#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2017
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program.  If not, see [http://www.gnu.org/licenses/].
""" This module contains the CallbackQueryHandler class """

import re

from future.utils import string_types

from telegram import Update
from .handler import Handler


class CallbackQueryHandler(Handler):
    """
    Handler class to handle Telegram callback queries. Optionally based on a regex.
    Read the documentation of the ``re`` module for more information.

    Args:
        callback (function): A function that takes ``bot, update`` as
            positional arguments. It will be called when the ``check_update``
            has determined that an update should be processed by this handler.
        pass_update_queue (optional[bool]): If set to ``True``, a keyword argument called
            ``update_queue`` will be passed to the callback function. It will be the ``Queue``
            instance used by the ``Updater`` and ``Dispatcher`` that contains new updates which can
            be used to insert updates. Default is ``False``.
        pass_job_queue (optional[bool]): If set to ``True``, a keyword argument called
            ``job_queue`` will be passed to the callback function. It will be a ``JobQueue``
            instance created by the ``Updater`` which can be used to schedule new jobs.
            Default is ``False``.
        pattern (optional[str or Pattern]): Optional regex pattern. If not ``None`` ``re.match``
            is used to determine if an update should be handled by this handler.
        pass_groups (optional[bool]): If the callback should be passed the
            result of ``re.match(pattern, data).groups()`` as a keyword
            argument called ``groups``. Default is ``False``
        pass_groupdict (optional[bool]): If the callback should be passed the
            result of ``re.match(pattern, data).groupdict()`` as a keyword
            argument called ``groupdict``. Default is ``False``
        pass_user_data (optional[bool]): If set to ``True``, a keyword argument called
            ``user_data`` will be passed to the callback function. It will be a ``dict`` you
            can use to keep any data related to the user that sent the update. For each update of
            the same user, it will be the same ``dict``. Default is ``False``.
        pass_chat_data (optional[bool]): If set to ``True``, a keyword argument called
            ``chat_data`` will be passed to the callback function. It will be a ``dict`` you
            can use to keep any data related to the chat that the update was sent in.
            For each update in the same chat, it will be the same ``dict``. Default is ``False``.
    """

    def __init__(self,
                 callback,
                 pass_update_queue=False,
                 pass_job_queue=False,
                 pattern=None,
                 pass_groups=False,
                 pass_groupdict=False,
                 pass_user_data=False,
                 pass_chat_data=False):
        super(CallbackQueryHandler, self).__init__(
            callback,
            pass_update_queue=pass_update_queue,
            pass_job_queue=pass_job_queue,
            pass_user_data=pass_user_data,
            pass_chat_data=pass_chat_data)

        if isinstance(pattern, string_types):
            pattern = re.compile(pattern)

        self.pattern = pattern
        self.pass_groups = pass_groups
        self.pass_groupdict = pass_groupdict

    def check_update(self, update):
        if isinstance(update, Update) and update.callback_query:
            if self.pattern:
                if update.callback_query.data:
                    match = re.match(self.pattern, update.callback_query.data)
                    return bool(match)
            else:
                return True

    def handle_update(self, update, dispatcher):
        optional_args = self.collect_optional_args(dispatcher, update)
        if self.pattern:
            match = re.match(self.pattern, update.callback_query.data)

            if self.pass_groups:
                optional_args['groups'] = match.groups()
            if self.pass_groupdict:
                optional_args['groupdict'] = match.groupdict()

        return self.callback(dispatcher.bot, update, **optional_args)