import { getFilemd5sum, getBase64 } from './testutil'

const IMAGE_MULTIPART = '/multipart/upload/'
const VIDEO_MULTIPART = '/upload/'

function FileFactory(file) {
  this.offset = 0; //用于断点续传，默认为 0
  this.BYTES_PER_CHUNK = 1024 * 1024
  this.file = file
  this.fileSize = file.size
  this.fileType = file.type
  this.chunkNum =  this.BYTES_PER_CHUNK > this.fileSize ? Math.ceil(this.fileSize / this.BYTES_PER_CHUNK):1
  this.chunkSize = this.BYTES_PER_CHUNK > this.fileSize ? this.fileSize:this.BYTES_PER_CHUNK
}

export default function UploadSdk(host, origin, token, file) {
  
  this.host = host
  this.origin = origin
  this.token = token
  this.file = file
  this.fileFactory = new FileFactory(file)

  this.generateMd5 = function (callback) {
    getFilemd5sum(this.file).then(result => {callback(result)})
  }

  this.generateBase64 = function (callback) {
    getBase64(this.file).then(result => {callback(result)})
  }
  //上传
  this.action = function() {
    this.generateMd5( (md5) => {
      this.md5 = md5
      this.generateBase64( (base64) => {
        this.base64Body = base64
        this.post(this.md5,this.base64Body,this.fileFactory)
      })
    })
  }
  //成功返回函数
  this.onSuccess = function () {
    return 'success'
  }
  //续传
  this.onContinue = function() {
    return 90
  }
  //错误
  this.onError = function() {
    return 200
  }

  this.post = function(md5,base64,fileFactory) {
    return new Promise((resolve, reject) => {
      let xhr = new XMLHttpRequest()
      xhr.open("POSt", this.host+IMAGE_MULTIPART+this.origin, true)
        xhr.withCredentials = true;
        xhr.setRequestHeader('Authorization', `Bearer ${this.token}`);
        xhr.setRequestHeader('Content-Type', 'application/json; charset=utf-8');
        xhr.setRequestHeader('Accept', 'application/json');
        xhr.setRequestHeader('LINK_UPLOAD_FILE_SIZE',fileFactory.fileSize)
        xhr.setRequestHeader('LINK_UPLOAD_CHUNK_INDEX',1+'')
        xhr.setRequestHeader('LINK_UPLOAD_CHUNK_NUM',fileFactory.chunkNum)
        xhr.setRequestHeader('LINK_UPLOAD_CHUNK_SIZE',fileFactory.chunkSize)
        xhr.setRequestHeader('LINK_UPLOAD_OFFSET',fileFactory.offset+'')
        xhr.setRequestHeader('LINK_UPLOAD_FILE_MD5',md5)
        xhr.setRequestHeader('LINK_UPLOAD_FILE_TYPE','jepg')
        xhr.send(JSON.stringify({body: base64}))
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status === 304 || (xhr.status >= 200 && xhr.status < 300)) {
              resolve(xhr.responseText)
            } else {
              reject(xhr.status)
            }
          }
        }
    })
  }
}