<template>
  <div>
    <!-- 导入对话框 -->
    <el-dialog :title="upload.title" :visible.sync="upload.open" width="400px" append-to-body>
      <el-upload
        ref="upload"
        :limit="1"
        accept=".xlsx, .xls"
        :headers="upload.headers"
        :action="upload.url + '?updateSupport=' + upload.updateSupport"
        :disabled="upload.isUploading"
        :on-progress="handleFileUploadProgress"
        :on-success="handleFileSuccess"
        :auto-upload="false"
        drag
      >
        <i class="el-icon-upload"></i>
        <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
        <div class="el-upload__tip text-center" slot="tip">
          <div class="el-upload__tip" slot="tip">
            <el-checkbox v-model="upload.updateSupport" />是否更新已经存在的数据
          </div>
          <span>仅允许导入xls、xlsx格式文件。</span>
          <el-link
            type="primary"
            :underline="false"
            style="font-size: 12px; vertical-align: baseline"
            @click="importTemplate"
          >下载模板</el-link>
        </div>
      </el-upload>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitFileForm">确 定</el-button>
        <el-button @click="upload.open = false">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth"

export default {
  name: "ImportExcel",
  props: {
    // 导入标题
    title: {
      type: String,
      default: "导入数据"
    },
    // 导入接口地址
    importUrl: {
      type: String,
      required: true
    },
    // 模板下载地址
    templateUrl: {
      type: String,
      required: true
    },
    // 模板文件名前缀
    templateName: {
      type: String,
      default: "template"
    }
  },
  data() {
    return {
      // 导入参数
      upload: {
        // 是否显示弹出层（导入）
        open: false,
        // 弹出层标题（导入）
        title: "",
        // 是否禁用上传
        isUploading: false,
        // 是否更新已经存在的数据
        updateSupport: 0,
        // 设置上传的请求头部
        headers: { Authorization: "Bearer " + getToken() },
        // 上传的地址
        url: ""
      }
    }
  },
  methods: {
    /** 打开导入对话框 */
    show() {
      this.upload.title = this.title
      this.upload.url = process.env.VUE_APP_BASE_API + this.importUrl
      this.upload.open = true
    },
    /** 下载模板操作 */
    importTemplate() {
      this.download(this.templateUrl, {}, `${this.templateName}_${new Date().getTime()}.xlsx`)
    },
    // 文件上传中处理
    handleFileUploadProgress(event, file, fileList) {
      this.upload.isUploading = true
    },
    // 文件上传成功处理
    handleFileSuccess(response, file, fileList) {
      this.upload.open = false
      this.upload.isUploading = false
      this.$refs.upload.clearFiles()
      this.$alert(
        "<div style='overflow: auto;overflow-x: hidden;max-height: 70vh;padding: 10px 20px 0;'>" +
          response.msg +
          "</div>",
        "导入结果",
        { dangerouslyUseHTMLString: true }
      )
      // 触发父组件的成功回调
      this.$emit("success")
    },
    // 提交上传文件
    submitFileForm() {
      const file = this.$refs.upload.uploadFiles
      if (
        !file ||
        file.length === 0 ||
        (!file[0].name.toLowerCase().endsWith(".xls") &&
          !file[0].name.toLowerCase().endsWith(".xlsx"))
      ) {
        this.$modal.msgError("请选择后缀为 “xls”或“xlsx”的文件。")
        return
      }
      this.$refs.upload.submit()
    }
  }
}
</script>

<style scoped>
</style>