<!-- plupload封装 -->
<template>
	<div class="supload">
    <div class="clearfix list-picture" v-if="fileList.length>0&&listType=='picture'">
        <div v-for="ff,index in fileList" class="pic-bx small">
            <img :src="ff.showUrl">
            <div class="cl-bx">
                <i class="el-icon-close" @click="deleteFile(ff,index)"></i>
            </div>
        </div>
    </div>
    <div class="plupload clearfix" v-show="fileList.length<maxFile">
    	<template v-if="listType=='text'">
    		<div class="text_trigger">
	    		<div :id="trigger_id" >
	    			<i class="el-icon-document" ></i>
	    			<span>{{triggerText}}(小于{{maxSize}}Mb)</span>
	    		</div>
    		</div>
    	</template>
	    <template v-if="listType=='picture'">
    		<div class="fm-up" :id="trigger_id">
          <div class="cc">
            <i class="el-icon-circle-plus-outline"></i>
            <p>点击选择</p>
            <span>支持jpg/png格式</span>
            <span>560px×400px</span>
            
          </div>
        </div>
	    </template>
    </div>
    <div class="pgs" v-if="progress>0&&listType=='text'">
    	<el-progress :text-inside="true" :stroke-width="20" :percentage="progress" status="success"></el-progress>
    </div>
	
    <div class="list-text" v-if="listType=='text'">
	    <template v-for="ff,index in fileList">
	    	<div class="clearfix item-text">
	    		<!-- <div class="progress" :style="{'width':ff.progress+'%'}"></div> -->
	    		<div class="title">{{ff.name}}</div>
	    		<div class="close" @click="deleteFile(ff,index)">删除</div>
	    	</div>
	    	
			  </template>
    </div>
    
	</div>
</template>

<script>
/** 
 *  强制multi_selection为false使其只能逐个上传
 *    
 */
/** 
 *  tip:
 *  为了操作方便fileList以数组形式传入props，直接操作fileList可以实现数据双向绑定
 *  并不建议这样去做，父子组件之间尽量保持单向数据流
 *  因此可以暂不向外提供文件删除上传的回调入口
 */
 /*
	xlsx等文档可以在拓展过滤为zip的情况下可选的bug是因为xlsx本质是个压缩包，将xlsx拓展名改成zip再看看
 */
import plupload from 'plupload'  
import {guid,getExtName} from '../../lib/util.js'

import config from '../../config/config.js'
export default {
  data() {
    return {
				trigger_id:null, //触发按钮的ID属性
				plup:null, // plupload实例对象
				progress: 0,  // 单文件上传进度  
				option: null
    };
  },
  props: { 
    accept: {
    	type: String,
    	default: 'image/png,image/jpeg,audio/mp3'
    },
    // 支持的拓展名以逗号隔开jpg,gif,png,bmp,mp4
    extensions:{
    	type: String,
    	default: 'mp4'
    },
    maxFile: {
       type: Number,
       default: 1
    },
    maxSize: {
       type: Number,
       default: 512 //mb
    },
    // 文件列表
    fileList: {
    	default(){
    		return []
    	}
    },
    // text,picture 以picture形式呈现时，如果超过可上传数量，上传界面将消失
    listType:{
    	default: 'text'
    },
    params:{
    	type:Object,
    	required:true
    },
    triggerText:{
      default:'选择文件'
    }
  },
  computed:{
    
  },
  components: {

  },  
        
  methods: {
    transGetUrl(url) {
            return config.imgHost + url
        },


  	deleteFile(ff,index){
  		this.fileList.splice(index,1)
  	},
  
  },
  watch:{
  	extensions(ne,olg){
  		this.option.filters.mime_types=[{
  			title: 'files', extensions: ne
  		}]
  		
  		this.plup.destroy()
  		this.plup = new plupload.Uploader(this.option);
  		this.plup.init()

  	}

  },
  mounted(){
    const $this = this;
    this.option = {
      runtimes: 'html5,flash,silverlight,html4',
      url: config.downloadHost+'upload/pluploadUpload',
      //url: '/preschool/upload/pluploadUpload',
      browse_button: this.trigger_id,
      chunk_size: '2048kb',
      multi_selection:false,
      filters: {
        mime_types: [{ title: 'files', extensions: this.extensions }],
        max_file_size: this.maxSize+'mb',
        prevent_duplicates: true
      },
      multipart:true,
      multipart_params:this.params,
      init: {
        FilesAdded: function(up, files) {
          up.start();
        },
        UploadProgress: function(up, file) {
					$this.progress = file.percent;
				},
		BeforeUpload: function(up,file) {},
        FileUploaded: function(uploader,file,res){
        	// response,responseHeaders,status
          if (res.status==200){
            let result = JSON.parse(res.response);
            if (result.code==0){
            	setTimeout(function(){
              	$this.progress = 0;
    	          $this.fileList.push({
    	        		name:file.name,
    	        		// url: result.data.replace(/(.*)(pluploadDir)/g,config.imgHost),
                  url: result.data,
                  showUrl: $this.transGetUrl(result.data),
                  type: getExtName(result.data)  
    	        	});
            	},500);
            }
          } else {
          }
        },
        Error:function(up,err){},
        Refresh: function(up){},
        Destroy(up){},
        OptionChanged:function(up,option_name,new_value,old_value){}
        // Error: this.error
      }
  	}
    this.plup = new plupload.Uploader(this.option);
  	this.plup.init();
  },
  beforeMount(){
  	this.trigger_id = guid();
  }
};
/**
 * 额外参数传递：
 * 1.设置multipart为true
 * 为true时将以multipart/form-data的形式来上传文件，为false时则以二进制的格式来上传文件。
 * 2. 设置multipart_params:{userId:1024}
 * 方式二
 * 设置init的BeforeUpload(up,file){up.setOption("multipart_params",{userId:1024})}
 * 也可以up.setOption({'multipart_params':{userId:1030}});这样可以方便设置多个参数
 * 像 up.setOption({'multipart':true,'multipart_params':{userId:1032}})
 * 在某些情况下可能更方便
 */
</script>