import TelegramBot from "node-telegram-bot-api";
import {
  option,
  readerTaskEither as rte,
  readonlyArray,
  semigroup,
  string,
  taskEither,
} from "fp-ts";
import { flow, pipe } from "fp-ts/lib/function.js";
import { describeArticle } from "./api.mjs";
import { extractMessageLink } from "./message.mjs";
import config from "./config.mjs";

const bot = new TelegramBot(config.telegramBotToken, {
  polling: true,
});

console.log("The telegram bot listens for updates");

bot.on("channel_post", (msg) => {
  const link = extractMessageLink(msg);
  if (option.isNone(link)) {
    console.log("cannot find link in msg:", msg);
    return;
  }

  pipe(
    describeArticle(link.value),
    rte.map(
      flow(
        readonlyArray.foldMap({
          ...string.Monoid,
          ...pipe(string.Semigroup, semigroup.intercalate("\n")),
        })((row) => `- ${row}`),
        string.trimLeft,
      ),
    ),
    rte.flatMapTaskEither(
      (res) =>
        taskEither.tryCatch(
          () =>
            bot.editMessageText(
              msg.text + "\n\nYandexGPT:\n\n" + res,
              {
                chat_id: (msg.forward_from_chat ?? msg.chat).id,
                message_id: msg.forward_from_message_id ?? msg.message_id,
                entities: msg.entities,
              },
            ),
          String,
        ),
    ),
    rte.match(
      (err) => console.log({ err, msg }),
      (res) => console.log("done", msg.message_id),
    ),
  )(config)();
});