import copy


class Entity:
    def __init__(self, name, tags=None):
        self.name = name
        self.tags = list(tags) if tags is not None else []

    def clone(self):
        """Return an independent deep copy of this entity."""
        return copy.deepcopy(self)


class PrototypeRegistry:
    def __init__(self):
        self._prototypes = {}

    def register(self, name, prototype):
        self._prototypes[name] = prototype

    def create(self, name):
        if name not in self._prototypes:
            raise KeyError(name)
        return self._prototypes[name].clone()

    def spawn(self, name, /, **overrides):
        """Clone the prototype, then apply attribute overrides to the clone."""
        # TODO: create a clone, setattr each override on it, return the clone
        pass