<template>
  <popup
    v-if="!isSkuEmpty"
    v-model="show"
    position="bottom"
    class="van-sku-container"
    :close-on-click-overlay="closeOnClickOverlay"
    :get-container="getContainer"
  >
    <!-- sku-header -->
    <slot
      name="sku-header"
      :sku-event-bus="skuEventBus"
      :selected-sku="selectedSku"
      :selected-sku-comb="selectedSkuComb"
    >
      <sku-header
        :sku-event-bus="skuEventBus"
        :selected-sku="selectedSku"
        :goods="goods"
        :sku="sku"
      >
        <slot
          name="sku-header-price"
          :price="price"
          :selected-sku-comb="selectedSkuComb"
        >
          <div class="van-sku__goods-price">
            <span class="van-sku__price-symbol">￥</span><span class="van-sku__price-num">{{ price }}</span>
          </div>
        </slot>
      </sku-header>
    </slot>
    <div class="van-sku-body" :style="bodyStyle">
      <!-- sku-body-top -->
      <slot name="sku-body-top" :selected-sku="selectedSku" :sku-event-bus="skuEventBus" />
      <!-- sku-group -->
      <slot name="sku-group" :selected-sku="selectedSku" :sku-event-bus="skuEventBus">
        <div v-if="hasSku" class="van-sku-group-container van-hairline--bottom">
          <sku-row
            v-for="(skuTreeItem, index) in skuTree"
            :key="index"
            :sku-row="skuTreeItem"
          >
            <sku-row-item
              v-for="(skuValue, index) in skuTreeItem.v"
              :key="index"
              :sku-key-str="skuTreeItem.k_s"
              :sku-value="skuValue"
              :sku-event-bus="skuEventBus"
              :selected-sku="selectedSku"
              :sku-list="sku.list"
            />
          </sku-row>
        </div>
      </slot>
      <!-- extra-sku-group -->
      <slot name="extra-sku-group" :sku-event-bus="skuEventBus"/>
      <!-- sku-stepper -->
      <slot
        name="sku-stepper"
        :sku-event-bus="skuEventBus"
        :selected-sku="selectedSku"
        :selected-sku-comb="selectedSkuComb"
        :selected-num="selectedNum"
      >
        <sku-stepper
          ref="skuStepper"
          :sku-event-bus="skuEventBus"
          :selected-sku="selectedSku"
          :selected-sku-comb="selectedSkuComb"
          :selected-num="selectedNum"
          :stepper-title="stepperTitle"
          :sku-stock-num="sku.stock_num"
          :quota="quota"
          :quota-used="quotaUsed"
          :disable-stepper-input="disableStepperInput"
          :hide-stock="hideStock"
          :custom-stepper-config="customStepperConfig"
          @change="$emit('stepper-change', $event)"
        />
      </slot>
      <!-- sku-messages -->
      <slot name="sku-messages">
        <sku-messages
          ref="skuMessages"
          :goods-id="goodsId"
          :message-config="messageConfig"
          :messages="sku.messages"
        />
      </slot>
    </div>
    <!-- sku-actions -->
    <slot name="sku-actions" :sku-event-bus="skuEventBus">
      <sku-actions
        :sku-event-bus="skuEventBus"
        :buy-text="buyText"
        :show-add-cart-btn="showAddCartBtn"
      />
    </slot>
  </popup>
</template>

<script>
/* eslint-disable camelcase */
import Vue from 'vue';
import Popup from '../popup';
import Toast from '../toast';
import SkuHeader from './components/SkuHeader';
import SkuRow from './components/SkuRow';
import SkuRowItem from './components/SkuRowItem';
import SkuStepper from './components/SkuStepper';
import SkuMessages from './components/SkuMessages';
import SkuActions from './components/SkuActions';
import {
  isAllSelected,
  isSkuChoosable,
  getSkuComb,
  getSelectedSkuValues
} from './utils/skuHelper';
import { LIMIT_TYPE, UNSELECTED_SKU_VALUE_ID } from './constants';
import create from '../utils/create';

const { QUOTA_LIMIT } = LIMIT_TYPE;

export default create({
  name: 'sku',

  components: {
    Popup,
    SkuHeader,
    SkuRow,
    SkuRowItem,
    SkuStepper,
    SkuMessages,
    SkuActions
  },

  props: {
    sku: Object,
    goods: Object,
    value: Boolean,
    buyText: String,
    goodsId: [Number, String],
    stepperTitle: String,
    hideStock: Boolean,
    getContainer: Function,
    resetStepperOnHide: Boolean,
    resetSelectedSkuOnHide: Boolean,
    disableStepperInput: Boolean,
    closeOnClickOverlay: Boolean,
    initialSku: {
      type: Object,
      default: () => ({})
    },
    quota: {
      type: Number,
      default: 0
    },
    quotaUsed: {
      type: Number,
      default: 0
    },
    showAddCartBtn: {
      type: Boolean,
      default: true
    },
    bodyOffsetTop: {
      type: Number,
      default: 200
    },
    messageConfig: {
      type: Object,
      default: () => ({
        placeholderMap: {},
        uploadImg: () => Promise.resolve(),
        uploadMaxSize: 5
      })
    },
    customStepperConfig: {
      type: Object,
      default: () => ({})
    },
    customSkuValidator: Function
  },

  data() {
    return {
      selectedSku: {},
      selectedNum: 1,
      show: this.value
    };
  },

  watch: {
    show(val) {
      this.$emit('input', val);
      if (!val) {
        const selectedSkuValues = getSelectedSkuValues(
          this.sku.tree,
          this.selectedSku
        );

        this.$emit('sku-close', {
          selectedSkuValues,
          selectedNum: this.selectedNum,
          selectedSkuComb: this.selectedSkuComb
        });

        if (this.resetStepperOnHide) {
          this.$refs.skuStepper && this.$refs.skuStepper.setCurrentNum(1);
        }

        if (this.resetSelectedSkuOnHide) {
          this.resetSelectedSku(this.skuTree);
        }
      }
    },
    value(val) {
      this.show = val;
    },
    skuTree(val) {
      this.resetSelectedSku(val);
    }
  },

  computed: {
    bodyStyle() {
      if (this.$isServer) {
        return;
      }

      // header高度82px, sku actions高度50px，如果改动了样式自己传下bodyOffsetTop调整下
      const maxHeight = window.innerHeight - this.bodyOffsetTop;

      return {
        maxHeight: maxHeight + 'px'
      };
    },

    isSkuCombSelected() {
      return isAllSelected(this.sku.tree, this.selectedSku);
    },

    isSkuEmpty() {
      return Object.keys(this.sku).length === 0;
    },

    hasSku() {
      return !this.sku.none_sku;
    },

    selectedSkuComb() {
      if (!this.hasSku) {
        return {
          id: this.sku.collection_id,
          price: Math.round(this.sku.price * 100),
          stock_num: this.sku.stock_num
        };
      } else if (this.isSkuCombSelected) {
        return getSkuComb(this.sku.list, this.selectedSku);
      }
      return null;
    },

    price() {
      if (this.selectedSkuComb) {
        return (this.selectedSkuComb.price / 100).toFixed(2);
      }
      // sku.price是一个格式化好的价格区间
      return this.sku.price;
    },

    skuTree() {
      return this.sku.tree || [];
    }
  },

  created() {
    const skuEventBus = new Vue();
    this.skuEventBus = skuEventBus;

    skuEventBus.$on('sku:close', this.onClose);
    skuEventBus.$on('sku:select', this.onSelect);
    skuEventBus.$on('sku:numChange', this.onNumChange);
    skuEventBus.$on('sku:overLimit', this.onOverLimit);
    skuEventBus.$on('sku:addCart', this.onAddCart);
    skuEventBus.$on('sku:buy', this.onBuy);

    this.resetSelectedSku(this.skuTree);
    // 组件初始化后的钩子，抛出skuEventBus
    this.$emit('after-sku-create', skuEventBus);
  },

  methods: {
    resetSelectedSku(skuTree) {
      this.selectedSku = {};
      // 重置selectedSku
      skuTree.forEach(item => {
        this.selectedSku[item.k_s] = this.initialSku[item.k_s] || UNSELECTED_SKU_VALUE_ID;
      });
      // 只有一个sku规格值时默认选中
      skuTree.forEach(item => {
        const key = item.k_s;
        const valueId = item.v[0].id;
        if (
          item.v.length === 1 &&
          isSkuChoosable(this.sku.list, this.selectedSku, { key, valueId })
        ) {
          this.selectedSku[key] = valueId;
        }
      });
    },

    getSkuMessages() {
      return this.$refs.skuMessages ? this.$refs.skuMessages.getMessages() : {};
    },

    getSkuCartMessages() {
      return this.$refs.skuMessages
        ? this.$refs.skuMessages.getCartMessages()
        : {};
    },

    validateSkuMessages() {
      return this.$refs.skuMessages
        ? this.$refs.skuMessages.validateMessages()
        : '';
    },

    validateSku() {
      if (this.selectedNum === 0) {
        return '商品已经无法购买啦';
      }

      if (this.isSkuCombSelected) {
        return this.validateSkuMessages();
      }

      // 自定义sku校验
      if (this.customSkuValidator) {
        const err = this.customSkuValidator(this);
        if (err) return err;
      }

      return '请先选择商品规格';
    },

    onClose() {
      this.show = false;
    },

    onSelect(skuValue) {
      // 点击已选中的sku时则取消选中
      this.selectedSku =
        this.selectedSku[skuValue.skuKeyStr] === skuValue.id
          ? { ...this.selectedSku, [skuValue.skuKeyStr]: UNSELECTED_SKU_VALUE_ID }
          : { ...this.selectedSku, [skuValue.skuKeyStr]: skuValue.id };

      this.$emit('sku-selected', {
        skuValue,
        selectedSku: this.selectedSku,
        selectedSkuComb: this.selectedSkuComb
      });
    },

    onNumChange(num) {
      this.selectedNum = num;
    },

    onOverLimit(data) {
      const { action, limitType, quota, quotaUsed } = data;
      const { handleOverLimit } = this.customStepperConfig;

      if (handleOverLimit) {
        handleOverLimit(data);
        return;
      }

      if (action === 'minus') {
        Toast('至少选择一件');
      } else if (action === 'plus') {
        if (limitType === QUOTA_LIMIT) {
          let msg = `限购${quota}件`;
          if (quotaUsed > 0) msg += `，${`您已购买${quotaUsed}件`}`;
          Toast(msg);
        } else {
          Toast('库存不足');
        }
      }
    },

    onAddCart() {
      this.onBuyOrAddCart('add-cart');
    },

    onBuy() {
      this.onBuyOrAddCart('buy-clicked');
    },

    onBuyOrAddCart(type) {
      const error = this.validateSku();
      if (error) {
        Toast(error);
      } else {
        this.$emit(type, this.getSkuData());
      }
    },

    getSkuData() {
      return {
        goodsId: this.goodsId,
        selectedNum: this.selectedNum,
        selectedSkuComb: this.selectedSkuComb,
        messages: this.getSkuMessages(),
        cartMessages: this.getSkuCartMessages()
      };
    }
  }
});
</script>
