package com.ruoyi.user.service.impl;
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import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
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import com.ruoyi.admin.api.entity.Prize;
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import com.ruoyi.user.entity.Order;
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import com.ruoyi.user.mapper.OrderMapper;
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import com.ruoyi.user.service.OrderService;
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import org.springframework.stereotype.Service;
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import java.util.List;
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import java.util.Random;
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import java.util.stream.Collectors;
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/**
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* <p>
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* 订单管理 服务实现类
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* </p>
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*
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* @author hjl
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* @since 2024-06-07
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*/
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@Service
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public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements OrderService {
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@Override
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public Object obtainAllowance(List<Prize> prizeList) {
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// 过滤中奖概率为空的奖品
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List<Prize> prizes = prizeList.stream().filter(data -> data.getProbability() != 0).collect(Collectors.toList());
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// 转盘逻辑
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double sum = prizes.stream().map(Prize::getProbability).mapToDouble(Double::doubleValue).sum();
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Prize result = null;
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for (Prize prize : prizes) {
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double item = prize.getProbability() / sum;
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// 随机数对象
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Random random = new Random();
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// 生成一个介于0到1之间的随机小数
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double randomDouble = random.nextDouble();
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if (item <= randomDouble) {
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result = prize;
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break;
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}
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}
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// 抽中的商品
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return result;
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}
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}
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