<!--
 * @Author: ch
 * @Date: 2022-03-24 11:30:55
 * @LastEditors: ch
 * @LastEditTime: 2022-05-10 11:18:33
 * @Description: file content
-->
<template>
	<u-popup :show="visible" round="24rpx" closeable @close="close">
		<view class="sku-popup">
			<view class="product-info">
				<!-- <image class="product-info--img" src="https://msb-edu-dev.oss-cn-beijing.aliyuncs.com/test/1.png"/> -->
				<image class="product-info--img" :src="goodsInfo.pictureList[0]"/>
				<view>
					<view v-if="curSku.sellPrice" class="product-info--price">￥{{curSku.sellPrice}}</view>
					<view v-else class="product-info--price">
							￥{{activityStatus === 'startActivity' ? goodsInfo.productActivityVO.activityPrice : goodsInfo.startingPrice}}
					</view>
					<view class="product-info--sku">{{curSku.name}}</view>
					<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 class="sku-num--single-box">
					<template>
						<text>数量</text>
						<text class="sku-num--single" v-if="goodsInfo.singleBuyLimit > 0">限购：{{goodsInfo.singleBuyLimit}}</text>
					</template>
				</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">
				<view class="btn-bg" v-if="mode == 1">
					<UiButton class="btn" @click="addCart" size="max" :disable="curSku.stock == 0">加入购物车</UiButton>
					<UiButton class="btn btn__buy" @click="buyNow" size="max" :disable="curSku.stock == 0">立即购买</UiButton>
				</view>
				<UiButton v-else class="btn__confirm" type="gradual" size="max" @click="confirm">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 : []
		},
		// 活动状态
		activityStatus : {
			type : String,
			default : 'noActivity'
		}
	},
	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(){
			return this.skuInfo.find(i => i.attributeSymbolList === this.selectedSymbol.join(',')) || {};
		},
		// [1,.,3]
		selectedSymbol(){
			return this.attributeGroupList.map(item => {
				const activeAttr = item.attributes.find(i => i.active);
				return activeAttr ? activeAttr.symbol : '.'
			}).filter(i => i)//.sort();
		},
		/**
		 * 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);
			if(!curSku){
				return false
			}
			this.attributeGroupList.forEach((item, index) => {
				for(let i of item.attributes){
					if(curSku.attributeSymbolList.includes(i.symbol)){
						this.$set(i,'active', true);
						this.setDisabledItem(i, index, true);
						break;
					}
				}
			});
			this.$emit('input',this.curSku);
		},
		/**
		 * 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;
			const active = item.active;
			// 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', !active);
			this.setDisabledItem(item, groupIndex);

			this.$emit('input',this.curSku);
			
		},
		/**
		 * 每次点击选项属性时，计算不可选属性
		 */
		setDisabledItem(item, groupIndex){
			
			this.attributeGroupList.forEach((group, idx) => {
				// 拿到已选项数组，这个是按照项组顺序排序好的缓存数组 
				let symbolCache = Object.assign([],this.selectedSymbol);
				// 跳过当前属性组
				if(groupIndex === idx) return false;
				// 遍历其他选项组中的选项
				group.attributes.forEach( item => {
					// 根据选项组下标，补位选项属性
					symbolCache[idx] = item.symbol;
					const reg = new RegExp(symbolCache.join(','));
					// 根据补位选项寻找是否有有效SKU，有则可选，没有则禁用
					const res = this.skuInfo.filter(i => reg.test(i.attributeSymbolList)).find(i => i.stock > 0);
					if(res){
						item.disabled = false;
					}else{
						item.disabled = true;
					}
				})
			})
		},
		/**
		 * 加入购物车
		 */
		async addCart(){
			if(!this.curSku.skuId){
				uni.$u.toast('请选择规格~');
				return false;
			}
			const {error, result} = await ApiPutAddCart({
				productSkuId : this.curSku.skuId,
				productId : this.goodsInfo.id,
				number : this.curBuyNum
			});
			if(error){
				uni.$u.toast(error.message);
				return false;
			}
			uni.$u.toast('加入购物车成功~');
			this.close();
			// this.$Router.push('/cart');
		},
		/**
		 * 立即购买
		 */
		buyNow(){
			if(!this.curSku.skuId){
				uni.$u.toast('请选择规格~');
				return false;
			}
			let query = {
				mode : 'buyNow',
				skuId : this.curSku.skuId,
				num : this.curBuyNum,
				activityType : 1
			}
			const {productActivityVO} = this.goodsInfo;
			if(this.activityStatus === 'startActivity'){
				query.activityType = 3;
				query.activityId = productActivityVO.activityId;
				query.activityTimeId = productActivityVO.activityTimeId;
			}
			this.$Router.push({
				path : '/orderSubmit',
				query
			})
		},
		confirm(){
			if(this.mode == 2){
				this.addCart();
			}
			if(this.mode == 3){
				this.buyNow();
			}
		},
		close(){
			this.$emit('update:visible', false);
		}
	}
};
</script>

<style lang="scss" scoped>
.sku-popup{
	padding: 30rpx;
}
.product-info{
	display: flex;
	font-size: $font-size-base;
	color: $color-grey4;
	line-height: 42rpx;
	&--img{
		width: 200rpx;
		height: 200rpx;
		margin-right: 40rpx;
	}
	&--price{
		font-size: 40rpx;
		color: $color-yellow4;
		line-height: 48rpx;
		margin-bottom: 20rpx;
	}
}
.attr-group{
	margin-top: 40rpx;
	font-size: 30rpx;
}
.attr-items{
	display: flex;
	flex-wrap: wrap;
	padding: 10rpx 0;
}
.attr-item{
	background: $color-grey1;
	line-height: 70rpx;
	border-radius: 100rpx;
	border: 1px solid $color-grey1;
	color: $color-grey5;
	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: $color-yellow4;
		color: $color-yellow3;
	}
	&__disabled{
		color: $color-grey3;
	}
}
.sku-num{
	display: flex;
	justify-content: space-between;
	margin: 40rpx 0;
	line-height: 40rpx;
	&--single-box{
		display: flex;
		align-items: center;
	}
	&--single{
		color: $color-grey4;
		margin-left: 10rpx;
		font-size: $font-size-base;
		display: block;
		height: 30rpx;
	}
}
.footer{
	display: flex;
	justify-content: space-between;
	.btn-bg{
		background: #FFE6D9;
		border-radius: 50rpx;
		height: 80rpx;
	}
	.btn{
		border: 0;
		padding: 0;
		border-radius: 0;
		width: 340rpx;
		font-size: $font-size-base;
		color: $color-yellow3;
		&::after{
			border: 0;
		}
		&__buy{
			width: 350rpx;
			background: url('@/static/goods/buy_max.png');
			background-size: 350rpx;
			color: $color-grey0;
		}
	}

	.btn__confirm{
		margin: 0;
		width: 670rpx;
	}
}
</style>
