#!/usr/bin/env python
# -*- coding: utf-8 -*-


"""Simple Bot to send timed Telegram messages.

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

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.
"""

from telegram.ext import Updater, CommandHandler
import logging

# 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 bot and
# update. Error handlers also receive the raised TelegramError object in error.
def start(bot, update):
    update.message.reply_text('Hi! Use /set <seconds> to set a timer')


def alarm(bot, job):
    """Send the alarm message."""
    bot.send_message(job.context, text='Beep!')


def set_timer(bot, update, args, job_queue, chat_data):
    """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(args[0])
        if due < 0:
            update.message.reply_text('Sorry we can not go back to future!')
            return

        # Add job to queue
        job = job_queue.run_once(alarm, due, context=chat_id)
        chat_data['job'] = job

        update.message.reply_text('Timer successfully set!')

    except (IndexError, ValueError):
        update.message.reply_text('Usage: /set <seconds>')


def unset(bot, update, chat_data):
    """Remove the job if the user changed their mind."""
    if 'job' not in chat_data:
        update.message.reply_text('You have no active timer')
        return

    job = chat_data['job']
    job.schedule_removal()
    del chat_data['job']

    update.message.reply_text('Timer successfully unset!')


def error(bot, update, error):
    """Log Errors caused by Updates."""
    logger.warning('Update "%s" caused error "%s"', update, error)


def main():
    """Run bot."""
    updater = Updater("TOKEN")

    # Get the dispatcher to register handlers
    dp = updater.dispatcher

    # on different commands - answer in Telegram
    dp.add_handler(CommandHandler("start", start))
    dp.add_handler(CommandHandler("help", start))
    dp.add_handler(CommandHandler("set", set_timer,
                                  pass_args=True,
                                  pass_job_queue=True,
                                  pass_chat_data=True))
    dp.add_handler(CommandHandler("unset", unset, pass_chat_data=True))

    # log all errors
    dp.add_error_handler(error)

    # 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()