#!/usr/bin/env python
# pylint: disable=unused-argument
# 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 Application 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, ReplyKeyboardRemove, Update
from telegram.ext import (
    Application,
    CallbackContext,
    CommandHandler,
    ConversationHandler,
    MessageHandler,
    filters,
)

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

GENDER, PHOTO, LOCATION, BIO = range(4)


async def start(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Starts the conversation and asks the user about their gender."""
    reply_keyboard = [['Boy', 'Girl', 'Other']]

    await update.message.reply_text(
        'Hi! My name is Professor Bot. I will hold a conversation with you. '
        'Send /cancel to stop talking to me.\n\n'
        'Are you a boy or a girl?',
        reply_markup=ReplyKeyboardMarkup(
            reply_keyboard, one_time_keyboard=True, input_field_placeholder='Boy or Girl?'
        ),
    )

    return GENDER


async def gender(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Stores the selected gender and asks for a photo."""
    user = update.message.from_user
    logger.info("Gender of %s: %s", user.first_name, update.message.text)
    await update.message.reply_text(
        'I see! Please send me a photo of yourself, '
        'so I know what you look like, or send /skip if you don\'t want to.',
        reply_markup=ReplyKeyboardRemove(),
    )

    return PHOTO


async def photo(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Stores the photo and asks for a location."""
    user = update.message.from_user
    photo_file = await update.message.photo[-1].get_file()
    await photo_file.download('user_photo.jpg')
    logger.info("Photo of %s: %s", user.first_name, 'user_photo.jpg')
    await update.message.reply_text(
        'Gorgeous! Now, send me your location please, or send /skip if you don\'t want to.'
    )

    return LOCATION


async def skip_photo(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Skips the photo and asks for a location."""
    user = update.message.from_user
    logger.info("User %s did not send a photo.", user.first_name)
    await update.message.reply_text(
        'I bet you look great! Now, send me your location please, or send /skip.'
    )

    return LOCATION


async def location(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Stores the location and asks for some info about the user."""
    user = update.message.from_user
    user_location = update.message.location
    logger.info(
        "Location of %s: %f / %f", user.first_name, user_location.latitude, user_location.longitude
    )
    await update.message.reply_text(
        'Maybe I can visit you sometime! At last, tell me something about yourself.'
    )

    return BIO


async def skip_location(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Skips the location and asks for info about the user."""
    user = update.message.from_user
    logger.info("User %s did not send a location.", user.first_name)
    await update.message.reply_text(
        'You seem a bit paranoid! At last, tell me something about yourself.'
    )

    return BIO


async def bio(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Stores the info about the user and ends the conversation."""
    user = update.message.from_user
    logger.info("Bio of %s: %s", user.first_name, update.message.text)
    await update.message.reply_text('Thank you! I hope we can talk again some day.')

    return ConversationHandler.END


async def cancel(update: Update, context: CallbackContext.DEFAULT_TYPE) -> int:
    """Cancels and ends the conversation."""
    user = update.message.from_user
    logger.info("User %s canceled the conversation.", user.first_name)
    await update.message.reply_text(
        'Bye! I hope we can talk again some day.', reply_markup=ReplyKeyboardRemove()
    )

    return ConversationHandler.END


def main() -> None:
    """Run the bot."""
    # Create the Application and pass it your bot's token.
    application = Application.builder().token("TOKEN").build()

    # Add conversation handler with the states GENDER, PHOTO, LOCATION and BIO
    conv_handler = ConversationHandler(
        entry_points=[CommandHandler('start', start)],
        states={
            GENDER: [MessageHandler(filters.Regex('^(Boy|Girl|Other)$'), gender)],
            PHOTO: [MessageHandler(filters.PHOTO, photo), CommandHandler('skip', skip_photo)],
            LOCATION: [
                MessageHandler(filters.LOCATION, location),
                CommandHandler('skip', skip_location),
            ],
            BIO: [MessageHandler(filters.TEXT & ~filters.COMMAND, bio)],
        },
        fallbacks=[CommandHandler('cancel', cancel)],
    )

    application.add_handler(conv_handler)

    # Run the bot until the user presses Ctrl-C
    application.run_polling()


if __name__ == '__main__':
    main()