from contextlib import asynccontextmanager

from fastapi import FastAPI, HTTPException, Response, Depends, APIRouter
from typing import Optional, Annotated
from datetime import datetime, timedelta
from jose import JWTError, jwt

from sqlmodel import Session, select

from database import create_db_and_tables, engine
from models import Tenant, User, Project

# 用于生成和验证JWT的密钥
SECRET_KEY = "your_secret_key"
ALGORITHM = "HS256"


# @app.on_event("startup")
# def on_startup():
#     create_db_and_tables()
@asynccontextmanager
async def lifespan(app: FastAPI):
    create_db_and_tables()
    yield


def get_session():
    with Session(engine) as session:
        yield session


# 生成JWT token
def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=15)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


app = FastAPI(lifespan=lifespan)
SessionDep = Annotated[Session, Depends(get_session)]


# 登录路由
@app.post("/api/s1/login")
async def login(response: Response, user_data: dict, session: SessionDep):
    # 查询用户
    user = session.exec(select(User).where(User.username == user_data['username'])).first()

    # 验证用户名和密码
    if not user or user.password != user_data['password']:
        raise HTTPException(status_code=401, detail="Login failed")

    # 生成JWT token
    token = create_access_token(data={"id": user.id, "role": user.role, "tanant_id": user.tenant.id})

    # 设置cookie
    response.set_cookie(key="session_token", value=token, httponly=True)

    # 关闭数据库会话
    session.close()

    return {"message": f"Login successful"}