import { Bot, Context, session } from "https://deno.land/x/grammy/mod.ts";
import { BotError } from "https://deno.land/x/grammy@v1.30.0/bot.ts";
import { Ctx, defaultSessionData } from "./ctx.ts";
import * as config from "../cfg/config.ts"
import { ERR_CODES, Err } from "../utils/errors.ts";

class BotUnknownRuntimeErr extends Err {
  code: ERR_CODES = ERR_CODES.UnknownErr;
  override cause?: BotError<Context>;
}
class BotUnknownOnStartErr extends Err {
  code: ERR_CODES = ERR_CODES.UnknownErr;
}

export const runBot = async (cfg: config.BotConfig, initMode: (bot: Bot<Ctx>) => void) => {
  // Bot initialization & setup
  const bot = new Bot<Ctx>(cfg.bot_token)
  bot.use(session({ initial: defaultSessionData }))
  bot.catch((err: BotError<Context>) => {
    throw new BotUnknownRuntimeErr("Unknown error while running the bot",
      { cause: err })
  })

  initMode(bot)

  console.log("Starting bot")
  await bot.start().catch(err => {
    throw new BotUnknownOnStartErr("Unknown error while starting the bot",
      { cause: err })
  })
}