from datetime import datetime
from typing import List

from sqlalchemy import and_

from auth.authenticate import login_required
from base.orm import local_session
from base.resolvers import mutation, query
from orm.community import Community, CommunityFollower
from orm.user import User


@mutation.field("createCommunity")
@login_required
async def create_community(_, info, input):
    auth = info.context["request"].auth
    user_id = auth.user_id
    with local_session() as session:
        user = session.query(User).where(User.id == user_id).first()
        community = Community.create(
            slug=input.get("slug", ""),
            title=input.get("title", ""),
            desc=input.get("desc", ""),
            pic=input.get("pic", ""),
            createdBy=user.slug,
            createdAt=datetime.now(),
        )
        session.add(community)
        session.commit()

    return {"community": community}


@mutation.field("updateCommunity")
@login_required
async def update_community(_, info, input):
    auth = info.context["request"].auth
    user_id = auth.user_id
    community_slug = input.get("slug", "")

    with local_session() as session:
        owner = session.query(User).filter(User.id == user_id)  # note list here
        community = (
            session.query(Community).filter(Community.slug == community_slug).first()
        )
        editors = [e.slug for e in community.editors]
        if not community:
            return {"error": "invalid community id"}
        if community.createdBy not in (owner + editors):
            return {"error": "access denied"}
        community.title = input.get("title", "")
        community.desc = input.get("desc", "")
        community.pic = input.get("pic", "")
        community.updatedAt = datetime.now()
        session.add(community)
        session.commit()


@mutation.field("deleteCommunity")
@login_required
async def delete_community(_, info, slug):
    auth = info.context["request"].auth
    user_id = auth.user_id

    with local_session() as session:
        community = session.query(Community).filter(Community.slug == slug).first()
        if not community:
            return {"error": "invalid community slug"}
        if community.owner != user_id:
            return {"error": "access denied"}
        community.deletedAt = datetime.now()
        session.add(community)
        session.commit()

    return {}


@query.field("getCommunity")
async def get_community(_, info, slug):
    with local_session() as session:
        community = session.query(Community).filter(Community.slug == slug).first()
        if not community:
            return {"error": "invalid community id"}

    return community


@query.field("getCommunities")
async def get_communities(_, info):
    with local_session() as session:
        communities = session.query(Community)
    return communities


def community_follow(user, slug):
    CommunityFollower.create(follower=user.slug, community=slug)


def community_unfollow(user, slug):
    with local_session() as session:
        following = (
            session.query(CommunityFollower)
            .filter(
                and_(
                    CommunityFollower.follower == user.slug,
                    CommunityFollower.community == slug,
                )
            )
            .first()
        )
        if not following:
            raise Exception("[orm.community] following was not exist")
        session.delete(following)
        session.commit()


@query.field("userFollowedCommunities")
def get_followed_communities(_, user_slug) -> List[Community]:
    ccc = []
    with local_session() as session:
        ccc = (
            session.query(Community.slug)
            .join(CommunityFollower)
            .where(CommunityFollower.follower == user_slug)
            .all()
        )
    return ccc