import jwt

from jwt import PyJWTError
from datetime import datetime, timedelta
from fastapi import HTTPException, status, Header

from Utils.Authentication import Config


def create_token(*, data: dict, expires_delta: timedelta = None):
    to_encode = dict()

    # 载入用户信息
    user_info = data.copy()
    to_encode.update({"user_info": user_info})

    # 设置过期时间
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=15)
    to_encode.update({"exp": expire})

    # Token编码
    encoded_jwt = jwt.encode(to_encode, Config.SECRET_KEY, algorithm=Config.ALGORITHM)
    return encoded_jwt


def decode_token(token: str):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Invalid Token",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(token, Config.SECRET_KEY, algorithms=[Config.ALGORITHM])
    except PyJWTError:
        raise credentials_exception
    return payload


async def get_token_header(authorization: str = Header(...)):
    """
    获取Token并验证
    :param authorization:
    :return: uid
    """
    token = authorization.split(' ')[-1]  # 获取token
    openid = decode_token(token)  # 验证token
    if not openid:
        raise HTTPException(status_code=400, detail="无效Token")