package com.ruoyi.goods.service.impl;
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import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
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import com.ruoyi.common.core.constant.Constants;
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import com.ruoyi.common.core.constant.RedisConstants;
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import com.ruoyi.common.core.exception.GlobalException;
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import com.ruoyi.common.security.service.TokenService;
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import com.ruoyi.goods.domain.Recipient;
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import com.ruoyi.goods.domain.TGoods;
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import com.ruoyi.goods.domain.TOrder;
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import com.ruoyi.goods.dto.GoodExchangeDTO;
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import com.ruoyi.goods.mapper.TGoodsMapper;
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import com.ruoyi.goods.service.ITGoodsService;
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import com.ruoyi.goods.service.ITOrderService;
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import com.ruoyi.goods.vo.GoodDetailVO;
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import com.ruoyi.goods.vo.TGoodsVO;
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import com.ruoyi.study.api.domain.TUser;
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import com.ruoyi.study.api.feignClient.StudyClient;
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import org.redisson.api.RSemaphore;
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import org.redisson.api.RedissonClient;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import javax.annotation.Resource;
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import java.util.Date;
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import java.util.List;
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import java.util.stream.Collectors;
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/**
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* <p>
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* 商品表 服务实现类
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* </p>
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*
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* @author 无关风月
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* @since 2024-04-26
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*/
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@Service
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public class TGoodsServiceImpl extends ServiceImpl<TGoodsMapper, TGoods> implements ITGoodsService {
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@Resource
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private RedissonClient redissonClient;
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@Resource
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private StudyClient studyClient;
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@Resource
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private ITOrderService orderService;
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@Resource
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private TokenService tokenService;
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@Override
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public List<TGoodsVO> goodRecommend(Integer userId) {
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return baseMapper.goodRecommend(userId);
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}
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@Override
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public GoodDetailVO redeemNow(String goodId, Recipient recipient) {
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// 商品详情
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TGoods goods = lambdaQuery().eq(TGoods::getId, goodId).one();
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// 库存预热，redisson分布式锁
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String key = String.format(RedisConstants.GOOD_STOCK, goods.getId());
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RSemaphore semaphore = redissonClient.getSemaphore(key);
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semaphore.trySetPermits(goods.getSurplus());
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return new GoodDetailVO(goods, recipient);
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}
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@Override
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@Transactional(rollbackFor = Exception.class)
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public Boolean goodExchange(GoodExchangeDTO goodExchange, Recipient recipient) {
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Integer number = goodExchange.getNumber();
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Integer goodId = goodExchange.getGoodId();
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TGoods good = this.getById(goodId);
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if (null == good) {
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throw new GlobalException("商品不存在，请稍后重试！");
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}
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// 校验用户积分是否足够兑换
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TUser user = studyClient.userInfo().getData();
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int needIntegral = good.getIntegral() * number;
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if (user.getIntegral() < needIntegral) {
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throw new GlobalException("兑换失败，当前剩余积分不足！");
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}
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// 检查用户兑换数量是否超过单用户最大兑换数量
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List<TOrder> orderList = orderService.lambdaQuery().eq(TOrder::getUserId, user.getId()).eq(TOrder::getGoodsId, goodId).list();
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// 该商品订单为空、订单数量未超过商品的单个用户兑换上限数量时，可以进行兑换
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int totalNumber = orderList.stream().map(TOrder::getCount).collect(Collectors.toList()).stream().mapToInt(Integer::intValue).sum();
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boolean canExchange = orderList.isEmpty() || null == good.getUserCount() || (totalNumber + number) <= good.getUserCount();
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if (!canExchange) {
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throw new GlobalException("兑换失败，当前兑换数量已超过最大兑换数量，剩余兑换数量为: " + (good.getUserCount() - totalNumber) + "！");
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}
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// redisson分布式锁，防止超卖
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String key = String.format(RedisConstants.GOOD_STOCK, good.getId());
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RSemaphore semaphore = redissonClient.getSemaphore(key);
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// 请求超时时间 单位：毫秒
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semaphore.trySetPermits(1000);
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boolean tried = semaphore.tryAcquire(number);
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// 兑换失败，库存不足
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if (!tried) {
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semaphore.release(number);
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throw new GlobalException("当前商品库存不足！");
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}
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// 兑换成功，生成订单信息、生成积分明细(积分明细需要远程调用rouyi-study服务)
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TOrder order = orderInfo(goodExchange, recipient, number, goodId, needIntegral);
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boolean result = orderService.save(order);
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// 远程调用，生成积分明细
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result = result && studyClient.addIntegralDetail(Constants.BURDEN + needIntegral, Constants.SHOPPING_CONSUME).getData();
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// 扣除用户积分
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result = result && studyClient.exchangeIntegral(needIntegral, Constants.BURDEN).getData();
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// 扣除库存
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result = result && this.lambdaUpdate().set(TGoods::getSurplus, good.getSurplus() - number).eq(TGoods::getId, good.getId()).update();
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if (!result) {
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semaphore.release(number);
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throw new GlobalException("商品兑换失败！");
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}
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return result;
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}
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private TOrder orderInfo(GoodExchangeDTO goodExchange, Recipient recipient, Integer number, Integer goodId, int needIntegral) {
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TOrder order = new TOrder();
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order.setOrderNumber(goodExchange.getOrderNumber());
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order.setUserId(tokenService.getLoginUserStudy().getUserid());
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order.setInsertTime(new Date());
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order.setGoodsId(goodId);
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order.setCount(number);
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order.setState(1);
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order.setIntegral(needIntegral);
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order.setConsigneeName(recipient.getRecipient());
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order.setConsigneePhone(recipient.getRecipientPhone());
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order.setConsigneeAddress(recipient.getAddress());
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order.setDisabled(Boolean.FALSE);
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return order;
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}
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}
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