"use client";

import { useEffect, useRef, useState } from "react";

interface AnimatedCounterProps {
  value: number;
  suffix?: string;
  duration?: number;
  className?: string;
}

export function AnimatedCounter({
  value,
  suffix = "",
  duration = 1200,
  className,
}: AnimatedCounterProps) {
  const [display, setDisplay] = useState(0);
  const ref = useRef<HTMLSpanElement>(null);
  const hasAnimated = useRef(false);

  useEffect(() => {
    if (hasAnimated.current) return;
    hasAnimated.current = true;

    const start = performance.now();
    function tick(now: number) {
      const elapsed = now - start;
      const progress = Math.min(elapsed / duration, 1);
      // ease-out expo
      const ease = progress === 1 ? 1 : 1 - Math.pow(2, -10 * progress);
      setDisplay(Math.round(ease * value));
      if (progress < 1) requestAnimationFrame(tick);
    }
    requestAnimationFrame(tick);
  }, [value, duration]);

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