"use client";

import { useState, useEffect } from "react";

const COOLING_HOURS = 72;
const COOLING_MS = COOLING_HOURS * 60 * 60 * 1000;

export interface CountdownResult {
  hours: number;
  minutes: number;
  seconds: number;
  isExpired: boolean;
  display: string;
}

export function useCountdown(createdAt: string): CountdownResult {
  const [now, setNow] = useState(Date.now());

  useEffect(() => {
    const timer = setInterval(() => setNow(Date.now()), 1000);
    return () => clearInterval(timer);
  }, []);

  const created = new Date(createdAt).getTime();
  const deadline = created + COOLING_MS;
  const remaining = Math.max(0, deadline - now);

  const totalSeconds = Math.floor(remaining / 1000);
  const hours = Math.floor(totalSeconds / 3600);
  const minutes = Math.floor((totalSeconds % 3600) / 60);
  const seconds = totalSeconds % 60;

  const pad = (n: number) => n.toString().padStart(2, "0");
  const display = `${pad(hours)}:${pad(minutes)}:${pad(seconds)}`;

  return {
    hours,
    minutes,
    seconds,
    isExpired: remaining === 0,
    display,
  };
}