444 lines
12 KiB
JavaScript
444 lines
12 KiB
JavaScript
import {
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BigNumber
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} from "bignumber.js";
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import _ from "lodash";
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/**
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* 返回商品单价
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* @param goods 商品
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* @param user 用户信息
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* @param {Object} shopInfo
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*/
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export function returnGoodsPrice(goods, user, shopInfo) {
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if (goods.discount_sale_amount * 1 > 0) {
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return goods.discount_sale_amount;
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}
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if(shopInfo&&!shopInfo.isMemberPrice){
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return goods.salePrice;
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}
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if (user.isVip && goods.memberPrice * 1 <= goods.salePrice * 1 && goods.memberPrice * 1 > 0) {
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return goods.memberPrice;
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}
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return goods.salePrice;
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}
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/**
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* 返回商品分组
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* @param arr 商品列表
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*/
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export function returnGoodsGroupMap(arr) {
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let map = {};
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arr.forEach((v) => {
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const key = v.productId + "_" + v.skuId;
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if (!map[key]) {
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map[key] = [];
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}
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map[key].push(v);
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});
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return map;
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}
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/**
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* 优惠券类型：1-满减券，2-商品兑换券，3-折扣券，4-第二件半价券，5-消费送券，6-买一送一券，7-固定价格券，8-免配送费券
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* @param coupon
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*/
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export function returnCoupType(coupon) {
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const couponTypes = {
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1: "满减券",
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2: "商品券",
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3: "折扣券",
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4: "第二件半价券",
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5: "消费送券",
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6: "买一送一券",
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7: "固定价格券",
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8: "免配送费券",
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};
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return couponTypes[coupon.type] || "未知类型";
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}
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/**
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* 返回商品券抵扣后的商品列表
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* @param canDikouGoodsArr 可抵扣商品列表
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* @param selCoupon 已选择的优惠券列表
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* @param user 用户信息
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*/
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export function returnCanDikouGoodsArr(canDikouGoodsArr, selCoupon, user) {
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const goodsCouponGoods = selCoupon
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.filter((v) => v.type == 2)
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.reduce((prve, cur) => {
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prve.push(...cur.discount.hasDiscountGoodsArr);
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return prve;
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}, []);
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const arr = _.cloneDeep(canDikouGoodsArr)
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.map((v) => {
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const findCart = goodsCouponGoods.find((carts) => carts.id == v.id);
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if (findCart) {
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v.num -= findCart.num;
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}
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return v;
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})
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.filter((v) => v.num > 0);
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return arr;
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}
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/**
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* 判断优惠券是否可使用，并返回不可用原因
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*
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* @param {Object} args - 函数参数集合
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* @param {Array} args.canDikouGoodsArr - 可参与抵扣的商品列表
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* @param {Object} args.coupon - 优惠券信息对象
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* @param {boolean} args.coupon.use - 优惠券是否启用
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* @param {Array} args.coupon.useFoods - 优惠券适用的商品ID列表
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* @param {number} args.coupon.fullAmount - 优惠券使用门槛金额
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* @param {number} args.coupon.type - 优惠券类型
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* @param {number} args.goodsOrderPrice - 订单中所有商品的总金额
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* @param {Object} args.user - 用户信息对象
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* @param {Object} args.selCoupon - 已经选择的优惠券信息对象
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* @param {Object} args.shopInfo
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* @returns {Object} - { canUse: boolean, reason: string } 可用状态及不可用原因
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*/
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export function returnCouponCanUse(args) {
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let {
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canDikouGoodsArr,
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coupon,
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goodsOrderPrice,
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user,
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selCoupon,
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shopInfo
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} = args;
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// 优惠券未启用
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if (!coupon.use) {
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return {
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canUse: false,
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reason: "优惠券未启用"
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};
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}
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canDikouGoodsArr = returnCanDikouGoodsArr(canDikouGoodsArr, selCoupon, user,shopInfo);
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// 计算门槛金额
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let fullAmount = goodsOrderPrice;
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// 是否抵扣全部商品
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const isDikouAll = coupon.useFoods.length === 0;
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let canCalcGoodsArr = [];
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// 订单里参与门槛计算的商品
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if (!isDikouAll) {
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canCalcGoodsArr = canDikouGoodsArr.filter((v) => {
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return coupon.useFoods.find((food) => food.id == v.productId);
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});
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fullAmount = canCalcGoodsArr.reduce((pre, cur) => {
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return pre + returnGoodsPrice(cur, user,shopInfo) * cur.num;
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}, 0);
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}
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// 没有符合条件的商品
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if (!isDikouAll && canCalcGoodsArr.length === 0) {
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return {
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canUse: false,
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reason: "没有符合条件的商品"
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};
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}
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// 不满足门槛金额
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if (fullAmount < coupon.fullAmount) {
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return {
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canUse: false,
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reason: `满${coupon.fullAmount}元可用，当前可参与金额${fullAmount}元`
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};
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}
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// 商品券特殊验证
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if (coupon.type === 2) {
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if (!(isDikouAll || canCalcGoodsArr.length > 0)) {
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return {
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canUse: false,
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reason: "没有符合条件的商品可抵扣"
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};
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}
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}
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// 买一送一券特殊验证
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if (coupon.type === 6) {
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let canUse = false;
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if (isDikouAll) {
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canUse = canDikouGoodsArr.some((v) => v.num >= 2);
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} else if (canCalcGoodsArr.length > 0) {
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canUse = canCalcGoodsArr.some((v) => v.num >= 2);
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}
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if (!canUse) {
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return {
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canUse: false,
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reason: "需要购买至少2件相同的商品才能使用"
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};
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}
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}
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// 第二件半价券特殊验证
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if (coupon.type === 4) {
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let canUse = false;
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if (isDikouAll) {
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canUse = canDikouGoodsArr.some((v) => v.num >= 2);
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} else if (canCalcGoodsArr.length > 0) {
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canUse = canCalcGoodsArr.some((v) => v.num >= 2);
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}
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if (!canUse) {
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return {
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canUse: false,
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reason: "需要购买至少2件相同的商品才能使用"
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};
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}
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}
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// 所有条件都满足
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return {
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canUse: true,
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reason: ""
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};
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}
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/**
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* 计算抵扣商品金额
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* @param discountGoodsArr 可抵扣商品列表
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* @param discountNum 抵扣数量
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* @param user 用户信息
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* @param {Object} shopInfo 店铺信息
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*/
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export function calcDiscountGoodsArrPrice(discountGoodsArr, discountNum, user,shopInfo) {
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let hasCountNum = 0;
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let discountPrice = 0;
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let hasDiscountGoodsArr = [];
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for (let i = 0; i < discountGoodsArr.length; i++) {
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if (hasCountNum >= discountNum) {
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break;
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}
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const goods = discountGoodsArr[i];
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const shengyuNum = discountNum - hasCountNum;
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const num = Math.min(goods.num, shengyuNum);
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discountPrice += returnGoodsPrice(goods, user,shopInfo) * num;
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hasCountNum += num;
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hasDiscountGoodsArr.push({
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...goods,
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num
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});
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}
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return {
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discountPrice,
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hasDiscountGoodsArr
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};
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}
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/**
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* 计算优惠券抵扣金额
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* @param arr 可抵扣商品列表
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* @param coupon 优惠券
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* @param user 用户信息
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* @param goodsOrderPrice 商品订单金额
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* @param selCoupon 已选择的优惠券列表
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*/
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export function returnCouponDiscount(arr, coupon, user, goodsOrderPrice, selCoupon) {
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console.log('arr', arr);
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const canDikouGoodsArr = returnCanDikouGoodsArr(arr, selCoupon, user);
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console.log('canDikouGoodsArr', canDikouGoodsArr);
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if (coupon.type == 2) {
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return returnCouponProductDiscount(canDikouGoodsArr, coupon, user, goodsOrderPrice);
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}
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if (coupon.type == 6) {
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return returnCouponBuyOneGiveOneDiscount(canDikouGoodsArr, coupon, user, goodsOrderPrice);
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}
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if (coupon.type == 4) {
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return returnSecoendDiscount(canDikouGoodsArr, coupon, user, goodsOrderPrice);
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}
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if (coupon.type == 3) {
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return returnCouponZhekouDiscount(canDikouGoodsArr, coupon, user, goodsOrderPrice, selCoupon);
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}
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}
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/**
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* 折扣券抵扣金额
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* @param canDikouGoodsArr 可抵扣商品列表
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* @param coupon 优惠券
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* @param user 用户信息
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* @param goodsOrderPrice 商品订单金额
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* @param selCoupon 已选择的优惠券列表
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*
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*/
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export function returnCouponZhekouDiscount(
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canDikouGoodsArr,
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coupon,
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user,
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goodsOrderPrice,
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selCoupon
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) {
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const {
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discountRate,
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maxDiscountAmount
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} = coupon;
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const goodsCouponDiscount = selCoupon
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.filter((v) => v.type == 2)
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.reduce((prve, cur) => {
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return prve + cur.discount.discountPrice;
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}, 0);
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goodsOrderPrice -= goodsCouponDiscount;
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// 使用bignumber处理高精度计算
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// 1. 计算折扣率（百分比转小数）：discountRate / 100
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const discountRatio = new BigNumber(discountRate).dividedBy(100);
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// 2. 计算优惠比例：1 - 折扣率（例如：8折的优惠比例是 1 - 0.8 = 0.2）
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const discountAmountRatio = new BigNumber(1).minus(discountRatio);
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// 3. 计算折扣金额：商品订单金额 × 优惠比例
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let discountPrice = new BigNumber(goodsOrderPrice).times(discountAmountRatio).toNumber();
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if (maxDiscountAmount != 0) {
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discountPrice = discountPrice >= maxDiscountAmount ? maxDiscountAmount : discountPrice;
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}
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return {
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discountPrice, // 折扣抵扣金额（即优惠的金额）
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hasDiscountGoodsArr: [],
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};
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}
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/**
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* 商品券抵扣金额
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* @param canDikouGoodsArr 可抵扣商品列表
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* @param coupon 优惠券
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* @param user 用户信息
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*/
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export function returnCouponProductDiscount(canDikouGoodsArr, coupon, user) {
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const {
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useFoods,
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discountNum,
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useRule
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} = coupon;
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//抵扣商品数组
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let discountGoodsArr = [];
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//抵扣全部商品
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if (useFoods.length === 0) {
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if (useRule == "price_asc") {
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discountGoodsArr = canDikouGoodsArr
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.slice(canDikouGoodsArr.length - discountNum, canDikouGoodsArr.length)
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.reverse();
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} else {
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discountGoodsArr = canDikouGoodsArr.slice(0, discountNum);
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}
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} else {
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//抵扣选中商品
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const discountSelGoodsArr = canDikouGoodsArr.filter((v) =>
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useFoods.find((food) => food.id == v.productId)
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);
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if (useRule == "price_asc") {
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discountGoodsArr = discountSelGoodsArr
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.slice(discountSelGoodsArr.length - discountNum, discountSelGoodsArr.length)
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.reverse();
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} else {
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discountGoodsArr = discountSelGoodsArr.slice(0, discountNum);
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}
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}
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const result = calcDiscountGoodsArrPrice(discountGoodsArr, discountNum, user);
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return result;
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}
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// 返回买一送一券抵扣详情
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/**
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* @param canDikouGoodsArr 可抵扣商品列表
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* @param coupon 优惠券
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* @param user 用户信息
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* @param shopInfo 店铺信息
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*/
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function returnCouponBuyOneGiveOneDiscount(canDikouGoodsArr, coupon, user,shopInfo) {
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const {
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useFoods,
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useRule
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} = coupon;
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//抵扣商品
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let discountGoods = undefined;
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//符合买一送一条件的商品
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const canUseGoods = canDikouGoodsArr.filter((v) => v.num >= 2);
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//抵扣全部商品
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if (useFoods.length === 0) {
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if (useRule == "price_asc") {
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discountGoods = canUseGoods[canUseGoods.length - 1];
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} else {
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discountGoods = canUseGoods.slice(0, 1);
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}
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} else {
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//符合抵扣条件的商品
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const canUseGoods1 = canUseGoods.filter((v) => useFoods.find((food) => food.id == v.productId));
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if (useRule == "price_asc") {
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discountGoods = canUseGoods1[canUseGoods1.length - 1];
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} else {
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discountGoods = canUseGoods1.slice(0, 1);
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}
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}
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const discountPrice = returnGoodsPrice(discountGoods, user,shopInfo);
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const hasDiscountGoodsArr = [discountGoods];
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return {
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discountPrice,
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hasDiscountGoodsArr
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};
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}
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/**
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* 返回第二件半价券抵扣详情
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* @param canDikouGoodsArr 可抵扣商品列表
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* @param coupon 优惠券
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* @param user 用户信息
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* @param shopInfo 店铺信息
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*/
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function returnSecoendDiscount(canDikouGoodsArr, coupon, user,shopInfo) {
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const {
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useFoods,
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useRule
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} = coupon;
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//抵扣商品
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let discountGoods = undefined;
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//符合买一送一条件的商品
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const canUseGoods = canDikouGoodsArr.filter((v) => v.num >= 2);
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//抵扣全部商品
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if (useFoods.length === 0) {
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if (useRule == "price_asc") {
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discountGoods = canUseGoods[canUseGoods.length - 1];
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} else {
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discountGoods = canUseGoods.slice(0, 1);
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}
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} else {
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//符合抵扣条件的商品
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const canUseGoods1 = canUseGoods.filter((v) => useFoods.find((food) => food.id == v.productId));
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if (useRule == "price_asc") {
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discountGoods = canUseGoods1[canUseGoods1.length - 1];
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} else {
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discountGoods = canUseGoods1.slice(0, 1);
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}
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}
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const discountPrice = returnGoodsPrice(discountGoods, user,shopInfo);
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const hasDiscountGoodsArr = [discountGoods];
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//返回半价价格
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return {
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discountPrice: new BigNumber(discountPrice).dividedBy(2).toNumber(),
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hasDiscountGoodsArr,
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};
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}
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/**
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* 返回可以抵扣优惠券的商品列表,过滤掉赠品、临时商品,价格从高到低排序
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* @param arr 商品列表
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* @param user 用户信息
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* @param shopInfo 店铺信息
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*/
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export function returnCanDikouGoods(arr, user, shopInfo) {
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const result = arr
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.filter((v) => {
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return v.is_temporary != 1 && v.is_gift != 1;
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})
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.filter((v) => {
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return v.num > 0;
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})
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.sort((a, b) => {
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return returnGoodsPrice(b, use, shopInfo) - returnGoodsPrice(a, user, shopInfo);
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});
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return result;
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} |