// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
import type { NextApiRequest, NextApiResponse } from 'next';
import { jsonRes } from '@/service/response';
import { AuthCode } from '@/service/models/authCode';
import { connectToDatabase, User } from '@/service/mongo';
import { sendCode } from '@/service/utils/sendEmail';
import { EmailTypeEnum } from '@/constants/common';

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
  try {
    const { email, type } = req.query as { email: string; type: `${EmailTypeEnum}` };

    if (!email || !type) {
      throw new Error('缺少参数');
    }

    await connectToDatabase();

    // 注册人数限流
    if (type === EmailTypeEnum.register) {
      const maxCount = process.env.MAX_USER ? +process.env.MAX_USER : Infinity;
      const userCount = await User.count();

      if (userCount >= maxCount) {
        throw new Error('当前注册用户已满，请等待名额~');
      }
    }

    let code = '';
    for (let i = 0; i < 6; i++) {
      code += Math.floor(Math.random() * 10);
    }

    // 判断 1 分钟内是否有重复数据
    const authCode = await AuthCode.findOne({
      email,
      type,
      expiredTime: { $gte: Date.now() + 4 * 60 * 1000 } // 如果有一个记录的过期时间，大于当前+4分钟，说明距离上次发送还没到1分钟。（因为默认创建时，过期时间是未来5分钟）
    });

    if (authCode) {
      throw new Error('请勿频繁获取验证码');
    }

    // 创建 auth 记录
    await AuthCode.create({
      email,
      type,
      code
    });

    // 发送验证码
    await sendCode(email as string, code, type as `${EmailTypeEnum}`);

    jsonRes(res, {
      message: '发送验证码成功'
    });
  } catch (err) {
    jsonRes(res, {
      code: 500,
      error: err
    });
  }
}