"""认证依赖"""
import jwt
from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials

from .config import JWT_SECRET, JWT_ALGORITHM

security = HTTPBearer()


def decode_current_user(token: str) -> dict:
    """验证 JWT token，返回用户身份。"""
    try:
        payload = jwt.decode(token, JWT_SECRET, algorithms=[JWT_ALGORITHM])
        return {"username": payload["sub"], "is_admin": payload.get("is_admin", False)}
    except jwt.ExpiredSignatureError:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="登录已过期，请重新登录")
    except jwt.InvalidTokenError:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="无效的认证凭据")


def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security)) -> dict:
    """验证 HTTP Bearer JWT token，返回用户信息。"""
    return decode_current_user(credentials.credentials)


def require_admin(user: dict = Depends(get_current_user)) -> dict:
    """限制仅管理员可访问的管理和敏感配置接口。"""
    if not user.get("is_admin"):
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="需要管理员权限")
    return user