import logging

from aiogram.types import ChatMemberUpdated

from src import dependencies
from src.controller.telegram_callback import telegram_callback_router

log = logging.getLogger(__name__)


@telegram_callback_router.chat_member()
async def on_chat_member_updated(event: ChatMemberUpdated) -> None:
    if event.chat.type not in {'channel', 'supergroup'}:
        return

    if not event.from_user:
        log.error('Failed to get user data from chat member update')
        return

    old_status = event.old_chat_member.status
    new_status = event.new_chat_member.status

    # Проверяем что пользователь присоединился к каналу
    was_not_member = old_status in ('left', 'kicked')
    is_now_member = new_status in ('member', 'administrator', 'creator')
    user_joined = was_not_member and is_now_member

    # Проверяем что пользователь покинул канал
    was_member = old_status in ('member', 'administrator', 'creator', 'restricted')
    is_now_not_member = new_status in ('left', 'kicked')
    user_left = was_member and is_now_not_member

    usecase = dependencies.get_usecase()

    if user_joined:
        invite_link = event.invite_link.invite_link if event.invite_link else None
        if not invite_link:
            log.debug('No invite_link in chat member update event')
            return

        await usecase.handle_subscription(
            user_telegram_id=event.from_user.id, username=event.from_user.username, invite_link=invite_link
        )

    elif user_left:
        await usecase.handle_unsubscription(user_telegram_id=event.from_user.id, channel_telegram_id=event.chat.id)