from datetime import datetime, timedelta
from typing import Optional
from jose import JWTError, jwt
from config.settings import get_settings

settings = get_settings()


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """创建访问令牌"""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(
            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
        )
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(
        to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
    )
    return encoded_jwt


def decode_access_token(token: str) -> Optional[dict]:
    """解码访问令牌"""
    try:
        payload = jwt.decode(
            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
        )
        return payload
    except JWTError:
        return None
