import json
import logging
import time
import uuid

from models.chat import Chat, ChatUpdate
from services.auth import login_required
from services.presence import notify_chat
from services.rediscache import redis
from services.schema import mutation


logger = logging.getLogger('[resolvers.chats] ')
logger.setLevel(logging.DEBUG)


@mutation.field('update_chat')
@login_required
async def update_chat(_, info, chat_new: ChatUpdate):
    """
    updating chat
    requires info.context["author_id"] to be in chat["admins"]
    :param _: not used
    :param info: GraphQLInfo with request
    :param chat_new: dict with chat data
    :return: Result { error chat }
    """
    logger.info('update_chat')
    author_id = info.context['author_id']
    chat_id = chat_new['id']
    chat_str = await redis.execute('GET', f'chats/{chat_id}')
    if not chat_str:
        return {'error': 'chat not exist'}
    elif isinstance(chat_str, str):
        chat: Chat = json.loads(chat_str)
        if author_id in chat['admins']:
            chat.update(
                {
                    'title': chat_new.get('title', chat['title']),
                    'description': chat_new.get('description', chat['description']),
                    'updated_at': int(time.time()),
                    'admins': chat_new.get('admins', chat.get('admins') or []),
                    'members': chat_new.get('members', chat['members']),
                }
            )

            await redis.execute('SET', f"chats/{chat['id']}", json.dumps(chat))
            for member_id in chat['members']:
                await notify_chat(chat, member_id, 'update')

        return {'error': None, 'chat': chat}


@mutation.field('create_chat')
@login_required
async def create_chat(_, info, title='', members=None):
    logger.info('create_chat')
    members = members or []
    author_id = info.context['author_id']
    chat: Chat
    if author_id:
        if author_id not in members:
            members.append(int(author_id))

        # NOTE: private chats has no title
        # reuse private chat created before if exists
        if len(members) == 2 and title == '':
            chatset1 = await redis.execute('SMEMBERS', f'chats_by_author/{members[0]}')
            chatset2 = await redis.execute('SMEMBERS', f'chats_by_author/{members[1]}')
            for c in chatset1.intersection(chatset2):
                chat = await redis.execute('GET', f'chats/{c}')
                if chat['title'] == '':
                    logger.info('[inbox] createChat found old chat')
                    return {'chat': chat, 'error': 'existed'}

        chat_id = str(uuid.uuid4())
        chat: Chat = {
            'id': chat_id,
            'members': members,
            'title': title,
            'description': '',
            'created_by': author_id,
            'created_at': int(time.time()),
            'updated_at': int(time.time()),
            'admins': members if (len(members) == 2 and title == '') else [],
        }

        for member_id in members:
            await redis.execute('SADD', f'chats_by_author/{member_id}', chat_id)
            await notify_chat(chat, member_id, 'create')

        print(f'\n\n[resolvers.chats] creating: {chat}\n\n')

        await redis.execute('SET', f'chats/{chat_id}', json.dumps(chat))
        await redis.execute('SET', f'chats/{chat_id}/next_message_id', str(0))

        return {'error': None, 'chat': chat}
    return {'error': 'no chat was created'}


@mutation.field('delete_chat')
@login_required
async def delete_chat(_, info, chat_id: str):
    logger.info('delete_chat')
    author_id = info.context['author_id']
    chat_str = await redis.execute('GET', f'chats/{chat_id}')
    if isinstance(chat_str, str):
        chat: Chat = json.loads(chat_str)
        if author_id in chat['admins']:
            await redis.execute('DEL', f'chats/{chat_id}')
            await redis.execute('SREM', f'chats_by_author/{author_id}', chat_id)
            for member_id in chat['members']:
                await notify_chat(chat, member_id, 'delete')
    return {'error': 'chat not exist'}