<!--
 * @Author: ch
 * @Date: 2022-03-24 11:30:55
 * @LastEditors: ch
 * @LastEditTime: 2022-04-06 14:24:05
 * @Description: file content
-->
<template>
	<u-popup :show="visible" round="24rpx">
		<view class="sku-popup">
			<view class="product-info">
				<image class="product-img" src="https://msb-edu-dev.oss-cn-beijing.aliyuncs.com/test/1.png"/>
				<view>
					<view>{{curSku.sellPrice}}</view>
					<text>{{curSku.name}}</text>
					<view>库存{{curSku.stock}}</view>
				</view>
			</view>
			<view class="attr-group" v-for="(item, index) in attributeGroupList" :key="item.id">
				<text class="attr-name">{{item.name}}</text>
				<view class="attr-items">
					<text class="attr-item" :class="{'attr-item__active' : i.active, 'attr-item__disabled' : i.disabled}"
						v-for="i in item.attributes" :key="i.symbol"
						@click="handleAttrItem(i, index)"
					>{{i.name}}</text>
				</view>
			</view>
			<view class="sku-num">
				<view>
					<text>数量</text>
					<text>有货</text>
				</view>
				<u-number-box :min="1" :max="maxBuyNum" button-size="40rpx" bgColor="#F5F6FA" 
					v-model="curBuyNum" >
					<text slot="minus" class="cart-item--stepper-icon">-</text>
					<text slot="plus" class="cart-item--stepper-icon">+</text>
				</u-number-box>
			</view>
			<view class="footer">
				<UiButton @click="addCart">加入购物车</UiButton>
				<UiButton>立即购买</UiButton>
				<UiButton>确认</UiButton>
			</view>
		</view>
		
	</u-popup>
</template>

<script>
import UiButton from '../../../components/UiButton.vue';
import {ApiPutAddCart} from '@/common/api/cart';

export default {
	components: { UiButton },
	props: {
		// true 组件显示 false 组件隐藏
		visible : {
			type : Boolean,
			default : false
		},
		// 模式 1:都显示 2:只显示购物车 3:只显示立即购买
		mode: {
			type: Number,
			default: 1,
		},
		// 商品详情信息
		goodsInfo: {
			type: Object,
			default: {},
		},
		// 商品sku信息
		skuInfo : {
			type : Array,
			default : []
		}
	},
	data() {
		return {
			// 属性组数据，因为会修改数据，不能直接操作props中传入的数据
			attributeGroupList : [],
			// 数量
			curBuyNum : 1,
		};
	},
	watch : {
		goodsInfo(newData){
			if(newData.attributeGroupList){
				this.attributeGroupList = newData.attributeGroupList;
				// 请求数据返回后设置默认选中规格
				if(this.skuInfo.length){
					this.setDefaultAttr();
				}
			} 
		},
		skuInfo(newData){
			// 请求数据返回后设置默认选中规格
			if(newData.length){
				this.setDefaultAttr();
			}
		}
	},
	computed : {
		/**
		 * 当前选中SKU，根据选中规格计算
		 */
		curSku(){
			const skuSymbolList = this.attributeGroupList.map(item => {
				const activeAttr = item.attributes.find(i => i.active);
				return activeAttr ? activeAttr.symbol : ''
			}).filter(i => i);
			return this.skuInfo.find(i => i.attributeSymbolList === skuSymbolList.join(',')) || {};
		},
		/**
		 * 最大可购买数量
		 * 1、有限购则对比限购跟库存，取最小值
		 * 2、没限购取库存
		 */
		maxBuyNum(){
			const singleBuyLimit = this.goodsInfo.singleBuyLimit;
			const stock = this.curSku.stock;
			return singleBuyLimit ? Math.min(singleBuyLimit, stock || 1) : stock;
		}
	},
	methods: {
		/**
		 * 设置默认选中规格
		 */
		setDefaultAttr(){
			const curSku = this.skuInfo.find(i => i.stock > 0);
			this.attributeGroupList.forEach(item => {
				for(let i of item.attributes){
					if(curSku.attributeSymbolList.includes(i.symbol)){
						this.$set(i,'active', true);
						break;
					}
				}
			})
		},
		/**
		 * 点击属性项，设置选中和禁用项
		 */
		handleAttrItem(item, groupIndex){
			// 禁用选项
			if(item.disabled){
				return false;
			}
			// 每次重选规格，购买数量都置为1
			this.curBuyNum = 1;

			// 把当前选项组的装先置为未选状态
			this.attributeGroupList[groupIndex].attributes.forEach(item =>{
				this.$set(item,'active', false);
			});
			// 设置当前点击选项选中
			this.$set(item,'active', true);
			// 找到有效SKU的symbol   有效定义：包含当前选项属性,且库存大于0的所有SKU，
			const symbols = this.skuInfo.filter(i => i.attributeSymbolList.includes(item.symbol) && i.stock > 0)
				.map(i => i.attributeSymbolList).join(',');
			
			this.attributeGroupList.forEach((group, index) => {
				if(groupIndex === index){
					return false;
				}
				// 遍历其他选项组的所有属性项，对比是否在有效SKU的symbos中，在则启用，不再则禁用
				group.attributes.forEach(item =>{
					if(!symbols.includes(item.symbol)){
						this.$set(item,'disabled', true);
					}else{
						this.$set(item,'disabled', false);
					}
				})
			})
		},
		/**
		 * 加入购物车
		 */
		async addCart(){
			const {error, result} = await ApiPutAddCart({
				productSkuId : this.curSku.skuId,
				productId : this.goodsInfo.id,
				number : this.curBuyNum
			});
			if(error){
				uni.$u.toast(error.message);
				return false;
			}
			this.$Router.push('/cart');
		},
		/**
		 * 立即购买
		 */
		buyNow(){
			
		}
	}
};
</script>

<style lang="scss" scoped>
.sku-popup{
	padding: 30rpx;
}
.product-info{
	display: flex;
}
.product-img{
	width: 200rpx;
	height: 200rpx;
}
.attr-group{
	margin-top: 40rpx;
	font-size: 30rpx;
}
.attr-items{
	display: flex;
	flex-wrap: wrap;
	padding: 10rpx 0;
}
.attr-item{
	background: #F8F8F8;
	line-height: 70rpx;
	border-radius: 100rpx;
	border: 1px solid #F8F8F8;
	color: #666;
	display: block;
	min-width: 158rpx;
	max-width: 630rpx;
	text-align: center;
	margin: 20rpx 28rpx 0 0;
	padding: 0 20rpx;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	&__active{
		background: #FFF3EE;
		border-color: #FF512B;
		color: #FF875B;
	}
	&__disabled{
		color: #ccc;
	}
}
.sku-num{
	display: flex;
	justify-content: space-between;
	margin: 40rpx 0;
}
.footer{
	display: flex;
	justify-content: space-between;
}
</style>
