微服务项目：尚融宝（52）（核心业务流程：投标（3））

@Api(tags = "标的的投资")
@RestController
@RequestMapping("/api/core/lendItem")
@Slf4j
public class LendItemController {
    
    @Resource
    LendItemService lendItemService;

    @ApiOperation("会员投资提交数据")
    @PostMapping("/auth/commitInvest")
    public R commitInvest(@RequestBody InvestVO investVO, HttpServletRequest request) {

        String token = request.getHeader("token");
        Long userId = JwtUtils.getUserId(token);
        String userName = JwtUtils.getUserName(token);
        investVO.setInvestUserId(userId);
        investVO.setInvestName(userName);

        //构建充值自动提交表单
        String formStr = lendItemService.commitInvest(investVO);
        return R.ok().data("formStr", formStr);
    }
}

String commitInvest(InvestVO investVO);

@Resource
private LendMapper lendMapper;

@Resource
private LendService lendService;

@Resource
private UserAccountService userAccountService;

@Resource
private UserBindService userBindService;


@Override
public String commitInvest(InvestVO investVO) {

    //输入校验==========================================
    Long lendId = investVO.getLendId();
    //获取标的信息
    Lend lend = lendMapper.selectById(lendId);

    //标的状态必须为募资中
    Assert.isTrue(
        lend.getStatus().intValue() == LendStatusEnum.INVEST_RUN.getStatus().intValue(),
        ResponseEnum.LEND_INVEST_ERROR);

    //标的不能超卖：(已投金额 + 本次投资金额 )>=标的金额（超卖）
    BigDecimal sum = lend.getInvestAmount().add(new BigDecimal(investVO.getInvestAmount()));
    Assert.isTrue(sum.doubleValue() <= lend.getAmount().doubleValue(),
                  ResponseEnum.LEND_FULL_SCALE_ERROR);

    //账户可用余额充足：当前用户的余额 >= 当前用户的投资金额（可以投资）
    Long investUserId = investVO.getInvestUserId();
    BigDecimal amount = userAccountService.getAccount(investUserId);//获取当前用户的账户余额
    Assert.isTrue(amount.doubleValue() >= Double.parseDouble(investVO.getInvestAmount()),
                  ResponseEnum.NOT_SUFFICIENT_FUNDS_ERROR);

    //在商户平台中生成投资信息==========================================
    //标的下的投资信息
    LendItem lendItem = new LendItem();
    lendItem.setInvestUserId(investUserId);//投资人id
    lendItem.setInvestName(investVO.getInvestName());//投资人名字
    String lendItemNo = LendNoUtils.getLendItemNo();
    lendItem.setLendItemNo(lendItemNo); //投资条目编号（一个Lend对应一个或多个LendItem）
    lendItem.setLendId(investVO.getLendId());//对应的标的id
    lendItem.setInvestAmount(new BigDecimal(investVO.getInvestAmount())); //此笔投资金额
    lendItem.setLendYearRate(lend.getLendYearRate());//年化
    lendItem.setInvestTime(LocalDateTime.now()); //投资时间
    lendItem.setLendStartDate(lend.getLendStartDate()); //开始时间
    lendItem.setLendEndDate(lend.getLendEndDate()); //结束时间

    //预期收益
    BigDecimal expectAmount = lendService.getInterestCount(
        lendItem.getInvestAmount(),
        lendItem.getLendYearRate(),
        lend.getPeriod(),
        lend.getReturnMethod());
    lendItem.setExpectAmount(expectAmount);

    //实际收益
    lendItem.setRealAmount(new BigDecimal(0));

    lendItem.setStatus(0);//默认状态：刚刚创建
    baseMapper.insert(lendItem);


    //组装投资相关的参数，提交到汇付宝资金托管平台==========================================
    //在托管平台同步用户的投资信息，修改用户的账户资金信息==========================================
    //获取投资人的绑定协议号
    String bindCode = userBindService.getBindCodeByUserId(investUserId);
    //获取借款人的绑定协议号
    String benefitBindCode = userBindService.getBindCodeByUserId(lend.getUserId());

    //封装提交至汇付宝的参数
    Map<String, Object> paramMap = new HashMap<>();
    paramMap.put("agentId", HfbConst.AGENT_ID);
    paramMap.put("voteBindCode", bindCode);
    paramMap.put("benefitBindCode",benefitBindCode);
    paramMap.put("agentProjectCode", lend.getLendNo());//项目标号
    paramMap.put("agentProjectName", lend.getTitle());

    //在资金托管平台上的投资订单的唯一编号，要和lendItemNo保持一致。
    paramMap.put("agentBillNo", lendItemNo);//订单编号
    paramMap.put("voteAmt", investVO.getInvestAmount());
    paramMap.put("votePrizeAmt", "0");
    paramMap.put("voteFeeAmt", "0");
    paramMap.put("projectAmt", lend.getAmount()); //标的总金额
    paramMap.put("note", "");
    paramMap.put("notifyUrl", HfbConst.INVEST_NOTIFY_URL); //检查常量是否正确
    paramMap.put("returnUrl", HfbConst.INVEST_RETURN_URL);
    paramMap.put("timestamp", RequestHelper.getTimestamp());
    String sign = RequestHelper.getSign(paramMap);
    paramMap.put("sign", sign);

    //构建充值自动提交表单
    String formStr = FormHelper.buildForm(HfbConst.INVEST_URL, paramMap);
    return formStr;
}

String getBindCodeByUserId(Long userId);

@Override
public String getBindCodeByUserId(Long userId){
    QueryWrapper<UserBind> userBindQueryWrapper = new QueryWrapper<>();
    userBindQueryWrapper.eq("user_id", userId);
    UserBind userBind = baseMapper.selectOne(userBindQueryWrapper);
    String bindCode = userBind.getBindCode();
    return bindCode;
}