#  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


class JoinChat:
    async def join_chat(self: hydrogram.Client, chat_id: int | str) -> types.Chat:
        """Join a group chat or channel.

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

        Parameters:
            chat_id (``int`` | ``str``):
                Unique identifier for the target chat in form of a *t.me/joinchat/* link, a username of the target
                channel/supergroup (in the format @username) or a chat id of a linked chat (channel or supergroup).

        Returns:
            :obj:`~hydrogram.types.Chat`: On success, a chat object is returned.

        Example:
            .. code-block:: python

                # Join chat via invite link
                await app.join_chat("https://t.me/+AbCdEf0123456789")

                # Join chat via username
                await app.join_chat("hydrogram")

                # Join a linked chat
                await app.join_chat(app.get_chat("hydrogram").linked_chat.id)
        """
        if match := self.INVITE_LINK_RE.match(str(chat_id)):
            chat = await self.invoke(raw.functions.messages.ImportChatInvite(hash=match.group(1)))
            if isinstance(chat.chats[0], raw.types.Chat):
                return types.Chat._parse_chat_chat(self, chat.chats[0])
            if isinstance(chat.chats[0], raw.types.Channel):
                return types.Chat._parse_channel_chat(self, chat.chats[0])
            return None

        chat = await self.invoke(
            raw.functions.channels.JoinChannel(channel=await self.resolve_peer(chat_id))
        )

        return types.Chat._parse_channel_chat(self, chat.chats[0])