# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2018 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 binascii
import mimetypes
import os
import struct

from pyrogram.api import functions, types
from pyrogram.api.errors import FileIdInvalid
from pyrogram.client import types as pyrogram_types
from pyrogram.client.ext import BaseClient, utils


class SendMediaGroup(BaseClient):
    # TODO: Add progress parameter
    # TODO: Return new Message object
    # TODO: Figure out how to send albums using URLs
    async def send_media_group(self,
                               chat_id: int or str,
                               media: list,
                               disable_notification: bool = None,
                               reply_to_message_id: int = None):
        """Use this method to send a group of photos or videos as an album.
        On success, an Update containing the sent Messages is returned.

        Args:
            chat_id (``int`` | ``str``):
                Unique identifier (int) or username (str) of the target chat.
                For your personal cloud (Saved Messages) you can simply use "me" or "self".
                For a contact that exists in your Telegram address book you can use his phone number (str).

            media (``list``):
                A list containing either :obj:`InputMediaPhoto <pyrogram.InputMediaPhoto>` or
                :obj:`InputMediaVideo <pyrogram.InputMediaVideo>` objects
                describing photos and videos to be sent, must include 2–10 items.

            disable_notification (``bool``, *optional*):
                Sends the message silently.
                Users will receive a notification with no sound.

            reply_to_message_id (``int``, *optional*):
                If the message is a reply, ID of the original message.
        """
        multi_media = []

        for i in media:
            style = self.html if i.parse_mode.lower() == "html" else self.markdown

            if isinstance(i, pyrogram_types.InputMediaPhoto):
                if os.path.exists(i.media):
                    media = await self.send(
                        functions.messages.UploadMedia(
                            peer=await self.resolve_peer(chat_id),
                            media=types.InputMediaUploadedPhoto(
                                file=await self.save_file(i.media)
                            )
                        )
                    )

                    media = types.InputMediaPhoto(
                        id=types.InputPhoto(
                            id=media.photo.id,
                            access_hash=media.photo.access_hash
                        )
                    )
                else:
                    try:
                        decoded = utils.decode(i.media)
                        fmt = "<iiqqqqi" if len(decoded) > 24 else "<iiqq"
                        unpacked = struct.unpack(fmt, decoded)
                    except (AssertionError, binascii.Error, struct.error):
                        raise FileIdInvalid from None
                    else:
                        if unpacked[0] != 2:
                            media_type = BaseClient.MEDIA_TYPE_ID.get(unpacked[0], None)

                            if media_type:
                                raise FileIdInvalid("The file_id belongs to a {}".format(media_type))
                            else:
                                raise FileIdInvalid("Unknown media type: {}".format(unpacked[0]))

                        media = types.InputMediaPhoto(
                            id=types.InputPhoto(
                                id=unpacked[2],
                                access_hash=unpacked[3]
                            )
                        )
            elif isinstance(i, pyrogram_types.InputMediaVideo):
                if os.path.exists(i.media):
                    media = await self.send(
                        functions.messages.UploadMedia(
                            peer=await self.resolve_peer(chat_id),
                            media=types.InputMediaUploadedDocument(
                                file=await self.save_file(i.media),
                                mime_type=mimetypes.types_map[".mp4"],
                                attributes=[
                                    types.DocumentAttributeVideo(
                                        supports_streaming=i.supports_streaming or None,
                                        duration=i.duration,
                                        w=i.width,
                                        h=i.height
                                    ),
                                    types.DocumentAttributeFilename(os.path.basename(i.media))
                                ]
                            )
                        )
                    )

                    media = types.InputMediaDocument(
                        id=types.InputDocument(
                            id=media.document.id,
                            access_hash=media.document.access_hash
                        )
                    )
                else:
                    try:
                        decoded = utils.decode(i.media)
                        fmt = "<iiqqqqi" if len(decoded) > 24 else "<iiqq"
                        unpacked = struct.unpack(fmt, decoded)
                    except (AssertionError, binascii.Error, struct.error):
                        raise FileIdInvalid from None
                    else:
                        if unpacked[0] != 4:
                            media_type = BaseClient.MEDIA_TYPE_ID.get(unpacked[0], None)

                            if media_type:
                                raise FileIdInvalid("The file_id belongs to a {}".format(media_type))
                            else:
                                raise FileIdInvalid("Unknown media type: {}".format(unpacked[0]))

                        media = types.InputMediaDocument(
                            id=types.InputDocument(
                                id=unpacked[2],
                                access_hash=unpacked[3]
                            )
                        )

            multi_media.append(
                types.InputSingleMedia(
                    media=media,
                    random_id=self.rnd_id(),
                    **style.parse(i.caption)
                )
            )

        return await self.send(
            functions.messages.SendMultiMedia(
                peer=await self.resolve_peer(chat_id),
                multi_media=multi_media,
                silent=disable_notification or None,
                reply_to_msg_id=reply_to_message_id
            )
        )