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

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

export function generateUUID() {
  if (typeof globalThis.crypto?.randomUUID === "function") {
    return globalThis.crypto.randomUUID()
  }

  const bytes = new Uint8Array(16)
  if (typeof globalThis.crypto?.getRandomValues === "function") {
    globalThis.crypto.getRandomValues(bytes)
  } else {
    for (let i = 0; i < bytes.length; i += 1) {
      bytes[i] = Math.floor(Math.random() * 256)
    }
  }

  bytes[6] = (bytes[6] & 0x0f) | 0x40
  bytes[8] = (bytes[8] & 0x3f) | 0x80

  const hex = Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0"))
  return [
    hex.slice(0, 4).join(""),
    hex.slice(4, 6).join(""),
    hex.slice(6, 8).join(""),
    hex.slice(8, 10).join(""),
    hex.slice(10, 16).join(""),
  ].join("-")
}

function pad(value: number) {
  return value.toString().padStart(2, "0")
}

export function formatDateTime(value?: string | number | Date | null) {
  if (!value) {
    return "-"
  }

  const date = value instanceof Date ? value : new Date(value)
  if (Number.isNaN(date.getTime())) {
    return "-"
  }

  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}`
}
