import json
import time

from sqlalchemy import and_, desc, or_, select, text
from sqlalchemy.orm import aliased

from orm.author import Author, AuthorFollower
from orm.shout import ShoutAuthor, ShoutTopic
from orm.topic import Topic
from resolvers.stat import author_follows_authors, author_follows_topics, get_with_stat
from services.auth import login_required
from services.cache import cache_author
from services.db import local_session
from services.encoders import CustomJSONEncoder
from services.logger import root_logger as logger
from services.rediscache import redis
from services.schema import mutation, query


@mutation.field("update_author")
@login_required
async def update_author(_, info, profile):
    user_id = info.context.get("user_id")
    if not user_id:
        return {"error": "unauthorized", "author": None}
    try:
        with local_session() as session:
            author = session.query(Author).where(Author.user == user_id).first()
            if author:
                Author.update(author, profile)
                session.add(author)
                session.commit()
                author_query = select(Author).where(Author.user == user_id)
                [author] = get_with_stat(author_query)
                if author:
                    await cache_author(author.dict())
                return {"error": None, "author": author}
    except Exception as exc:
        import traceback

        logger.error(traceback.format_exc())
        return {"error": exc, "author": None}


@query.field("get_authors_all")
def get_authors_all(_, _info):
    with local_session() as session:
        authors = session.query(Author).all()
        return authors


@query.field("get_author")
async def get_author(_, _info, slug="", author_id=0):
    author_query = ""
    author = None
    author_dict = None
    try:
        # lookup for cached author
        author_query = select(Author)
        if slug:
            author_query = author_query.filter(Author.slug == slug)
        elif author_id:
            author_query = author_query.filter(Author.id == author_id)
        else:
            raise ValueError("Author not found")
        with local_session() as session:
            lookup_result = session.execute(author_query).first()
            if lookup_result:
                [found_author] = lookup_result
                # logger.debug(found_author)
                if found_author:
                    logger.debug(f"found author id: {found_author.id}")
                    author_id = found_author.id if found_author.id else author_id
                    if author_id:
                        cached_result = await redis.execute(
                            "GET", f"author:{author_id}"
                        )
                        if isinstance(cached_result, str):
                            author_dict = json.loads(cached_result)

            # update stat from db
            if not author_dict or not author_dict.get("stat"):
                result = get_with_stat(author_query)
                if not result:
                    raise ValueError("Author not found")
                [author] = result
                # use found author
                if isinstance(author, Author):
                    logger.debug(f"update @{author.slug} with id {author.id}")
                    author_dict = author.dict()
                    await cache_author(author_dict)
    except ValueError:
        pass
    except Exception as exc:
        import traceback

        logger.error(f"{exc}:\n{traceback.format_exc()}")
    return author_dict


async def get_author_by_user_id(user_id: str):
    logger.info(f"getting author id for {user_id}")
    redis_key = f"user:{user_id}"
    author = None
    try:
        res = await redis.execute("GET", redis_key)
        if isinstance(res, str):
            author = json.loads(res)
            author_id = author.get("id")
            author_slug = author.get("slug")
            if author_id:
                logger.debug(f"got author @{author_slug} #{author_id} cached")
                return author

        author_query = select(Author).filter(Author.user == user_id)
        result = get_with_stat(author_query)
        if result:
            [author] = result
            await cache_author(author.dict())
    except Exception as exc:
        import traceback

        traceback.print_exc()
        logger.error(exc)
    return author


@query.field("get_author_id")
async def get_author_id(_, _info, user: str):
    return await get_author_by_user_id(user)


@query.field("load_authors_by")
async def load_authors_by(_, _info, by, limit, offset):
    logger.debug(f"loading authors by {by}")
    authors_query = select(Author)
    if by.get("slug"):
        authors_query = authors_query.filter(Author.slug.ilike(f"%{by['slug']}%"))
    elif by.get("name"):
        authors_query = authors_query.filter(Author.name.ilike(f"%{by['name']}%"))
    elif by.get("topic"):
        authors_query = (
            authors_query.join(ShoutAuthor)
            .join(ShoutTopic)
            .join(Topic)
            .where(Topic.slug == str(by["topic"]))
        )

    if by.get("last_seen"):  # in unix time
        before = int(time.time()) - by["last_seen"]
        authors_query = authors_query.filter(Author.last_seen > before)
    elif by.get("created_at"):  # in unix time
        before = int(time.time()) - by["created_at"]
        authors_query = authors_query.filter(Author.created_at > before)
    authors_query = authors_query.limit(limit).offset(offset)
    with local_session() as session:
        authors_nostat = session.execute(authors_query)
        authors = []
        if authors_nostat:
            for [a] in authors_nostat:
                author_dict = None
                if isinstance(a, Author):
                    author_id = a.id
                    if bool(author_id):
                        cached_result = await redis.execute(
                            "GET", f"author:{author_id}"
                        )
                        if isinstance(cached_result, str):
                            author_dict = json.loads(cached_result)
                    if not author_dict or not isinstance(
                        author_dict.get("shouts"), int
                    ):
                        break

    # order
    order = by.get("order")
    if order in ["shouts", "followers"]:
        authors_query = authors_query.order_by(desc(text(f"{order}_stat")))
    # group by
    authors = get_with_stat(authors_query)
    return authors or []


@query.field("get_author_follows")
async def get_author_follows(_, _info, slug="", user=None, author_id=0):
    try:
        author_query = select(Author)
        if user:
            author_query = author_query.filter(Author.user == user)
        elif slug:
            author_query = author_query.filter(Author.slug == slug)
        elif author_id:
            author_query = author_query.filter(Author.id == author_id)
        else:
            return {"error": "One of slug, user, or author_id must be provided"}
        with local_session() as session:
            result = session.execute(author_query)
            if result:
                # logger.debug(result)
                [author] = result
                # logger.debug(author)
                if author and isinstance(author, Author):
                    # logger.debug(author.dict())
                    author_id = author.id if not author_id else author_id
                    topics = []
                    authors = []
                    if bool(author_id):
                        rkey = f"author:{author_id}:follows-authors"
                        logger.debug(f"getting {author_id} follows authors")
                        cached = await redis.execute("GET", rkey)
                        if not cached:
                            authors = author_follows_authors(author_id)  # type: ignore
                            prepared = [author.dict() for author in authors]
                            await redis.execute(
                                "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
                            )
                        elif isinstance(cached, str):
                            authors = json.loads(cached)

                        rkey = f"author:{author_id}:follows-topics"
                        cached = await redis.execute("GET", rkey)
                        if cached and isinstance(cached, str):
                            topics = json.loads(cached)
                        if not cached:
                            topics = author_follows_topics(author_id)  # type: ignore
                            prepared = [topic.dict() for topic in topics]
                            await redis.execute(
                                "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
                            )
                    return {
                        "topics": topics,
                        "authors": authors,
                        "communities": [
                            {"id": 1, "name": "Дискурс", "slug": "discours", "pic": ""}
                        ],
                    }
    except Exception:
        import traceback

        traceback.print_exc()
    return {"error": "Author not found"}


@query.field("get_author_follows_topics")
async def get_author_follows_topics(_, _info, slug="", user=None, author_id=None):
    with local_session() as session:
        if user or slug:
            author_id_result = (
                session.query(Author.id)
                .filter(or_(Author.user == user, Author.slug == slug))
                .first()
            )
            author_id = author_id_result[0] if author_id_result else None
        if not author_id:
            raise ValueError("Author not found")
        logger.debug(f"getting {author_id} follows topics")
        rkey = f"author:{author_id}:follows-topics"
        cached = await redis.execute("GET", rkey)
        topics = []
        if isinstance(cached, str):
            topics = json.loads(cached)
        if not cached:
            topics = author_follows_topics(author_id)
            prepared = [topic.dict() for topic in topics]
            await redis.execute(
                "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
            )
        return topics


@query.field("get_author_follows_authors")
async def get_author_follows_authors(_, _info, slug="", user=None, author_id=None):
    with local_session() as session:
        if user or slug:
            author_id_result = (
                session.query(Author.id)
                .filter(or_(Author.user == user, Author.slug == slug))
                .first()
            )
            author_id = author_id_result[0] if author_id_result else None
        if author_id:
            logger.debug(f"getting {author_id} follows authors")
            rkey = f"author:{author_id}:follows-authors"
            cached = await redis.execute("GET", rkey)
            authors = []
            if isinstance(cached, str):
                authors = json.loads(cached)
            if not authors:
                authors = author_follows_authors(author_id)
                prepared = [author.dict() for author in authors]
                await redis.execute(
                    "SET", rkey, json.dumps(prepared, cls=CustomJSONEncoder)
                )
            return authors
        else:
            raise ValueError("Author not found")


def create_author(user_id: str, slug: str, name: str = ""):
    with local_session() as session:
        try:
            author = None
            if user_id:
                author = session.query(Author).filter(Author.user == user_id).first()
            elif slug:
                author = session.query(Author).filter(Author.slug == slug).first()
            if not author:
                new_author = Author(user=user_id, slug=slug, name=name)
                session.add(new_author)
                session.commit()
                logger.info(f"author created by webhook {new_author.dict()}")
        except Exception as exc:
            logger.debug(exc)


@query.field("get_author_followers")
async def get_author_followers(_, _info, slug: str):
    logger.debug(f"getting followers for @{slug}")
    try:
        author_alias = aliased(Author)
        author_query = select(author_alias).filter_by(slug=slug)
        with local_session() as session:
            result = session.execute(author_query).first()
            if not result:
                return []

            author = result[0]
            author_id = author.id

            cached = await redis.execute("GET", f"author:{author_id}:followers")
            if cached:
                followers_cached = json.loads(cached)
                if isinstance(followers_cached, list):
                    logger.debug(
                        f"@{slug} got {len(followers_cached)} followers cached"
                    )
                    followers = [fc for fc in followers_cached if fc["id"] != author_id]
                    return followers

            author_follower_alias = aliased(AuthorFollower, name="af")
            followers_query = select(Author).join(
                author_follower_alias,
                and_(
                    author_follower_alias.author == author_id,
                    author_follower_alias.follower == Author.id,
                    Author.id != author_id,
                ),
            )
            followers_result = await session.execute(followers_query)
            followers = followers_result.scalars().all()

            if isinstance(followers, list):
                followers_data = [follower.dict() for follower in followers]
                await redis.execute(
                    "SET", f"author:{author_id}:followers", json.dumps(followers_data)
                )
                logger.debug(f"@{slug} cache updated with {len(followers)} followers")
            return followers
    except Exception as exc:
        import traceback

        logger.error(exc)
        logger.error(traceback.format_exc())
        return []