from enum import IntEnum
from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from app.core.biz_exception import NotFoundError, PermissionDeniedError, BizLogicError
from app.core.config import settings
from sqlalchemy.orm import Session
from app.core.database import get_db
from app.services.session_service import SessionService


security = HTTPBearer()


class RoleLevel(IntEnum):
    user = 10
    admin = 100

ROLE_LEVEL_MAP = {
    "user": 10,
    "admin": 100,
}

def require_min_role(min_role: RoleLevel):
    def checker(user=Depends(get_current_user)):
        current_level = ROLE_LEVEL_MAP.get(user.role, 0)
        if current_level < min_role:
            raise PermissionDeniedError("Permission denied")
        return user
    return checker


def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(security),
    db: Session = Depends(get_db)
):
    token = credentials.credentials
    user = SessionService().get_user_by_token(db, token)
    if not user:
        raise PermissionDeniedError("Invalid or expired token")
    return user