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#!/usr/bin/env python

# pylint: disable=C0116,W0613

# This program is dedicated to the public domain under the CC0 license.

"""

Simple Bot to send timed Telegram messages.

This Bot uses the Updater class to handle the bot and the JobQueue to send

timed messages.

First, a few handler functions are defined. Then, those functions are passed to

the Dispatcher and registered at their respective places.

Then, the bot is started and runs until we press Ctrl-C on the command line.

Usage:

Basic Alarm Bot example, sends a message after a set time.

Press Ctrl-C on the command line or send a signal to the process to stop the

bot.

"""

import logging

from telegram import Update

from telegram.ext import Updater, CommandHandler, CallbackContext

# Enable logging

logging.basicConfig(

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

)

logger = logging.getLogger(__name__)

# Define a few command handlers. These usually take the two arguments update and

# context. Error handlers also receive the raised TelegramError object in error.

# Best practice would be to replace context with an underscore,

# since context is an unused local variable.

# This being an example and not having context present confusing beginners,

# we decided to have it present as context.

def start(update: Update, context: CallbackContext) -> None:

"""Sends explanation on how to use the bot."""

update.message.reply_text('Hi! Use /set <seconds> to set a timer')

def alarm(context: CallbackContext) -> None:

"""Send the alarm message."""

job = context.job

context.bot.send_message(job.context, text='Beep!')

def remove_job_if_exists(name: str, context: CallbackContext) -> bool:

"""Remove job with given name. Returns whether job was removed."""

current_jobs = context.job_queue.get_jobs_by_name(name)

if not current_jobs:

return False

for job in current_jobs:

job.schedule_removal()

return True

def set_timer(update: Update, context: CallbackContext) -> None:

"""Add a job to the queue."""

chat_id = update.message.chat_id

try:

# args[0] should contain the time for the timer in seconds

due = int(context.args[0])

if due < 0:

update.message.reply_text('Sorry we can not go back to future!')

return

job_removed = remove_job_if_exists(str(chat_id), context)

context.job_queue.run_once(alarm, due, context=chat_id, name=str(chat_id))

text = 'Timer successfully set!'

if job_removed:

text += ' Old one was removed.'

update.message.reply_text(text)

except (IndexError, ValueError):

update.message.reply_text('Usage: /set <seconds>')

def unset(update: Update, context: CallbackContext) -> None:

"""Remove the job if the user changed their mind."""

chat_id = update.message.chat_id

job_removed = remove_job_if_exists(str(chat_id), context)

text = 'Timer successfully cancelled!' if job_removed else 'You have no active timer.'

update.message.reply_text(text)

def main() -> None:

"""Run bot."""

# Create the Updater and pass it your bot's token.

updater = Updater("TOKEN")

# Get the dispatcher to register handlers

dispatcher = updater.dispatcher

# on different commands - answer in Telegram

dispatcher.add_handler(CommandHandler("start", start))

dispatcher.add_handler(CommandHandler("help", start))

dispatcher.add_handler(CommandHandler("set", set_timer))

dispatcher.add_handler(CommandHandler("unset", unset))

# Start the Bot

updater.start_polling()

# Block until you press Ctrl-C or the process receives SIGINT, SIGTERM or

# SIGABRT. This should be used most of the time, since start_polling() is

# non-blocking and will stop the bot gracefully.

updater.idle()

if __name__ == '__main__':

main()