<template>
	<view class="u-wrap">
		<view class="search">
			<view class="status_bar" style="z-index: -1;position: relative;"></view>
			<view class="search1" style="z-index: 11;position: relative;">
				<view class="search1_img" @click="gotoindex()"><image src="/static/icon/home_white.png" mode=""></image></view>
				<navigator url="/pages/index/search">
					<view class="navigation_seach">
							<image src="../../static/img/seach.png" mode=""></image>
							<text>search</text>
					</view>
				</navigator>
				<view class="navigation_title_right">
					<navigator url="/pages/account/wishlist">
						<image src="../../static/img/like_white.png" mode=""></image>
					</navigator>
					<navigator url="/pages/shippingCart/index" open-type="switchTab">
						<uni-badge :text="sum" type="error" absolute="rightTop">
							<image src="../../static/img/shop_cart1.png" mode=""></image>
						</uni-badge>  
					</navigator>
				</view>
			</view>
			
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view category_left" :scroll-top="scrollTop"
			 :scroll-into-view="itemId">
				<view v-for="(item,index) in categoryList" :key="item.cat_name" class="u-tab-item" :class="[current == index ? 'u-tab-item-active' : '']"
				 @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.cat_name}}</text>
				</view>
			</scroll-view>
			<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box" @scroll="rightScroll">
				<view class="page-view">
					<view class="class-item" :id="'item' + index" v-for="(item , index) in categoryList" :key="item.cat_name">
						<view class="item-title">
							<text>{{item.cat_name}}</text>
						</view>
						<view class="good_content">
							<view class="good_item" v-for="(item1, index1) in item.subcategories" :key="index1">
								<view @click="toDetial(item1)">
									<view class="good_item_img"><image :src="item1.first_goods_thumb" alt=""></view>
								</view>
								<text>{{item1.cat_name}}</text>
								
							</view>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
		<view class="tarbar">
			<view  @click="change(index)" v-for="(item,index) in tarbar" :key="item.name" :class="index==2?'img_m':'tarbar_img'":style="{color:index==1?'#000':''}">
				<image :src="item.src"></image>
				<view>{{ item.name}}</view>
			</view>
		</view>
	</view>
</template>
<script>
	import {defaultRequest,defaultRequest4} from '../../api/index.js'
	export default {
		data() {
			return {
				scrollTop: 0, //tab标题的滚动条位置
				oldScrollTop: 0,
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				itemId: '', // 栏目右边scroll-view用于滚动的id
				tabbar: [],
				menuItemPos: [],
				arr: [],
				scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度
				timer: null, // 定时器
				categoryList:[],
				sum:0,
				backButtonPress:0,
				homeIndex: 0,
				tarbar:[
					{
						src:'../../static/icon/home3.png',
						name:'Home',
						url:'../index/index'
					},
					{
						src:'../../static/img/Category1.png',
						name:'Category',
						url:'../category/index'
					},
					{
						src:'../../static/img/min.png',
						name:'',
						url:'../index/index2'
					},
					{
						src:'../../static/img/Cart.png',
						name:'Cart',
						url:'../shippingCart/index'
					},
					{
						src:'../../static/img/Account.png',
						name:'Account',
						url:'../account/index'
					},
				],
				list2:[
					{src:'../../static/icon/home4.png'},
					{src:'../../static/img/Category1.png'},
					{src:''},
					{src:'../../static/img/cart1.png'},
					{src:'../../static/img/Account1.png'}
				],
			}
		},
		onShow() {
			// this.tarbar[2].src = uni.getStorageSync('midButton')
			this.sum =0
			this.getList()
			this.getCartNum()
			uni.hideTabBar()
			
		},
		onLoad() {
			
			this.getList()
			this.getCartNum()
			uni.hideTabBar()
		},
		onReady() {
			this.getMenuItemTop()
		},
		onBackPress(options) {
			this.backButtonPress++;
			if (this.backButtonPress > 1) { 
				plus.runtime.quit();
			} else {
				plus.nativeUI.toast('Click again to exit');
			} 
			setTimeout(function() {
				this.backButtonPress = 0;
			}, 1000);
			return true;
					},
    
		methods: {
          change(e){
          	 this.index = e
          	 let tarbar = this.tarbar
			 uni.hideTabBar()
          	if(e!==2){
          		uni.switchTab({
          			url:this.tarbar[e].url
          		})
          	}else{
          		uni.navigateTo({
          			url:this.tarbar[e].url
          		})
          	}
          },
		
			// 点击左边的栏目切换
			async swichMenu(index) {
				if(this.arr.length == 0) {
					await this.getMenuItemTop();
				}
				if ( this.current === index) return;
				
				// this.scrollRightTop = this.oldScrollTop;
				this.scrollRightTop = this.arr[index];
				// this.$nextTick(function(){
					// this.scrollRightTop = this.arr[index];
				    this.current = index;
					// this.leftMenuStatus(index);
					
				// })
			},
			getCartNum(){
				let data={_action:'getcartgoods'}
				defaultRequest(data).then(res=>{
					console.info(res)
					if(res.error==0){
						 this.sum = res.data.goods_list.length
						 console.log(this.sum,'////')
						 // uni.setStorageSync('cartSum',this.sum)
					}
				})
			},
			toDetial(item){
				console.log(item)
				uni.navigateTo({
					url:"../category/productList?typethree="+item.cat_id+'&type=0'+'&title='+item.cat_name
				})
			},
			getList(){
				let data={_action:'getcategorytree'}
				defaultRequest(data).then(res=>{
					console.info(res)
					if(res.error==0){
						this.categoryList=res.data
						console.log(res.data,'////')
						this.categoryIndex=res.data[0].cat_id
					}
				})
				// 获取tarbar中间
				let data2={_action:'getpagedata',pagecode:'HOMESALEICON '}
				defaultRequest(data2).then(res => {
					console.log(res)
					let url
					if(res.error == 0){
						if(res.data.page_code == 'HOMESALEICON'){
							let src = 'https://www.dopeplus.com/images/mapp_customized/202210/1665653173499940520.png'
							if(src==res.data.zones[0].blocks[0].block_pic){
								this.tarbar[2].src = '../../static/img/min.png'
							}else{
								src=res.data.zones[0].blocks[0].block_pic
								// this.tabar[2].src=src
								this.tarbar[2].src = res.data.zones[0].blocks[0].block_pic
								uni.setStorageSync('midButton',src)
							}
							
						}
					}
				});
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
						resolve();
					}).exec();
				})
			},
			// 观测元素相交状态
			async observer() {
				this.tabbar.map((val, index) => {
					let observer = uni.createIntersectionObserver(this);
					// 检测右边scroll-view的id为itemxx的元素与right-box的相交状态
					// 如果跟.right-box底部相交，就动态设置左边栏目的活动状态
					observer.relativeTo('.right-box', {
						top: 0
					}).observe('#item' + index, res => {
						
						if (res.intersectionRatio > 0) {
							let id = res.id.substring(4);
							this.leftMenuStatus(id);
						}
					})
				})
			},
			// 设置左边菜单的滚动状态
			async leftMenuStatus(index) {
				 
				 
				 // console.log(index,'index')
				 if (index == this.current) return;
				this.current = index
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
					
				}
				// 将菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
			},
			// 获取右边菜单每个item到顶部的距离
			getMenuItemTop() {
				new Promise(resolve => {
					let selectorQuery = uni.createSelectorQuery();
					selectorQuery.selectAll('.class-item').boundingClientRect((rects) => {
						// 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
						if(!rects.length) {
							setTimeout(() => {
								this.getMenuItemTop();
							}, 10);
							return ;
						}
						rects.forEach((rect) => {
							// 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
							this.arr.push(rect.top - rects[0].top);
							resolve();
						})
					}).exec()
				})
			},
			// 右边菜单滚动
			async rightScroll(e) {
				// this.current = 0
				this.oldScrollTop = e.detail.scrollTop;
				// if(this.arr.length == 0) {
				// 	await this.getMenuItemTop();
				// }
				
				if(this.timer) return ;
				if(!this.menuHeight) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
				}
				setTimeout(() => { // 节流
					this.timer = null;
					// scrollHeight为右边菜单垂直中点位置
					let scrollHeight = e.detail.scrollTop + this.menuHeight / this.categoryList.length;
					for (let i = 0; i < this.arr.length; i++) {
						let height1 = this.arr[i];
						let height2 = this.arr[i + 1];
						// this.scrollRightTop = this.arr[i];
						// 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
						if (!height2 || scrollHeight >=height1 && scrollHeight < height2) {
							
							this.leftMenuStatus(i);
							
							return ;
						}
						
					}
				}, 10)
			},
			gotoindex(){
				uni.switchTab({
					url:'../index/index'
				})
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}
	.search{
		width: 100%;
		background-color:#000;
		box-sizing: border-box;
		// padding: 33.33rpx 26.67rpx;
		padding: 8px 15px;
		
		position: fixed;
		top: 0;
		z-index: 99;
	   // border-bottom: 1px solid #F5F6FA;
		
		.search1{
			display: flex;
			align-items: center;
			justify-content: space-between;
			.search1_img{
				height:56rpx;
				width: 50rpx;
				// background-color: #fff;
				margin:0 10rpx 0 10rpx;
				image{
					height: 100%;
					width: 100%;
				}
			}
			.navigation_seach{
				// width: 546.67rpx;
				width: 480rpx;
				background-color: #F5F6FA;
				border-radius: 6.67rpx;
				height: 56.67rpx;
				display: flex;
				align-items: center;
				color: #8F9094;
				margin-right:20rpx;
				border-radius: 33rpx;
				font-size: 26.67rpx;
				padding-left: 25rpx;
				box-sizing: border-box;
				
				image{
					width: 29.33rpx;
					height: 29.33rpx;
					margin-right: 22rpx;
				}
			}
			.navigation_title_right{
				display: flex;
				align-items: center;
				
				image{
					width: 44rpx;
					height: 44rpx;
				}
				>uni-navigator:first-child{
					margin-right: 32.67rpx;
				}
			}
			
		}
		
	}

  .u-menu-wrap {
  	flex: 1;
	height: 100%;
  	display: flex;
  	overflow: hidden;
	// margin-top: 166rpx;
	margin-top: 68px;
  }
  .category_left{
  	height: 100%;
  	// background-color: #F5F6FA;
  	width: 197.33rpx;
	
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		width: 197.33rpx;
		padding: 0 18rpx;
		height: 94rpx;
		font-size: 28.67rpx;
		font-weight: bold;
		
		box-sizing: border-box;
		font-family: PingFang SC;
		white-space: nowrap;
		display: flex;
		align-items: center;
		word-wrap: break-word;
		word-break: break-all;
	}

	.u-tab-item-active {
		position: relative;
		// font-size: 26rpx;
		font-size: 28.67rpx;
		font-weight: 600;
		background-color: black;
		color: white;
	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		padding: 16rpx;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}

	.class-item:last-child {
		min-height: 100vh;
	}

	.item-title {
		font-size: 26rpx;
		font-weight: bold;
		margin-bottom: 20rpx;
	}

	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		// width: 33.333333%;
		width: 100%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
	.good_content{
		display: flex;
		flex-wrap: wrap;
		
		.good_item{
			font-size: 22.67rpx;
			text-align: center;
			margin-right: 25.33rpx;
			margin-bottom: 51.33rpx;
			
			.good_item_img{
				display: block;
				background-color: #999999;
				width: 146.67rpx;
				height: 146.67rpx;
				margin-bottom: 22rpx;
				border-radius: 10rpx;
				
			}
		}
		.good_item:nth-child(3n+3){
			margin-right: 0;
		}
	}
	.good_item_img{
		height: 100rpx;
		width: 100rpx;
		
		image{
			height: 100%;
			width: 100%;
			border-radius: 10rpx;
		}
	}
	.search .search1 .navigation_title_right uni-image {
		// margin-top: 8px;
		display: flex;
	    justify-content: center;
	    align-items: center;
	    margin: 0 auto;
	}
	.uni-badge--x {
		display: flex;
	}
	
</style>
