import os
from typing import Dict, List, Any, Optional, cast

from fastapi import APIRouter
from pydantic import BaseModel, Field
from sqlalchemy import create_engine, Column, String, Integer, Boolean, JSON,ForeignKey
from sqlalchemy.orm import sessionmaker, declarative_base,relationship
from sqlalchemy.engine.reflection import Inspector

Base = declarative_base()

#orm类
class ConversationOrm(Base):
    __tablename__ = "conversations"

    id = Column(String, primary_key=True)
    user_id = Column(String)
    name = Column(String)
    inputs = Column(JSON)
    status = Column(String)
    introduction = Column(String)
    created_at = Column(Integer)

class UserOrm(Base):
    __tablename__ = "user"

    id = Column(String, primary_key=True)
    createtime = Column(String)

class ParametersOrm(Base):
    __tablename__ = "parameters"

    user_id = Column(String,primary_key=True)
    name = Column(String)
    value = Column(JSON)

class MessagesOrm(Base):
    __tablename__ = "messages"

    id = Column(String,primary_key=True)
    user_id = Column(String)
    conversation_id = Column(String)
    inputs = Column(JSON)
    query = Column(String)
    answer = Column(JSON)

#数据结构
class ConversationModel(BaseModel):
    id: str
    name: str
    inputs: Dict[str, Any]
    status: str
    introduction: str
    created_at: int

    class Config:
        #orm_mode = True
        from_attributes=True

    @classmethod
    def orm(cls):
        return ConversationOrm

class UserModel(BaseModel):
    id: str
    createtime: str

    class Config:
        #orm_mode = True
        from_attributes=True

    @classmethod
    def orm(cls):
        return UserOrm

class ParametersModel(BaseModel):
    user_id : str
    name : str
    value : Dict[str, Any]

    class Config:
        #orm_mode = True
        from_attributes=True

    @classmethod
    def orm(cls):
        return ParametersOrm

class MessagesModel(BaseModel):
    id :str
    conversation_id :str
    inputs : Dict[str, Any]
    query : str
    answer : Dict[str, Any]

    class Config:
        #orm_mode = True
        from_attributes=True

    @classmethod
    def orm(cls):
        return MessagesOrm

class DBManager:
    def __init__(self) -> None:
        DATABASE_URL = os.getenv("SQLITE_DATABASE_URL")
        self._engine = create_engine(DATABASE_URL)
        self.SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=self._engine)
    
    def createTable(self,tableName:str):
        if self._engine is None:
            return
        if not self.exist(tableName):
            Base.metadata.tables[tableName].create(self._engine)

    def addRecord(self,tableName:str,record:Dict[str,Any]):
        ormCls = self._get_orm(tableName)
        if ormCls is None:
            return 
        session = self.SessionLocal()
        data = ormCls(**record)
        session.add(data)
        session.commit()

    def addRecords(self,tableName:str,records:List[Dict[str,Any]]):
        ormCls = self._get_orm(tableName)
        if ormCls is None:
            return 
        datas = []
        session = self.SessionLocal()
        for record in records:
            datas.append(ormCls(**record))
        session.add(datas)
        session.commit()
 
    def delete(self,tableName:str,**filter):
        session = self.SessionLocal()
        ormCls = self._get_orm(tableName)
        if ormCls is None:
            return 
        records = session.query(ormCls).filter_by(**filter).all()
        if records is not None:
            session.delete(records)
            session.commit()
    
    def update(self,tableName:str,data:Dict[str,Any],**filter):
        session = self.SessionLocal()
        ormCls = self._get_orm(tableName)
        if ormCls is None:
            return 
        record = session.query(ormCls).filter_by(**filter).first()
        if record is not None:
            record.update(data)
            session.commit()    

    def query(self,tableName:str,**filter):
        session = self.SessionLocal()
        ormCls = self._get_orm(tableName)
        if ormCls is None:
            return 
        modelCls = self._get_model(ormCls)
        if modelCls is None:
            return 
        
        if filter is not None:
            records = session.query(ormCls).filter_by(**filter).all()
        else:
            records = session.query(ormCls).all() 

        datas  = []
        for record in records:
            datas.append(modelCls.from_orm(record))
        return datas

    def exist(self,tableName:str)->bool:
        if self._engine is None:
            return
        inspector = Inspector.from_engine(self._engine)
        return inspector.has_table(tableName)

    def _get_orm(self,tableName:str):
        subClss = Base.__subclasses__()
        for sunCls in subClss:
            if sunCls.__tablename__ == tableName:
                return sunCls
        return None

    def _get_model(self,orm:Any):
        subClss = BaseModel.__subclasses__()
        for sunCls in subClss:
            if 'orm' in sunCls.__dict__ and sunCls.orm() == orm:
                return sunCls
        return None