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# Modified from: https://github.com/facebookresearch/fvcore/blob/master/fvcore/common/registry.py  # noqa: E501


class Registry():
    """

    The registry that provides name -> object mapping, to support third-party

    users' custom modules.



    To create a registry (e.g. a backbone registry):



    .. code-block:: python



        BACKBONE_REGISTRY = Registry('BACKBONE')



    To register an object:



    .. code-block:: python



        @BACKBONE_REGISTRY.register()

        class MyBackbone():

            ...



    Or:



    .. code-block:: python



        BACKBONE_REGISTRY.register(MyBackbone)

    """

    def __init__(self, name):
        """

        Args:

            name (str): the name of this registry

        """
        self._name = name
        self._obj_map = {}

    def _do_register(self, name, obj, suffix=None):
        if isinstance(suffix, str):
            name = name + '_' + suffix

        assert (name not in self._obj_map), (f"An object named '{name}' was already registered "
                                             f"in '{self._name}' registry!")
        self._obj_map[name] = obj

    def register(self, obj=None, suffix=None):
        """

        Register the given object under the the name `obj.__name__`.

        Can be used as either a decorator or not.

        See docstring of this class for usage.

        """
        if obj is None:
            # used as a decorator
            def deco(func_or_class):
                name = func_or_class.__name__
                self._do_register(name, func_or_class, suffix)
                return func_or_class

            return deco

        # used as a function call
        name = obj.__name__
        self._do_register(name, obj, suffix)

    def get(self, name, suffix='basicsr'):
        ret = self._obj_map.get(name)
        if ret is None:
            ret = self._obj_map.get(name + '_' + suffix)
            print(f'Name {name} is not found, use name: {name}_{suffix}!')
        if ret is None:
            raise KeyError(f"No object named '{name}' found in '{self._name}' registry!")
        return ret

    def __contains__(self, name):
        return name in self._obj_map

    def __iter__(self):
        return iter(self._obj_map.items())

    def keys(self):
        return self._obj_map.keys()


DATASET_REGISTRY = Registry('dataset')
ARCH_REGISTRY = Registry('arch')
MODEL_REGISTRY = Registry('model')
LOSS_REGISTRY = Registry('loss')
METRIC_REGISTRY = Registry('metric')