from typing import TypeVar, Generic, Any, List, get_args, Union
from sqlalchemy.orm import Session
from Utils.SqlAlchemyUtils import Base, get_db
from pydantic import BaseModel
from fastapi import APIRouter, Depends
from pydantic.generics import GenericModel


class QueryBase(BaseModel):
    page_size: Union[int, None]
    page: Union[int, None]


class ItemId(BaseModel):
    id: Any


ModelType = TypeVar("ModelType", bound=BaseModel)
CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
QuerySchemaType = TypeVar("QuerySchemaType", bound=QueryBase)
# UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
DbModelType = TypeVar("DbModelType", bound=Base)

DataType = TypeVar("DataType", BaseModel, Any)


class BaseResponseModel(GenericModel, Generic[DataType]):
    state: int
    msg: str
    data: DataType


def get_generic_type_arg(cls):
    t = cls.__orig_bases__[0]
    return get_args(t)[0]


class CRUDBase(Generic[DbModelType, ModelType, CreateSchemaType, UpdateSchemaType, QuerySchemaType]):

    def __init__(self,
                 db_model: DbModelType,
                 model_type: BaseModel,
                 create_schema_type: CreateSchemaType,
                 update_schema_type: UpdateSchemaType,
                 query_schema_type: QuerySchemaType, name: str, chinese_name: str = ''):
        self.db_model = db_model
        self.name = name
        self.model_type = model_type
        self.create_schema_type = create_schema_type
        self.update_schema_type = update_schema_type
        self.query_schema_type = query_schema_type
        self.summary_name = chinese_name if chinese_name else self.name

    def mount(self, router: APIRouter):
        for key in self.__dir__():
            if key.endswith('_create'):
                getattr(self, key)(router)

    def add_route_func_create(self, router: APIRouter):
        create_schema_type = self.create_schema_type

        @router.post(f'/{self.name}/add',
                     response_model=BaseResponseModel[self.model_type],
                     summary=f"添加{self.summary_name}")
        def add_route_func(create_model_obj: create_schema_type, db: Session = Depends(get_db)):
            new_item = self.add(db, create_model_obj)
            item_info = new_item.to_dict()
            return BaseResponseModel(state=1, msg="", data=self.model_type(**item_info))

        return add_route_func

    def update_route_func_create(self, router: APIRouter):
        update_schema_type = self.update_schema_type

        @router.post(f'/{self.name}/update',
                     response_model=BaseResponseModel[Any],
                     summary=f"修改{self.summary_name}")
        def update_route_func(update_model_obj: update_schema_type, db: Session = Depends(get_db)):
            self.update(db, update_model_obj)
            return BaseResponseModel(state=1, msg="", data={})

        return update_route_func

    def delete_route_func_create(self, router: APIRouter):
        @router.post(f'/{self.name}/delete',
                     response_model=BaseResponseModel[Any],
                     summary=f"删除{self.summary_name}")
        def delete_route_func(item_id: ItemId, db: Session = Depends(get_db)):
            self.delete(db, item_id.id)
            return BaseResponseModel(state=1, msg="", data={})

        return delete_route_func

    def get_route_func_create(self, router: APIRouter):
        @router.post(f'/{self.name}/get',
                     response_model=BaseResponseModel[self.model_type],
                     summary=f"获取{self.summary_name}")
        def get_route_func(item_id: ItemId, db: Session = Depends(get_db)):
            item = self.get(db, item_id.id)
            return BaseResponseModel(state=1, msg="", data=item.to_dict())

        return get_route_func

    def query_route_func_create(self, router: APIRouter):
        model_type = self.model_type
        query_schema_type = self.query_schema_type

        class QueryRes(BaseModel, Generic[ModelType]):
            count: int
            item_list: List[model_type]

        @router.post(f'/{self.name}/query',
                     response_model=BaseResponseModel[QueryRes],
                     summary=f"查询{self.summary_name}")
        def query_route_func(params: query_schema_type, db: Session = Depends(get_db)):
            count, query = self.query(db, params)
            item_list = [item.to_dict() for item in query]
            return BaseResponseModel(state=1, msg="", data=QueryRes(count=count, item_list=item_list))

        return query_route_func

    def add(self, db: Session, create_model_obj: CreateSchemaType) -> ModelType:
        new_item = self.db_model(**create_model_obj.dict())
        db.add(new_item)
        db.commit()
        db.refresh(new_item)
        return new_item

    def delete(self, db: Session, item_id):
        if type(item_id) == list:
            db.query(self.db_model).filter(getattr(self.db_model, 'id').in_(item_id)).delete()
        else:
            db.query(self.db_model).filter_by(id=item_id).delete()

    def update(self, db: Session, update_model_obj: UpdateSchemaType):
        db.query(self.db_model).filter_by(id=update_model_obj.id).update(update_model_obj.dict())
        db.commit()

    def query(self, db: Session, params: QuerySchemaType) -> [int, List[ModelType]]:
        params_dict = params.dict()
        query = db.query(self.db_model)
        for key, value in params_dict.items():
            if key not in ['page', 'page_size'] and value is not None:
                if type(value) == str:
                    query = query.filter(getattr(self.db_model, key).like(f'%{value}%'))
                if type(value) in [int, float]:
                    query = query.filter_by(**{key: value})
        count = query.count()
        if params.page is not None and params.page_size is not None:
            query = query.offset((params.page - 1) * params.page_size).limit(params.page).all()
        return count, query

    def get(self, db: Session, item_id) -> ModelType:
        return db.query(self.db_model).get(item_id)