import CryptoJS from 'crypto-js'
const key = '49PBou+TREIOzSHj'
const key1 = CryptoJS.enc.Utf8.parse('dmngJmmO+9GMw+tu')
const key2 = CryptoJS.enc.Utf8.parse(key)
// 固定IV 用于密码、get请求参数加密
const defaultIv = CryptoJS.enc.Utf8.parse('5lDsNRe&UduJ97uS')

// 密钥派生参数配置
const PBKDF2_CONFIG = {
  // 盐值长度（bits）
  saltSize: 128,
  // 迭代次数
  iterations: 10000,
  // 密钥长度（256bit）
  keySize: 256 / 32,
  hashAlgorithm: CryptoJS.algo.SHA256
}

// 动态密钥派生器
const deriveDynamicKey = (token, salt) => {
  if (!token || typeof token !== 'string') {
    throw new Error('Invalid user token')
  }

  return CryptoJS.PBKDF2(token, salt, {
    keySize: PBKDF2_CONFIG.keySize,
    iterations: PBKDF2_CONFIG.iterations,
    hasher: PBKDF2_CONFIG.hashAlgorithm
  })
}

// 动态IV生成器
export const generateDynamicIV = () => {
  // 1. 获取当前时间戳（8字节，64位）
  const timestamp = Date.now()
  // 将时间戳转换为8字节的WordArray（大端序）
  const timestampBytes = CryptoJS.enc.Hex.parse(
    timestamp.toString(16).padStart(16, '0')
  )

  // 2. 生成8字节随机数
  const randomBytes = CryptoJS.lib.WordArray.random(8)

  // 3. 构造IV（16字节）
  const ivWords = [
    // 前4字节：随机数的高4字节
    randomBytes.words[0],
    // 接下来4字节：时间戳的高4字节
    timestampBytes.words[0],
    // 接下来4字节：随机数的低4字节
    randomBytes.words[1],
    // 最后4字节：时间戳的低4字节
    timestampBytes.words[1]
  ]

  return CryptoJS.lib.WordArray.create(ivWords, 16)
}

const xorEncrypt = (text) => {
  let encrypted = ''
  for (let i = 0; i < text.length; i++) {
    const charCode = text.charCodeAt(i) ^ key.charCodeAt(i % key.length)
    encrypted += String.fromCharCode(charCode)
  }

  return btoa(encrypted)
}

const xorDecrypt = (encryptedBase64) => {
  // 从Base64解码
  const decodedStr = atob(encryptedBase64)
  let decrypted = ''

  // 异或解密
  for (let i = 0; i < decodedStr.length; i++) {
    const charCode = decodedStr.charCodeAt(i) ^ key.charCodeAt(i % key.length)
    decrypted += String.fromCharCode(charCode)
  }

  return decrypted
}

// AES加密
export const encryptByAes = (params, type = 'dynamic', token) => {
  try {
    const isDynamic = type === 'dynamic'
    // 生成随机盐值
    const salt = CryptoJS.lib.WordArray.random(PBKDF2_CONFIG.saltSize)
    // 动态派生密钥
    const derivedKey = isDynamic ? deriveDynamicKey(token, salt) : key2
    // 生成动态iv
    const iv = isDynamic ? generateDynamicIV() : defaultIv
    const data = typeof params === 'string' ? params : JSON.stringify(params)
    const srcs = CryptoJS.enc.Utf8.parse(data)

    const encrypted = CryptoJS.AES.encrypt(srcs, derivedKey, {
      iv: iv,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7
    })

    if (isDynamic) {
      const str = encrypted.ciphertext.toString(CryptoJS.enc.Base64) + '|' + iv.toString(CryptoJS.enc.Base64) + '|' + salt.toString(CryptoJS.enc.Base64) + '|' + token
      return xorEncrypt(str)
    }
    return encrypted.ciphertext.toString(CryptoJS.enc.Base64)
  } catch (error) {
    console.error('Encryption error:', error)
    throw new Error('Encryption failed')
  }
}

const isValidBase64 = (str) => {
  try {
    return btoa(atob(str)) === str
  } catch (e) {
    return false
  }
}

export const decryptByAes = (ciphertext) => {
  try {
    // 初始化解密参数
    let cipherToDecrypt = ciphertext
    let iv = defaultIv
    let key = key2

    // 尝试XOR解密并解析参数
    const decryptedStr = xorDecrypt(ciphertext)
    const parts = decryptedStr.split('|')
    if (parts.length === 4) {
      const [ciphertextBase64, ivBase64, saltBase64, token] = parts

      if (token && !(isValidBase64(ivBase64) && isValidBase64(saltBase64))) {
        console.error('解密失败: 无效的IV参数或salt参数！')
        return ''
      }
      // 转换编码
      iv = CryptoJS.enc.Base64.parse(ivBase64)
      const salt = CryptoJS.enc.Base64.parse(saltBase64)
      // 动态派生密钥
      key = deriveDynamicKey(token, salt)
      cipherToDecrypt = ciphertextBase64
    }

    // 解密
    const decrypted = CryptoJS.AES.decrypt({
        ciphertext: CryptoJS.enc.Base64.parse(cipherToDecrypt)
      },
      key, {
        iv,
        mode: CryptoJS.mode.CBC,
        padding: CryptoJS.pad.Pkcs7
      }
    )

    return decrypted.toString(CryptoJS.enc.Utf8).trim()
  } catch (error) {
    console.error('AES解密失败:', error)
    return ''
  }
}