from typing import List

from sqlalchemy import and_, desc, func
from sqlalchemy.orm import selectinload

from auth.authenticate import login_required
from base.orm import local_session
from base.resolvers import mutation, query
from orm.reaction import Reaction
from orm.shout import Shout
from orm.topic import Topic, TopicFollower
from orm.user import User, UserRole, Role, UserRating, AuthorFollower
from .community import get_followed_communities
from .inbox import get_unread_counter
from .reactions import get_reactions_for_shouts
from .topics import get_topic_stat
from services.auth.users import UserStorage
from services.zine.shoutauthor import ShoutAuthorStorage


async def get_user_subscriptions(slug):
    return {
        "unread": await get_unread_counter(slug),       # unread inbox messages counter
        "topics": [t.slug for t in await get_followed_topics(0, slug)],  # followed topics slugs
        "authors": [a.slug for a in await get_followed_authors(0, slug)],  # followed authors slugs
        "reactions": [r.shout for r in await get_reactions_for_shouts(0, [slug, ])],  # followed reacted shout
        "communities": [c.slug for c in get_followed_communities(0, slug)],  # followed communities slugs
    }


async def get_author_stat(slug):
    # TODO: implement author stat
    with local_session() as session:
        return {
            "followers": session.query(AuthorFollower).where(AuthorFollower.author == slug).count(),
            "rating": session.query(func.sum(UserRating.value)).where(UserRating.user == slug).first()
            # TODO: debug
        }


@query.field("userReactedShouts")
async def get_user_reacted_shouts(_, slug, offset, limit) -> List[Shout]:
    user = await UserStorage.get_user_by_slug(slug)
    if not user:
        return []
    with local_session() as session:
        shouts = (
            session.query(Shout)
            .join(Reaction)
            .where(Reaction.createdBy == user.slug)
            .order_by(desc(Reaction.createdAt))
            .limit(limit)
            .offset()
            .all()
        )
    return shouts


@query.field("userFollowedTopics")
@login_required
async def get_followed_topics(_, info, slug) -> List[Topic]:
    topics = []
    with local_session() as session:
        topics = (
            session.query(Topic)
            .join(TopicFollower)
            .where(TopicFollower.follower == slug)
            .all()
        )
        for topic in topics:
            topic.stat = await get_topic_stat(topic.slug)
    return topics


@query.field("userFollowedAuthors")
async def get_followed_authors(_, _info, slug) -> List[User]:
    authors = []
    with local_session() as session:
        authors = (
            session.query(User)
            .join(AuthorFollower, User.slug == AuthorFollower.author)
            .where(AuthorFollower.follower == slug)
            .all()
        )
        for author in authors:
            author.stat = await get_author_stat(author.slug)
    return authors


@query.field("userFollowers")
async def user_followers(_, _info, slug) -> List[User]:
    with local_session() as session:
        users = (
            session.query(User)
            .join(AuthorFollower, User.slug == AuthorFollower.follower)
            .where(AuthorFollower.author == slug)
            .all()
        )
    return users


@query.field("getUsersBySlugs")
async def get_users_by_slugs(_, _info, slugs):
    with local_session() as session:
        users = (
            session.query(User)
            .options(selectinload(User.ratings))
            .filter(User.slug in slugs)
            .all()
        )
    return users


@query.field("getUserRoles")
async def get_user_roles(_, _info, slug):
    with local_session() as session:
        user = session.query(User).where(User.slug == slug).first()
        roles = (
            session.query(Role)
            .options(selectinload(Role.permissions))
            .join(UserRole)
            .where(UserRole.user_id == user.id)
            .all()
        )
    return roles


@mutation.field("updateProfile")
@login_required
async def update_profile(_, info, profile):
    auth = info.context["request"].auth
    user_id = auth.user_id
    with local_session() as session:
        user = session.query(User).filter(User.id == user_id).first()
        if user:
            User.update(user, **profile)
            session.add(user)
            session.commit()
    return {}


@mutation.field("rateUser")
@login_required
async def rate_user(_, info, rated_userslug, value):
    user = info.context["request"].user
    with local_session() as session:
        rating = (
            session.query(UserRating)
            .filter(and_(UserRating.rater == user.slug, UserRating.user == rated_userslug))
            .first()
        )
        if rating:
            rating.value = value
            session.commit()
            return {}
    try:
        UserRating.create(rater=user.slug, user=rated_userslug, value=value)
    except Exception as err:
        return {"error": err}
    return {}


# for mutation.field("follow")
def author_follow(user, slug):
    with local_session() as session:
        af = AuthorFollower.create(follower=user.slug, author=slug)
        session.add(af)
        session.commit()


# for mutation.field("unfollow")
def author_unfollow(user, slug):
    with local_session() as session:
        flw = (
            session.query(AuthorFollower)
            .filter(
                and_(
                    AuthorFollower.follower == user.slug, AuthorFollower.author == slug
                )
            )
            .first()
        )
        if not flw:
            raise Exception("[resolvers.profile] follower not exist, cant unfollow")
        else:
            session.delete(flw)
            session.commit()


@query.field("authorsAll")
async def get_authors_all(_, _info):
    authors = await UserStorage.get_all_users()
    authorslugs = await ShoutAuthorStorage.get_authors()
    authors = filter(lambda a: a.emailConfirmed and a.slug in authorslugs, authors)
    for author in authors:
        author.stat = await get_author_stat(author.slug)
    return authors


@query.field("topAuthors")
def get_top_authors(_, _info, offset, limit):
    return list(UserStorage.get_top_users())[offset : offset + limit]  # type: ignore