", type(GenericDevice), type(SwitchDevice), type(LightDevice))


def filter_devices(devices: list[GenericDevice], type: DEVICE_TYPE) -> list[DEVICE_TYPE]:
    """Filters out devices that are not of a specific type."""
    return [device for device in devices if isinstance(device, DEVICE_TYPE)]