import asyncio
from base.orm import local_session
from services.stat.reacted import ReactedStorage
from services.stat.viewed import ViewedStorage
from services.zine.shoutauthor import ShoutAuthorStorage
from orm.topic import ShoutTopic, TopicFollower


class TopicStat:
    shouts_by_topic = {}
    authors_by_topic = {}
    followers_by_topic = {}
    lock = asyncio.Lock()
    period = 30 * 60  # sec

    @staticmethod
    async def load_stat(session):
        self = TopicStat
        self.shouts_by_topic = {}
        self.authors_by_topic = {}
        shout_topics = session.query(ShoutTopic).all()
        for shout_topic in shout_topics:
            topic = shout_topic.topic
            shout = shout_topic.shout
            if not self.shouts_by_topic.get(topic):
                self.shouts_by_topic[topic] = []
            if shout not in self.shouts_by_topic[topic]:
                self.shouts_by_topic[topic].append(shout)

            authors = await ShoutAuthorStorage.get_authors(shout)
            if topic in self.authors_by_topic:
                self.authors_by_topic[topic].update(authors)
            else:
                self.authors_by_topic[topic] = list(set(authors))

        print("[stat.topics] authors sorted")
        print("[stat.topics] shouts sorted")

        self.followers_by_topic = {}
        followings = session.query(TopicFollower)
        for flw in followings:
            topic = flw.topic
            user = flw.follower
            if topic in self.followers_by_topic:
                self.followers_by_topic[topic].append(user)
            else:
                self.followers_by_topic[topic] = [user, ]
        print("[stat.topics] followers sorted")

    @staticmethod
    async def get_shouts(topic):
        self = TopicStat
        async with self.lock:
            return self.shouts_by_topic.get(topic, [])

    @staticmethod
    async def get_stat(topic):
        self = TopicStat
        async with self.lock:
            shouts = self.shouts_by_topic.get(topic, [])
            followers = self.followers_by_topic.get(topic, [])
            authors = self.authors_by_topic.get(topic, [])

        return {
            "shouts": len(shouts),
            "authors": len(authors),
            "followers": len(followers),
            "viewed": await ViewedStorage.get_topic(topic),
            "reacted": len(await ReactedStorage.get_topic(topic)),
            "commented": len(await ReactedStorage.get_topic_comments(topic)),
            "rating": await ReactedStorage.get_topic_rating(topic),
        }

    @staticmethod
    async def worker():
        self = TopicStat
        while True:
            try:
                with local_session() as session:
                    async with self.lock:
                        await self.load_stat(session)
                        print("[stat.topics] periodical update")
            except Exception as err:
                print("[stat.topics] errror: %s" % (err))
            await asyncio.sleep(self.period)