src/hooks/useCountdown.ts

import { useState, useEffect } from 'react';

interface CountdownData {
  days: number;
  hours: number;
  minutes: number;
  seconds: number;
  isExpired: boolean;
}

export const useCountdown = (targetDate: Date | null): CountdownData => {
  const [countdown, setCountdown] = useState<CountdownData>({
    days: 0,
    hours: 0,
    minutes: 0,
    seconds: 0,
    isExpired: false,
  });

  useEffect(() => {
    if (!targetDate) {
      setCountdown({
        days: 0,
        hours: 0,
        minutes: 0,
        seconds: 0,
        isExpired: true,
      });
      return;
    }

    const updateCountdown = () => {
      const now = new Date().getTime();
      const target = targetDate.getTime();
      const difference = target - now;

      if (difference <= 0) {
        setCountdown({
          days: 0,
          hours: 0,
          minutes: 0,
          seconds: 0,
          isExpired: true,
        });
        return;
      }

      const days = Math.floor(difference / (1000 * 60 * 60 * 24));
      const hours = Math.floor((difference % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
      const minutes = Math.floor((difference % (1000 * 60 * 60)) / (1000 * 60));
      const seconds = Math.floor((difference % (1000 * 60)) / 1000);

      setCountdown({
        days,
        hours,
        minutes,
        seconds,
        isExpired: false,
      });
    };

    // Update immediately
    updateCountdown();

    // Set up interval to update every second
    const interval = setInterval(updateCountdown, 1000);

    return () => clearInterval(interval);
  }, [targetDate]);

  return countdown;
};