'use client';

import { useEffect, useState } from 'react';

export function formatCooldownSeconds(seconds: number) {
  const safe = Math.max(0, seconds);
  const minutes = Math.floor(safe / 60);
  const rest = safe % 60;
  return `${minutes}:${String(rest).padStart(2, '0')}`;
}

export function useOtpResendCooldown(resendAvailableAt: string | null) {
  const [secondsLeft, setSecondsLeft] = useState(0);

  useEffect(() => {
    if (!resendAvailableAt) {
      setSecondsLeft(0);
      return;
    }

    const tick = () => {
      const diff = Math.ceil((new Date(resendAvailableAt).getTime() - Date.now()) / 1000);
      setSecondsLeft(Math.max(0, diff));
    };

    tick();
    const timer = window.setInterval(tick, 1000);
    return () => window.clearInterval(timer);
  }, [resendAvailableAt]);

  return secondsLeft;
}

export function readOtpResendAvailableAt(recipient: string) {
  if (typeof window === 'undefined' || !recipient) return null;
  try {
    return sessionStorage.getItem(`otp-resend:${recipient.toLowerCase()}`);
  } catch {
    return null;
  }
}

export function writeOtpResendAvailableAt(recipient: string, resendAvailableAt: string) {
  if (typeof window === 'undefined' || !recipient) return;
  try {
    sessionStorage.setItem(`otp-resend:${recipient.toLowerCase()}`, resendAvailableAt);
  } catch {
    // ignore quota errors
  }
}

export function clearOtpResendAvailableAt(recipient: string) {
  if (typeof window === 'undefined' || !recipient) return;
  try {
    sessionStorage.removeItem(`otp-resend:${recipient.toLowerCase()}`);
  } catch {
    // ignore
  }
}