from services.redis import redis
import json

from services.auth import login_required


async def get_unread_counter(chat_id: str, author_id: int):
    try:
        unread = await redis.execute(
            "LLEN", f"chats/{chat_id.decode('utf-8')}/unread/{author_id}"
        )
        if unread:
            return unread
    except Exception:
        return 0


async def get_total_unread_counter(author_id: int):
    chats = await redis.execute("GET", f"chats_by_author/{author_id}")
    unread = 0
    if chats:
        chats = json.loads(chats)
        for chat_id in chats:
            n = await get_unread_counter(chat_id.decode("utf-8"), author_id)
            unread += n
    return unread


@login_required
async def resolve_total_unread_counter(_, info):
    author_id = info.context["author_id"]

    return get_total_unread_counter(author_id)