import { useEffect, useState } from "react";

export function useElapsed(startedAt: number, duration: number): number {
  const [now, setNow] = useState(() => Date.now() / 1000);
  useEffect(() => {
    const t = setInterval(() => setNow(Date.now() / 1000), 200);
    return () => clearInterval(t);
  }, []);
  return Math.min(duration, Math.max(0, now - startedAt));
}