#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This program is dedicated to the public domain under the CC0 license.

"""
First, a few callback 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:
Example of a bot-user conversation using ConversationHandler.
Send /start to initiate the conversation.
Press Ctrl-C on the command line or send a signal to the process to stop the
bot.
"""

import logging

from telegram import ReplyKeyboardMarkup
from telegram.ext import (Updater, CommandHandler, MessageHandler, Filters,
                          ConversationHandler)

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

logger = logging.getLogger(__name__)

CHOOSING, TYPING_REPLY, TYPING_CHOICE = range(3)

reply_keyboard = [['Age', 'Favourite colour'],
                  ['Number of siblings', 'Something else...'],
                  ['Done']]
markup = ReplyKeyboardMarkup(reply_keyboard, one_time_keyboard=True)


def facts_to_str(user_data):
    facts = list()

    for key, value in user_data.items():
        facts.append('{} - {}'.format(key, value))

    return "\n".join(facts).join(['\n', '\n'])


def start(update, context):
    update.message.reply_text(
        "Hi! My name is Doctor Botter. I will hold a more complex conversation with you. "
        "Why don't you tell me something about yourself?",
        reply_markup=markup)

    return CHOOSING


def regular_choice(update, context):
    text = update.message.text
    context.user_data['choice'] = text
    update.message.reply_text(
        'Your {}? Yes, I would love to hear about that!'.format(text.lower()))

    return TYPING_REPLY


def custom_choice(update, context):
    update.message.reply_text('Alright, please send me the category first, '
                              'for example "Most impressive skill"')

    return TYPING_CHOICE


def received_information(update, context):
    user_data = context.user_data
    text = update.message.text
    category = user_data['choice']
    user_data[category] = text
    del user_data['choice']

    update.message.reply_text("Neat! Just so you know, this is what you already told me:"
                              "{} You can tell me more, or change your opinion"
                              " on something.".format(facts_to_str(user_data)),
                              reply_markup=markup)

    return CHOOSING


def done(update, context):
    user_data = context.user_data
    if 'choice' in user_data:
        del user_data['choice']

    update.message.reply_text("I learned these facts about you:"
                              "{}"
                              "Until next time!".format(facts_to_str(user_data)))

    user_data.clear()
    return ConversationHandler.END


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


def main():
    # Create the Updater and pass it your bot's token.
    # Make sure to set use_context=True to use the new context based callbacks
    # Post version 12 this will no longer be necessary
    updater = Updater("TOKEN", use_context=True)

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

    # Add conversation handler with the states CHOOSING, TYPING_CHOICE and TYPING_REPLY
    conv_handler = ConversationHandler(
        entry_points=[CommandHandler('start', start)],

        states={
            CHOOSING: [MessageHandler(Filters.regex('^(Age|Favourite colour|Number of siblings)$'),
                                      regular_choice),
                       MessageHandler(Filters.regex('^Something else...$'),
                                      custom_choice)
                       ],

            TYPING_CHOICE: [MessageHandler(Filters.text,
                                           regular_choice)
                            ],

            TYPING_REPLY: [MessageHandler(Filters.text,
                                          received_information),
                           ],
        },

        fallbacks=[MessageHandler(Filters.regex('^Done$'), done)]
    )

    dp.add_handler(conv_handler)

    # log all errors
    dp.add_error_handler(error)

    # Start the Bot
    updater.start_polling()

    # Run the bot 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()
