import { getFilemd5sum, getBase64 } from './utils.js'

interface upload_sdk {

  //初始化文件 md5 
  generateMd5: (file: File) => any
  //初始化图片 base64
  generateBase64: (file: File) =>any
  //上传
  action: () => Promise<any>
  //成功返回函数
  onSuccess: () => string
  //续传
  onContinue: () => number
  //错误
  onError: () => number
  //http 请求
  post: () => Promise<any>

}

class UploadSdk implements upload_sdk {

  private host: string
  private origin: string
  private token: string
  private file: File
  private base64: any
  private BYTES_PER_CHUNK: number = 1024 * 1024
  private IMAGE_MULTIPART = '/multipart/upload/'
  private VIDEO_MULTIPART = '/upload/'
  private chunkNum: any
  private chunkSize: any
  private fileType: any
  private fileSize: any
  private base64Body: any
  private md5: any
  private offset = 0; //用于断点续传，默认为 0

  constructor(host: string, origin: string, token: string, file: File){
    this.host = host
    this.origin = origin
    this.token = token
    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
  }

  generateMd5 = async () => {
    let md5 = await getFilemd5sum(this.file)
    return md5
  }

  generateBase64 = async () => {
    let base64 = await getBase64(this.file)
    return base64
  }
  //上传
  action = () => {
    this.md5 = this.generateMd5()
    this.base64Body = this.generateBase64()
    return this.post()
  }
  //成功返回函数
  onSuccess =  () => {
    return 'success'
  }
  //续传
  onContinue = () => {
    return 90
  }
  //错误
  onError = () => {
    return 200
  }

  post = () => {
    return new Promise((resolve, reject) => {
      let xhr = new XMLHttpRequest()
      xhr.open("POSt", 'http://api.links123.net/mps/v1/'+this.IMAGE_MULTIPART+'forum', 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',this.fileSize)
        xhr.setRequestHeader('LINK_UPLOAD_CHUNK_INDEX',1+'')
        xhr.setRequestHeader('LINK_UPLOAD_CHUNK_NUM',this.chunkNum)
        xhr.setRequestHeader('LINK_UPLOAD_CHUNK_SIZE',this.chunkSize)
        xhr.setRequestHeader('LINK_UPLOAD_OFFSET',this.offset+'')
        xhr.setRequestHeader('LINK_UPLOAD_FILE_MD5',this.md5)
        xhr.setRequestHeader('LINK_UPLOAD_FILE_TYPE','jepg')
        xhr.send(JSON.stringify({body: this.base64Body}))
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status === 304 || (xhr.status >= 200 && xhr.status < 300)) {
              resolve(xhr.responseText)
            } else {
              reject(xhr.status)
            }
          }
        }
    })
  }

}