class Registry(object):
    def __init__(self):
        self._registry = {}
        self._field_registry = {}

    def register(self, cls):
        from .types import DjangoObjectType

        assert issubclass(
            cls, DjangoObjectType
        ), 'Only DjangoObjectTypes can be registered, received "{}"'.format(
            cls.__name__
        )
        assert cls._meta.registry == self, "Registry for a Model have to match."
        # assert self.get_type_for_model(cls._meta.model) == cls, (
        #     'Multiple DjangoObjectTypes registered for "{}"'.format(cls._meta.model)
        # )
        if not getattr(cls._meta, "skip_registry", False):
            self._registry[cls._meta.model] = cls

    def get_type_for_model(self, model):
        return self._registry.get(model)

    def register_converted_field(self, field, converted):
        self._field_registry[field] = converted

    def get_converted_field(self, field):
        return self._field_registry.get(field)


registry = None


def get_global_registry():
    global registry
    if not registry:
        registry = Registry()
    return registry


def reset_global_registry():
    global registry
    registry = None