<template>
  <div class="wrap wrap-sku">
    <div class="product-box">
      <div class="product-content">
        <div class="product-delcom" v-for="(ProductItem,n) in simulatedDATA.specifications">
          <p>{{ProductItem.name}}</p>
          <ul class="product-footerlist clearfix">
            <li v-for="(oItem,index) in ProductItem.item"
              v-on:click="specificationBtn(oItem.name,n,$event,index)"
              v-bind:class="[oItem.isShow?'':'noneActive',subIndex[n] == index?'productActive':'']">
              {{oItem.name}}
            </li>
          </ul>
        </div>
        <p v-if="price" class="price">¥{{price}}</p>
      </div>
      <div class="product-footer">
        <a href="javascript:" rel="external nofollow" >立即購買</a>
      </div>
    </div>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        simulatedDATA: { //模擬后臺(tái)返回的數(shù)據(jù) 多規(guī)格
          "difference": [
            { //所有的規(guī)格可能情況都在這個(gè)數(shù)組里
              "id": "19",
              "price": "200.00",
              "stock": "19",
              "difference": "100,白色"
            },
            {
              "id": "20",
              "price": "100.00",
              "stock": "29",
              "difference": "200,白色"
            },
            {
              "id": "21",
              "price": "300.00",
              "stock": "10",
              "difference": "100,黑色"
            },
            {
              "id": "22",
              "price": "900.00",
              "stock": "0",
              "difference": "200,黑色"
            },
            {
              "id": "23",
              "price": "600.00",
              "stock": "48",
              "difference": "100,綠色"
            },
            {
              "id": "24",
              "price": "500.00",
              "stock": "40",
              "difference": "200,綠色"
            },
            {
              "id": "25",
              "price": "90.00",
              "stock": "0",
              "difference": "100,藍(lán)色"
            },
            {
              "id": "26",
              "price": "40.00",
              "stock": "20",
              "difference": "200,藍(lán)色"
            }
          ],
          "specifications": [
            { //這里是要被渲染字段
              "name": "尺寸",
              "item": [
                {
                  "name": "100",
                },
                {
                  "name": "200",
                }
              ]
            },
            {
              "name": "顏色",
              "item": [
                {
                  "name": "白色",
                },
                {
                  "name": "藍(lán)色",
                },
                {
                  "name": "黑色",
                },
                {
                  "name": "綠色",
                }
              ]
            }
          ]
        },
        selectArr: [], //存放被選中的值
        shopItemInfo: {}, //存放要和選中的值進(jìn)行匹配的數(shù)據(jù)
        subIndex: [], //是否選中 因?yàn)椴淮_定是多規(guī)格還是單規(guī)格，所以這里定義數(shù)組來判斷
        price:'' //選中規(guī)格的價(jià)錢
      }
    },
    methods: {
      specificationBtn: function (item, n, event, index) {
        var self = this;
        if (self.selectArr[n] != item) {
          self.selectArr[n] = item;
          self.subIndex[n] = index;
        } else {
          self.selectArr[n] = "";
          self.subIndex[n] = -1; //去掉選中的顏色
        }
        self.checkItem();
      },
      checkItem: function () {
        var self = this;
        var option = self.simulatedDATA.specifications;
        var result = []; //定義數(shù)組儲(chǔ)存被選中的值
        for(var i in option){
          result[i] = self.selectArr[i] ? self.selectArr[i] : '';
        }
        for (var i in option) {
          var last = result[i]; //把選中的值存放到字符串last去
          for (var k in option[i].item) {
            result[i] = option[i].item[k].name; //賦值，存在直接覆蓋，不存在往里面添加name值
            option[i].item[k].isShow = self.isMay(result); //在數(shù)據(jù)里面添加字段isShow來判斷是否可以選擇
          }
          result[i] = last; //還原，目的是記錄點(diǎn)下去那個(gè)值，避免下一次執(zhí)行循環(huán)時(shí)被覆蓋
        }
        if(this.shopItemInfo[result]){
          this.price = this.shopItemInfo[result].price || ''
        }
        self.$forceUpdate(); //重繪
      },
      isMay: function (result) {
        for (var i in result) {
          if (result[i] == '') {
            return true; //如果數(shù)組里有為空的值，那直接返回true
          }
        }
        return this.shopItemInfo[result].stock == 0 ? false : true; //匹配選中的數(shù)據(jù)的庫存，若不為空返回true反之返回false
      }
    },
    created: function () {
      var self = this;
      for (var i in self.simulatedDATA.difference) {
        self.shopItemInfo[self.simulatedDATA.difference[i].difference] = self.simulatedDATA.difference[i]; //修改數(shù)據(jù)結(jié)構(gòu)格式，改成鍵值對的方式，以方便和選中之后的值進(jìn)行匹配
      }
      self.checkItem();
    }
  }
</script>

<style lang="scss" rel="stylesheet">
  .wrap-sku {
    .product-box {
      width: 1200px;
      display: block;
      margin: 0 auto;
    }
    .product-content {
      margin-bottom: 100px;
    }
    .product-delcom {
      color: #323232;
      font-size: 26px;
      border-bottom: 1px solid #EEEEEE;
      padding: 30px 0;
    }
    .product-footerlist {
      margin-top: 10px;
    }
    .product-footerlist li {
      border: 1px solid #606060;
      border-radius: 5px;
      color: #606060;
      text-align: center;
      padding: 10px 30px;
      float: left;
      margin-right: 20px;
      cursor: pointer;
    }
    .product-footerlist li.productActive {
      background-color: #1A1A29;
      color: #fff;
      border: 1px solid #1A1A29;
    }
    .product-footerlist li.noneActive {
      background-color: #ccc;
      opacity: 0.4;
      color: #000;
      pointer-events: none;
    }
    .product-footer {
      background-color: #1A1A29;
      text-align: center;
    }
    .product-footer a {
      color: #fff;
      text-decoration: none;
      height: 88px;
      line-height: 88px;
      font-size: 28px;
    }
    .price{
      font-size: 30px;
      height: 60px;
      line-height: 60px;
    }
  }
</style>