<template>
  <div>
    <el-upload
      action="http://xjs-cloud.oss-cn-hangzhou.aliyuncs.com"
      :data="dataObj"
      list-type="picture-card"
      :file-list="fileList"
      :before-upload="beforeUpload"
      :on-remove="handleRemove"
      :on-success="handleUploadSuccess"
      :on-preview="handlePreview"
      :before-remove="removeImg"
      :limit="maxCount"
      accept="image/*"
      :on-exceed="handleExceed"
    >
      <i class="el-icon-plus"></i>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="dialogImageUrl" alt />
    </el-dialog>
  </div>
</template>
<script>
import {policy, removeImg} from "@/api/common";
import { getUUID } from '@/utils'
export default {
  name: "multiUpload",
  props: {
    //图片属性数组
    value: Array,
    //最大上传图片数量
    maxCount: {
      type: Number,
      default: 30
    }
  },
  data() {
    return {
      dataObj: {
        policy: "",
        signature: "",
        key: "",
        ossaccessKeyId: "",
        dir: "",
        host: "",
        uuid: ""
      },
      dialogVisible: false,
      dialogImageUrl: null
    };
  },
  computed: {
    fileList() {
      let fileList = [];
      for (let i = 0; i < this.value.length; i++) {
        fileList.push({ url: this.value[i] });
      }

      return fileList;
    }
  },
  mounted() {},
  methods: {
    emitInput(fileList) {
      let value = [];
      for (let i = 0; i < fileList.length; i++) {
        value.push(fileList[i].url);
      }
      this.$emit("input", value);
    },
    handleRemove(file, fileList) {
      this.emitInput(fileList);
    },
    handlePreview(file) {
      this.dialogVisible = true;
      this.dialogImageUrl = file.url;
    },

    beforeUpload(file) {
      let _self = this;
      return new Promise((resolve, reject) => {
        let isRightSize = file.size / 1024 / 1024 < 10
        if (!isRightSize) {
          this.$message.error('文件大小超过 10MB')
        }
        let isAccept = new RegExp('image/*').test(file.type)
        if (!isAccept) {
          this.$message.error('应该选择image/*类型的文件')
        }

        if (isRightSize && isAccept) {
          policy()
            .then(response => {
              _self.dataObj.policy = response.data.policy;
              _self.dataObj.signature = response.data.signature;
              _self.dataObj.ossaccessKeyId = response.data.accessid;
              _self.dataObj.key = response.data.dir + "/"+getUUID()+"_${filename}";
              _self.dataObj.dir = response.data.dir;
              _self.dataObj.host = response.data.host;
              resolve(true);
            })
            .catch(err => {
              console.log("出错了...",err)
              reject(false);
            });
        }else {
          reject(false);
        }

      });
    },



    handleUploadSuccess(res, file) {
      this.fileList.push({
        name: file.name,
        // url: this.dataObj.host + "/" + this.dataObj.dir + "/" + file.name； 替换${filename}为真正的文件名
        url: this.dataObj.host + "/" + this.dataObj.key.replace("${filename}",file.name)
      });
      this.emitInput(this.fileList);
    },
    handleExceed(files, fileList) {
      this.$message({
        message: "最多只能上传" + this.maxCount + "张图片",
        type: "warning",
        duration: 1000
      });
    },

    //删除图片
    removeImg(file,fileList) {
      if (file.url) {
        let pictureUrl = {"url": file.url};
        removeImg(pictureUrl).then(res => {
        })
        this.emitInput('');
      }
    },
  }
};
</script>
<style>
</style>


