from abc import abstractmethod

from core import db
from core.models import MusicFolder, Track, Tag, TrackTag, SessionTrack, Session


class Repository:
    MODEL_CLS = None

    def __init__(self):
        self.session = db.session()

    def query(self):
        return self.session.query(self.MODEL_CLS)

    def commit(self):
        self.session.commit()

    def rollback(self):
        self.session.rollback()

    def get_by_id(self, id_):
        return self.query().filter(id == id_).first()

    def get_all(self):
        return self.query().all()

    def get_by(self, field, val):
        return self.query().filter(field == val).all()

    def exists(self, field, val):
        return self.query().filter(field == val).exists()

    def create(self, model, commit=False):
        self.session.add(model)
        if commit:
            self.session.commit()

    def delete(self, model, commit=False):
        model.delete()
        if commit:
            self.commit()

    def __del__(self):
        self.session.close()


class MusicFolderRepository(Repository):
    MODEL_CLS = MusicFolder

    def __init__(self):
        super().__init__()


class TagRepository(Repository):
    MODEL_CLS = Tag

    def __init__(self):
        super().__init__()

    def get_by_track_id(self, track_id):
        return self.session.query(Tag)\
            .join(TrackTag, Tag.id == TrackTag.tag_id)\
            .filter(TrackTag.track_id == track_id).\
            all()


class TrackRepository(Repository):
    MODEL_CLS = Track

    def get_by_tag_id(self, tag_id):
        return self.session.query(Track)\
            .join(TrackTag, Track.id == TrackTag.track_id)\
            .filter(TrackTag.tag_id == tag_id).\
            all()

    def get_by_tag_ids(self, tag_ids):
        return self.session.query(Track)\
            .join(TrackTag, Track.id == TrackTag.track_id)\
            .filter(TrackTag.tag_id.in_(tag_ids)).\
            all()

    def get_by_session_id(self, session_id):
        return self.session.query(Track)\
            .join(SessionTrack, Track.id == SessionTrack.track_id)\
            .filter(SessionTrack.session_id == session_id).\
            all()


class SessionRepository(Repository):
    TABLE_NAME = "Sessions"
    MODEL_CLS = Track

    def __init__(self):
        super().__init__()

    def get_by_track_id(self, track_id):
        return self.session.query(Session)\
            .join(SessionTrack, Track.id == SessionTrack.track_id)\
            .filter(SessionTrack.track_id == track_id).\
            all()