package com.example.demo.coupon.service.impl;

import cn.hutool.core.util.IdUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.common.utils.TokenUtils;
import com.example.demo.coupon.dao.CouponMapper;
import com.example.demo.coupon.domain.Coupon;
import com.example.demo.coupon.domain.UserCoupon;
import com.example.demo.coupon.dto.UserCouponDto;
import com.example.demo.coupon.service.UserCouponService;
import com.example.demo.coupon.dao.UserCouponMapper;
import com.example.demo.user.vo.ResultVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Calendar;
import java.util.Date;

/**
* @author 徐乐
* @description 针对表【user_coupon(用户优惠券记录表)】的数据库操作Service实现
* @createDate 2025-06-17 18:40:22
*/
@Service
public class UserCouponServiceImpl extends ServiceImpl<UserCouponMapper, UserCoupon>
    implements UserCouponService{

    @Autowired
    private CouponMapper couponMapper;
    @Autowired
    private UserCouponMapper userCouponMapper;

    @Override
    public ResultVo userGetCoupon(UserCouponDto dto, String token) {
        Long userId = TokenUtils.getUserId(token);
        if (userId==null){
            return ResultVo.error(101,"请先登录");
        }
        UserCoupon userCoupon = new UserCoupon();
        userCoupon.setId(IdUtil.getSnowflake().nextId());
        userCoupon.setUserId(userId);
        Coupon coupon = couponMapper.selectById(dto.getCouponId());
        userCoupon.setCouponId(coupon.getId());
        userCoupon.setCouponName(coupon.getCouponName());
        userCoupon.setAmount(coupon.getAmount());
        coupon.setRemainCount(coupon.getRemainCount()-1);
        userCoupon.setObtainTime(new Date());
        userCoupon.setUseTime(null);
        // 处理 endTime：基于 startTime 延长 7 天
        Date startTime = userCoupon.getObtainTime();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(startTime);
        // 关键：Calendar.DAY_OF_MONTH 代表日期字段，加 7 天
        calendar.add(Calendar.DAY_OF_MONTH, 7);
        Date endTime = calendar.getTime();
        userCoupon.setExpireTime(endTime);
        userCouponMapper.insert(userCoupon);
        couponMapper.updateById(coupon);
        return ResultVo.success("用户领取优惠券成功");
    }
}