<template>
  <view class="gg">
    <u-navbar :border-bottom="false" :is-back="false">
      <view class="u-flex u-m-l-20 u-m-r-20">
        <view class="u-font-xl u-m-r-20">购物车</view>
        <view class="u-font-xs u-light-color u-p-t-10">共{{ getSelectedCount }}件商品</view>
      </view>
    </u-navbar>

    <view class="gg-content">
      <scroll-view v-if="getCartInfoList" class="gg-cart-sv-container" scroll-y="true">
        <u-checkbox-group>

          <view v-for="(cartInfoListItem, index) in getCartInfoList" :key="index">
            <u-card :border="false" :padding="10" :show-head="showMultiCheckbox(index)">
              <view slot="head" class="u-m-10">
                <u-checkbox
                    :name="getMultiCheckedIds(index)"
                    :value="getMultiCheckCart(index)"
                    active-color="red"
                    shape="circle"
                    @change="changeMultiChecked"
                ></u-checkbox>
                <text>{{ cartInfoListItem.activityRule.ruleDesc }}</text>
              </view>
              <view slot="body">
                <view v-for="(cartInfoItem, idx) in cartInfoListItem.cartInfoList" :key="idx">
                  <!-- 动态class绑定是为了确保最后一条底部线条不显示 -->
                  <view :class="{ 'u-border-bottom': idx !== cartInfoListItem.cartInfoList.length - 1 }"
                        class="u-body-item u-flex u-col-between u-p-10">
                    <u-checkbox
                        v-model="cartInfoItem.isChecked"
                        :name="cartInfoItem.skuId"
                        active-color="red"
                        shape="circle"
                        @change="changeChecked"
                    ></u-checkbox>
                    <ListImgItem
                        :lazyLoad="false"
                        :showBottom="cartInfoItem.skuType === 0 && cartInfoItem.isNewPerson === 1"
                        :showLeft="cartInfoItem.skuType === 1"
                        :showRight="false"
                        :src="cartInfoItem.imgUrl"
                        height="200rpx"
                        width="200rpx"
                    ></ListImgItem>
                    <view class="u-p-b-20 u-m-l-20" style="flex:1">
                      <view class="u-font-lg">{{ cartInfoItem.skuName }}</view>
                      <view class="u-flex u-row-between">
                        <view class="u-type-error">
                          <text>￥</text>
                          <text>{{ cartInfoItem.cartPrice }}</text>
                        </view>
                        <AddToCart :shopDetail="cartInfoItem" :skuId="cartInfoItem.skuId"></AddToCart>
                      </view>
                    </view>
                  </view>
                </view>
              </view>
            </u-card>
          </view>
        </u-checkbox-group>
      </scroll-view>

      <u-empty v-else :margin-top="300" mode="car">
        <u-button slot="bottom" type="error" @click="gotoCategory">点击购买商品</u-button>
      </u-empty>

      <view class="gg-navigation">
        <view class="navigation">
          <view class="left">
            <view class="item u-m-t-20">
              <u-checkbox :value="isAllSelected" active-color="red" shape="circle"
                          @change="changeAllSelected"></u-checkbox>
            </view>
            <view class="item">
              <view class="u-font-sm u-line-1">
                <view class="u-type-error">现价:￥{{ getCartPriceInfo.totalAmount }}</view>
                <view class="u-font-xs u-type-info">
                  优惠券优惠:￥{{ getCartPriceInfo.couponReduceAmount }}
                  <text class="u-font-xs u-m-l-20 u-type-info">原价:</text>
                  <text class="u-font-xs u-type-info">￥{{ getCartPriceInfo.originalTotalAmount }}</text>
                </view>
              </view>
            </view>
            <!-- <view class="item car u-type-info" v-if="getCartCouponInfoList.length > 0" @click="showCouponInfoList = true">
              <u-icon name="gift-fill" :size="40" :color="$u.color['contentColor']"></u-icon>
              <view class="text u-line-1">优惠券</view>
            </view> -->
          </view>
          <view class="right">
            <view class="buy btn u-line-1" @click="gotoConfirmOrder">立即购买</view>
          </view>
        </view>
      </view>
    </view>

    <CouponInfoList :couponInfoList="getCartCouponInfoList"
                    :showCouponInfoList.sync="showCouponInfoList"></CouponInfoList>
  </view>
</template>

<script>
import {mapActions, mapGetters} from 'vuex';

export default {
  data() {
    return {
      showCouponInfoList: false
    };
  },
  computed: {
    ...mapGetters('cartModule', [
      'getCartInfoList',
      'showMultiCheckbox',
      'getMultiCheckCart',
      'getMultiCheckedIds',
      'isAllSelected',
      'getCartPriceInfo',
      'getSelectedCount',
      'getCartCouponInfoList'
    ])
  },
  methods: {
    ...mapActions('cartModule', ['getActivityCartListAction', 'changeCheckCartAction', 'changeMultiCheckedCartAction', 'changeAllCheckCartAction']),
    ...mapActions('cartModule', ['getCartListAction']),
    // 到分类页购买商品
    gotoCategory() {
      uni.switchTab({
        url: '/pages/categories/categories'
      });
    },
    // 修改单个商品选中状态
    changeChecked(detail) {
      let isChecked = 1;
      const {name: skuId, value} = detail;
      if (!value) isChecked = 0;
      this.changeCheckCartAction({skuId, isChecked});
    },
    // 修改多个商品的选中状态
    changeMultiChecked(detail) {
      let skuIdList = [];
      skuIdList = detail.name.split(',');
      const isChecked = detail.value === true ? 1 : 0;
      this.changeMultiCheckedCartAction({skuIdList, isChecked});
    },
    // 全部选中/返选
    changeAllSelected(detail) {
      this.changeAllCheckCartAction({isChecked: detail.value === true ? 1 : 0});
    },
    // 跳转至确认订单
    gotoConfirmOrder() {
      this.$u.route('/pagesOrder/confirmOrder/confirmOrder')
    }
  },
  // 思考：为什么需要将请求放置于onShow钩子函数中，
  // 主要考虑tabs切换后需要进行实时数据的获取
  onShow() {
    this.getActivityCartListAction({showLoading: true});
  },
  mounted() {
    // 需要获取购物车数据列表，将最新获取的数据渲染到页面
    this.getCartListAction();
  }
};
</script>

<style lang="scss">
.gg {
  height: 100%;
  background-color: $u-bg-color;

  // scrollView的固定高度设置
  // 底部导航与顶部自定义导航高度需要减去
  &-cart-sv-container {
    height: calc(100vh - 90rpx - 136rpx);
  }

  // 底部导航
  &-navigation {
    width: 100%;
    height: 90rpx;
    position: fixed;
    bottom: 0;

    .navigation {
      height: 100%;
      display: flex;
      border: solid 2rpx #f2f2f2;
      background-color: #ffffff;
      padding: 12rpx 0;

      .left {
        display: flex;
        flex: 1;
        font-size: 20rpx;

        .item {
          margin: 0 10rpx;

          &.car {
            text-align: center;
            position: relative;
          }
        }
      }

      .right {
        display: flex;
        font-size: 28rpx;
        align-items: center;

        .btn {
          line-height: 66rpx;
          padding: 0 30rpx;
          border-radius: 36rpx;
          color: #ffffff;
        }

        .buy {
          background-color: #ff7900;
          margin: 0 30rpx;
        }
      }
    }
  }
}
</style>
