// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
import type { NextApiRequest, NextApiResponse } from "next";

import { Low, JSONFile } from "lowdb";

type IDBData = {
  buildObj: {
    [key: string]: string[];
  };
};

const adapter = new JSONFile<IDBData>("./db.json");
const db = new Low(adapter);

interface IData {
  buildId: string;
}

// SSE 实时安装进度显示，https://www.ruanyifeng.com/blog/2017/05/server-sent_events.html
export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse<IData>
) {
  // Get data submitted in request's body.
  const body = req.body;

  const buildId = randomId();

  await db.read();
  db.data = db.data || { buildObj: {} };
  const { buildObj } = db.data;

  buildObj[buildId] = body.buildList;
  await db.write();

  res.status(200).json({ buildId: buildId });
}

function randomId(): string {
  function S4() {
    return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
  }
  return S4() + new Date().getTime() + S4() + S4();
}