package cc.mrbird.febs.mall.service.impl;

import cc.mrbird.febs.common.exception.FebsException;
import cc.mrbird.febs.mall.entity.MallMemberWallet;
import cc.mrbird.febs.mall.mapper.MallMemberWalletMapper;
import cc.mrbird.febs.mall.service.IApiMallMemberWalletService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;

/**
 * @author wzy
 * @date 2021-09-22
 **/
@Slf4j
@Service
@RequiredArgsConstructor
public class ApiMallMemberWalletServiceImpl extends ServiceImpl<MallMemberWalletMapper, MallMemberWallet> implements IApiMallMemberWalletService {


    @Override
    public void addBalance(BigDecimal amount, Long memberId) {

    }

    @Override
    public void reduceBalance(BigDecimal amount, Long memberId) {
        int i = 0;
        boolean flag = true;

        while (flag) {
            i++;
            MallMemberWallet wallet = this.baseMapper.selectWalletByMemberId(memberId);
            if (amount.compareTo(wallet.getBalance()) < 0) {
                throw new FebsException("余额不足");
            }

            wallet.setBalance(wallet.getBalance().subtract(amount));

            int result = this.baseMapper.updateBalanceWithVersion(wallet);
            if (result > 0) {
                flag = false;
            } else {
                if (i > 2) {
                    throw new FebsException("余额支付失败");
                }
            }
        }
    }
}