#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Define model."""

from plato2_en_base.models.model_base import Model

MODEL_REGISTRY = {}

__all__ = ["MODEL_REGISTRY", "register_model", "create_model", "add_cmdline_args"]


def register_model(name):
    """
    Register a new model class.
    """

    def __wrapped__(cls):
        if name in MODEL_REGISTRY:
            raise ValueError(f"Cannot register duplicate model ({name})")
        if not issubclass(cls, Model):
            raise ValueError(f"Model ({name}: {cls.__name__}) must extend Model")
        MODEL_REGISTRY[name] = cls
        return cls

    return __wrapped__


def create_model(args, place) -> Model:
    """
    Create a model.
    """
    return MODEL_REGISTRY[args.model](args, place)


def add_cmdline_args(parser):
    """ Add cmdline argument of Model. """
    group = parser.add_argument_group("Model")

    # Model
    group.add_argument("--model", type=str, required=True)

    # Config
    group.add_argument("--config_path", type=str, required=True)

    # Model related.
    args, _ = parser.parse_known_args()
    if args.model not in MODEL_REGISTRY:
        raise ValueError(f"Unknown model type: {args.model}")
    MODEL_REGISTRY[args.model].add_cmdline_args(parser)
    return group


import plato2_en_base.models.nsp_model
import plato2_en_base.models.plato
