<template>
  <div class="banner" v-loading="loading">
    <div class="head">
      <el-button @click="add" plain type="success">新增banner</el-button>
    </div>
    <el-table
      :data="bannerList"
      style="width: 100%">
      <el-table-column
        prop="id"
        label="ID">
      </el-table-column>
      <el-table-column
        prop="title"
        label="标题">
      </el-table-column>
      <el-table-column
        prop="url"
        label="图片">
        <template slot-scope="scope">
          <a :href="scope.row.url" target="_blank">
            <img class="short-banner" :src="scope.row.url"/>
          </a>
        </template>
      </el-table-column>
      <el-table-column
        prop="link"
        label="链接">
      </el-table-column>
      <el-table-column
        label="操作"
        width="100">
        <template slot-scope="scope">
          <el-popover
            placement="top"
            width="280">
            <div style="text-align: center">
              <el-button size="mini" plain type="primary" @click="edit(scope.row)">
                编辑
              </el-button>
              <el-button size="mini" type="danger" plain @click="del(scope.row)">
                删除
              </el-button>
              <el-button v-if="scope.$index > 0" size="mini" type="primary" plain @click="moveUp(scope.$index)">
                上移
              </el-button>
              <el-button v-if="scope.$index !== bannerList.length - 1" size="mini" type="primary" plain @click="moveDown(scope.$index)">
                下移
              </el-button>
            </div>
            <el-button slot="reference" size="mini" type="text" >操作</el-button>
          </el-popover>
        </template>
      </el-table-column>
    </el-table>
    <el-dialog
      :title="dialog.title"
      center
      append-to-body
      :visible.sync="dialog.show"
      width="30%">
      <el-form ref="form" :rules="dialog.rules" :model="dialog.form" label-width="100px">
        <el-form-item label="banner名称" prop="title">
          <el-input v-model="dialog.form.title"></el-input>
        </el-form-item>
        <el-form-item label="banner链接" prop="link">
          <el-input v-model="dialog.form.link"></el-input>
        </el-form-item>
        <div class="upload-block">
          <el-upload
            action="/api/public/upload"
            :class="{disabled:!uploadShow}"
            :before-upload="beforeAvatarUpload"
            list-type="picture-card"
            :file-list="imageList"
            :on-success="handleAvatarSuccess"
            :on-remove="handleRemove">
            <i class="el-icon-plus"></i>
          </el-upload>
        </div>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialog.show = false">取 消</el-button>
        <el-button type="primary" @click="sub">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  import {getBannerListApi,addBannerApi,editBannerApi,getBannerDetailApi,delBannerApi,moveApi} from "../../service/api";
  export default {
    name: "banner",
    data(){
      return {
        loading: false,
        bannerList: [],
        total: 0,
        uploadShow: true,
        limit: 1,
        dialog:{
          title:'新增Banner',
          show:false,
          rules: {
            title: [
              {required: true, message: '请填写Banner名称', trigger: 'change'},
            ],
            link: [
              {required: true, message: '请填写Banner链接', trigger: 'change'},
            ]
          },
          form:{
            title:'',
            url:'',
            link:'',
            id: ''
          }
        },
        imageList: []
      }
    },
    created(){
      this.getList()
    },
    methods: {
      getList(){
        this.loading = true;
        getBannerListApi().then(res=>{
          if (res) {
            this.bannerList = res.list;
            this.total = res.total;
            this.loading = false;
          }
        })
      },
      edit(data){
        this.dialog.form.id = data.id;
        this.dialog.title = '编辑Banner';
        getBannerDetailApi(data.id).then((res)=>{
          this.dialog.form.title = res.title
          this.dialog.form.link = res.link
          this.imageList = [{name:res.url,url:res.url}]
          this.dialog.show = true;
          this.uploadShow = false;
        })
      },
      add(){
        this.dialog.show = true;
        this.dialog.form.id = '';
        this.dialog.title = '新增Banner';
        this.dialog.form.title = ''
        this.dialog.form.link = '';
        this.imageList = [];
        this.uploadShow = true;
      },
      del(data){
        this.$confirm('此操作将删除该Banner?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          delBannerApi(data.id).then(res=>{
            this.$message({
              type: 'success',
              message: '删除成功!'
            });
            this.getList()
          });
        });
      },
      handleAvatarSuccess(res) {
        this.imageList = [{name:res.data.url,url:process.env.IMAGE_URL_HEAD + res.data.url}]
        this.dialog.form.url = process.env.IMAGE_URL_HEAD + res.data.url
      },
      beforeAvatarUpload(){
        this.uploadShow = false
      },
      handleRemove(){
        this.uploadShow = true
      },
      sub(){
        this.$refs['form'].validate((valid) => {
          if(valid){
            let dia = this.dialog;
            if(dia.form.id){
              let json = {
                title:dia.form.title,
                link:dia.form.link
              };
              if (this.imageList.length > 0) {
                  json.url = this.imageList[0].url
              }
              editBannerApi(dia.form.id,json).then(()=>{
                this.$message({
                  type: 'success',
                  message: '修改成功!'
                });
                dia.show = false;
                this.getList()
              })
            }else{
              let json = {
                title:dia.form.title,
                link:dia.form.link
              };
              if (this.imageList.length > 0) {
                json.url = this.imageList[0].url
              }
              addBannerApi(json).then(()=>{
                this.$message({
                  type: 'success',
                  message: '添加成功!'
                });
                dia.show = false;
                this.getList()
              })
            }
          }
        })
      },
      moveUp(index){
        let list = this.bannerList;
        this.sort(list[index].id,list[index-1].id);
      },
      moveDown(index){
        let list = this.bannerList;
        this.sort(list[index + 1].id,list[index].id);
      },
      sort(upId, downId){
        this.loading = true;
        moveApi(upId,downId).then(()=>{
          this.loading = false;
          this.getList();
        })
      }
    }
  }
</script>
<style @scoped lang="less">
  .banner{
    .head{
      padding: 5px;
    }
    width: 100%;
    padding: 10px;
    .page-div{
      text-align: center;
      padding-top: 20px
    }
  }
  .short-banner {
    width: 50px;
  }
</style>
<style>
  .disabled .el-upload--picture-card {
    display: none !important;
  }
</style>