import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

/**
 * Format a date as relative time (e.g., "2 minutes ago", "1 hour ago")
 */
export function formatRelativeTime(dateString: string): string {
  const date = new Date(dateString);
  const now = new Date();
  const diffInMs = now.getTime() - date.getTime();
  const diffInSeconds = Math.floor(diffInMs / 1000);

  if (diffInSeconds < 60) {
    return diffInSeconds <= 1 ? "just now" : `${diffInSeconds} seconds ago`;
  }

  const diffInMinutes = Math.floor(diffInSeconds / 60);
  if (diffInMinutes < 60) {
    return diffInMinutes === 1 ? "1 minute ago" : `${diffInMinutes} minutes ago`;
  }

  const diffInHours = Math.floor(diffInMinutes / 60);
  if (diffInHours < 24) {
    return diffInHours === 1 ? "1 hour ago" : `${diffInHours} hours ago`;
  }

  const diffInDays = Math.floor(diffInHours / 24);
  if (diffInDays < 30) {
    return diffInDays === 1 ? "1 day ago" : `${diffInDays} days ago`;
  }

  const diffInMonths = Math.floor(diffInDays / 30);
  if (diffInMonths < 12) {
    return diffInMonths === 1 ? "1 month ago" : `${diffInMonths} months ago`;
  }

  const diffInYears = Math.floor(diffInMonths / 12);
  return diffInYears === 1 ? "1 year ago" : `${diffInYears} years ago`;
}