import OSS from 'ali-oss'
import { v4 as uuidv4 } from 'uuid'

class OssUploadUtils {
  constructor(app, callback = {}) {
    this.app = app // vue实例
    this.client = null // ossClient
    this.baseFileUrl = '' // 文件上传根路径
    this.callback = callback
    this.fileList = [] // 上传文件列表
  }

  // 初始化oss client实例
  async initOssClient() {
    try {
      const res = await this.app.$http.api.fetchOssInit()
      if (res.code) return
      const { accessKeyId, securityToken, bucket, accessKeySecret } = res.data
      const config = {
        // 以华东1（杭州）为例，Region填写为oss-cn-hangzhou。
        region: 'oss-cn-shenzhen',
        accessKeyId,
        accessKeySecret,
        stsToken: securityToken,
        bucket,
      }
      this.client = new OSS(config)
      this.baseFileUrl = `https://${config.bucket}.${config.region}.aliyuncs.com/`

      setInterval(() => {
        this.initOssClient()
      }, 1000 * 60 * 60)
      return res
    } catch (error) {
      return error
    }
  }

  // 取消上传
  abortMultipartUpload(abortCheckpoint) {
    this.client.abortMultipartUpload(
      abortCheckpoint.name,
      abortCheckpoint.uploadId
    )
  }

  // 上传文件
  async multipartUpload(rawFile) {
    if (!this.client) {
      await this.initOssClient()
    }
    if (rawFile.status > -1) return
    try {
      // 指定上传到examplebucket的Object名称，例如exampleobject.txt。
      rawFile.bucketName = this.generateFileName(rawFile)
      // 分片上传
      const res = await this.client.multipartUpload(
        rawFile.bucketName,
        rawFile.file,
        {
          // 获取分片上传进度、断点和返回值。
          progress: (p, cpt, res) => {
            this.onProgress(p, cpt, res, rawFile)
          },
          // 设置并发上传的分片数量。
          parallel: 10,
          // 设置分片大小。默认值为1 MB，最小值为100 KB。
          partSize: 1024 * 1024,
          // 文件类型
          mime: rawFile.file.type,
          headers: {
            // 指定初始化分片上传时是否覆盖同名Object。此处设置为true，表示禁止覆盖同名Object。
            'x-oss-forbid-overwrite': 'true',
          },
        }
      )
      this.onSuccess(res, rawFile)
    } catch (err) {
      this.onFaild(err, rawFile)
      console.log(err)
    }
  }

  // 上传文件
  upload(file) {
    const rawfile = this.generateRawfile(file)
    this.fileList.push(rawfile)
    this.multipartUpload(rawfile)
  }

  // 上传多个文件
  uploadAll(fileList) {
    fileList.forEach((file) => {
      const rawFile = this.generateRawfile(file)
      this.fileList.push(rawFile)
      this.multipartUpload(rawFile)
    })
  }

  // 监听上传进度
  onProgress(p, cpt, res, rawFile) {
    rawFile.status = 2
    rawFile.percentage = Math.ceil(p * 100)
    rawFile.checkpoint = cpt
    rawFile.response = res
    this.callback.progress && this.callback.progress(rawFile, this.fileList)
  }

  // 监听上传成功
  onSuccess(response, rawFile) {
    rawFile.status = 1
    rawFile.response = response
    rawFile.url = this.baseFileUrl + response.name
    this.callback.success && this.callback.success(rawFile, this.fileList)
  }

  // 监听上传失败
  onFaild(error, rawFile) {
    rawFile.response = error
    rawFile.status = 0
    this.callback.faild && this.callback.faild(rawFile, this.fileList)
  }

  // 处理上传文件名称
  generateFileName(rawfile) {
    const upload_dir = process.env.UPLOAD_DIR
    const name =
      upload_dir +
      rawfile.name.replace(/([^\\/]+)\.([^\\/]+)/i, (match, $1, $2) => {
        const lastName = rawfile.uuid + '.' + $2
        return lastName
      })
    return name
  }

  // 处理文件字段信息
  generateRawfile(file) {
    return {
      uuid: uuidv4(),
      name: file.name,
      file: file,
      percentage: 0,
      status: -1, // 0 上次失败 1 上传成功 2 上传中 -1 待上传
      url: '',
      response: null,
      checkpoint: null,
    }
  }
}

export default OssUploadUtils