import { md5 } from 'js-md5'
import crc from 'crc'

// 周数组转换
export function convertWeekdaysToNumber(weekDay) {
  let weekStr = '00000000'

  // eslint-disable-next-line no-restricted-syntax
  for (const day of weekDay) {
    const index = day % 7
    weekStr = weekStr.substring(0, index) + '1' + weekStr.substring(index + 1)
  }

  // 倒序 weekStr
  weekStr = weekStr.split('').reverse().join('')

  return parseInt(weekStr, 2)
}

// 时间戳转二进制
export function timestampToArray(timestamp) {
  const array = new Uint8Array(4)
  array[0] = (timestamp & 0xff000000) >> 24
  array[1] = (timestamp & 0xff0000) >> 16
  array[2] = (timestamp & 0xff00) >> 8
  array[3] = timestamp & 0xff
  return array
}

// md5加密
export function md5Encrypt(text, token, key) {
  const length = text.length + 4 + 16
  const md5Array = new Uint8Array(length)

  for (let i = 0; i < text.length; i++) {
    md5Array[i] = text.charCodeAt(i)
  }

  md5Array.set(token, text.length)
  md5Array.set(key, text.length + 4)

  const md5Text = md5(md5Array)
  return new Uint8Array(md5Text.match(/.{1,2}/g).map(byte => parseInt(byte, 16)))
}

// 生成包尾 头部数据+内容数据
export function createPackageEnd(headArray, contentArray) {
  // 拼接头部和内容
  let mergerArray = new Uint8Array(headArray.length + contentArray.length)
  mergerArray.set(headArray)
  mergerArray.set(contentArray, headArray.length)

  // crc加密
  const crcResult = crc.crc16kermit(mergerArray)

  // 拼接crc
  let newArray = new Uint8Array(mergerArray.length + 2)
  newArray.set(mergerArray)
  newArray.set([crcResult / 256, crcResult % 256], mergerArray.length)

  return newArray
}

// 二进制转时间戳
export function arrayToTimestamp(array) {
  const timestamp = (array[0] << 24) | (array[1] << 16) | (array[2] << 8) | array[3]
  return timestamp >>> 0
}

// 二进制转字符串
export function uint8ArrayToString(uint8Array) {
  let str = ''
  for (let i = 0; i < uint8Array.length; i++) {
    if (uint8Array[i] !== 0) {
      str += String.fromCharCode(uint8Array[i])
    }
  }
  return str
}