<template>
  <div class="dropzone-wrapper dataset-files">
    <div
      id="dataset"
      class="dropzone"
    />
    <p class="upload-info">
      {{ file_status_text }}
      <span class="success">{{ status }}</span>
    </p>
  </div>
</template>

<script>
/* eslint-disable eqeqeq */
// import Dropzone from 'dropzone/dist/dropzone.js';
// import 'dropzone/dist/dropzone.css'
import SparkMD5 from 'spark-md5';
import axios from 'axios';
import qs from 'qs';
import createDropzone from '../features/dropzone.js';

const {_AppSubUrl, _StaticUrlPrefix, csrf} = window.config;
const CloudBrainType = 0;

export default {
  data() {
    return {
      dropzoneUploader: null,
      maxFiles: 1,
      maxFilesize: 1 * 1024 * 1024 * 1024 * 1024,
      acceptedFiles: '*/*',
      progress: 0,
      status: '',
      dropzoneParams: {},
      file_status_text: ''
    };
  },

  async mounted() {
    this.dropzoneParams = $('div#minioUploader-params');
    this.file_status_text = this.dropzoneParams.data('file-status');
    this.status = this.dropzoneParams.data('file-init-status');

    let previewTemplate = '';
    previewTemplate += '<div class="dz-preview dz-file-preview">\n ';
    previewTemplate += '    <div class="dz-details">\n ';
    previewTemplate += '        <div class="dz-filename">';
    previewTemplate +=
      '            <span data-dz-name data-dz-thumbnail></span>';
    previewTemplate += '        </div>\n    ';
    previewTemplate += '        <div class="dz-size" data-dz-size></div>\n  ';
    previewTemplate += '    </div>\n  ';
    previewTemplate += '    <div class="dz-progress ui active progress">';
    previewTemplate +=
      '        <div class="dz-upload bar" data-dz-uploadprogress><div class="progress"></div></div>\n  ';
    previewTemplate += '    </div>\n  ';
    previewTemplate += '    <div class="dz-success-mark">';
    previewTemplate += '        <span>上传成功</span>';
    previewTemplate += '    </div>\n  ';
    previewTemplate += '    <div class="dz-error-mark">';
    previewTemplate += '        <span>上传失败</span>';
    previewTemplate += '    </div>\n  ';
    previewTemplate += '    <div class="dz-error-message">';
    previewTemplate += '        <span data-dz-errormessage></span>';
    previewTemplate += '    </div>\n';
    previewTemplate += '</div>';

    const $dropzone = $('div#dataset');
    console.log('createDropzone');
    const dropzoneUploader = await createDropzone($dropzone[0], {
      url: '/todouploader',
      maxFiles: this.maxFiles,
      maxFilesize: this.maxFileSize,
      timeout: 0,
      autoQueue: false,
      dictDefaultMessage: this.dropzoneParams.data('default-message'),
      dictInvalidFileType: this.dropzoneParams.data('invalid-input-type'),
      dictFileTooBig: this.dropzoneParams.data('file-too-big'),
      dictRemoveFile: this.dropzoneParams.data('remove-file'),
      previewTemplate
    });
    dropzoneUploader.on('addedfile', (file) => {
      setTimeout(() => {
        // eslint-disable-next-line no-unused-expressions
        file.accepted && this.onFileAdded(file);
      }, 200);
    });
    dropzoneUploader.on('maxfilesexceeded', function (file) {
      if (this.files[0].status !== 'success') {
        alert(this.dropzoneParams.data('waitting-uploading'));
        this.removeFile(file);
        return;
      }
      this.removeAllFiles();
      this.addFile(file);
    });

    this.dropzoneUploader = dropzoneUploader;
  },
  methods: {
    resetStatus() {
      this.progress = 0;
      this.status = '';
    },
    updateProgress(file, progress) {
      file.previewTemplate.querySelector(
        '.dz-upload'
      ).style.width = `${progress}%`;
    },
    emitDropzoneSuccess(file) {
      file.status = 'success';
      this.dropzoneUploader.emit('success', file);
      this.dropzoneUploader.emit('complete', file);
    },
    emitDropzoneFailed(file) {
      this.status = this.dropzoneParams.data('falied');
      file.status = 'error';
      this.dropzoneUploader.emit('error', file);
      // this.dropzoneUploader.emit('complete', file);
    },
    onFileAdded(file) {
      file.datasetId = document
        .getElementById('datasetId')
        .getAttribute('datasetId');
      this.resetStatus();
      this.computeMD5(file);
    },

    finishUpload(file) {
      this.emitDropzoneSuccess(file);
      setTimeout(() => {
        window.location.reload();
      }, 1000);
    },

    computeMD5(file) {
      this.resetStatus();
      const blobSlice =
          File.prototype.slice ||
          File.prototype.mozSlice ||
          File.prototype.webkitSlice,
        chunkSize = 1024 * 1024 * 64,
        chunks = Math.ceil(file.size / chunkSize),
        spark = new SparkMD5.ArrayBuffer(),
        fileReader = new FileReader();
      let currentChunk = 0;

      const time = new Date().getTime();
      // console.log('计算MD5...')
      this.status = this.dropzoneParams.data('md5-computing');
      file.totalChunkCounts = chunks;
      loadNext();

      fileReader.onload = (e) => {
        fileLoaded.call(this, e);
      };
      fileReader.onerror = (err) => {
        console.warn('oops, something went wrong.', err);
        file.cancel();
      };

      function fileLoaded(e) {
        spark.append(e.target.result); // Append array buffer
        currentChunk++;
        if (currentChunk < chunks) {
          // console.log(`第${currentChunk}分片解析完成, 开始第${currentChunk +1}/${chunks}分片解析`);
          this.status = `${this.dropzoneParams.data('loading-file')} ${(
            (currentChunk / chunks) *
            100
          ).toFixed(2)}% (${currentChunk}/${chunks})`;
          this.updateProgress(file, ((currentChunk / chunks) * 100).toFixed(2));
          loadNext();
          return;
        }

        const md5 = spark.end();
        console.log(
          `MD5计算完成：${file.name} \nMD5：${md5} \n分片：${chunks} 大小:${
            file.size
          } 用时：${(new Date().getTime() - time) / 1000} s`
        );
        spark.destroy(); // 释放缓存
        file.uniqueIdentifier = md5; // 将文件md5赋值给文件唯一标识
        file.cmd5 = false; // 取消计算md5状态
        this.computeMD5Success(file);
      }

      function loadNext() {
        const start = currentChunk * chunkSize;
        const end =
          start + chunkSize >= file.size ? file.size : start + chunkSize;
        fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));
      }
    },

    async computeMD5Success(md5edFile) {
      const file = await this.getSuccessChunks(md5edFile);
      try {
        if (file.uploadID == '' || file.uuid == '') {
        // 未上传过
          await this.newMultiUpload(file);
          if (file.uploadID != '' && file.uuid != '') {
            file.chunks = '';
            this.multipartUpload(file);
          } else {
          // 失败如何处理
            return;
          }
          return;
        }

        if (file.uploaded == '1') {
        // 已上传成功
        // 秒传
          if (file.attachID == '0') {
          // 删除数据集记录，未删除文件
            await addAttachment(file);
          }
          //不同数据集上传同一个文件
          if (file.datasetID != '') {
            if (Number(file.datasetID) != file.datasetId) {
              var info = "该文件已上传，对应数据集（" + file.datasetName + "）-文件（" + file.realName + ")";
              window.alert(info);
              window.location.reload();
            }
          }
          console.log('文件已上传完成');
          this.progress = 100;
          this.status = this.dropzoneParams.data('upload-complete');
          this.finishUpload(file);
        } else {
        // 断点续传
          this.multipartUpload(file);
        }
      } catch (error) {
        this.emitDropzoneFailed(file);
        console.log(error);
      }

      async function addAttachment(file) {
        return await axios.post(
          '/attachments/add',
          qs.stringify({
            uuid: file.uuid,
            file_name: file.name,
            size: file.size,
            dataset_id: file.datasetId,
            type: CloudBrainType,
            _csrf: csrf
          })
        );
      }
    },

    async getSuccessChunks(file) {
      const params = {
        params: {
          md5: file.uniqueIdentifier,
          _csrf: csrf
        }
      };
      try {
        const response = await axios.get('/attachments/get_chunks', params);
        file.uploadID = response.data.uploadID;
        file.uuid = response.data.uuid;
        file.uploaded = response.data.uploaded;
        file.chunks = response.data.chunks;
        file.attachID = response.data.attachID;
        file.datasetID = response.data.datasetID;
        file.datasetName = response.data.datasetName;
        file.realName = response.data.fileName;
        return file;
      } catch (error) {
        this.emitDropzoneFailed(file);
        console.log('getSuccessChunks catch: ', error);
        return null;
      }
    },

    async newMultiUpload(file) {
      const res = await axios.get('/attachments/new_multipart', {
        params: {
          totalChunkCounts: file.totalChunkCounts,
          md5: file.uniqueIdentifier,
          size: file.size,
          fileType: file.type,
          type: CloudBrainType,
          _csrf: csrf
        }
      });
      file.uploadID = res.data.uploadID;
      file.uuid = res.data.uuid;
    },

    multipartUpload(file) {
      const blobSlice =
          File.prototype.slice ||
          File.prototype.mozSlice ||
          File.prototype.webkitSlice,
        chunkSize = 1024 * 1024 * 64,
        chunks = Math.ceil(file.size / chunkSize),
        fileReader = new FileReader(),
        time = new Date().getTime();
      let currentChunk = 0;

      function loadNext() {
        const start = currentChunk * chunkSize;
        const end =
          start + chunkSize >= file.size ? file.size : start + chunkSize;
        fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));
      }

      function checkSuccessChunks() {
        const index = successChunks.indexOf((currentChunk + 1).toString());
        if (index == -1) {
          return false;
        }
        return true;
      }

      async function getUploadChunkUrl(currentChunk, partSize) {
        const res = await axios.get('/attachments/get_multipart_url', {
          params: {
            uuid: file.uuid,
            uploadID: file.uploadID,
            size: partSize,
            chunkNumber: currentChunk + 1,
            type: CloudBrainType,
            _csrf: csrf
          }
        });
        urls[currentChunk] = res.data.url;
      }

      async function uploadMinio(url, e) {
        const res = await axios.put(url, e.target.result);
        etags[currentChunk] = res.headers.etag;
      }

      async function updateChunk(currentChunk) {
        await axios.post(
          '/attachments/update_chunk',
          qs.stringify({
            uuid: file.uuid,
            chunkNumber: currentChunk + 1,
            etag: etags[currentChunk],
            _csrf: csrf
          })
        );
      }
      async function uploadChunk(e) {
        try {
          if (!checkSuccessChunks()) {
            const start = currentChunk * chunkSize;
            const partSize =
            start + chunkSize >= file.size ? file.size - start : chunkSize;
            // 获取分片上传url
            await getUploadChunkUrl(currentChunk, partSize);
            if (urls[currentChunk] != '') {
            // 上传到minio
              await uploadMinio(urls[currentChunk], e);
              if (etags[currentChunk] != '') {
              // 更新数据库：分片上传结果
                //await updateChunk(currentChunk);
              } else {
                console.log("上传到minio uploadChunk etags[currentChunk] == ''");// TODO
              }
            } else {
              console.log("uploadChunk urls[currentChunk] != ''");// TODO
            }
          }
        } catch (error) {
          this.emitDropzoneFailed(file);
          console.log(error);
        }
      }

      async function completeUpload() {
        return await axios.post(
          '/attachments/complete_multipart',
          qs.stringify({
            uuid: file.uuid,
            uploadID: file.uploadID,
            file_name: file.name,
            size: file.size,
            dataset_id: file.datasetId,
            type: CloudBrainType,
            _csrf: csrf
          })
        );
      }

      const successChunks = [];
      let successParts = [];
      successParts = file.chunks.split(',');
      for (let i = 0; i < successParts.length; i++) {
        successChunks[i] = successParts[i].split('-')[0];
      }
      const urls = []; // TODO const ?
      const etags = [];
      console.log('上传分片...');
      this.status = this.dropzoneParams.data('uploading');
      loadNext();
      fileReader.onload = async (e) => {
        await uploadChunk(e);
        fileReader.abort();
        currentChunk++;
        if (currentChunk < chunks) {
          console.log(
            `第${currentChunk}个分片上传完成, 开始第${currentChunk +
              1}/${chunks}个分片上传`
          );
          this.progress = Math.ceil((currentChunk / chunks) * 100);
          this.updateProgress(file, ((currentChunk / chunks) * 100).toFixed(2));
          this.status = `${this.dropzoneParams.data('uploading')} ${(
            (currentChunk / chunks) *
            100
          ).toFixed(2)}%`;
          await loadNext();
        } else {
          await completeUpload();
          console.log(
            `文件上传完成：${file.name} \n分片：${chunks} 大小:${
              file.size
            } 用时：${(new Date().getTime() - time) / 1000} s`
          );
          this.progress = 100;
          this.status = this.dropzoneParams.data('upload-complete');
          this.finishUpload(file);
        }
      };
    }
  }
};
</script>

<style>
.dropzone-wrapper {
  margin: 2em auto;
}
.ui .dropzone {
  border: 2px dashed #0087f5;
  box-shadow: none !important;
  padding: 0;
  min-height: 5rem;
  border-radius: 4px;
}
.dataset .dataset-files #dataset .dz-preview.dz-file-preview,
.dataset .dataset-files #dataset .dz-preview.dz-processing {
  display: flex;
  align-items: center;
}
.dataset .dataset-files #dataset .dz-preview {
  border-bottom: 1px solid #dadce0;
  min-height: 0;
}
</style>