#
# Copyright (c) 2021 the Hugging Face team.
#
# 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.#
from datetime import datetime
from typing import Optional

from pydantic import BaseModel, validator


class CoreModel(BaseModel):
    """
    Any common logic to be shared by all models goes here.
    """

    pass


class DateTimeModelMixin(BaseModel):
    created_at: Optional[datetime]
    updated_at: Optional[datetime]

    @validator("created_at", "updated_at", pre=True)
    def default_datetime(cls, value: datetime) -> datetime:
        return value or datetime.datetime.now()


class IDModelMixin(BaseModel):
    id: int
