#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2023
# 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 an object that represents a Telegram Poll."""
import datetime
from typing import TYPE_CHECKING, Dict, Final, List, Optional, Sequence, Tuple

from telegram import constants
from telegram._chat import Chat
from telegram._messageentity import MessageEntity
from telegram._telegramobject import TelegramObject
from telegram._user import User
from telegram._utils import enum
from telegram._utils.argumentparsing import parse_sequence_arg
from telegram._utils.datetime import extract_tzinfo_from_defaults, from_timestamp
from telegram._utils.types import JSONDict
from telegram._utils.warnings import warn
from telegram.warnings import PTBDeprecationWarning

if TYPE_CHECKING:
    from telegram import Bot


class PollOption(TelegramObject):
    """
    This object contains information about one answer option in a poll.

    Objects of this class are comparable in terms of equality. Two objects of this class are
    considered equal, if their :attr:`text` and :attr:`voter_count` are equal.

    Args:
        text (:obj:`str`): Option text,
            :tg-const:`telegram.PollOption.MIN_LENGTH`-:tg-const:`telegram.PollOption.MAX_LENGTH`
            characters.
        voter_count (:obj:`int`): Number of users that voted for this option.

    Attributes:
        text (:obj:`str`): Option text,
            :tg-const:`telegram.PollOption.MIN_LENGTH`-:tg-const:`telegram.PollOption.MAX_LENGTH`
            characters.
        voter_count (:obj:`int`): Number of users that voted for this option.

    """

    __slots__ = ("voter_count", "text")

    def __init__(self, text: str, voter_count: int, *, api_kwargs: Optional[JSONDict] = None):
        super().__init__(api_kwargs=api_kwargs)
        self.text: str = text
        self.voter_count: int = voter_count

        self._id_attrs = (self.text, self.voter_count)

        self._freeze()

    MIN_LENGTH: Final[int] = constants.PollLimit.MIN_OPTION_LENGTH
    """:const:`telegram.constants.PollLimit.MIN_OPTION_LENGTH`

    .. versionadded:: 20.0
    """
    MAX_LENGTH: Final[int] = constants.PollLimit.MAX_OPTION_LENGTH
    """:const:`telegram.constants.PollLimit.MAX_OPTION_LENGTH`

    .. versionadded:: 20.0
    """


class PollAnswer(TelegramObject):
    """
    This object represents an answer of a user in a non-anonymous poll.

    Objects of this class are comparable in terms of equality. Two objects of this class are
    considered equal, if their :attr:`poll_id`, :attr:`user` and :attr:`option_ids` are equal.

    .. versionchanged:: 20.5
        The order of :paramref:`option_ids` and :paramref:`user` is changed in
        20.5 as the latter one became optional. We currently provide
        backward compatibility for this but it will be removed in the future.
        Please update your code to use the new order.

    Args:
        poll_id (:obj:`str`): Unique poll identifier.
        option_ids (Sequence[:obj:`int`]): Identifiers of answer options, chosen by the user. May
            be empty if the user retracted their vote.

            .. versionchanged:: 20.0
                |sequenceclassargs|
        user (:class:`telegram.User`, optional): The user that changed the answer to the poll,
            if the voter isn't anonymous. If the voter is anonymous, this field will contain the
            user :tg-const:`telegram.constants.ChatID.FAKE_CHANNEL` for backwards compatibility.

            .. versionchanged:: 20.5
                :paramref:`user` became optional.
        voter_chat (:class:`telegram.Chat`, optional): The chat that changed the answer to the
            poll, if the voter is anonymous.

            .. versionadded:: 20.5

    Attributes:
        poll_id (:obj:`str`): Unique poll identifier.
        option_ids (Tuple[:obj:`int`]): Identifiers of answer options, chosen by the user. May
            be empty if the user retracted their vote.

            .. versionchanged:: 20.0
                |tupleclassattrs|
        user (:class:`telegram.User`): Optional. The user, who changed the answer to the
            poll, if the voter isn't anonymous. If the voter is anonymous, this field will contain
            the user :tg-const:`telegram.constants.ChatID.FAKE_CHANNEL` for backwards compatibility

            .. versionchanged:: 20.5
                :paramref:`user` became optional.
        voter_chat (:class:`telegram.Chat`): Optional. The chat that changed the answer to the
            poll, if the voter is anonymous.

            .. versionadded:: 20.5

    """

    __slots__ = ("option_ids", "poll_id", "user", "voter_chat")

    def __init__(
        self,
        poll_id: str,
        option_ids: Sequence[int],
        user: Optional[User] = None,
        voter_chat: Optional[Chat] = None,
        *,
        api_kwargs: Optional[JSONDict] = None,
    ):
        super().__init__(api_kwargs=api_kwargs)
        self.poll_id: str = poll_id
        self.voter_chat: Optional[Chat] = voter_chat

        if isinstance(option_ids, User) or isinstance(user, tuple):
            warn(
                "From v20.5 the order of `option_ids` and `user` is changed as the latter one"
                " became optional. Please update your code to use the new order.",
                category=PTBDeprecationWarning,
                stacklevel=2,
            )
            self.option_ids: Tuple[int, ...] = parse_sequence_arg(user)
            self.user: Optional[User] = option_ids
        else:
            self.option_ids: Tuple[int, ...] = parse_sequence_arg(  # type: ignore[no-redef]
                option_ids
            )
            self.user: Optional[User] = user  # type: ignore[no-redef]

        self._id_attrs = (
            self.poll_id,
            self.option_ids,
            self.user,
            self.voter_chat,
        )

        self._freeze()

    @classmethod
    def de_json(cls, data: Optional[JSONDict], bot: "Bot") -> Optional["PollAnswer"]:
        """See :meth:`telegram.TelegramObject.de_json`."""
        data = cls._parse_data(data)

        if not data:
            return None

        data["user"] = User.de_json(data.get("user"), bot)
        data["voter_chat"] = Chat.de_json(data.get("voter_chat"), bot)

        return super().de_json(data=data, bot=bot)


class Poll(TelegramObject):
    """
    This object contains information about a poll.

    Objects of this class are comparable in terms of equality. Two objects of this class are
    considered equal, if their :attr:`id` is equal.

    Examples:
        :any:`Poll Bot <examples.pollbot>`

    Args:
        id (:obj:`str`): Unique poll identifier.
        question (:obj:`str`): Poll question, :tg-const:`telegram.Poll.MIN_QUESTION_LENGTH`-
            :tg-const:`telegram.Poll.MAX_QUESTION_LENGTH` characters.
        options (Sequence[:class:`~telegram.PollOption`]): List of poll options.

            .. versionchanged:: 20.0
                |sequenceclassargs|
        is_closed (:obj:`bool`): :obj:`True`, if the poll is closed.
        is_anonymous (:obj:`bool`): :obj:`True`, if the poll is anonymous.
        type (:obj:`str`): Poll type, currently can be :attr:`REGULAR` or :attr:`QUIZ`.
        allows_multiple_answers (:obj:`bool`): :obj:`True`, if the poll allows multiple answers.
        correct_option_id (:obj:`int`, optional): A zero based identifier of the correct answer
            option. Available only for closed polls in the quiz mode, which were sent
            (not forwarded), by the bot or to a private chat with the bot.
        explanation (:obj:`str`, optional): Text that is shown when a user chooses an incorrect
            answer or taps on the lamp icon in a quiz-style poll,
            0-:tg-const:`telegram.Poll.MAX_EXPLANATION_LENGTH` characters.
        explanation_entities (Sequence[:class:`telegram.MessageEntity`], optional): Special
            entities like usernames, URLs, bot commands, etc. that appear in the
            :attr:`explanation`. This list is empty if the message does not contain explanation
            entities.

            .. versionchanged:: 20.0

               * This attribute is now always a (possibly empty) list and never :obj:`None`.
               * |sequenceclassargs|
        open_period (:obj:`int`, optional): Amount of time in seconds the poll will be active
            after creation.
        close_date (:obj:`datetime.datetime`, optional): Point in time (Unix timestamp) when the
            poll will be automatically closed. Converted to :obj:`datetime.datetime`.

            .. versionchanged:: 20.3
                |datetime_localization|

    Attributes:
        id (:obj:`str`): Unique poll identifier.
        question (:obj:`str`): Poll question, :tg-const:`telegram.Poll.MIN_QUESTION_LENGTH`-
            :tg-const:`telegram.Poll.MAX_QUESTION_LENGTH` characters.
        options (Tuple[:class:`~telegram.PollOption`]): List of poll options.

            .. versionchanged:: 20.0
                |tupleclassattrs|
        total_voter_count (:obj:`int`): Total number of users that voted in the poll.
        is_closed (:obj:`bool`): :obj:`True`, if the poll is closed.
        is_anonymous (:obj:`bool`): :obj:`True`, if the poll is anonymous.
        type (:obj:`str`): Poll type, currently can be :attr:`REGULAR` or :attr:`QUIZ`.
        allows_multiple_answers (:obj:`bool`): :obj:`True`, if the poll allows multiple answers.
        correct_option_id (:obj:`int`): Optional. A zero based identifier of the correct answer
            option. Available only for closed polls in the quiz mode, which were sent
            (not forwarded), by the bot or to a private chat with the bot.
        explanation (:obj:`str`): Optional. Text that is shown when a user chooses an incorrect
            answer or taps on the lamp icon in a quiz-style poll,
            0-:tg-const:`telegram.Poll.MAX_EXPLANATION_LENGTH` characters.
        explanation_entities (Tuple[:class:`telegram.MessageEntity`]): Special entities
            like usernames, URLs, bot commands, etc. that appear in the :attr:`explanation`.
            This list is empty if the message does not contain explanation entities.

            .. versionchanged:: 20.0
                |tupleclassattrs|

            .. versionchanged:: 20.0
               This attribute is now always a (possibly empty) list and never :obj:`None`.
        open_period (:obj:`int`): Optional. Amount of time in seconds the poll will be active
            after creation.
        close_date (:obj:`datetime.datetime`): Optional. Point in time when the poll will be
            automatically closed.

            .. versionchanged:: 20.3
                |datetime_localization|

    """

    __slots__ = (
        "total_voter_count",
        "allows_multiple_answers",
        "open_period",
        "options",
        "type",
        "explanation_entities",
        "is_anonymous",
        "close_date",
        "is_closed",
        "id",
        "explanation",
        "question",
        "correct_option_id",
    )

    def __init__(
        self,
        id: str,  # pylint: disable=redefined-builtin
        question: str,
        options: Sequence[PollOption],
        total_voter_count: int,
        is_closed: bool,
        is_anonymous: bool,
        type: str,  # pylint: disable=redefined-builtin
        allows_multiple_answers: bool,
        correct_option_id: Optional[int] = None,
        explanation: Optional[str] = None,
        explanation_entities: Optional[Sequence[MessageEntity]] = None,
        open_period: Optional[int] = None,
        close_date: Optional[datetime.datetime] = None,
        *,
        api_kwargs: Optional[JSONDict] = None,
    ):
        super().__init__(api_kwargs=api_kwargs)
        self.id: str = id
        self.question: str = question
        self.options: Tuple[PollOption, ...] = parse_sequence_arg(options)
        self.total_voter_count: int = total_voter_count
        self.is_closed: bool = is_closed
        self.is_anonymous: bool = is_anonymous
        self.type: str = enum.get_member(constants.PollType, type, type)
        self.allows_multiple_answers: bool = allows_multiple_answers
        self.correct_option_id: Optional[int] = correct_option_id
        self.explanation: Optional[str] = explanation
        self.explanation_entities: Tuple[MessageEntity, ...] = parse_sequence_arg(
            explanation_entities
        )
        self.open_period: Optional[int] = open_period
        self.close_date: Optional[datetime.datetime] = close_date

        self._id_attrs = (self.id,)

        self._freeze()

    @classmethod
    def de_json(cls, data: Optional[JSONDict], bot: "Bot") -> Optional["Poll"]:
        """See :meth:`telegram.TelegramObject.de_json`."""
        data = cls._parse_data(data)

        if not data:
            return None

        # Get the local timezone from the bot if it has defaults
        loc_tzinfo = extract_tzinfo_from_defaults(bot)

        data["options"] = [PollOption.de_json(option, bot) for option in data["options"]]
        data["explanation_entities"] = MessageEntity.de_list(data.get("explanation_entities"), bot)
        data["close_date"] = from_timestamp(data.get("close_date"), tzinfo=loc_tzinfo)

        return super().de_json(data=data, bot=bot)

    def parse_explanation_entity(self, entity: MessageEntity) -> str:
        """Returns the text from a given :class:`telegram.MessageEntity`.

        Note:
            This method is present because Telegram calculates the offset and length in
            UTF-16 codepoint pairs, which some versions of Python don't handle automatically.
            (That is, you can't just slice ``Message.text`` with the offset and length.)

        Args:
            entity (:class:`telegram.MessageEntity`): The entity to extract the text from. It must
                be an entity that belongs to this message.

        Returns:
            :obj:`str`: The text of the given entity.

        Raises:
            RuntimeError: If the poll has no explanation.

        """
        if not self.explanation:
            raise RuntimeError("This Poll has no 'explanation'.")

        entity_text = self.explanation.encode("utf-16-le")
        entity_text = entity_text[entity.offset * 2 : (entity.offset + entity.length) * 2]

        return entity_text.decode("utf-16-le")

    def parse_explanation_entities(
        self, types: Optional[List[str]] = None
    ) -> Dict[MessageEntity, str]:
        """
        Returns a :obj:`dict` that maps :class:`telegram.MessageEntity` to :obj:`str`.
        It contains entities from this polls explanation filtered by their ``type`` attribute as
        the key, and the text that each entity belongs to as the value of the :obj:`dict`.

        Note:
            This method should always be used instead of the :attr:`explanation_entities`
            attribute, since it calculates the correct substring from the message text based on
            UTF-16 codepoints. See :attr:`parse_explanation_entity` for more info.

        Args:
            types (List[:obj:`str`], optional): List of ``MessageEntity`` types as strings. If the
                    ``type`` attribute of an entity is contained in this list, it will be returned.
                    Defaults to :attr:`telegram.MessageEntity.ALL_TYPES`.

        Returns:
            Dict[:class:`telegram.MessageEntity`, :obj:`str`]: A dictionary of entities mapped to
            the text that belongs to them, calculated based on UTF-16 codepoints.

        """
        if types is None:
            types = MessageEntity.ALL_TYPES

        return {
            entity: self.parse_explanation_entity(entity)
            for entity in self.explanation_entities
            if entity.type in types
        }

    REGULAR: Final[str] = constants.PollType.REGULAR
    """:const:`telegram.constants.PollType.REGULAR`"""
    QUIZ: Final[str] = constants.PollType.QUIZ
    """:const:`telegram.constants.PollType.QUIZ`"""
    MAX_EXPLANATION_LENGTH: Final[int] = constants.PollLimit.MAX_EXPLANATION_LENGTH
    """:const:`telegram.constants.PollLimit.MAX_EXPLANATION_LENGTH`

    .. versionadded:: 20.0
    """
    MAX_EXPLANATION_LINE_FEEDS: Final[int] = constants.PollLimit.MAX_EXPLANATION_LINE_FEEDS
    """:const:`telegram.constants.PollLimit.MAX_EXPLANATION_LINE_FEEDS`

    .. versionadded:: 20.0
    """
    MIN_OPEN_PERIOD: Final[int] = constants.PollLimit.MIN_OPEN_PERIOD
    """:const:`telegram.constants.PollLimit.MIN_OPEN_PERIOD`

    .. versionadded:: 20.0
    """
    MAX_OPEN_PERIOD: Final[int] = constants.PollLimit.MAX_OPEN_PERIOD
    """:const:`telegram.constants.PollLimit.MAX_OPEN_PERIOD`

    .. versionadded:: 20.0
    """
    MIN_QUESTION_LENGTH: Final[int] = constants.PollLimit.MIN_QUESTION_LENGTH
    """:const:`telegram.constants.PollLimit.MIN_QUESTION_LENGTH`

    .. versionadded:: 20.0
    """
    MAX_QUESTION_LENGTH: Final[int] = constants.PollLimit.MAX_QUESTION_LENGTH
    """:const:`telegram.constants.PollLimit.MAX_QUESTION_LENGTH`

    .. versionadded:: 20.0
    """
    MIN_OPTION_LENGTH: Final[int] = constants.PollLimit.MIN_OPTION_LENGTH
    """:const:`telegram.constants.PollLimit.MIN_OPTION_LENGTH`

    .. versionadded:: 20.0
    """
    MAX_OPTION_LENGTH: Final[int] = constants.PollLimit.MAX_OPTION_LENGTH
    """:const:`telegram.constants.PollLimit.MAX_OPTION_LENGTH`

    .. versionadded:: 20.0
    """
    MIN_OPTION_NUMBER: Final[int] = constants.PollLimit.MIN_OPTION_NUMBER
    """:const:`telegram.constants.PollLimit.MIN_OPTION_NUMBER`

    .. versionadded:: 20.0
    """
    MAX_OPTION_NUMBER: Final[int] = constants.PollLimit.MAX_OPTION_NUMBER
    """:const:`telegram.constants.PollLimit.MAX_OPTION_NUMBER`

    .. versionadded:: 20.0
    """