import AES from 'crypto-js'

//加密方法
export function Encrypt(word) {
  //十六位十六进制数作为密钥
  const key = AES.enc.Utf8.parse('0123456789ASDFGH')
//十六位十六进制数作为密钥偏移量
  const iv = AES.enc.Utf8.parse('ASDFGH0123456789')

  const src = AES.enc.Utf8.parse(word)
  const encrypted = AES.AES.encrypt(
    src,
    key,
    {
      iv: iv,
      mode: AES.mode.CBC,
      padding: AES.pad.Pkcs7
    })
  return encrypted.ciphertext.toString().toUpperCase()
}

//解密方法
export function Decrypt(word) {
  const encryptedHexStr = AES.enc.Hex.parse(word)
  const src = AES.enc.Base64.stringify(encryptedHexStr)
  const decrypt = AES.AES.decrypt(
    src,
    key,
    {
      iv: iv,
      mode: AES.mode.CBC,
      padding: AES.pad.Pkcs7
    })
  const decryptedStr = decrypt.toString(AES.enc.Utf8)
  return decryptedStr.toString()

}

// 节流
export function throttle(fn, time) {
  let timer = null
  time = time || 1000
  return function(...args) {
    if (timer) {
      return
    }
    const _this = this
    timer = setTimeout(() => {
      timer = null
    }, time)
    fn.apply(_this, args)
  }
}

// 防抖
export function debounce(fn, time) {
  time = time || 200
  // 定时器
  let timer = null
  return function(...args) {
    var _this = this
    if (timer) {
      clearTimeout(timer)
    }
    timer = setTimeout(function() {
      timer = null
      fn.apply(_this, args)
    }, time)
  }
}

export function debounceMax(func, wait, immediate = false) {
  let timeout
  return function() {
    let context = this
    let args = arguments
    if (timeout) clearTimeout(timeout)
    if (immediate) {
      var callNow = !timeout
      timeout = setTimeout(() => {
        timeout = null
      }, wait)
      if (callNow) func.apply(context, args)
    } else {
      timeout = setTimeout(function() {
        func.apply(context, args)
      }, wait)
    }
  }
}

export function getClientIP(onNewIP) {
  let MyPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection
  let pc = new MyPeerConnection({
    iceServers: []
  })
  let noop = () => {
  }
  let localIPs = {}
  let ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g
  let iterateIP = (ip) => {
    if (!localIPs[ip]) onNewIP(ip)
    localIPs[ip] = true
  }
  pc.createDataChannel('')
  pc.createOffer().then((sdp) => {
    sdp.sdp.split('\n').forEach(function(line) {
      if (line.indexOf('candidate') < 0) return
      line.match(ipRegex).forEach(iterateIP)
    })
    pc.setLocalDescription(sdp, noop, noop)
  }).catch((reason) => {
  })
  pc.onicecandidate = (ice) => {
    if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return
    ice.candidate.candidate.match(ipRegex).forEach(iterateIP)
  }
}