from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from sqlalchemy.orm import Session
from ..database import get_db
from ..services.auth_service import decode_token, get_user_by_id

bearer_scheme = HTTPBearer()


def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
    db: Session = Depends(get_db),
):
    payload = decode_token(credentials.credentials)
    if not payload:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Token inválido o expirado")
    user_id = int(payload.get("sub", 0))
    user = get_user_by_id(db, user_id)
    if not user or not user.is_active:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Usuario no encontrado")
    return user


def require_admin(user=Depends(get_current_user)):
    """Solo permite acceso a usuarios con rol ADMIN."""
    if user.role != "ADMIN":
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Acceso denegado: requiere rol ADMIN")
    return user


def require_staff(user=Depends(get_current_user)):
    """Permite acceso a EMPLEADO o ADMIN (personal del gobierno)."""
    if user.role not in ("EMPLEADO", "ADMIN"):
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Acceso denegado: requiere rol EMPLEADO o ADMIN")
    return user