const express = require('express');
const router = express.Router();
const { getDB } = require('../database');


router.get('/', async (req, res) => {
  try {
    const db = getDB();
    const query = `
      SELECT * FROM coupon_products where remain > 0
    `
    const [coupon] = await db.query(query);

    if (coupon.length === 0) {
      res.json({ error: '暂无优惠券' });
    } 

    res.json({coupon, success: true});
  } catch (error) {
    res.status(500).json({ error: '获取优惠券失败' });
  }
});
router.get('/:id', async (req, res) => {
  try {
    const userId = req.params.id;
    const couponId = req.body.coupon_id;
    const db = getDB();
    const query = `
      SELECT * FROM coupon_products where remain > 0
    `
    const [coupon] = await db.query(query);

    if (coupon.length === 0) {
      return res.status(404).json({ error: '暂无优惠券' });
    } else {
      const query = [`
        select * from coupon_use where user_id = ?
      `,`
        update coupon_products set remain = remain - 1 where id = ?
      `,`
        insert into coupon_use (user_id, coupon_id, get_time) values (?, ?, now())
      `]
      const [checkUser] = await db.query(query[0], [userId]);
      console.log("12345",checkUser)
      for (const item of checkUser) {
        if (item.coupon_id === coupon[0].id && item.use_time === null) {
          return res.status(400).json({ error: '优惠券已领取' });
        }
      }
      await db.query(query[1], [coupon[0].id]);
      await db.query(query[2], [userId, coupon[0].id]);
    }

    res.json({coupon, success: true});
  } catch (error) {
    res.status(500).json({ error: '获取优惠券失败' });
  }
});

module.exports = router;