<template>
	<view class="customBox">
		<scroll-view scroll-y="true" class="contentBox" @scrolltolower="scorllBottom" :scroll-top="topNum">
			<view class="content">
				<view class="left">
					<template v-for="(item, index) in list" :key="item.id">
						<view class="row" @click="toPage(item.id)" v-if="index % 2 == 0">
							<view class="img">
								<image :src="item.explain_video + '?x-oss-process=video/snapshot,t_1000,m_fast'" mode="widthFix"></image>
								<view class="icon"><up-icon name="play-right-fill" size="14" color="#fff" /></view>
							</view>
							<view class="desc">{{item.description}}</view>
							<view class="num">{{item.visitor}}人看过 | {{item.order_count}}人跟团</view>
						</view>
					</template>
				</view>
				<view class="left">
					<template v-for="(item, index) in list" :key="item.id">
						<view class="row" @click="toPage(item.id)" v-if="index % 2 == 1">
							<view class="img">
								<image :src="item.explain_video + '?x-oss-process=video/snapshot,t_1000,m_fast'" mode="widthFix"></image>
								<view class="icon"><up-icon name="play-right-fill" size="14" color="#fff" /></view>
							</view>
							<view class="desc">{{item.description}}</view>
							<view class="num">{{item.visitor}}人看过 | {{item.order_count}}人跟团</view>
						</view>
					</template>
				</view>
			</view>
			
			<view class="noMore" v-if="list.length && !has_more && !loading">— 没有更多了 —</view>
			<view v-if="!list.length && !loading">
				<up-empty mode="list" icon="https://ct-upimg.yx090.com/g.ii090/images/sprite/empty/list.png" text="暂无数据"></up-empty>
			</view>
			<view v-if="loading" class="loadbox">
				<up-loading-icon text="加载中..." textSize="14"></up-loading-icon>
			</view>
		</scroll-view>
		
		<!-- 返回顶部 -->
		<view @click="handleTop" v-if="showTop" class="top">
			<up-icon name="arrow-upward" color="#000" size="24" />
		</view>
	</view>
</template>

<script>
	import { ref, reactive, toRefs, onMounted } from 'vue'
	import { get } from '@/api/request.js'
	
	export default {
		options: {
			styleIsolation: 'shared'
		},
		props: {
		},
		setup(props, context) {
			const data = reactive({
				topNum: 0,
				showTop: false,
				last_id: 0,
				loading: true,
				has_more: true,
				list: []
			})
			
			async function getFetchList() {
				data.loading = true
				uni.showLoading({
					title: '加载中...',
					mask: true
				})
				let params = {
					last_id: data.last_id,
					pageSize: 20
				}
				await get('/api/app/goods/videos', params).then((res) => {
					data.list = data.list.concat(res.data)
					data.last_id = res.last_id
					data.has_more = res.has_more
					data.loading = false
					uni.hideLoading()
				}).catch(() => {
					data.loading = false
				})
			}
			
			function scorllBottom() {
				if (data.has_more && !data.loading) {
					getFetchList()
				}
			}
			
			function toPage(id) {
				uni.navigateTo({
					url: '/pages/groups/video?id=' + id
				})
			}
			
			const handleTop = () => {
				data.topNum = data.topNum == 0 ? 0.1 : 0
			}
			
			onMounted(() => {
				getFetchList()
			})
			
			return {
				...toRefs(data),
				getFetchList,
				scorllBottom,
				handleTop,
				toPage
			}
			
		},
		onPageScroll(e) {
			if (e.scrollTop > 300) {
				this.showTop = true
			} else {
				this.showTop = false
			}
		},
	}
</script>

<style lang="scss" scoped>
	.customBox{
		padding: 0 0 1rpx;
		height: calc(100vh - 242rpx);
		box-sizing: border-box;
		.contentBox{
			height: 100%;
			overflow-y: auto;
			position: relative;
		}
		.content{
			padding: 24rpx 1.5%;
			box-sizing: border-box;
			display: flex;
			flex-wrap: wrap;
			.left{
				width: 50%;
				padding: 0 1.5%;
				box-sizing: border-box;
			}
			.row{
				background-color: #fff;
				border-radius: 10rpx;
				width: 100%;
				margin-bottom: 24rpx;
				overflow: hidden;
				.img{
					width: 100%;
					position: relative;
					image{
						width: 100%;
						height: auto;
					}
					.icon{
						position: absolute;
						top: 20rpx;
						right: 20rpx;
						background-color: rgba(0,0,0,0.5);
						border-radius: 50%;
						width: 26px;
						height: 26px;
						display: flex;
						align-items: center;
						justify-content: center;
					}
				}
				.desc{
					font-size: 28rpx;
					overflow: hidden !important;
					text-overflow: ellipsis !important;
					display: -webkit-box !important;
					-webkit-line-clamp: 2 !important;
					-webkit-box-orient: vertical !important;
					white-space: break-spaces !important;
					padding: 0 20rpx;
					margin: 10rpx 0;
				}
				.num{
					font-size: 24rpx;
					padding: 10rpx 20rpx 20rpx;
					color: #999;
				}
			}
		}
		.noMore{
			text-align: center;
			font-size: 24rpx;
			color: #999;
			margin: auto;
			padding: 0 0 60rpx;
			width: 100%;
		}
		.noMsg{
			width: 100%;
			height: 100vh;
			display: flex;
			align-items: center;
			flex-direction: column;
			padding-top: 20%;
			box-sizing: border-box;
			font-size: 26rpx;
			color: #9D9D9D;
		}
		.loadbox{
			padding: 30rpx 0;
			text-align: center;
			color: #666;
		}
		.top {
			position: fixed;
			bottom: 15%;
			right: 5%;
			background: #fff;
			width: 80rpx;
			height: 80rpx;
			border-radius: 50%;
			display: flex;
			align-items: center;
			justify-content: center;
			box-shadow: 0 2px 10px 0 rgba(0, 0, 0, 0.2);
			z-index: 2;
		}
	}
</style>
