<template>
  <div>
    <img v-bind:src="options.img" @click="editCropper()" title="点击上传头像" class="img-circle img-lg" />
    <el-dialog :title="title" :visible.sync="open" width="800px" append-to-body>
      <el-row>
        <el-col :xs="24" :md="12" :style="{height: '350px'}">
          <vue-cropper
            ref="cropper"
            :img="options.img"
            :info="true"
            :autoCrop="options.autoCrop"
            :autoCropWidth="options.autoCropWidth"
            :autoCropHeight="options.autoCropHeight"
            :fixedBox="options.fixedBox"
            @realTime="realTime"
          />
        </el-col>
        <el-col :xs="24" :md="12" :style="{height: '350px'}">
          <div class="avatar-upload-preview">
            <img :src="previews.url" :style="previews.img" />
          </div>
        </el-col>
      </el-row>
      <br />
      <el-row>
        <el-col :lg="2" :md="2">
          <el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
            <el-button size="small">
              上传
              <i class="el-icon-upload el-icon--right"></i>
            </el-button>
          </el-upload>
        </el-col>
        <el-col :lg="{span: 1, offset: 2}" :md="2">
          <el-button icon="el-icon-plus" size="small" @click="changeScale(1)"></el-button>
        </el-col>
        <el-col :lg="{span: 1, offset: 1}" :md="2">
          <el-button icon="el-icon-minus" size="small" @click="changeScale(-1)"></el-button>
        </el-col>
        <el-col :lg="{span: 1, offset: 1}" :md="2">
          <el-button icon="el-icon-refresh-left" size="small" @click="rotateLeft()"></el-button>
        </el-col>
        <el-col :lg="{span: 1, offset: 1}" :md="2">
          <el-button icon="el-icon-refresh-right" size="small" @click="rotateRight()"></el-button>
        </el-col>
        <el-col :lg="{span: 2, offset: 6}" :md="2">
          <el-button type="primary" size="small" @click="uploadImg()">提 交</el-button>
        </el-col>
      </el-row>
    </el-dialog>
  </div>
</template>

<script>
import store from "@/store";
import { VueCropper } from "vue-cropper";
import { uploadAvatar} from "@/api/system/user";

export default {
  components: { VueCropper },
  props: {
    user: {
      type: Object
    }
  },
  data() {
    return {
      // 是否显示弹出层
      open: false,
      // 弹出层标题
      title: "修改头像",
      options: {
        img: store.getters.avatar, //裁剪图片的地址
        img: "",
        autoCrop: true, // 是否默认生成截图框
        autoCropWidth: 200, // 默认生成截图框宽度
        autoCropHeight: 200, // 默认生成截图框高度
        fixedBox: true // 固定截图框大小 不允许改变
      },
      previews: {}
    };
  },
  methods: {
    // 编辑头像
    editCropper() {
      this.open = true;
    },
    // 覆盖默认的上传行为
    requestUpload() {
    },
    // 向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    // 向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    // 图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    // 上传预处理
    beforeUpload(file) {
      if (file.type.indexOf("image/") == -1) {
        this.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。");
      } else {
        const reader = new FileReader();
        reader.readAsDataURL(file);
        reader.onload = () => {
          this.options.img = reader.result;
        };
      }
    },
    // 上传图片
    uploadImg() {
      this.$refs.cropper.getCropBlob(data => {
  
        var type = data.type
        var types = {
          "image/jpeg":"jpeg",
          "image/png":"png"
        }
        var file_name = "temp.jpg"
        if (types[type]){
          file_name = "temp." + types[type]
        }
        let formData = new FormData();
        formData.append("avatarfile", data,file_name);
        uploadAvatar(formData).then(response => {
          if (response.code === 0) {
            this.open = false;
            this.options.img = process.env.VUE_APP_BASE_API +"/"+ response.data.fileInfo.fileUrl;
            
            this.msgSuccess("修改成功");
          } else {
            this.msgError(response.msg);
          }
          this.$refs.cropper.clearCrop();
        });
      });
    },
    // 实时预览
    realTime(data) {
      this.previews = data;
    },
    // 设置头像base64
    setAvatarBase64(src, callback) {
      let _this = this;
      let image = new Image();
      // 处理缓存
      image.src = src + '?v=' + Math.random();
      // 支持跨域图片
      image.crossOrigin = "*";
      image.onload = function () {
        let base64 = _this.transBase64FromImage(image);
        callback && callback(base64);
      }
    },
    // 将网络图片转换成base64格式
    transBase64FromImage(image) {
      let canvas = document.createElement("canvas");
      canvas.width = image.width;
      canvas.height = image.height;
      let ctx = canvas.getContext("2d");
      ctx.drawImage(image, 0, 0, image.width, image.height);
      // 可选其他值 image/jpeg
      return canvas.toDataURL("image/png");
    }
  },
  watch:{
    user:function(val){
      if (val.avatar) {        
        this.setAvatarBase64(process.env.VUE_APP_BASE_API + "/"+ val.avatar, (base64) => {
          this.options.img =  base64;
        });
      }
    }
  }
}
</script>