from datetime import datetime

from dateutil.parser import parse as date_parse
from sqlalchemy.exc import IntegrityError
from transliterate import translit

from base.orm import local_session
from migration.extract import prepare_html_body
from orm.community import Community
from orm.reaction import Reaction, ReactionKind
from orm.shout import Shout, ShoutTopic, User
from orm.topic import TopicFollower
from services.stat.reacted import ReactedStorage
from services.stat.viewed import ViewedByDay
from services.zine.topics import TopicStorage

OLD_DATE = "2016-03-05 22:22:00.350000"
ts = datetime.now()
type2layout = {
    "Article": "article",
    "Literature": "prose",
    "Music": "music",
    "Video": "video",
    "Image": "image",
}


def get_shout_slug(entry):
    slug = entry.get("slug", "")
    if not slug:
        for friend in entry.get("friendlySlugs", []):
            slug = friend.get("slug", "")
            if slug:
                break
    return slug


async def migrate(entry, storage):
    # init, set title and layout
    r = {
        "layout": type2layout[entry["type"]],
        "title": entry["title"],
        "community": Community.default_community.id,
        "authors": [],
        "topics": set([]),
        # 'rating': 0,
        # 'ratings': [],
        "createdAt": [],
    }
    topics_by_oid = storage["topics"]["by_oid"]
    users_by_oid = storage["users"]["by_oid"]

    # author

    oid = entry.get("createdBy", entry.get("_id", entry.get("oid")))
    userdata = users_by_oid.get(oid)
    if not userdata:
        app = entry.get("application")
        if app:
            userslug = (
                translit(app["name"], "ru", reversed=True)
                .replace(" ", "-")
                .replace("'", "")
                .replace(".", "-")
                .lower()
            )
            userdata = {
                "username": app["email"],
                "email": app["email"],
                "name": app["name"],
                "bio": app.get("bio", ""),
                "emailConfirmed": False,
                "slug": userslug,
                "createdAt": ts,
                "wasOnlineAt": ts,
            }
        else:
            userdata = User.default_user.dict()
    if not userdata:
        raise Exception(
            "no user found for %s from %d" % [oid, len(users_by_oid.keys())]
        )
    r["authors"] = [
        userdata,
    ]

    # slug

    slug = get_shout_slug(entry)
    if slug:
        r["slug"] = slug
    else:
        raise Exception

    # cover
    c = ""
    if entry.get("thumborId"):
        c = "https://assets.discours.io/unsafe/1600x/" + entry["thumborId"]
    else:
        c = entry.get("image", {}).get("url")
        if not c or "cloudinary" in c:
            c = ""
    r["cover"] = c

    # timestamps

    r["createdAt"] = date_parse(entry.get("createdAt", OLD_DATE))
    r["updatedAt"] = date_parse(entry["updatedAt"]) if "updatedAt" in entry else ts
    if entry.get("published"):
        r["publishedAt"] = date_parse(entry.get("publishedAt", OLD_DATE))
    if "deletedAt" in entry:
        r["deletedAt"] = date_parse(entry["deletedAt"])

    # topics
    category = entry["category"]
    mainTopic = topics_by_oid.get(category)
    if mainTopic:
        r["mainTopic"] = storage["replacements"].get(
            mainTopic["slug"], mainTopic["slug"]
        )
    topic_oids = [
        category,
    ]
    topic_oids.extend(entry.get("tags", []))
    for oid in topic_oids:
        if oid in storage["topics"]["by_oid"]:
            r["topics"].add(storage["topics"]["by_oid"][oid]["slug"])
        else:
            print("[migration] unknown old topic id: " + oid)
    r["topics"] = list(r["topics"])

    entry["topics"] = r["topics"]
    entry["cover"] = r["cover"]
    entry["authors"] = r["authors"]

    # body
    r["body"] = prepare_html_body(entry)

    # save shout to db

    s = object()
    shout_dict = r.copy()
    user = None
    del shout_dict["topics"]
    # NOTE: AttributeError: 'str' object has no attribute '_sa_instance_state'
    # del shout_dict['rating'] # NOTE: TypeError: 'rating' is an invalid keyword argument for Shout
    # del shout_dict['ratings']
    email = userdata.get("email")
    userslug = userdata.get("slug")
    if not userslug:
        raise Exception
    with local_session() as session:
        # c = session.query(Community).all().pop()
        if email:
            user = session.query(User).filter(User.email == email).first()
        if not user and userslug:
            user = session.query(User).filter(User.slug == userslug).first()
        if not user and userdata:
            try:
                userdata["slug"] = userdata["slug"].lower().strip().replace(" ", "-")
                user = User.create(**userdata)
            except IntegrityError:
                print("[migration] user error: " + userdata)
            userdata["id"] = user.id
            userdata["createdAt"] = user.createdAt
            storage["users"]["by_slug"][userdata["slug"]] = userdata
            storage["users"]["by_oid"][entry["_id"]] = userdata
    if not user:
        raise Exception("could not get a user")
    shout_dict["authors"] = [
        user,
    ]

    # TODO: subscribe shout user on shout topics
    try:
        s = Shout.create(**shout_dict)
        with local_session() as session:
            topics = session.query(ShoutTopic).where(ShoutTopic.shout == s.slug).all()
            for tpc in topics:
                TopicFollower.create(topic=tpc.slug, follower=userslug)
                await TopicStorage.update_topic(tpc.slug)
    except IntegrityError as e:
        with local_session() as session:
            s = session.query(Shout).filter(Shout.slug == shout_dict["slug"]).first()
            bump = False
            if s:
                for key in shout_dict:
                    if key in s.__dict__:
                        if s.__dict__[key] != shout_dict[key]:
                            print(
                                "[migration] shout already exists, but differs in %s"
                                % key
                            )
                            bump = True
                    else:
                        print("[migration] shout already exists, but lacks %s" % key)
                        bump = True
                if bump:
                    s.update(shout_dict)
            else:
                print("[migration] something went wrong with shout: \n%r" % shout_dict)
                raise e
            session.commit()
    except Exception as e:
        print(e)
        print(s)
        raise Exception

    # shout topics aftermath
    shout_dict["topics"] = []
    for tpc in r["topics"]:
        oldslug = tpc
        newslug = storage["replacements"].get(oldslug, oldslug)
        if newslug:
            with local_session() as session:
                shout_topic_old = (
                    session.query(ShoutTopic)
                    .filter(ShoutTopic.shout == shout_dict["slug"])
                    .filter(ShoutTopic.topic == oldslug)
                    .first()
                )
                if shout_topic_old:
                    shout_topic_old.update({"slug": newslug})
                else:
                    shout_topic_new = (
                        session.query(ShoutTopic)
                        .filter(ShoutTopic.shout == shout_dict["slug"])
                        .filter(ShoutTopic.topic == newslug)
                        .first()
                    )
                    if not shout_topic_new:
                        try:
                            ShoutTopic.create(
                                **{"shout": shout_dict["slug"], "topic": newslug}
                            )
                        except Exception:
                            print("[migration] shout topic error: " + newslug)
                session.commit()
            if newslug not in shout_dict["topics"]:
                shout_dict["topics"].append(newslug)
        else:
            print("[migration] ignored topic slug: \n%r" % tpc["slug"])
            # raise Exception

    # content_item ratings to reactions
    try:
        for content_rating in entry.get("ratings", []):
            with local_session() as session:
                rater = (
                    session.query(User)
                    .filter(User.oid == content_rating["createdBy"])
                    .first()
                )
                reactedBy = (
                    rater
                    if rater
                    else session.query(User).filter(User.slug == "noname").first()
                )
                if rater:
                    reaction_dict = {
                        "kind": ReactionKind.LIKE
                        if content_rating["value"] > 0
                        else ReactionKind.DISLIKE,
                        "createdBy": reactedBy.slug,
                        "shout": shout_dict["slug"],
                    }
                    cts = content_rating.get("createdAt")
                    if cts:
                        reaction_dict["createdAt"] = date_parse(cts)
                    reaction = (
                        session.query(Reaction)
                        .filter(Reaction.shout == reaction_dict["shout"])
                        .filter(Reaction.createdBy == reaction_dict["createdBy"])
                        .filter(Reaction.kind == reaction_dict["kind"])
                        .first()
                    )
                    if reaction:
                        reaction_dict["kind"] = (
                            ReactionKind.AGREE
                            if content_rating["value"] > 0
                            else ReactionKind.DISAGREE,
                        )
                        reaction.update(reaction_dict)
                    else:
                        # day = (
                        #     reaction_dict.get("createdAt") or ts
                        # ).replace(hour=0, minute=0, second=0, microsecond=0)
                        rea = Reaction.create(**reaction_dict)
                        await ReactedStorage.react(rea)
                    # shout_dict['ratings'].append(reaction_dict)
    except Exception:
        raise Exception("[migration] content_item.ratings error: \n%r" % content_rating)

    # shout views
    ViewedByDay.create(shout=shout_dict["slug"], value=entry.get("views", 1))
    # del shout_dict['ratings']
    shout_dict["oid"] = entry.get("_id")
    storage["shouts"]["by_oid"][entry["_id"]] = shout_dict
    storage["shouts"]["by_slug"][slug] = shout_dict
    return shout_dict