/** Format a Unix timestamp (seconds) as a human-readable relative time string. */
export function relativeTime(unix: number): string {
  const diff = Date.now() - unix * 1000;
  const seconds = Math.floor(diff / 1000);
  const minutes = Math.floor(seconds / 60);
  const hours = Math.floor(minutes / 60);
  const days = Math.floor(hours / 24);

  if (days > 30) {
    const months = Math.floor(days / 30);
    return months === 1 ? "1 month ago" : `${months} months ago`;
  }
  if (days > 0) return days === 1 ? "1 day ago" : `${days} days ago`;
  if (hours > 0) return hours === 1 ? "1 hour ago" : `${hours} hours ago`;
  if (minutes > 0)
    return minutes === 1 ? "1 minute ago" : `${minutes} minutes ago`;
  return "just now";
}