const express = require("express");
const { webhookCallback } = require("grammy");

const config = require("./config");
const cache = require("./cache");
const bot = require("./bot");
const log = require("./log");

if (config.get("TELEGRAM_POLLING")) {
  bot.api.deleteWebhook().then(() => {
    log.info("starting bot in polling mode");
    bot.start();
  });

  bot.catch((err) => {
    log.error(err);
  });
} else {
  const app = express();
  app.use(express.json());
  log.info("starting bot in webhook mode");
  app.use(webhookCallback(bot, "express"));
  app.use(function (err, _, res, _) {
    log.error(err);
    return res.status(500);
  });

  const webhookEndpoint = `${config.get("SERVER_ENDPOINT")}/${config.get(
    "TELEGRAM_TOKEN"
  )}`;
  log.debug(`setting webhook at ${webhookEndpoint}`);
  bot.api.setWebhook(webhookEndpoint).then(async () => {
    const webhookInfo = await bot.api.getWebhookInfo();
    log.info(webhookInfo, "webhook successfully set");
  });

  log.info("starting server");
  const server = app.listen(
    config.get("SERVER_PORT"),
    config.get("SERVER_HOST")
  );

  for (const signal of ["SIGINT", "SIGTERM"]) {
    process.once(signal, async () => {
      log.info("shutting down server");
      await server.close();
      await cache.disconnect();
      process.exit(0);
    });
  }
}