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

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

/**
 * Generate a UUID v4. Uses `crypto.randomUUID()` when available (secure
 * contexts), otherwise falls back to `crypto.getRandomValues()`.
 */
export function randomUUID(): string {
  if (
    typeof crypto !== "undefined" &&
    typeof crypto.randomUUID === "function"
  ) {
    return crypto.randomUUID()
  }
  // Fallback for non-secure contexts (HTTP over LAN)
  const bytes = new Uint8Array(16)
  crypto.getRandomValues(bytes)
  // Set version 4 and variant bits
  bytes[6] = (bytes[6] & 0x0f) | 0x40
  bytes[8] = (bytes[8] & 0x3f) | 0x80
  const hex = Array.from(bytes, (b) => b.toString(16).padStart(2, "0")).join("")
  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`
}