<template>
	<s-layout title="购物车" tabbar="/pages/index/cart" :bgStyle="{ color: '#fff' }">
		<s-empty
			v-if="state.list.length === 0"
			text="购物车空空如也,快去逛逛吧~"
			icon="/static/cart-empty.png"
		/>

		<!-- 头部 -->
		<view class="cart-box ss-flex ss-flex-col ss-row-between" v-if="state.list.length">
			<view class="cart-header ss-flex ss-col-center ss-row-between ss-p-x-30">
				<view class="header-left ss-flex ss-col-center ss-font-26">
					共
					<text class="goods-number ui-TC-Main ss-flex">
						{{ state.list.length }}
					</text>
					件商品
				</view>
				<view class="header-right">
					<button
						v-if="state.editMode"
						class="ss-reset-button"
						@tap="onChangeEditMode(false)"
					>
						取消
					</button>
					<button v-else class="ss-reset-button ui-TC-Main" @tap="onChangeEditMode(true)">
						编辑
					</button>
				</view>
			</view>
			<!-- 内容 -->
			<view class="cart-content ss-flex-1 ss-p-x-30 ss-m-b-40">
				<view class="goods-box ss-r-10 ss-m-b-14" v-for="item in state.list" :key="item.id">
					<view class="ss-flex ss-col-center">
						<label
							class="check-box ss-flex ss-col-center ss-p-l-10"
							@tap="onSelectSingle(item.id)"
						>
							<radio
								:checked="state.selectedIds.includes(item.id)"
								color="var(--ui-BG-Main)"
								style="transform: scale(0.8)"
								@tap.stop="onSelectSingle(item.id)"
							/>
						</label>
						<view v-if="item.status === 'down' && !state.editMode" class="down-box">
							该商品已下架
						</view>
						<s-goods-item
							:title="item.goods.title"
							:img="item.sku_price.image || item.goods.image"
							:price="item.sku_price.price"
							:skuText="item.sku_price.goods_sku_text"
							priceColor="#FF3000"
							:titleWidth="400"
						>
							<template v-if="!state.editMode" v-slot:tool>
								<su-number-box
									:min="0"
									:max="item.sku_price.stock"
									:step="1"
									v-model="item.goods_num"
									@change="onNumberChange($event, item)"
								></su-number-box>
							</template>
						</s-goods-item>
					</view>
				</view>
			</view>
			<!-- 底部 -->
			<su-fixed bottom :val="48" placeholder v-if="state.list.length > 0" :isInset="false">
				<view
					class="cart-footer ss-flex ss-col-center ss-row-between ss-p-x-30 border-bottom"
				>
					<view class="footer-left ss-flex ss-col-center">
						<label class="check-box ss-flex ss-col-center ss-p-r-30" @tap="onSelectAll">
							<radio
								:checked="state.isAllSelected"
								color="var(--ui-BG-Main)"
								style="transform: scale(0.8)"
								@tap.stop="onSelectAll"
							/>
							<view class="ss-m-l-8"> 全选 </view>
						</label>
						<text>合计：</text>
						<view class="text-price price-text">
							{{ state.totalPriceSelected }}
						</view>
					</view>
					<view class="footer-right">
						<button
							v-if="state.editMode"
							class="ss-reset-button ui-BG-Main-Gradient pay-btn ui-Shadow-Main"
							@tap="onDelete"
						>
							删除
						</button>
						<button
							v-else
							class="ss-reset-button ui-BG-Main-Gradient pay-btn ui-Shadow-Main"
							@tap="onConfirm"
						>
							去结算
							{{ state.selectedIds?.length ? `(${state.selectedIds.length})` : '' }}
						</button>
					</view>
				</view>
			</su-fixed>
		</view>
	</s-layout>
</template>

<script setup>
	import sheep from '@/sheep';
	import { computed, reactive, unref } from 'vue';
	import { onShow } from '@dcloudio/uni-app';

	const sys_navBar = sheep.$platform.navbar;
	const cart = sheep.$store('cart');

	const state = reactive({
		editMode: false,
		list: computed(() => cart.list),
		selectedList: [],
		selectedIds: computed(() => cart.selectedIds),
		isAllSelected: computed(() => cart.isAllSelected),
		totalPriceSelected: computed(() => cart.totalPriceSelected),
	});

	// 单选选中
	function onSelectSingle(id) {
		cart.selectSingle(id);
	}

	// 编辑、取消
	function onChangeEditMode(flag) {
			state.editMode = flag
	}

	// 全选
	function onSelectAll() {
		cart.selectAll(!state.isAllSelected);
	}

	// 结算
	function onConfirm() {
		let goods_list = [];
		state.selectedList = state.list.filter((item) => state.selectedIds.includes(item.id));
		state.selectedList.map((item) => {
			goods_list.push({
				goods_id: item.goods_id,
				goods_num: item.goods_num,
				goods_sku_price_id: item.goods_sku_price_id,
			});
		});
		if (goods_list.length === 0) {
			sheep.$helper.toast('请选择商品');
			return;
		}
		sheep.$router.go('/pages/order/confirm', {
			data: JSON.stringify({
				order_type: 'goods',
				goods_list,
				from: 'cart',
			}),
		});
	}

	function onNumberChange(e, cartItem) {
		if (e === 0) {
			cart.delete(cartItem.id);
			return;
		}
		if (cartItem.goods_num === e) return;
		cartItem.goods_num = e;
		cart.update({
			goods_id: cartItem.goods_id,
			goods_num: e,
			goods_sku_price_id: cartItem.goods_sku_price_id,
		});
	}
	function onDelete() {
		cart.delete(state.selectedIds);
	}

	function getCartList() {
		cart.getList();
	}

	onShow(() => {
		state.editMode = false;
		getCartList();
	});
</script>

<style lang="scss" scoped>
	:deep(.ui-fixed) {
		height: 72rpx;
	}

	.cart-box {
		width: 100%;

		.cart-header {
			height: 70rpx;
			background-color: #f6f6f6;
			width: 100%;
			position: fixed;
			left: 0;
			top: v-bind('sys_navBar') rpx;
			z-index: 1000;
			box-sizing: border-box;
		}

		.cart-footer {
			height: 100rpx;
			background-color: #fff;

			.pay-btn {
				width: 180rpx;
				height: 70rpx;
				font-size: 28rpx;
				line-height: 28rpx;
				font-weight: 500;
				border-radius: 40rpx;
			}
		}

		.cart-content {
			margin-top: 70rpx;
			.goods-box {
				background-color: #fff;
				position: relative;
			}
			// 下架商品
			.down-box {
				position: absolute;
				left: 0;
				top: 0;
				width: 100%;
				height: 100%;
				background: rgba(#fff, 0.8);
				z-index: 2;
				display: flex;
				justify-content: center;
				align-items: center;
				color: #999;
				font-size: 32rpx;
			}
		}
	}
</style>
