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from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import jwt, JWTError
from .utils.db import tinydb_helper  # Ensure correct import path
from .utils.jwt_utils import SECRET_KEY, ALGORITHM  # Ensure these are defined in our jwt_utils.py

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

def decode_access_token(token: str, credentials_exception) -> dict:
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        user_id: str = payload.get("sub")
        name: str = payload.get("name")
        role: str = payload.get("role")
        if user_id is None or name is None or role is None:
            raise credentials_exception
        return {"user_id": user_id, "name": name, "role": role}
    except jwt.PyJWTError:
        raise credentials_exception

async def get_current_user(token: str = Depends(oauth2_scheme)) -> dict:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    return decode_access_token(token, credentials_exception)