app/sheep/components/s-select-sku/s-select-sku.vue

<template>
  <!-- 规格弹窗 -->
  <su-popup :show="show" round="10" @close="emits('close')">
    <!-- SKU 信息 -->
    <view class="ss-modal-box bg-white ss-flex-col">
      <view class="modal-header ss-flex ss-col-center">
        <view class="header-left ss-m-r-30">
          <image class="sku-image" :src="state.selectedSku.picUrl || goodsInfo.picUrl" mode="aspectFill" />
        </view>
        <view class="header-right ss-flex-col ss-row-between ss-flex-1">
          <view class="goods-title ss-line-2">{{ goodsInfo.name }}</view>
          <view class="header-right-bottom ss-flex ss-col-center ss-row-between">
            <view class="ss-flex">
              <view class="price-text">
                {{
                  fen2yuan(
                    state.selectedSku.promotionPrice || state.selectedSku.price || goodsInfo.price,
                  )
                }}
                <text v-if="state.selectedSku.promotionType > 0">
                  <text class="iconBox" v-if="state.selectedSku.promotionType === 4">
                    限时优惠
                  </text>
                  <text class="iconBox" v-else-if="state.selectedSku.promotionType === 6">
                    会员价
                  </text>
                  <text class="origin-price-text">
                    {{ fen2yuan(state.selectedSku.price) }}
                  </text>
                </text>
              </view>
            </view>
            <view class="stock-text ss-m-l-20">
              {{ formatStock('exact', state.selectedSku.stock || goodsInfo.stock) }}
            </view>
          </view>
        </view>
      </view>

      <!-- 属性选择 -->
      <view class="modal-content ss-flex-1">
        <scroll-view scroll-y="true" class="modal-content-scroll" @touchmove.stop>
          <view class="sku-item ss-m-b-20" v-for="property in propertyList" :key="property.id">
            <view class="label-text ss-m-b-20">{{ property.name }}</view>
            <view class="ss-flex ss-col-center ss-flex-wrap">
              <button class="ss-reset-button spec-btn" v-for="value in property.values" :class="[
                {
                  'ui-BG-Main-Gradient': state.currentPropertyArray[property.id] === value.id,
                },
                {
                  'disabled-btn': value.disabled === true,
                },
              ]" :key="value.id" :disabled="value.disabled === true" @tap="onSelectSku(property.id, value.id)">
                {{ value.name }}
              </button>
            </view>
          </view>
          <view class="buy-num-box ss-flex ss-col-center ss-row-between ss-m-b-40">
            <view class="label-text">购买数量</view>
            <su-number-box :min="1" :max="state.selectedSku.stock" :step="1" v-model="state.selectedSku.goods_num"
              @change="onNumberChange($event)" />
          </view>
        </scroll-view>
      </view>

      <!-- 操作区 -->
      <view class="modal-footer border-top">
        <view class="buy-box ss-flex ss-col-center ss-flex ss-col-center ss-row-center">
          <button class="ss-reset-button add-btn ui-Shadow-Main" @tap="onAddCart">加入购物车</button>
          <button class="ss-reset-button buy-btn ui-Shadow-Main" @tap="onBuy">立即购买</button>
        </view>
      </view>
    </view>
  </su-popup>
</template>

<script setup>
import { computed, reactive, watch } from 'vue';
import sheep from '@/sheep';
import { formatStock, convertProductPropertyList, fen2yuan } from '@/sheep/hooks/useGoods';

const emits = defineEmits(['change', 'addCart', 'buy', 'close']);
const props = defineProps({
  goodsInfo: {
    type: Object,
    default() { },
  },
  show: {
    type: Boolean,
    default: false,
  },
});

const state = reactive({
  selectedSku: {}, // 选中的 SKU
  currentPropertyArray: [], // 当前选中的属性，实际是个 Map。key 是 property 编号，value 是 value 编号
});

const propertyList = convertProductPropertyList(props.goodsInfo.skus);
// SKU 列表
const skuList = computed(() => {
  let skuPrices = props.goodsInfo.skus;
  for (let price of skuPrices) {
    price.value_id_array = price.properties.map((item) => item.valueId);
  }
  return skuPrices;
});

watch(
  () => state.selectedSku,
  (newVal) => {
    emits('change', newVal);
  },
  {
    immediate: true, // 立即执行
    deep: true, // 深度监听
  },
);

// 输入框改变数量
function onNumberChange(e) {
  if (e === 0) return;
  if (state.selectedSku.goods_num === e) return;
  state.selectedSku.goods_num = e;
}

// 加入购物车
function onAddCart() {
  if (state.selectedSku.id <= 0) {
    sheep.$helper.toast('请选择规格');
    return;
  }
  if (state.selectedSku.stock <= 0) {
    sheep.$helper.toast('库存不足');
    return;
  }

  emits('addCart', state.selectedSku);
}

// 立即购买
function onBuy() {
  if (state.selectedSku.id <= 0) {
    sheep.$helper.toast('请选择规格');
    return;
  }
  if (state.selectedSku.stock <= 0) {
    sheep.$helper.toast('库存不足');
    return;
  }
  emits('buy', state.selectedSku);
}

// 改变禁用状态：计算每个 property 属性值的按钮，是否禁用
function changeDisabled(isChecked = false, propertyId = 0, valueId = 0) {
  let newSkus = []; // 所有可以选择的 sku 数组
  if (isChecked) {
    // 情况一：选中 property
    // 获得当前点击选中 property 的、所有可用 SKU
    for (let price of skuList.value) {
      if (price.stock <= 0) {
        continue;
      }
      if (price.value_id_array.indexOf(valueId) >= 0) {
        newSkus.push(price);
      }
    }
  } else {
    // 情况二：取消选中 property
    // 当前所选 property 下，所有可以选择的 SKU
    newSkus = getCanUseSkuList();
  }

  // 所有存在并且有库存未选择的 SKU 的 value 属性值 id
  let noChooseValueIds = [];
  for (let price of newSkus) {
    noChooseValueIds = noChooseValueIds.concat(price.value_id_array);
  }
  noChooseValueIds = Array.from(new Set(noChooseValueIds)); // 去重

  if (isChecked) {
    // 去除当前选中的 value 属性值 id
    let index = noChooseValueIds.indexOf(valueId);
    noChooseValueIds.splice(index, 1);
  } else {
    // 循环去除当前已选择的 value 属性值 id
    state.currentPropertyArray.forEach((currentPropertyId) => {
      if (currentPropertyId.toString() !== '') {
        return;
      }
      // currentPropertyId 为空是反选 填充的
      let index = noChooseValueIds.indexOf(currentPropertyId);
      if (index >= 0) {
        // currentPropertyId 存在于 noChooseValueIds
        noChooseValueIds.splice(index, 1);
      }
    });
  }

  // 当前已选择的 property 数组
  let choosePropertyIds = [];
  if (!isChecked) {
    // 当前已选择的 property
    state.currentPropertyArray.forEach((currentPropertyId, currentValueId) => {
      if (currentPropertyId !== '') {
        // currentPropertyId 为空是反选 填充的
        choosePropertyIds.push(currentValueId);
      }
    });
  } else {
    // 当前点击选择的 property
    choosePropertyIds = [propertyId];
  }

  for (let propertyIndex in propertyList) {
    // 当前点击的 property、或者取消选择时候，已选中的 property 不进行处理
    if (choosePropertyIds.indexOf(propertyList[propertyIndex]['id']) >= 0) {
      continue;
    }
    // 如果当前 property id 不存在于有库存的 SKU 中，则禁用
    for (let valueIndex in propertyList[propertyIndex]['values']) {
      propertyList[propertyIndex]['values'][valueIndex]['disabled'] =
        noChooseValueIds.indexOf(propertyList[propertyIndex]['values'][valueIndex]['id']) < 0; // true 禁用 or false 不禁用
    }
  }
}

// 当前所选属性下，获取所有有库存的 SKU 们
function getCanUseSkuList() {
  let newSkus = [];
  for (let sku of skuList.value) {
    if (sku.stock <= 0) {
      continue;
    }
    let isOk = true;
    state.currentPropertyArray.forEach((propertyId) => {
      // propertyId 不为空，并且，这个 条 sku 没有被选中，则排除
      if (propertyId.toString() !== '' && sku.value_id_array.indexOf(propertyId) < 0) {
        isOk = false;
      }
    });
    if (isOk) {
      newSkus.push(sku);
    }
  }
  return newSkus;
}

// 选择规格
function onSelectSku(propertyId, valueId) {
  // 清空已选择
  let isChecked = true; // 选中 or 取消选中
  if (
    state.currentPropertyArray[propertyId] !== undefined &&
    state.currentPropertyArray[propertyId] === valueId
  ) {
    // 点击已被选中的，删除并填充 ''
    isChecked = false;
    state.currentPropertyArray.splice(propertyId, 1, '');
  } else {
    // 选中
    state.currentPropertyArray[propertyId] = valueId;
  }

  // 选中的 property 大类
  let choosePropertyId = [];
  state.currentPropertyArray.forEach((currentPropertyId) => {
    if (currentPropertyId !== '') {
      // currentPropertyId 为空是反选 填充的
      choosePropertyId.push(currentPropertyId);
    }
  });

  // 当前所选 property 下，所有可以选择的 SKU 们
  let newSkuList = getCanUseSkuList();

  // 判断所有 property 大类是否选择完成
  if (choosePropertyId.length === propertyList.length && newSkuList.length) {
    newSkuList[0].goods_num = state.selectedSku.goods_num || 1;
    state.selectedSku = newSkuList[0];
  } else {
    state.selectedSku = {};
  }

  // 改变 property 禁用状态
  changeDisabled(isChecked, propertyId, valueId);
}

changeDisabled(false);
// TODO 芋艿：待讨论的优化点：1）单规格，要不要默认选中；2）默认要不要选中第一个规格
</script>

<style lang="scss" scoped>
// 购买
.buy-box {
  padding: 10rpx 0;

  .add-btn {
    width: 356rpx;
    height: 80rpx;
    border-radius: 40rpx 0 0 40rpx;
    background-color: var(--ui-BG-Main-light);
    color: var(--ui-BG-Main);
  }

  .buy-btn {
    width: 356rpx;
    height: 80rpx;
    border-radius: 0 40rpx 40rpx 0;
    background: linear-gradient(90deg, var(--ui-BG-Main), var(--ui-BG-Main-gradient));
    color: #fff;
  }

  .score-btn {
    width: 100%;
    margin: 0 20rpx;
    height: 80rpx;
    border-radius: 40rpx;
    background: linear-gradient(90deg, var(--ui-BG-Main), var(--ui-BG-Main-gradient));
    color: #fff;
  }
}

.ss-modal-box {
  border-radius: 30rpx 30rpx 0 0;
  max-height: 1000rpx;

  .modal-header {
    position: relative;
    padding: 80rpx 20rpx 40rpx;

    .sku-image {
      width: 160rpx;
      height: 160rpx;
      border-radius: 10rpx;
    }

    .header-right {
      height: 160rpx;
    }

    .close-icon {
      position: absolute;
      top: 10rpx;
      right: 20rpx;
      font-size: 46rpx;
      opacity: 0.2;
    }

    .goods-title {
      font-size: 28rpx;
      font-weight: 500;
      line-height: 42rpx;
    }

    .score-img {
      width: 36rpx;
      height: 36rpx;
      margin: 0 4rpx;
    }

    .score-text {
      font-size: 30rpx;
      font-weight: 500;
      color: $red;
      font-family: OPPOSANS;
    }

    .price-text {
      font-size: 30rpx;
      font-weight: 500;
      color: $red;
      font-family: OPPOSANS;

      &::before {
        content: '￥';
        font-size: 30rpx;
        font-weight: 500;
        color: $red;
      }
    }

    .stock-text {
      font-size: 26rpx;
      color: #999999;
    }
  }

  .modal-content {
    padding: 0 20rpx;

    .modal-content-scroll {
      max-height: 600rpx;

      .label-text {
        font-size: 26rpx;
        font-weight: 500;
      }

      .buy-num-box {
        height: 100rpx;
      }

      .spec-btn {
        height: 60rpx;
        min-width: 100rpx;
        padding: 0 30rpx;
        background: #f4f4f4;
        border-radius: 30rpx;
        color: #434343;
        font-size: 26rpx;
        margin-right: 10rpx;
        margin-bottom: 10rpx;
      }

      .disabled-btn {
        font-weight: 400;
        color: #c6c6c6;
        background: #f8f8f8;
      }
    }
  }
}

.iconBox {
  width: fit-content;
  height: fit-content;
  padding: 2rpx 10rpx;
  background-color: rgb(255, 242, 241);
  color: #ff2621;
  font-size: 24rpx;
  margin-left: 5rpx;
}

.origin-price-text {
  font-size: 26rpx;
  font-weight: 400;
  text-decoration: line-through;
  color: $gray-c;
  font-family: OPPOSANS;

  &::before {
    content: '￥';
  }
}
</style>