"""Detección de valores nulos / vacíos."""
from __future__ import annotations

from typing import Any

import numpy as np
import pandas as pd


def _is_nullish_scalar(x: Any) -> bool:
  if x is None or x is pd.NA:
    return True
  if isinstance(x, (bool, np.bool_)):
    return False
  if isinstance(x, (int, float, np.integer, np.floating)) and not isinstance(
    x, (bool, np.bool_)
  ):
    if isinstance(x, float) and (np.isnan(x) or pd.isna(x)):
      return True
    return False
  t = str(x).strip().lower()
  if not t or t in ("nan", "none", "nat", "null", "<na>"):
    return True
  return False