from typing import Any, dataclass_transform


@dataclass_transform(kw_only_default=True)
class DataclassMeta(type):
    """Metaclass that makes classes behave like kw_only dataclasses."""

    def __new__(
        mcs,
        name: str,
        bases: tuple[type, ...],
        namespace: dict[str, Any],
        **kwargs: Any,
    ) -> Any:
        return super().__new__(mcs, name, bases, namespace)


class EntityDescription(metaclass=DataclassMeta):
    """Base description with annotated fields."""

    key: str
    name: str | None = None


class SensorEntityDescription(EntityDescription):
    """Sensor description inheriting key from parent."""

    device_class: str | None = None
    unit: str | None = None


# These should all be valid -- @dataclass_transform tells the checker
# that annotated fields become __init__ parameters.
sensor = SensorEntityDescription(
    key="temperature",  # pyrefly FP: unexpected-keyword
    device_class="temperature",  # pyrefly FP: unexpected-keyword
    name="Temperature Sensor",  # pyrefly FP: unexpected-keyword
)