// @flow strict

import {useEffect, useState} from 'react';
import {throttle} from 'lodash';


type WindowSize = {
  width: number,
  height: number,
};

const THROTTLE_DURATION = 200;

export function useWindowSize(): WindowSize {
  const [windowSize, setWindowSize] = useState<WindowSize>({
    width: typeof window !== 'undefined' ? window.innerWidth : 0,
    height: typeof window !== 'undefined' ? window.innerHeight : 0,
  });

  useEffect(() => {
    const updateSize = throttle(() => {
      const {innerWidth, innerHeight} = window;
      setWindowSize((prevSize) => {
        if (prevSize.width !== innerWidth || prevSize.height !== innerHeight) {
          return {width: innerWidth, height: innerHeight};
        }
        return prevSize;
      });
    }, THROTTLE_DURATION);

    window.addEventListener('resize', updateSize);
    updateSize();

    return () => {
      window.removeEventListener('resize', updateSize);
      updateSize.cancel();
    };
  }, []);

  return windowSize;
}