<template>
  <div>
    <h1>vuex-shopCart</h1>
    <div class="shop-listbox">
      <shop-list/>
    </div>
    <h2>已选商品</h2>
    <div class="shop-cartbox">
      <shop-cart/>
    </div>
  </div>
</template>
<script>
  import shopList from "./shop-list";
  import shopCart from './shop-cart';
  export default{
    name:'shop',
    components:{
      'shop-list':shopList,
      'shop-cart':shopCart
    }
  }
</script>

<template>
  <div class="shop-list">
    <table>
      <tr class="shop-listtitle">
        <td>id</td>
        <td>名称</td>
        <td>价格</td>
        <td>操作</td>
      </tr>
      <tr v-for="item in shopList" class="shop-listinfo">
        <td>{{item.id}}</td>
        <td>{{item.name}}</td>
        <td>{{item.price}}</td>
        <td><button @click="addToCart(item)">加入购物车</button></td>
      </tr>
    </table>
  </div>
</template>
<script>
  import{mapActions} from "vuex";
  export default{
    name:'shopList',
    data(){
      return{
      }
    },
    computed:{
      shopList(){
        return this.$store.getters.getShopList
      }
    },
    methods:{
      ...mapActions(['addToCart'])
    }
  }
</script>
<style lang="less" scoped>
  @import url('../../static/public.less');
</style>

<template>
  <div class="shop-list">
    <table>
      <tr class="shop-listtitle">
        <td>id</td>
        <td>名称</td>
        <td>价格</td>
        <td>数量</td>
        <td>操作</td>
      </tr>
      <tr v-for="item in cartData" class="shop-listinfo">
        <td>{{item.id}}</td>
        <td>{{item.name}}</td>
        <td>{{item.price}}</td>
        <td>{{item.num}}</td>
        <td><button class="shop-dele dele-btn" @click="deletShop(item)">删除</button></td>
      </tr>
      <tr v-if="cartData.length<=0">
        <td colspan="5">暂无数据</td>
      </tr>
      <tr>
        <td colspan="2">总数：{{totalNum}}</td>
        <td colspan="2">总价格：{{totalPrice}}</td>
        <td><button class="dele-cart dele-btn" @click="clearCart">清空购物车</button></td>
      </tr>
    </table>
  </div>
</template>
<script>
  import {mapGetters,mapActions} from "vuex";
  export default{
    name:'shopCart',
    data(){
      return{
      }
    },
    computed:{
      ...mapGetters({
        cartData:'addShopList',
        totalNum:'totalNum',
        totalPrice:'totalPrice'
      })
    },
    methods:{
      ...mapActions({
        clearCart:'clearToCart',
        deletShop:'deletToShop'
      })
    }
  }
</script>
<style lang="less" scoped>
  @import url('../../static/public.less');
  .dele-btn{
    background-color: red !important;
  }
  .dele-btn:hover{
    background-color: #bd0000 !important;
  }
</style>

import Vue from "vue";
import Vuex from 'vuex';
import cart from "./modules/cart";
Vue.use(Vuex);
export default new Vuex.Store({
  modules:{
    cart
  }
})

const state = {
  shop_list: [{
    id: 11,
    name: '鱼香肉丝',
    price: 12,
  }, {
    id: 22,
    name: '宫保鸡丁',
    price: 14
  }, {
    id: 34,
    name: '土豆丝',
    price: 10
  }, {
    id: 47,
    name: '米饭',
    price: 2
  },{
    id: 49,
    name: '蚂蚁上树',
    price: 13
  },
  {
    id: 50,
    name: '腊肉炒蒜薹',
    price: 15
  }],
  add:[]
}
const getters ={
  //获取商品列表
  getShopList:state => state.shop_list,
  //获取购物车列表
  addShopList:state => {
    return state.add.map(({id,num})=>{
      let product = state.shop_list.find(n => n.id == id);
      if(product){
        return{
          ...product,
          num
        }
      }
    })
  },
  //获取总数量
  totalNum:(state,getters) =>{
    let total =0;
    getters.addShopList.map(n=>{
      total += n.num;
    })
    return total;
  },
  //计算总价格
  totalPrice:(state,getters)=>{
    let total=0;
    getters.addShopList.map(n=>{
      total += n.num*n.price
    })
    return total;
  },
}
const actions={
  //加入购物车
  addToCart({commit},product){
    commit('addCart',{
      id:product.id
    })
  },
  //清空购物车
  clearToCart({commit}){
    commit('clearCart')
  },
  //删除单个物品
  deletToShop({commit},product){
    commit('deletShop',product)
  }
}
const mutations ={
  //加入购物车
  addCart(state,{id}){
    let record = state.add.find(n => n.id == id);
    if(!record){
      state.add.push({
        id,
        num:1
      })
    }else{
      record.num++;
    }
  },
  //删除单个物品
  deletShop(state,product){
    state.add.forEach((item,i)=>{
      if(item.id == product.id){
        state.add.splice(i,1)
      }
    })
  },
  //清空购物车
  clearCart(state){
    state.add=[];
  }
}
export default{
  state,
  getters,
  actions,
  mutations
}