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

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

const DEVICE_KEY_STORAGE_KEY = 'matcha-moments-device-key';

export function ensureDeviceKey(): string {
  if (typeof window === 'undefined') return '';
  const existing = window.localStorage.getItem(DEVICE_KEY_STORAGE_KEY);
  if (existing) return existing;
  const next =
    typeof window.crypto?.randomUUID === 'function'
      ? window.crypto.randomUUID()
      : `device-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 8)}`;
  window.localStorage.setItem(DEVICE_KEY_STORAGE_KEY, next);
  return next;
}