import fs from "fs";
import { Singleton, randint } from "tstl";

import { FakeIamportBackend } from "../FakeIamportBackend";
import { ErrorUtil } from "../utils/ErrorUtil";

const EXTENSION = __filename.substr(-2);
if (EXTENSION === "js") require("source-map-support/register");

const directory = new Singleton(async () => {
  await mkdir(`${__dirname}/../../assets`);
  await mkdir(`${__dirname}/../../assets/logs`);
  await mkdir(`${__dirname}/../../assets/logs/errors`);
});

function cipher(val: number): string {
  if (val < 10) return "0" + val;
  else return String(val);
}

async function mkdir(path: string): Promise<void> {
  try {
    await fs.promises.mkdir(path);
  } catch {}
}

async function handle_error(exp: any): Promise<void> {
  try {
    const date: Date = new Date();
    const fileName: string = `${date.getFullYear()}${cipher(
      date.getMonth() + 1,
    )}${cipher(date.getDate())}${cipher(date.getHours())}${cipher(
      date.getMinutes(),
    )}${cipher(date.getSeconds())}.${randint(0, Number.MAX_SAFE_INTEGER)}`;
    const content: string = JSON.stringify(ErrorUtil.toJSON(exp), null, 4);

    await directory.get();
    await fs.promises.writeFile(
      `${__dirname}/../../assets/logs/errors/${fileName}.log`,
      content,
      "utf8",
    );
  } catch {}
}

async function main(): Promise<void> {
  // BACKEND SEVER LATER
  const backend: FakeIamportBackend = new FakeIamportBackend();
  await backend.open();

  // UNEXPECTED ERRORS
  global.process.on("uncaughtException", handle_error);
  global.process.on("unhandledRejection", handle_error);
}
main().catch((exp) => {
  console.log(exp);
  process.exit(-1);
});