import io
from typing import Optional

from aiogram import Bot
from aiogram.enums import ContentType
from aiogram.types import User, PhotoSize, Message

import ai_agent
import utils


async def get_user_name_for_ai(user: User):
    if user.first_name and user.last_name:
        return "{} {}".format(user.first_name, user.last_name)
    elif user.first_name:
        return user.first_name
    elif user.username:
        return user.username
    else:
        return str(user.id)


async def download_photo(photo: PhotoSize, bot: Bot) -> bytes:
    # noinspection PyTypeChecker
    photo_bytes: io.BytesIO = await bot.download(photo.file_id)
    return photo_bytes.getvalue()


def get_message_text(message: Message) -> Optional[str]:
    if message.content_type == ContentType.TEXT:
        return message.text
    elif message.content_type == ContentType.PHOTO:
        return message.caption
    else:
        return None


async def create_ai_message(message: Message, bot: Bot) -> ai_agent.Message:
    ai_message = ai_agent.Message()
    ai_message.message_id = message.message_id
    ai_message.user_name = await get_user_name_for_ai(message.from_user)
    if message.content_type == ContentType.TEXT:
        ai_message.text = message.text
    elif message.content_type == ContentType.PHOTO:
        if message.media_group_id is None:
            ai_message.text = message.caption
            ai_message.image = await download_photo(message.photo[-1], bot)
        else:
            raise utils.UnsupportedContentType()
    else:
        raise utils.UnsupportedContentType()
    return ai_message