import React, { useState, useMemo, useRef, useEffect } from 'react';
import { FixedSizeList as List } from 'react-window';

interface VirtualGameListProps {
  games: any[];
  itemHeight: number;
  height: number;
  width: number;
  renderItem: (props: { index: number; style: any; data: any[] }) => React.ReactElement;
}

export const VirtualGameList: React.FC<VirtualGameListProps> = ({
  games,
  itemHeight,
  height,
  width,
  renderItem
}) => {
  const listRef = useRef<List>(null);

  return (
    <List
      ref={listRef}
      height={height}
      width={width}
      itemCount={games.length}
      itemSize={itemHeight}
      itemData={games}
      overscanCount={5} // Renderizar 5 itens extras para smoother scrolling
    >
      {renderItem}
    </List>
  );
};

// Hook para detectar se o elemento está visível
export const useInView = (ref: React.RefObject<HTMLElement>, threshold = 0.1) => {
  const [isInView, setIsInView] = useState(false);

  useEffect(() => {
    const element = ref.current;
    if (!element) return;

    const observer = new IntersectionObserver(
      ([entry]) => {
        setIsInView(entry.isIntersecting);
      },
      { threshold }
    );

    observer.observe(element);
    return () => observer.disconnect();
  }, [ref, threshold]);

  return isInView;
};