import { type ClassValue, clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';
import { format, formatDistanceToNow } from 'date-fns';

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

export function formatDate(date: string | Date, fmt = 'MMM d, yyyy') {
  return format(new Date(date), fmt);
}

export function formatDateTime(date: string | Date) {
  return format(new Date(date), 'MMM d, yyyy HH:mm');
}

export function timeAgo(date: string | Date) {
  return formatDistanceToNow(new Date(date), { addSuffix: true });
}

export function getRatingLabel(rating: number): string {
  const labels: Record<number, string> = {
    1: 'Very Poor', 2: 'Poor', 3: 'Average', 4: 'Good', 5: 'Excellent',
  };
  return labels[rating] || 'Unknown';
}

export function getRatingColor(rating: number): string {
  if (rating <= 2) return 'text-red-500';
  if (rating === 3) return 'text-yellow-500';
  return 'text-green-500';
}

export function getPaymentStatusColor(status: string): string {
  const map: Record<string, string> = {
    paid: 'bg-green-100 text-green-800',
    PAID: 'bg-green-100 text-green-800',
    approved: 'bg-green-100 text-green-800',
    pending: 'bg-yellow-100 text-yellow-800',
    not_required: 'bg-gray-100 text-gray-800',
    rejected: 'bg-red-100 text-red-800',
  };
  return map[status] || 'bg-gray-100 text-gray-600';
}

export function getStatusColor(status: string): string {
  const map: Record<string, string> = {
    approved: 'bg-green-100 text-green-800',
    pending: 'bg-yellow-100 text-yellow-800',
    rejected: 'bg-red-100 text-red-800',
  };
  return map[status] || 'bg-gray-100 text-gray-600';
}

export function buildQueryString(params: Record<string, string | number | boolean | undefined | null>): string {
  const qs = Object.entries(params)
    .filter(([, v]) => v !== undefined && v !== null && v !== '')
    .map(([k, v]) => `${k}=${encodeURIComponent(String(v))}`)
    .join('&');
  return qs ? `?${qs}` : '';
}