from typing import List

from sqlalchemy import select

from orm.community import Community, CommunityAuthor as CommunityFollower
from orm.reaction import Reaction
from orm.shout import Shout
from orm.topic import Topic, TopicFollower
from services.auth import login_required
from resolvers.author import author_follow, author_unfollow
from resolvers.reaction import reactions_follow, reactions_unfollow
from resolvers.topic import topic_follow, topic_unfollow
from resolvers.community import community_follow, community_unfollow
from services.following import FollowingManager, FollowingResult
from services.db import local_session
from orm.author import Author, AuthorFollower
from services.notify import notify_follower
from services.schema import mutation, query


@login_required
@mutation.field("follow")
async def follow(_, info, what, slug):
    user_id = info.context["user_id"]
    try:
        with local_session() as session:
            actor = session.query(Author).filter(Author.user == user_id).first()
            if actor:
                follower_id = actor.id
                if what == "AUTHOR":
                    if author_follow(follower_id, slug):
                        result = FollowingResult("NEW", "author", slug)
                        await FollowingManager.push("author", result)
                        author = session.query(Author.id).where(Author.slug == slug).one()
                        follower = session.query(Author).where(Author.id == follower_id).one()
                        await notify_follower(follower.dict(), author.id)
                elif what == "TOPIC":
                    if topic_follow(follower_id, slug):
                        result = FollowingResult("NEW", "topic", slug)
                        await FollowingManager.push("topic", result)
                elif what == "COMMUNITY":
                    if community_follow(follower_id, slug):
                        result = FollowingResult("NEW", "community", slug)
                        await FollowingManager.push("community", result)
                elif what == "REACTIONS":
                    if reactions_follow(follower_id, slug):
                        result = FollowingResult("NEW", "shout", slug)
                        await FollowingManager.push("shout", result)
    except Exception as e:
        print(Exception(e))
        return {"error": str(e)}

    return {}


@login_required
@mutation.field("unfollow")
async def unfollow(_, info, what, slug):
    user_id = info.context["user_id"]
    try:
        with local_session() as session:
            actor = session.query(Author).filter(Author.user == user_id).first()
            if actor:
                follower_id = actor.id
                if what == "AUTHOR":
                    if author_unfollow(follower_id, slug):
                        result = FollowingResult("DELETED", "author", slug)
                        await FollowingManager.push("author", result)
                        author = session.query(Author.id).where(Author.slug == slug).one()
                        follower = session.query(Author).where(Author.id == follower_id).one()
                        await notify_follower(follower.dict(), author.id, "unfollow")
                elif what == "TOPIC":
                    if topic_unfollow(follower_id, slug):
                        result = FollowingResult("DELETED", "topic", slug)
                        await FollowingManager.push("topic", result)
                elif what == "COMMUNITY":
                    if community_unfollow(follower_id, slug):
                        result = FollowingResult("DELETED", "community", slug)
                        await FollowingManager.push("community", result)
                elif what == "REACTIONS":
                    if reactions_unfollow(follower_id, slug):
                        result = FollowingResult("DELETED", "shout", slug)
                        await FollowingManager.push("shout", result)
    except Exception as e:
        return {"error": str(e)}

    return {}


@query.field("get_my_followed")
@login_required
async def get_my_followed(_, info):
    user_id = info.context["user_id"]
    with local_session() as session:
        author = session.query(Author).filter(Author.user == user_id).first()
        if author:
            authors_query = (
                select(Author)
                .join(AuthorFollower, AuthorFollower.author == Author.id)
                .where(AuthorFollower.follower == author.id)
            )

            topics_query = select(Topic).join(TopicFollower).where(TopicFollower.follower == author.id)
            communities_query = (
                select(Community)
                .join(CommunityFollower, CommunityFollower.author == Author.id)
                .where(CommunityFollower.follower == author.id)
            )
            topics = []
            authors = []
            communities = []
            for [author] in session.execute(authors_query):
                authors.append(author)

            for [topic] in session.execute(topics_query):
                topics.append(topic)

            for [c] in session.execute(communities_query):
                communities.append(c)
            return {"topics": topics, "authors": authors, "communities": communities}


@query.field("get_shout_followers")
def get_shout_followers(_, _info, slug: str = "", shout_id: int = None) -> List[Author]:
    followers = []
    with local_session() as session:
        shout = None
        if slug:
            shout = session.query(Shout).filter(Shout.slug == slug).first()
        elif shout_id:
            shout = session.query(Shout).filter(Shout.id == shout_id).first()
        if shout:
            reactions = session.query(Reaction).filter(Reaction.shout == shout.id).all()
            for r in reactions:
                followers.append(r.created_by)

            return followers