#!/usr/bin/env python
# pylint: disable=global-statement
"""Simple Bot to reply to Telegram messages.

This is built on the API wrapper, see echobot.py to see the same example built
on the telegram.ext bot framework.
This program is dedicated to the public domain under the CC0 license.
"""
import asyncio
import logging
from typing import NoReturn

from telegram import Bot
from telegram.error import NetworkError, Forbidden


logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.INFO
)
logger = logging.getLogger(__name__)


async def main() -> NoReturn:
    """Run the bot."""
    # Here we use the `async with` syntax to properly initialize and shutdown resources.
    async with Bot("TOKEN") as bot:
        # get the first pending update_id, this is so we can skip over it in case
        # we get a "Forbidden" exception.
        try:
            update_id = (await bot.get_updates())[0].update_id
        except IndexError:
            update_id = None

        logger.info("listening for new messages...")
        while True:
            try:
                update_id = await echo(bot, update_id)
            except NetworkError:
                await asyncio.sleep(1)
            except Forbidden:
                # The user has removed or blocked the bot.
                update_id += 1


async def echo(bot: Bot, update_id: int) -> int:
    """Echo the message the user sent."""
    # Request updates after the last update_id
    updates = await bot.get_updates(offset=update_id, timeout=10)
    for update in updates:
        next_update_id = update.update_id + 1

        # your bot can receive updates without messages
        # and not all messages contain text
        if update.message and update.message.text:
            # Reply to the message
            logger.info("Found message %s!", update.message.text)
            await update.message.reply_text(update.message.text)
        return next_update_id
    return update_id


if __name__ == '__main__':
    try:
        asyncio.run(main())
    except KeyboardInterrupt:  # Ignore exception when Ctrl-C is pressed
        pass