#  Pyrogram - Telegram MTProto API Client Library for Python
#  Copyright (C) 2017-present Dan <https://github.com/delivrance>
#
#  This file is part of Pyrogram.
#
#  Pyrogram 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.
#
#  Pyrogram 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 Pyrogram.  If not, see <http://www.gnu.org/licenses/>.

from datetime import datetime
from typing import Dict, Optional, Union

import pyrogram
from pyrogram import raw, utils
from pyrogram import types
from ..object import Object
from ..update import Update


class ChatMemberUpdated(Object, Update):
    """Represents changes in the status of a chat member.

    Parameters:
        chat (:obj:`~pyrogram.types.Chat`):
            Chat the user belongs to.

        from_user (:obj:`~pyrogram.types.User`):
            Performer of the action, which resulted in the change.

        date (:py:obj:`~datetime.datetime`):
            Date the change was done.

        old_chat_member (:obj:`~pyrogram.types.ChatMember`, *optional*):
            Previous information about the chat member.

        new_chat_member (:obj:`~pyrogram.types.ChatMember`, *optional*):
            New information about the chat member.

        invite_link (:obj:`~pyrogram.types.ChatInviteLink`, *optional*):
            Chat invite link, which was used by the user to join the chat; for joining by invite link events only.

        via_join_request (``bool``, *optional*):
            True, if the user joined the chat after sending a join request and being approved by an administrator.
    """

    def __init__(
        self,
        *,
        client: "pyrogram.Client" = None,
        chat: "types.Chat",
        from_user: "types.User",
        date: datetime,
        old_chat_member: Optional["types.ChatMember"] = None,
        new_chat_member: Optional["types.ChatMember"] = None,
        invite_link: Optional["types.ChatInviteLink"] = None,
        via_join_request: Optional[bool] = None
    ):
        super().__init__(client)

        self.chat = chat
        self.from_user = from_user
        self.date = date
        self.old_chat_member = old_chat_member
        self.new_chat_member = new_chat_member
        self.invite_link = invite_link
        self.via_join_request = via_join_request

    @staticmethod
    def _parse(
        client: "pyrogram.Client",
        update: Union["raw.types.UpdateChatParticipant", "raw.types.UpdateChannelParticipant"],
        users: Dict[int, "raw.types.User"],
        chats: Dict[int, "raw.types.Chat"]
    ) -> "ChatMemberUpdated":
        chat_id = getattr(update, "chat_id", None) or getattr(update, "channel_id")

        old_chat_member = None
        new_chat_member = None
        invite_link = None
        via_join_request = None

        if update.prev_participant:
            old_chat_member = types.ChatMember._parse(client, update.prev_participant, users, chats)

        if update.new_participant:
            new_chat_member = types.ChatMember._parse(client, update.new_participant, users, chats)

        if update.invite:
            invite_link = types.ChatInviteLink._parse(client, update.invite, users)

            if isinstance(update.invite, raw.types.ChatInvitePublicJoinRequests):
                via_join_request = True

        return ChatMemberUpdated(
            chat=types.Chat._parse_chat(client, chats[chat_id]),
            from_user=types.User._parse(client, users[update.actor_id]),
            date=utils.timestamp_to_datetime(update.date),
            old_chat_member=old_chat_member,
            new_chat_member=new_chat_member,
            invite_link=invite_link,
            via_join_request=via_join_request,
            client=client
        )
