#!/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 typing import Dict

from telegram import ReplyKeyboardMarkup, ReplyKeyboardRemove, Update
from telegram.ext import (
    Application,
    CommandHandler,
    ContextTypes,
    ConversationHandler,
    MessageHandler,
    PicklePersistence,
    filters,
)

# Enable logging
logging.basicConfig(
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s", level=logging.INFO
)
# set higher logging level for httpx to avoid all GET and POST requests being logged
logging.getLogger("httpx").setLevel(logging.WARNING)

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: Dict[str, str]) -> str:
    """Helper function for formatting the gathered user info."""
    facts = [f"{key} - {value}" for key, value in user_data.items()]
    return "\n".join(facts).join(["\n", "\n"])


async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> int:
    """Start the conversation, display any stored data and ask user for input."""
    reply_text = "Hi! My name is Doctor Botter."
    if context.user_data:
        reply_text += (
            f" You already told me your {', '.join(context.user_data.keys())}. Why don't you "
            "tell me something more about yourself? Or change anything I already know."
        )
    else:
        reply_text += (
            " I will hold a more complex conversation with you. Why don't you tell me "
            "something about yourself?"
        )
    await update.message.reply_text(reply_text, reply_markup=markup)

    return CHOOSING


async def regular_choice(update: Update, context: ContextTypes.DEFAULT_TYPE) -> int:
    """Ask the user for info about the selected predefined choice."""
    text = update.message.text.lower()
    context.user_data["choice"] = text
    if context.user_data.get(text):
        reply_text = (
            f"Your {text}? I already know the following about that: {context.user_data[text]}"
        )
    else:
        reply_text = f"Your {text}? Yes, I would love to hear about that!"
    await update.message.reply_text(reply_text)

    return TYPING_REPLY


async def custom_choice(update: Update, context: ContextTypes.DEFAULT_TYPE) -> int:
    """Ask the user for a description of a custom category."""
    await update.message.reply_text(
        'Alright, please send me the category first, for example "Most impressive skill"'
    )

    return TYPING_CHOICE


async def received_information(update: Update, context: ContextTypes.DEFAULT_TYPE) -> int:
    """Store info provided by user and ask for the next category."""
    text = update.message.text
    category = context.user_data["choice"]
    context.user_data[category] = text.lower()
    del context.user_data["choice"]

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

    return CHOOSING


async def show_data(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Display the gathered info."""
    await update.message.reply_text(
        f"This is what you already told me: {facts_to_str(context.user_data)}"
    )


async def done(update: Update, context: ContextTypes.DEFAULT_TYPE) -> int:
    """Display the gathered info and end the conversation."""
    if "choice" in context.user_data:
        del context.user_data["choice"]

    await update.message.reply_text(
        f"I learned these facts about you: {facts_to_str(context.user_data)}Until next time!",
        reply_markup=ReplyKeyboardRemove(),
    )
    return ConversationHandler.END


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

    # 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 & ~(filters.COMMAND | filters.Regex("^Done$")), regular_choice
                )
            ],
            TYPING_REPLY: [
                MessageHandler(
                    filters.TEXT & ~(filters.COMMAND | filters.Regex("^Done$")),
                    received_information,
                )
            ],
        },
        fallbacks=[MessageHandler(filters.Regex("^Done$"), done)],
        name="my_conversation",
        persistent=True,
    )

    application.add_handler(conv_handler)

    show_data_handler = CommandHandler("show_data", show_data)
    application.add_handler(show_data_handler)

    # Run the bot until the user presses Ctrl-C
    application.run_polling(allowed_updates=Update.ALL_TYPES)


if __name__ == "__main__":
    main()