<template>
  <!-- SKU 信息 -->
  <div>
    <!-- 属性选择 -->
    <div class="d-flex mb-5" v-for="property in propertyList" :key="property.id">
      <span class="parameterColor mb-1">{{ property.name }}</span>：
      <span style="flex: 1;">
        <v-chip
          class="spec-btn mb-1 mr-3"
          :class="[
            { 'ui-BG-Main-Gradient': state.currentPropertyArray[property.id] === value.id, },
            { 'disabled-btn': value.disabled === true, },
          ]"
          v-for="value in property.values"
          :key="value.id"
          size="small"
          label
          density="comfortable"
          color="primary"
          variant="outlined"
          :disabled="value.disabled === true"
          @click="onSelectSku(property.id, value.id)"
        >
          {{ value.name }}
        </v-chip>
      </span>
    </div>
    <!-- 购买数量 -->
    <div class="modal-content">
      <div>
        <div class="buyCount mb-10">
          <span class="parameterColor"><span class="l-s-10">数量</span>：</span>
          <su-number-box
            :min="1"
            :max="state.selectedSku.stock"
            :totalStock="totalStock"
            :step="1"
            ref="selectSkuRef"
            v-model="state.selectedSku.goods_num"
            @change="onNumberChange($event)"
          />
        </div>
      </div>
    </div>
    <!-- 操作区 -->
    <div>
      <v-btn class="buttons" color="primary" @click="onBuy">立即购买</v-btn>
      <v-btn class="ml-3 px-8" color="warning" @click="onAddCart">加入购物车</v-btn>
    </div>
  </div>
</template>

<script setup>
defineOptions({name: 'wares-s-select-sku'})
import Snackbar from '@/plugins/snackbar'
import suNumberBox from '@/components/FormUI/su-number-box/su-number-box.vue'
import { computed, reactive, watch, ref } from 'vue'
import { convertProductPropertyList } from '@/views/mall/utils'

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

  const totalStock = ref(props.goodsInfo?.stock-0 || 0)
  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) => {
      if (newVal?.stock) totalStock.value = newVal.stock
      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) {
      Snackbar.warning('请选择商品规格')
      return;
    }
    if (state.selectedSku.stock <= 0) {
      Snackbar.warning('库存不足')
      return;
    }

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

  // 立即购买
  function onBuy() {
    if (!state?.selectedSku?.id || state.selectedSku.id <= 0) {
      Snackbar.warning('请选择商品规格')
      return;
    }
    if (!state?.selectedSku?.stock || state.selectedSku.stock <= 0) {
      Snackbar.warning('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>
  // 主题色渐变，横向
  .ui-BG-Main-Gradient {
    // background: linear-gradient(90deg, #ff3000, #ff300099);
    background: var(--v-primary-base);
    color: #fff !important;
  }
  .disabled-btn {
    color: #c6c6c6;
    background: #f8f8f8;
  }
  .parameterColor {
    color: #7a7a7a;
  }
  input::-webkit-outer-spin-button, input::-webkit-inner-spin-button{
    -webkit-appearance: none !important;
    margin: 0; 
  }
  .inputItem {
    width: 70px; border: 1px solid #eee; padding: 0 5px; text-align: center;
  }
  .buyCount {
    display: flex;
    align-items: center;
  }
  .ss-modal-box {
    border-radius: 30px 30px 0 0;
    max-height: 1000px;

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

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

      .header-right {
        height: 160px;
      }

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

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

      .score-img {
        width: 36px;
        height: 36px;
        margin: 0 4px;
      }
      .stock-text {
        font-size: 26px;
        color: #999999;
      }
    }

    .modal-content {
      padding: 0 20px;

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

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

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

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

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

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

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

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