import CryptoJS from 'crypto-js'

/** 与 tyc-webview-v2 `utils/crypto.js` 一致：AES-CBC，IV 前置后 Base64 */
export function aesEncrypt(plainText: string, hexKey: string): string {
  const key = CryptoJS.enc.Hex.parse(hexKey)
  const iv = generateRandomIV()
  const encrypted = CryptoJS.AES.encrypt(plainText, key, {
    iv,
    padding: CryptoJS.pad.Pkcs7,
    mode: CryptoJS.mode.CBC,
  })
  const ivAndCipherText = iv.concat(encrypted.ciphertext)
  return CryptoJS.enc.Base64.stringify(ivAndCipherText)
}

function generateRandomIV() {
  const iv: number[] = []
  for (let i = 0; i < 16; i++)
    iv.push(Math.floor(Math.random() * 256))
  return CryptoJS.enc.Hex.parse(iv.map(b => b.toString(16).padStart(2, '0')).join(''))
}

/** 与 H5 `InquireForm.vue` 中 `aesEncrypt(..., key)` 使用的密钥一致 */
export const QUERY_PAYLOAD_AES_HEX_KEY = 'ff83609b2b24fc73196aac3d3dfb874f'