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

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

export function formatCurrency(amount: number, currency = 'USD') {
  return new Intl.NumberFormat('en-US', {
    style: 'currency',
    currency,
  }).format(amount);
}

export function formatDate(date: string | Date) {
  return new Intl.DateTimeFormat('en-US', {
    month: 'short',
    day: 'numeric',
    year: 'numeric',
  }).format(new Date(date));
}

export function formatTime(date: string | Date) {
  return new Intl.DateTimeFormat('en-US', {
    hour: 'numeric',
    minute: '2-digit',
    hour12: true,
  }).format(new Date(date));
}

export function formatRelativeTime(date: string | Date) {
  const now = new Date();
  const then = new Date(date);
  const diffMs = now.getTime() - then.getTime();
  const diffMins = Math.floor(diffMs / 60000);
  if (diffMins < 1) return 'Just now';
  if (diffMins < 60) return `${diffMins}m ago`;
  const diffHours = Math.floor(diffMins / 60);
  if (diffHours < 24) return `${diffHours}h ago`;
  const diffDays = Math.floor(diffHours / 24);
  return `${diffDays}d ago`;
}

export function generateSlug(name: string) {
  return name
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '');
}

export function generateId() {
  return crypto.randomUUID();
}

export function truncate(str: string, length: number) {
  if (str.length <= length) return str;
  return str.slice(0, length) + '...';
}

export function getInitials(name: string) {
  return name
    .split(' ')
    .map((n) => n[0])
    .join('')
    .toUpperCase()
    .slice(0, 2);
}

export function getOrderStatusColor(status: string) {
  const colors: Record<string, string> = {
    pending: 'bg-amber-100 text-amber-700 border-amber-200',
    confirmed: 'bg-blue-100 text-blue-700 border-blue-200',
    preparing: 'bg-purple-100 text-purple-700 border-purple-200',
    ready: 'bg-emerald-100 text-emerald-700 border-emerald-200',
    delivered: 'bg-gray-100 text-gray-700 border-gray-200',
    cancelled: 'bg-red-100 text-red-700 border-red-200',
  };
  return colors[status] || 'bg-gray-100 text-gray-700 border-gray-200';
}

export function getOrderTypeLabel(type: string) {
  const labels: Record<string, string> = {
    dine_in: 'Dine In',
    takeaway: 'Takeaway',
    delivery: 'Delivery',
  };
  return labels[type] || type;
}