/**
 * Utility Functions
 * Common utility functions for the application
 */
import { type ClassValue, clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';

/**
 * Merge class names with Tailwind CSS classes
 */
export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

/**
 * Format relative time (e.g., "2 minutes ago")
 */
export function formatRelativeTime(date: string | Date): string {
  const now = new Date();
  const then = new Date(date);
  const diffMs = now.getTime() - then.getTime();
  const diffSec = Math.floor(diffMs / 1000);
  const diffMin = Math.floor(diffSec / 60);
  const diffHour = Math.floor(diffMin / 60);
  const diffDay = Math.floor(diffHour / 24);
  
  if (diffSec < 60) {
    return 'just now';
  } else if (diffMin < 60) {
    return `${diffMin} minute${diffMin > 1 ? 's' : ''} ago`;
  } else if (diffHour < 24) {
    return `${diffHour} hour${diffHour > 1 ? 's' : ''} ago`;
  } else if (diffDay < 7) {
    return `${diffDay} day${diffDay > 1 ? 's' : ''} ago`;
  } else {
    return then.toLocaleDateString();
  }
}

/**
 * Format duration in seconds to human-readable string
 */
export function formatDuration(seconds: number): string {
  const hours = Math.floor(seconds / 3600);
  const minutes = Math.floor((seconds % 3600) / 60);
  const secs = seconds % 60;
  
  if (hours > 0) {
    return `${hours}h ${minutes}m`;
  } else if (minutes > 0) {
    return `${minutes}m ${secs}s`;
  } else {
    return `${secs}s`;
  }
}

/**
 * Delay for a specified number of milliseconds
 */
export function delay(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

/**
 * Truncate text with ellipsis
 */
export function truncate(text: string, maxLength: number): string {
  if (text.length <= maxLength) {
    return text;
  }
  return text.slice(0, maxLength - 3) + '...';
}
