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from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from firebase_admin import auth
from firebase_admin.auth import ExpiredIdTokenError, InvalidIdTokenError
from . import db

security = HTTPBearer()


def get_current_user(

    credentials: HTTPAuthorizationCredentials = Depends(security),

):
    try:
        payload = auth.verify_id_token(credentials.credentials)
        user_doc_ref = db.collection("user").document(payload["sub"]).get()
        if not user_doc_ref.exists:
            raise HTTPException(status_code=400, detail="User profile not found")
    except ExpiredIdTokenError as e:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Token expired",
            headers={"WWW-Authenticate": "Bearer"},
        )
    except InvalidIdTokenError as e:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token",
            headers={"WWW-Authenticate": "Bearer"},
        )
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token",
            headers={"WWW-Authenticate": "Bearer"},
        )

    except Exception as e:
        raise HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR)

    return payload