import { useEffect, useRef, useState } from "react";
import { useInView } from "framer-motion";

export function Counter({ to, suffix = "", duration = 2000 }: { to: number; suffix?: string; duration?: number }) {
  const ref = useRef<HTMLSpanElement>(null);
  const inView = useInView(ref, { once: true });
  const [value, setValue] = useState(0);

  useEffect(() => {
    if (!inView) return;
    let raf = 0;
    const start = performance.now();
    const tick = (now: number) => {
      const progress = Math.min((now - start) / duration, 1);
      const eased = 1 - Math.pow(1 - progress, 3);
      setValue(Math.round(eased * to));
      if (progress < 1) raf = requestAnimationFrame(tick);
    };
    raf = requestAnimationFrame(tick);
    return () => cancelAnimationFrame(raf);
  }, [inView, to, duration]);

  return (
    <span ref={ref}>
      {value}
      {suffix}
    </span>
  );
}