import json

from auth.authenticate import login_required
from auth.credentials import AuthCredentials
from base.orm import local_session
from base.redis import redis
from base.resolvers import query
from orm.user import User
from resolvers.zine.profile import followed_authors

from .unread import get_unread_counter

# from datetime import datetime, timedelta, timezone


async def load_messages(chat_id: str, limit: int = 5, offset: int = 0, ids=[]):
    '''load :limit messages for :chat_id with :offset'''
    messages = []
    message_ids = []
    if ids:
        message_ids += ids
    try:
        if limit:
            mids = await redis.lrange(f"chats/{chat_id}/message_ids", offset, offset + limit)
            mids = [mid.decode("utf-8") for mid in mids]
            message_ids += mids
    except Exception as e:
        print(e)
    if message_ids:
        message_keys = [f"chats/{chat_id}/messages/{mid}" for mid in message_ids]
        messages = await redis.mget(*message_keys)
        messages = [json.loads(msg.decode('utf-8')) for msg in messages]
        replies = []
        for m in messages:
            rt = m.get('replyTo')
            if rt:
                rt = int(rt)
                if rt not in message_ids:
                    replies.append(rt)
        if replies:
            messages += await load_messages(chat_id, limit=0, ids=replies)
    return messages


@query.field("loadChats")
@login_required
async def load_chats(_, info, limit: int = 50, offset: int = 0):
    """load :limit chats of current user with :offset"""
    auth: AuthCredentials = info.context["request"].auth

    cids = await redis.execute("SMEMBERS", "chats_by_user/" + str(auth.user_id))
    if cids:
        cids = list(cids)[offset : offset + limit]
    if not cids:
        print('[inbox.load] no chats were found')
        cids = []
    onliners = await redis.execute("SMEMBERS", "users-online")
    if not onliners:
        onliners = []
    chats = []
    for cid in cids:
        cid = cid.decode("utf-8")
        c = await redis.execute("GET", "chats/" + cid)
        if c:
            c = dict(json.loads(c))
            c['messages'] = await load_messages(cid, 5, 0)
            c['unread'] = await get_unread_counter(cid, auth.user_id)
            with local_session() as session:
                c['members'] = []
                for uid in c["users"]:
                    a = session.query(User).where(User.id == uid).first()
                    if a:
                        c['members'].append(
                            {
                                "id": a.id,
                                "slug": a.slug,
                                "userpic": a.userpic,
                                "name": a.name,
                                "lastSeen": a.lastSeen,
                                "online": a.id in onliners,
                            }
                        )
                chats.append(c)
    return {"chats": chats, "error": None}


@query.field("loadMessagesBy")
@login_required
async def load_messages_by(_, info, by, limit: int = 10, offset: int = 0):
    '''load :limit messages of :chat_id with :offset'''

    auth: AuthCredentials = info.context["request"].auth
    userchats = await redis.execute("SMEMBERS", "chats_by_user/" + str(auth.user_id))
    userchats = [c.decode('utf-8') for c in userchats]
    # print('[inbox] userchats: %r' % userchats)
    if userchats:
        # print('[inbox] loading messages by...')
        messages = []
        by_chat = by.get('chat')
        if by_chat in userchats:
            chat = await redis.execute("GET", f"chats/{by_chat}")
            # print(chat)
            if not chat:
                return {"messages": [], "error": "chat not exist"}
            # everyone's messages in filtered chat
            messages = await load_messages(by_chat, limit, offset)
        return {"messages": sorted(list(messages), key=lambda m: m['createdAt']), "error": None}
    else:
        return {"error": "Cannot access messages of this chat"}


@query.field("loadRecipients")
async def load_recipients(_, info, limit=50, offset=0):
    chat_users = []
    auth: AuthCredentials = info.context["request"].auth
    onliners = await redis.execute("SMEMBERS", "users-online")
    if not onliners:
        onliners = []
    try:
        chat_users += await followed_authors(auth.user_id)
        limit = limit - len(chat_users)
    except Exception:
        pass
    with local_session() as session:
        chat_users += session.query(User).where(User.emailConfirmed).limit(limit).offset(offset)
        members = []
        for a in chat_users:
            members.append(
                {
                    "id": a.id,
                    "slug": a.slug,
                    "userpic": a.userpic,
                    "name": a.name,
                    "lastSeen": a.lastSeen,
                    "online": a.id in onliners,
                }
            )
    return {"members": members, "error": None}