<template>
  <el-upload
    class="avatar-uploader"
    :action="uploadUrl"
    :http-request="uploadSumit"
    :show-file-list="false"
    :on-success="handleAvatarSuccess"
    :before-upload="beforeAvatarUpload"
  >
    <img v-if="currentValue" :src="currentValue" class="avatar">
    <i v-else class="el-icon-plus avatar-uploader-icon"></i>
    <div class="el-upload__tip" slot="tip" :class="{error:tipsError}">{{tips}}</div>
  </el-upload>
</template>

<script>
import { request } from "@/api/fetch-api.js";

/**
 * 外层插件可通过监听：v-on:before-upload；v-on:after-upload两个事件监听上传结果
 * after-upload(success, src)
 */

export default {
  props: ["value"],
  data() {
    return {
      imageUrl: this.value,
      uploadUrl: "https://api.k.wxpai.cn/bizproxy/kdapi/file/upload",
      tips: "只能上传jpg/png文件，且不超过2MB",
      tipsError: false,
      uploadInterval: 0
    };
  },
  methods: {
    handleAvatarSuccess(res, file) {
      this.imageUrl = URL.createObjectURL(file.raw);
    },
    beforeAvatarUpload(file) {
      const isJPG = file.type === "image/jpeg" || file.type === "image/png";
      const isLt2M = file.size / 1024 < 2000;

      if (!isJPG) {
        this.tipsError = true;
        this.tips = "上传图片只能是 JPG|PNG 格式!";
        // this.$message.error("");
      }
      if (!isLt2M) {
        this.tipsError = true;
        this.tips = "上传图片大小不能超过 2MB!";
      }

      return isJPG && isLt2M;
    },
    uploadSumit(params) {
      this.tipsError = false;
      this.uploadStart();
      this.$emit("before-upload");

      let data = {
        path: "/pro/tianbao",
        file: params.file
      };
      request
        .form(this.uploadUrl, data)
        .then(result => {
          this.uploadEnd();
          this.imageUrl = result.content;
          this.$emit("input", this.imageUrl);
          this.$emit("after-upload", { success: true, src: this.imageUrl });
        })
        .catch(res => {
          this.uploadEnd();
          this.$emit("after-upload", { success: false, src: this.imageUrl });
        });
    },
    uploadStart() {
      let that = this;
      let times = 0;
      this.uploadInterval = setInterval(function() {
        times++;
        let t = times % 4;
        let s = "";
        for (let i = 0; i < t; i++) {
          s += ".";
        }
        that.tips = "上传中" + s;
      }, 500);
    },
    uploadEnd() {
      clearInterval(this.uploadInterval);
      this.tips = "只能上传jpg/png文件，且不超过2MB";
    }
  },
  computed: {
    currentValue: function() {
      return this.value;
    }
  }
};
</script>

<style>
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  padding: 10px;
}
.avatar-uploader .el-upload:hover {
  border-color: #409eff;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 120px;
  height: 120px;
  line-height: 120px;
  text-align: center;
}
.avatar {
  max-width: 120px;
  max-height: 120px;
  display: block;
}
.error {
  color: red;
}
</style>