# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2019 Dan Tès <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/>.

import os
from struct import unpack
from typing import Union

from pyrogram.api import functions, types
from ...ext import BaseClient, utils


class SetChatPhoto(BaseClient):
    def set_chat_photo(
        self,
        chat_id: Union[int, str],
        photo: str
    ) -> bool:
        """Set a new profile photo for the chat.

        You must be an administrator in the chat for this to work and must have the appropriate admin rights.

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

            photo (``str``):
                New chat photo. You can pass a :obj:`Photo` file_id or a file path to upload a new photo from your local
                machine.

        Returns:
            ``bool``: True on success.

        Raises:
            ValueError: if a chat_id belongs to user.

        Example:
            .. code-block:: python

                # Set chat photo using a local file
                app.set_chat_photo(chat_id, "photo.jpg")

                # Set chat photo using an exiting Photo file_id
                app.set_chat_photo(chat_id, photo.file_id)
        """
        peer = self.resolve_peer(chat_id)

        if os.path.exists(photo):
            photo = types.InputChatUploadedPhoto(file=self.save_file(photo))
        else:
            unpacked = unpack("<iiqqc", utils.decode(photo))

            photo = types.InputChatPhoto(
                id=types.InputPhoto(
                    id=unpacked[2],
                    access_hash=unpacked[3],
                    file_reference=b""
                )
            )

        if isinstance(peer, types.InputPeerChat):
            self.send(
                functions.messages.EditChatPhoto(
                    chat_id=peer.chat_id,
                    photo=photo
                )
            )
        elif isinstance(peer, types.InputPeerChannel):
            self.send(
                functions.channels.EditPhoto(
                    channel=peer,
                    photo=photo
                )
            )
        else:
            raise ValueError("The chat_id \"{}\" belongs to a user".format(chat_id))

        return True