# 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 binascii
import logging
import os
import struct
from typing import Union, List
import asyncio

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

log = logging.getLogger(__name__)


class SendMediaGroup(BaseClient):
    # TODO: Add progress parameter
    # TODO: Figure out how to send albums using URLs
    async def send_media_group(
        self,
        chat_id: Union[int, str],
        media: List[Union["pyrogram.InputMediaPhoto", "pyrogram.InputMediaVideo"]],
        disable_notification: bool = None,
        reply_to_message_id: int = None
    ):
        """Send a group of photos or videos as an album.

        Parameters:
            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 of :obj:`InputMediaPhoto` and :obj:`InputMediaVideo`):
                A list 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.

        Returns:
            :obj:`Messages`: On success, an object is returned containing all the single messages sent.

        Raises:
            RPCError: In case of a Telegram RPC error.
        """
        multi_media = []

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

            if isinstance(i, pyrogram.InputMediaPhoto):
                if os.path.exists(i.media):
                    while True:
                        try:
                            media = await self.send(
                                functions.messages.UploadMedia(
                                    peer=await self.resolve_peer(chat_id),
                                    media=types.InputMediaUploadedPhoto(
                                        file=await self.save_file(i.media)
                                    )
                                )
                            )
                        except FloodWait as e:
                            log.warning("Sleeping for {}s".format(e.x))
                            await asyncio.sleep(e.x)
                        else:
                            break

                    media = types.InputMediaPhoto(
                        id=types.InputPhoto(
                            id=media.photo.id,
                            access_hash=media.photo.access_hash,
                            file_reference=b""
                        )
                    )
                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],
                                file_reference=b""
                            )
                        )
            elif isinstance(i, pyrogram.InputMediaVideo):
                if os.path.exists(i.media):
                    while True:
                        try:
                            media = await self.send(
                                functions.messages.UploadMedia(
                                    peer=await self.resolve_peer(chat_id),
                                    media=types.InputMediaUploadedDocument(
                                        file=await self.save_file(i.media),
                                        thumb=None if i.thumb is None else self.save_file(i.thumb),
                                        mime_type=self.guess_mime_type(i.media) or "video/mp4",
                                        attributes=[
                                            types.DocumentAttributeVideo(
                                                supports_streaming=i.supports_streaming or None,
                                                duration=i.duration,
                                                w=i.width,
                                                h=i.height
                                            ),
                                            types.DocumentAttributeFilename(file_name=os.path.basename(i.media))
                                        ]
                                    )
                                )
                            )
                        except FloodWait as e:
                            log.warning("Sleeping for {}s".format(e.x))
                            await asyncio.sleep(e.x)
                        else:
                            break

                    media = types.InputMediaDocument(
                        id=types.InputDocument(
                            id=media.document.id,
                            access_hash=media.document.access_hash,
                            file_reference=b""
                        )
                    )
                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],
                                file_reference=b""
                            )
                        )

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

        while True:
            try:
                r = 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
                    )
                )
            except FloodWait as e:
                log.warning("Sleeping for {}s".format(e.x))
                await asyncio.sleep(e.x)
            else:
                break

        return await pyrogram.Messages._parse(
            self,
            types.messages.Messages(
                messages=[m.message for m in filter(
                    lambda u: isinstance(u, (types.UpdateNewMessage, types.UpdateNewChannelMessage)),
                    r.updates
                )],
                users=r.users,
                chats=r.chats
            )
        )