from datetime import datetime, timedelta
from typing import Any, Union, Optional
import jwt
from fastapi.security import OAuth2PasswordBearer
from passlib.context import CryptContext
from app.core.config import settings
from cryptography.fernet import Fernet

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
ALGORITHM = "HS256"

# Token认证
reusable_oauth2 = OAuth2PasswordBearer(
    tokenUrl=f"{settings.API_V1_STR}/login/access-token"
)


def create_access_token(
        subject: Union[str, Any], expires_delta: timedelta = None
) -> str:
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(
            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
        )
    to_encode = {"exp": expire, "sub": str(subject)}
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    return pwd_context.hash(password)


def decrypt(data, key) -> Optional[bytes]:
    """
    解密二进制数据
    """
    fernet = Fernet(key)
    try:
        return fernet.decrypt(data)
    except Exception as e:
        print(str(e))
        return None