//扣积分（合同审查用）
module.exports = {
  main: async (event) => {
    let { data = {}, userInfo, util } = event;
    let { db, _ } = util;
    const { amount, reason, biz_type, biz_id } = data;

    if (!amount || amount <= 0) {
      return { code: -1, msg: '扣减数量无效' };
    }

    // 查余额
    const userRes = await db.collection('jjx-user-points').doc(userInfo.uid).get();
    if (!userRes.data.length) {
      return { code: -1, msg: '积分账户不存在，请先获取积分' };
    }

    const currentBalance = userRes.data[0].balance;
    if (currentBalance < amount) {
      return { code: -1, msg: '积分不足', data: { balance: currentBalance, needed: amount } };
    }

    const newBalance = currentBalance - amount;

    // 扣减余额
    await db.collection('jjx-user-points').doc(userInfo.uid).update({
      balance: newBalance,
      total_spent: _.inc(amount),
      update_time: new Date()
    });

    // 记录流水
    await db.collection('jjx-points-log').add({
      user_id: userInfo.uid,
      type: 'spend',
      amount: -amount,
      balance_after: newBalance,
      reason: reason || '积分消耗',
      biz_type: biz_type || 'other',
      biz_id: biz_id || '',
      _add_time: new Date()
    });

    return { code: 0, msg: 'ok', data: { balance: newBalance } };
  }
};