from sqlalchemy import desc
from orm.reaction import Reaction
from base.orm import local_session
from orm.shout import ShoutReactionsFollower
from orm.user import User
from base.resolvers import mutation, query
from auth.authenticate import login_required
from datetime import datetime
from services.auth.users import UserStorage
from services.stat.reacted import ReactedStorage


def reactions_follow(user, slug, auto=False):
    with local_session() as session:
        fw = (
            session.query(ShoutReactionsFollower)
            .filter(
                ShoutReactionsFollower.follower == user.slug,
                ShoutReactionsFollower.shout == slug,
            )
            .first()
        )
        if auto and fw:
            return
        elif not auto and fw:
            if bool(fw.deletedAt):
                fw.deletedAt = None
                fw.auto = False
                session.commit()
                return
            # print("[resolvers.reactions] was followed before")

    ShoutReactionsFollower.create(follower=user.slug, shout=slug, auto=auto)


def reactions_unfollow(user, slug):
    with local_session() as session:
        following = (
            session.query(ShoutReactionsFollower)
            .filter(
                ShoutReactionsFollower.follower == user.slug,
                ShoutReactionsFollower.shout == slug,
            )
            .first()
        )
        if not following:
            # print("[resolvers.reactions] was not followed", slug)
            return
        if following.auto:
            following.deletedAt = datetime.now()
        else:
            session.delete(following)
        session.commit()


@mutation.field("createReaction")
@login_required
async def create_reaction(_, info, inp):
    user = info.context["request"].user

    # TODO: filter allowed reaction kinds

    reaction = Reaction.create(**inp)
    ReactedStorage.increment(reaction.shout, reaction.replyTo)
    try:
        reactions_follow(user, inp["shout"], True)
    except Exception as e:
        print(f"[resolvers.reactions] error on reactions autofollowing: {e}")

    return {"reaction": reaction}


@mutation.field("updateReaction")
@login_required
async def update_reaction(_, info, inp):
    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()
        reaction = session.query(Reaction).filter(Reaction.id == id).first()
        if not reaction:
            return {"error": "invalid reaction id"}
        if reaction.createdBy != user.slug:
            return {"error": "access denied"}
        reaction.body = inp["body"]
        reaction.updatedAt = datetime.now()
        if reaction.kind != inp["kind"]:
            # NOTE: change mind detection can be here
            pass
        if inp.get("range"):
            reaction.range = inp.get("range")
        session.commit()

    return {"reaction": reaction}


@mutation.field("deleteReaction")
@login_required
async def delete_reaction(_, info, id):
    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()
        reaction = session.query(Reaction).filter(Reaction.id == id).first()
        if not reaction:
            return {"error": "invalid reaction id"}
        if reaction.createdBy != user.slug:
            return {"error": "access denied"}
        reaction.deletedAt = datetime.now()
        session.commit()
    return {}


@query.field("reactionsByShout")
async def get_shout_reactions(_, info, slug, page, size):
    offset = page * size
    reactions = []
    with local_session() as session:
        reactions = (
            session.query(Reaction)
            .filter(Reaction.shout == slug)
            .limit(size)
            .offset(offset)
            .all()
        )
    for r in reactions:
        r.createdBy = await UserStorage.get_user(r.createdBy or "discours")
    return reactions


@query.field("reactionsForShouts")
async def get_reactions_for_shouts(_, info, shoutslugs, page, size):
    offset = page * size
    reactions = []
    with local_session() as session:
        for slug in shoutslugs:
            reactions += (
                session.query(Reaction)
                .filter(Reaction.shout == slug)
                .where(not bool(Reaction.deletedAt))
                .order_by(desc("createdAt"))
                .offset(offset)
                .limit(size)
                .all()
            )
    for r in reactions:
        r.createdBy = await UserStorage.get_user(r.createdBy or "discours")
    return reactions


@query.field("reactionsByAuthor")
async def get_reactions_by_author(_, info, slug, page=1, size=50):
    offset = page * size
    reactions = []
    with local_session() as session:
        reactions = (
            session.query(Reaction)
            .filter(Reaction.createdBy == slug)
            .limit(size)
            .offset(offset)
        )
    for r in reactions:
        r.createdBy = await UserStorage.get_user(r.createdBy or "discours")
    return reactions