import { Init, Inject, Provide } from '@midwayjs/core';
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import { BaseService, CoolCommException } from '@cool-midway/core';
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import { InjectEntityModel } from '@midwayjs/typeorm';
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import { Repository } from 'typeorm';
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import { MarketCouponInfoEntity } from '../../entity/coupon/info';
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import { MarketCouponUserService } from './user';
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import { OrderInfoEntity } from '../../../order/entity/info';
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import * as moment from 'moment';
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/**
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* 优惠券信息
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*/
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@Provide()
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export class MarketCouponInfoService extends BaseService {
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@InjectEntityModel(MarketCouponInfoEntity)
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marketCouponInfoEntity: Repository<MarketCouponInfoEntity>;
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@Inject()
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marketCouponUserService: MarketCouponUserService;
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@Init()
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async init() {
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await super.init();
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this.setEntity(this.marketCouponInfoEntity);
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}
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/**
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* 检查优惠券状态
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* @param couponId
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*/
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async check(couponId: number) {
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const couponInfo: MarketCouponInfoEntity = await super.info(couponId);
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if (!couponInfo) {
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throw new CoolCommException('优惠券不存在');
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}
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// 判断数量
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if (couponInfo.receivedNum >= couponInfo.num) {
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throw new CoolCommException('优惠券已领完');
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}
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// 判断时间
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if (
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moment().isBefore(couponInfo.startTime) ||
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moment().isAfter(couponInfo.endTime)
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) {
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throw new CoolCommException('优惠券未开始或已结束');
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}
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// 判断状态
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if (couponInfo.status !== 1) {
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throw new CoolCommException('优惠券未启用');
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}
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return couponInfo;
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}
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/**
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* 领取优惠券
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* @param couponId
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* @param userId
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*/
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async receive(couponId: number, userId: number) {
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// 检查优惠券
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await this.check(couponId);
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// 检查用户是否已领取
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if (await this.marketCouponUserService.checkExist(couponId, userId)) {
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throw new CoolCommException('已领取过该优惠券');
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}
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// 保存
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await this.marketCouponUserService.save(couponId, userId);
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// 增加领取数量
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await this.marketCouponInfoEntity.increment(
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{ id: couponId },
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'receivedNum',
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1
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);
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}
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/**
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* 检查优惠券是否满足条件，满足的话使用并设置和返回订单优惠金额
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* @param couponId
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* @param userId
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* @param order
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*/
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async checkAndUse(couponId: number, userId: number, order: OrderInfoEntity) {
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// 判断优惠券
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const couponInfo = await this.check(couponId);
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// 判断用户
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await this.marketCouponUserService.check(couponId, userId);
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// 判断条件
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if (couponInfo.type == 0) {
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// 满减
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if (order.price < couponInfo.condition.fullAmount) {
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throw new CoolCommException('未满足优惠券使用条件');
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}
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// 设置订单的优惠金额
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order.discountPrice = couponInfo.amount;
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// 设置优惠来源
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order.discountSource = {
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type: 0,
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objectId: couponId,
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info: couponInfo,
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};
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// 设置商品的优惠金额
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if (order.price > 0) {
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order.goodsList.forEach(goods => {
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// 优惠金额 = 商品价格 / 订单总价 * 优惠金额 保留两位小数
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goods.discountPrice = Number(
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((goods.price / order.price) * couponInfo.amount).toFixed(2)
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);
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});
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}
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// 使用优惠券
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await this.marketCouponUserService.use(couponId, userId);
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return couponInfo.amount;
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}
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return 0;
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}
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}
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