#  Hydrogram - Telegram MTProto API Client Library for Python
#  Copyright (C) 2017-2023 Dan <https://github.com/delivrance>
#  Copyright (C) 2023-present Hydrogram <https://hydrogram.org>
#
#  This file is part of Hydrogram.
#
#  Hydrogram is free software: you can redistribute it and/or modify
#  it under the terms of the GNU Lesser General Public License as published
#  by the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  Hydrogram 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 General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public License
#  along with Hydrogram.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import annotations

import hydrogram
from hydrogram import raw, types
from hydrogram.errors import UserNotParticipant


class GetChatMember:
    async def get_chat_member(
        self: hydrogram.Client, chat_id: int | str, user_id: int | str
    ) -> types.ChatMember:
        """Get information about one member of a chat.

        .. include:: /_includes/usable-by/users-bots.rst

        Parameters:
            chat_id (``int`` | ``str``):
                Unique identifier (int) or username (str) of the target chat.

            user_id (``int`` | ``str``)::
                Unique identifier (int) or username (str) of the target user.
                For you yourself you can simply use "me" or "self".
                For a contact that exists in your Telegram address book you can use his phone number (str).

        Returns:
            :obj:`~hydrogram.types.ChatMember`: On success, a chat member is returned.

        Example:
            .. code-block:: python

                member = await app.get_chat_member(chat_id, "me")
                print(member)
        """
        chat = await self.resolve_peer(chat_id)
        user = await self.resolve_peer(user_id)

        if isinstance(chat, raw.types.InputPeerChat):
            r = await self.invoke(raw.functions.messages.GetFullChat(chat_id=chat.chat_id))

            members = getattr(r.full_chat.participants, "participants", [])
            users = {i.id: i for i in r.users}

            for member in members:
                member = types.ChatMember._parse(self, member, users, {})

                if isinstance(user, raw.types.InputPeerSelf):
                    if member.user.is_self:
                        return member
                elif member.user.id == user.user_id:
                    return member
            raise UserNotParticipant
        if isinstance(chat, raw.types.InputPeerChannel):
            r = await self.invoke(
                raw.functions.channels.GetParticipant(channel=chat, participant=user)
            )

            users = {i.id: i for i in r.users}
            chats = {i.id: i for i in r.chats}

            return types.ChatMember._parse(self, r.participant, users, chats)
        raise ValueError(f'The chat_id "{chat_id}" belongs to a user')
