zh_order_food_xcx/utils/cartStore.js

class CartStore {
	constructor() {
		this.storageKey = 'shopping_cart';
		this.currentShopId = ''; // 当前店铺ID
	}

	// 设置当前店铺ID
	setShopId() {
		this.currentShopId = uni.getStorageSync('shop_id');
	}

	// 获取购物车数据
	getCart() {
		try {
			const cartStr = uni.getStorageSync(this.storageKey);
			if (!cartStr) {
				return {};
			}
			return JSON.parse(cartStr);
		} catch (e) {
			console.error('获取购物车失败:', e);
			return {};
		}
	}

	// 保存购物车数据
	saveCart(cartData) {
		try {
			uni.setStorageSync(this.storageKey, JSON.stringify(cartData));
		} catch (e) {
			console.error('保存购物车失败:', e);
		}
	}

	// 获取指定店铺的购物车
	getShopCart(shopId = null) {
		const cart = this.getCart();
		const targetShopId = shopId || this.currentShopId;
		if (!targetShopId) return null;

		if (!cart[targetShopId]) {
			cart[targetShopId] = {
				total_price: 0, //所有价格总和
				total_num: 0,
				goods_list: [],
				pack_price: 0, //配送费总额
				total_goods_money: 0, //商品价格总额
				shop_info: null
			};
			this.saveCart(cart);
		}

		return cart[targetShopId];
	}

	// 添加商品到购物车
	addToCart(goods, goodsSpec = [], quantity = 1) {
		if (!this.currentShopId) {
			console.error('未设置店铺ID');
			return false;
		}

		const cart = this.getCart();
		if (!cart[this.currentShopId]) {
			cart[this.currentShopId] = {
				total_price: 0,
				total_num: 0,
				goods_list: [],
				pack_price: 0, //配送费总额
				total_goods_money: 0, //商品价格总额
				shop_info: null
			};
		}

		const shopCart = cart[this.currentShopId];

		// 生成商品唯一标识（结合商品ID和规格ID）
		const specIdStr = goodsSpec.length > 0 ?
			goodsSpec.map(spec => `${spec.id}_${spec.number}`).sort().join('_') :
			'no_spec';

		const goodsKey = `${goods.goods_id}_${specIdStr}`;

		// 计算商品单价
		const unitPrice = this.calculatePrice(goods, goodsSpec);

		// 获取商品配送费
		const packPrice = parseFloat(goods.pack_price || 0);

		// 查找是否已存在相同商品
		const existingIndex = shopCart.goods_list.findIndex(
			item => this.getGoodsKey(item) === goodsKey
		);

		if (existingIndex > -1) {
			// 已存在，更新数量
			shopCart.goods_list[existingIndex].goods_number += quantity;
		} else {
			// 新商品，添加到列表
			shopCart.goods_list.push({
				goods_id: goods.goods_id,
				goods_name: goods.goods_name || '',
				goods_image: goods.goods_image || '',
				// price: this.calculatePrice(goods, goodsSpec),
				price: unitPrice,
				pack_price: packPrice, // 单个商品配送费
				goods_number: quantity,
				goods_attr: this.getSpecAttr(goodsSpec),
				goods_spec: goodsSpec,
				category_id: goods.category_id,
				goods_desc: goods.goods_desc || '',
				spec_type: goods.spec_type || 1
			});
		}

		// 重新计算总计
		this.calculateTotals(shopCart);

		// 保存到本地存储
		this.saveCart(cart);

		return true;
	}

	// 更新商品数量
	updateQuantity(goodsId, goodsSpec = [], quantity) {
		if (!this.currentShopId) return false;

		const cart = this.getCart();
		const shopCart = cart[this.currentShopId];
		if (!shopCart) return false;

		const specIdStr = goodsSpec.length > 0 ?
			goodsSpec.map(spec => `${spec.id}_${spec.number}`).sort().join('_') :
			'no_spec';

		const goodsKey = `${goodsId}_${specIdStr}`;

		const goodsIndex = shopCart.goods_list.findIndex(
			item => this.getGoodsKey(item) === goodsKey
		);

		if (goodsIndex > -1) {
			if (quantity <= 0) {
				// 数量为0，移除商品
				shopCart.goods_list.splice(goodsIndex, 1);
			} else {
				// 更新数量
				shopCart.goods_list[goodsIndex].goods_number = quantity;
			}

			// 重新计算总计
			this.calculateTotals(shopCart);
			this.saveCart(cart);
			return true;
		}

		return false;
	}

	// 从购物车移除商品
	removeFromCart(goodsId, goodsSpec = []) {
		return this.updateQuantity(goodsId, goodsSpec, 0);
	}

	// 清空当前店铺购物车
	clearCurrentShopCart() {
		if (!this.currentShopId) return false;

		const cart = this.getCart();
		cart[this.currentShopId] = {
			total_price: 0,
			total_num: 0,
			goods_list: [],
			pack_price: 0,
			total_goods_money: 0,
			shop_info: null
		};

		this.saveCart(cart);
		return true;
	}

	// 计算商品价格
	calculatePrice(goods, goodsSpec = []) {
		let price = goods.seckill_money > 0 ? Number(goods.seckill_money) : Number(goods.price);
		// 如果有规格，累加规格价格
		if (goodsSpec.length > 0) {
			goodsSpec.forEach(spec => {
				// 这里需要根据实际情况获取规格价格
				// 假设规格信息中包含价格
				if (spec.price) {
					price += Number(spec.price) * (spec.number || 1);
				}
			});
		}

		return Number(price).toFixed(2);
	}

	// 获取规格描述
	getSpecAttr(goodsSpec = []) {
		if (goodsSpec.length === 0) return '';
		return goodsSpec.map(spec => spec.name || '').join('、');
	}

	// 生成商品唯一键
	getGoodsKey(goodsItem) {
		const specIdStr = goodsItem.goods_spec && goodsItem.goods_spec.length > 0 ?
			goodsItem.goods_spec.map(spec => `${spec.id}_${spec.number}`).sort().join('_') :
			'no_spec';

		return `${goodsItem.goods_id}_${specIdStr}`;
	}

	// 计算购物车总计
	calculateTotals(shopCart) {
		// let total_price = 0;
		let total_goods_money = 0; // 商品总额（不含配送费）
		let total_pack_price = 0; // 配送费总额
		let total_num = 0;

		// 计算商品总额和总数量
		shopCart.goods_list.forEach(item => {
			const itemGoodsMoney = item.price * item.goods_number; // 商品金额
			const itemPackPrice = parseFloat(item.pack_price || 0) * item.goods_number; // 配送费金额
			const itemTotal = item.price * item.goods_number;
			// total_goods_money += itemTotal;
			// total_num += item.goods_number;
			total_goods_money += itemGoodsMoney;
			total_pack_price += itemPackPrice;
			total_num += item.goods_number;
		});

		// 更新商品总额
		shopCart.total_goods_money = parseFloat(total_goods_money.toFixed(2));

		// 更新配送费总额
		shopCart.pack_price = parseFloat(total_pack_price.toFixed(2));

		// 更新商品总数量
		shopCart.total_num = total_num;

		// 计算总价：商品总额 + 配送费
		const total_price = shopCart.total_goods_money + (shopCart.pack_price || 0);
		shopCart.total_price = parseFloat(total_price.toFixed(2));

		// shopCart.goods_list.forEach(item => {
		// 	total_price += item.price * item.goods_number;
		// 	total_num += item.goods_number;
		// });

		// shopCart.total_price = parseFloat(total_price.toFixed(2));
		// shopCart.total_num = total_num;
	}

	// 获取商品在购物车中的数量
	getGoodsQuantity(goodsId, goodsSpec = []) {
		if (!this.currentShopId) return 0;

		const cart = this.getCart();
		const shopCart = cart[this.currentShopId];
		if (!shopCart) return 0;

		const specIdStr = goodsSpec.length > 0 ?
			goodsSpec.map(spec => `${spec.id}_${spec.number}`).sort().join('_') :
			'no_spec';

		const goodsKey = `${goodsId}_${specIdStr}`;

		const goodsItem = shopCart.goods_list.find(
			item => this.getGoodsKey(item) === goodsKey
		);

		return goodsItem ? goodsItem.goods_number : 0;
	}

	// 获取指定店铺购物车中某商品的总数量（所有规格合并）
	getGoodsTotalQuantity(goodsId) {
		if (!this.currentShopId) return 0;

		const cart = this.getCart();
		const shopCart = cart[this.currentShopId];
		if (!shopCart) return 0;

		let total = 0;
		shopCart.goods_list.forEach(item => {
			if (item.goods_id === goodsId) {
				total += item.goods_number;
			}
		});

		return total;
	}

	// 获取购物车统计数据
	getCartStats(shopId = null) {
		const shopCart = this.getShopCart(shopId);
		if (!shopCart) {
			return {
				total_price: 0,
				total_num: 0,
				goods_list: [],
				pack_price: 0,
				total_goods_money: 0
			};
		}

		return {
			total_price: shopCart.total_price || 0,
			total_num: shopCart.total_num || 0,
			goods_list: shopCart.goods_list || [],
			pack_price: shopCart.pack_price || 0,
			total_goods_money: shopCart.total_goods_money || 0
		};
	}

	// 获取商品总额（不含配送费）
	getGoodsTotalMoney(shopId = null) {
		const shopCart = this.getShopCart(shopId);
		return shopCart ? (shopCart.total_goods_money || 0) : 0;
	}

	// 获取配送费
	getPackPrice(shopId = null) {
		const shopCart = this.getShopCart(shopId);
		return shopCart ? (shopCart.pack_price || 0) : 0;
	}

	// 获取总价（商品总额+配送费）
	getTotalPrice(shopId = null) {
		const shopCart = this.getShopCart(shopId);
		return shopCart ? (shopCart.total_price || 0) : 0;
	}
	// 获取单个商品在购物车中的信息
	getGoodsInfo(goodsId, goodsSpec = []) {
		if (!this.currentShopId) return null;

		const cart = this.getCart();
		const shopCart = cart[this.currentShopId];
		if (!shopCart) return null;

		const specIdStr = goodsSpec.length > 0 ?
			goodsSpec.map(spec => `${spec.id}_${spec.number}`).sort().join('_') :
			'no_spec';

		const goodsKey = `${goodsId}_${specIdStr}`;

		return shopCart.goods_list.find(
			item => this.getGoodsKey(item) === goodsKey
		);
	}
}

// 创建单例
const cartStore = new CartStore();
export default cartStore;