"use client";

import { useEffect, useState } from "react";

/** A countdown in whole seconds, started on demand via `start(seconds)` -
 * drives the "Resend in Ns" button state after a 429 throttle response. */
export function useCountdown() {
  const [remaining, setRemaining] = useState(0);

  useEffect(() => {
    if (remaining <= 0) return;
    const timer = setTimeout(() => setRemaining((s) => Math.max(0, s - 1)), 1000);
    return () => clearTimeout(timer);
  }, [remaining]);

  return { remaining, start: (seconds: number) => setRemaining(seconds) };
}