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

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

/** 幂等键：优先 Web Crypto，HTTP/旧环境回退为类 UUID 字符串 */
export function randomIdempotentKey(): string {
  if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
    return crypto.randomUUID()
  }
  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
    const r = (Math.random() * 16) | 0
    const v = c === "x" ? r : (r & 0x3) | 0x8
    return v.toString(16)
  })
}