ArtNet-Webservice/database/database.py

from typing import List

import psycopg2
from sqlalchemy import Column, Boolean, Float, String, Integer, ForeignKey, Table, func, ForeignKeyConstraint
import sqlalchemy.orm as db
import sqlalchemy
from sqlalchemy.orm import declarative_base, relationship, load_only

from database.models import Art, ArtnoID, Artist, Presence, TagCategory, TagCategorynoID, TagNoID, Tag, \
    Topic, TopicNoId, Collection, CollectionNoID, Art2CollRelationNoID, Art2CollRelation

# TODO read sensitive data from environment file or similar
SQLALCHEMY_DATABASE_URL = "postgresql://artnet_editor:G606Rm9sFEXe6wfTLxVu@[::1]/test_artnet"
engine = sqlalchemy.create_engine(SQLALCHEMY_DATABASE_URL, echo=True)
SessionLocal = sqlalchemy.orm.sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = sqlalchemy.orm.declarative_base()

art_to_tag_table = Table('art_to_tag', Base.metadata,
                         Column('art_id', Integer, ForeignKey('art.id')),
                         Column('tag_id', Integer, ForeignKey('tag.id')))

"""art_to_art_collection = Table('art_to_art_collection', Base.metadata,
                              Column('collection_id', Integer, ForeignKey('art_collection.id')),
                              Column('art_id', Integer, ForeignKey('art.id')),
                              Column('ranking', String))"""

artist_to_topic_table = Table('artist_to_topic', Base.metadata,
                              Column('artist_id', Integer, ForeignKey('artist.id')),
                              Column('topic_id', Integer, ForeignKey('topic.id')))


class DBTagImplication(Base):
    __tablename__ = 'tag_implication'

    root_tag = Column(Integer, ForeignKey('tag.id'), primary_key=True)
    implicate = Column(Integer, ForeignKey('tag.id'), primary_key=True)


class DBTagAlias(Base):
    __tablename__ = 'tag_alias'

    tag1 = Column(Integer, ForeignKey('tag.id'), primary_key=True)
    tag2 = Column(Integer, ForeignKey('tag.id'), primary_key=True)


class DBPresence(Base):
    __tablename__ = "presence"

    name = Column(String(20), primary_key=True)
    domain = Column(String(20), primary_key=True)
    link = Column(String, nullable=True)
    artist_id = Column(Integer, ForeignKey('artist.id', ondelete="CASCADE"), nullable=False)

    artist = relationship("DBArtist", back_populates="presences")
    arts = relationship("DBArt", secondary="art_to_presence", back_populates="presences",
                        cascade="delete, all")


class DBArt(Base):
    __tablename__ = 'art'

    id = Column(Integer, primary_key=True, index=True)
    md5_hash = Column(String(32), nullable=False, unique=True)
    path = Column(String, nullable=False, unique=True)
    title = Column(String, nullable=True)
    link = Column(String, nullable=True)
    description = Column(String, nullable=True)

    tags = relationship("DBTag", secondary=art_to_tag_table, back_populates="art", viewonly=True)
    collections = relationship("DBCollection", secondary="art_to_art_collection", back_populates="art")
    presences = relationship("DBPresence", secondary="art_to_presence", back_populates="arts")


class DBArt2Presence(Base):
    __tablename__ = "art_to_presence"

    presence_name = Column(String(20), primary_key=True)
    presence_domain = Column(String(20), primary_key=True)
    art_id = Column(Integer, ForeignKey(DBArt.id, ondelete="CASCADE"), primary_key=True)

    __table_args__ = (
        ForeignKeyConstraint(
            ("presence_name", "presence_domain"),
            ["presence.name", "presence.domain"]
        ),
    )


class DBArtist(Base):
    __tablename__ = "artist"

    id = Column(Integer, primary_key=True)
    name = Column(String, nullable=False)

    topics = relationship("DBTopic", secondary="artist_to_topic", back_populates="artists", viewonly=True)
    presences = relationship("DBPresence", back_populates="artist", cascade="all, delete")


class DBCollection(Base):
    __tablename__ = "art_collection"

    id = Column(Integer, primary_key=True)
    name = Column(String, unique=True, nullable=False)
    description = Column(String)

    art = relationship("DBArt", secondary="art_to_art_collection", back_populates="collections")


class DBCollection2Art(Base):
    __tablename__ = "art_to_art_collection"

    collection_id = Column(Integer, ForeignKey(DBCollection.id, ondelete="CASCADE"), primary_key=True)
    art_id = Column(Integer, ForeignKey(DBArt.id, ondelete="CASCADE"), primary_key=True)
    ranking = Column(String)


class DBTopic(Base):  # as of now unused
    __tablename__ = "topic"

    id = Column(Integer, primary_key=True)
    name = Column(String(20), unique=True, nullable=False)
    description = Column(String)

    artists = relationship("DBArtist", secondary="artist_to_topic", back_populates="topics", viewonly=True)


class DBTagCategory(Base):
    __tablename__ = "tag_category"

    category_id = Column(Integer, primary_key=True)
    name = Column(String(20), nullable=False)

    tags = relationship("DBTag", back_populates="category", cascade="all, delete, delete-orphan")


class DBTag(Base):
    __tablename__ = "tag"

    id = Column(Integer, primary_key=True)
    name = Column(String(50), unique=True)
    description = Column(String)
    category_id = Column(Integer, ForeignKey('tag_category.category_id'))

    category = relationship("DBTagCategory", back_populates='tags', foreign_keys=[category_id])
    # TODO check if cascade is required
    art = relationship("DBArt", secondary=art_to_tag_table, back_populates="tags")
    # TODO check if cascade is required
    implications = relationship(DBTagImplication, backref="implied_by",
                                primaryjoin=id == DBTagImplication.root_tag,
                                cascade="all, delete, delete-orphan")
    alias = relationship(DBTagAlias, backref="alias",
                         primaryjoin=(id == DBTagAlias.tag1) or (id == DBTagAlias.tag2),
                         cascade="all, delete, delete-orphan")


Base.metadata.create_all(bind=engine)


class Database:
    __db: sqlalchemy.orm.Session = None

    def __get_db(self) -> sqlalchemy.orm.Session:
        Database.__db = SessionLocal() if Database.__db is None else Database.__db
        try:
            return Database.__db
        finally:
            pass

    def __del__(self):
        Database.__db.close()
        Database.__db = None

    # Art

    def get_art_list(self) -> List[DBArt]:
        return self.__get_db().query(DBArt).all()  # TODO FIX StackOverflow

    def get_art_by_id(self, art_id: int) -> DBArt:
        return self.__get_db().query(DBArt).where(DBArt.id == art_id).first()

    def get_art_by_hash(self, md5_hash: str) -> DBArt:
        return self.__get_db().query(DBArt).filter(func.lower(DBArt.md5_hash) == md5_hash.lower()).first()

    def create_art_by_model(self, art: ArtnoID):
        if not (isinstance(art.path, str) and len(art.path) > 0):
            raise ValueError("New Art must contain a path!")

        db_art = DBArt(title=art.title, md5_hash=art.hash, path=art.path, link=art.link, description=art.description)

        if self.get_art_by_hash(art.hash) is not None:
            raise ValueError("New Art must not contain already known hashes! Is this really new?")

        db = self.__get_db()
        db.add(db_art)
        db.commit()

        if art.presences is not None:
            for presence in art.presences:
                if self.get_presence(presence.name, presence.domain) is None:
                    raise ValueError("Used presence did not exist!")
                db_art_presence = DBArt2Presence(presence_name=presence.name, presence_domain=presence.domain,
                                                 art_id=db_art.id)
                db.add(db_art_presence)
            db.commit()

        return db_art

    @DeprecationWarning
    def update_art_by_id(self, art_id: int, title: str, path: str, tags: list, link: str,
                         md5_hash: str, authors: list = None):
        raise NotImplementedError

    @DeprecationWarning
    def update_art_by_hash(self, md5_hash: str, title: str, path: str, tags: list, link: str, authors: list = None):
        raise NotImplementedError

    def update_art_by_model(self, art: Art):
        db_art: DBArt = self.get_art_by_id(art.id)

        db_art.title = art.title if art.title is not None else db_art.title
        db_art.link = art.link if art.link is not None else db_art.link
        db_art.md5_hash = art.hash if art.hash is not None else db_art.md5_hash
        db_art.path = art.path if art.path is not None else db_art.path
        db_art.description = art.description if art.description is not None else db_art.description

        if art.presences is not None:
            for presence in art.presences:
                db_art.presences.append(self.get_presence(presence.name, presence.domain))

        if art.collections is not None:
            for collection in art.collections:
                db_art.collections.append(self.get_collection_by_id(collection.id))

        self.__get_db().commit()

    def delete_art_by_id(self, art_id: int):
        db_art: DBArt = self.get_art_by_id(art_id)
        self.__get_db().delete(db_art)
        self.__get_db().commit()

    @DeprecationWarning
    def delete_art_by_hash(self, md5_hash: str):
        raise NotImplementedError

    # Art -> Presences

    def get_art_presences_by_id(self, art_id: int) -> List[DBArt2Presence]:
        result = self.__get_db().query(DBArt2Presence).filter(DBArt2Presence.art_id == art_id).all()
        return result

    def get_art_presences_by_hash(self, md5_hash: str):
        result = self.__get_db().query(DBArt2Presence).join(DBArt).filter(DBArt.md5_hash == md5_hash).all()
        return result

    @DeprecationWarning  # is this actually needed? superceeded by updating the art.presence field on art
    def update_art_presences_by_id(self, art_id: int,
                                   presences: List[Presence]):  # presences = [("name", "domain"),(...)]
        """
        Creates an art-presence relation for every presence listed
        :param art_id:
        :param presences:
        :return:
        """
        db = self.__get_db()

        for presence in presences:
            art2presence = DBArt2Presence()
            art2presence.art_id = art_id
            art2presence.presence_name = presence.name
            art2presence.presence_domain = presence.domain

            db.add(art2presence)

        db.commit()

    def update_art_presences_by_hash(self, md5_hash: int,
                                     presences: list):  # presences = [("name", "domain"),(...)]
        raise NotImplementedError

    def delete_art_presences_by_id(self, art_id: int, presence_name: str, presence_domain: str):
        art2presences = self.get_art_presences_by_id(art_id)

        art2presence = None
        for rel in art2presences:
            if rel.presence_name.strip() == presence_name.strip() and \
                    rel.presence_domain.strip() == presence_domain.strip():
                art2presence = rel

        if art2presence is None:
            raise ValueError("Unknown art-presence relation")

        self.__get_db().delete(art2presence)
        self.__get_db().commit()

    def delete_art_presences_by_hash(self, md5_hash: str, presence_name: str, presence_domain: str):
        raise NotImplementedError

    # Presence

    def get_presence_list(self) -> List[DBPresence]:
        return self.__get_db().query(DBPresence).all()  # TODO fix StackOverflow

    def get_presence(self, name: str, domain: str) -> DBPresence:
        result = self.__get_db().query(DBPresence) \
            .filter(func.lower(DBPresence.name) == name.lower() and
                    func.lower(DBPresence.domain) == domain.lower()).first()
        return result

    def create_presence(self, name: str, domain: str, artist_id: int, link: str) -> DBPresence:
        if not (len(name) > 0 and len(domain) > 0):
            print(f"Name: \"{name}\" Domain: \"{domain}\"")
            raise ValueError("New Presence must have some name and domain!")

        db_presence = DBPresence(name=name, domain=domain, artist_id=artist_id, link=link)

        db = self.__get_db()
        db.add(db_presence)
        db.commit()

        return db_presence

    def update_presence(self, name: str, domain: str, artist_id: int, link: str):
        db_presence = self.get_presence(name=name, domain=domain)

        db_presence.link = link
        db_presence.artist_id = artist_id

        self.__get_db().commit()

    def delete_presence(self, name: str, domain: str):
        db_presence = self.get_presence(name=name, domain=domain)
        self.__get_db().delete(db_presence)
        self.__get_db().commit()

    # Artist -> Presence

    def get_artist_presences(self, artist_id: int):
        result = self.__get_db().query(DBPresence).filter(DBPresence.artist_id == artist_id).all()
        return result

    # Artist

    def get_artist_list(self):
        return self.__get_db().query(DBArtist).all()  # TODO fix StackOverflow

    def get_artist(self, artist_id: int) -> DBArtist:
        result = self.__get_db().query(DBArtist).where(DBArtist.id == artist_id).first()
        return result

    def create_artist(self, name: str, topics: List[int]) -> DBArtist:
        db_artist = DBArtist(name=name, topics=topics)

        db = self.__get_db()
        db.add(db_artist)
        db.commit()

        return db_artist

    def search_artist(self, name: str) -> Artist:
        result = self.__get_db().query(DBArtist).where(DBArtist.description == name).all()
        return result

    def update_artist(self, artist_id: int, name: str = None, topics: List[int] = None):
        db_artist = self.get_artist(artist_id)

        if name is not None:
            db_artist.description = name
        if topics is not None:
            db_artist.topics = topics

        self.__get_db().commit()

    def delete_artist(self, artist_id: int):
        db_artist = self.get_artist(artist_id)

        self.__get_db().delete(db_artist)
        self.__get_db().commit()  # TODO FIX sqlalchemy.exc.IntegrityError: (psycopg2.errors.ForeignKeyViolation)
        # TODO update or delete on table "artist" violates foreign key constraint "presence_artist_id_fkey" on table "presence"
        # TODO DETAIL:  Key (id)=(83) is still referenced from table "presence".

    # Topic

    def get_topic_list(self):
        return self.__get_db().query(DBTopic).all()  # TODO fix StackOverflow

    def get_topic_by_id(self, id: int) -> DBTopic:
        result = self.__get_db().query(DBTopic).filter(DBTopic.id == id).first()
        return result

    def get_topic_by_name(self, name: str) -> DBTopic:
        result = self.__get_db().query(DBTopic).filter(func.lower(DBTopic.name) == name.lower()).first()
        return result

    def create_topic_by_model(self, topic: TopicNoId):
        if not isinstance(topic.name, str) and len(topic.name) > 2:
            raise ValueError("Topic name must be at least 2 letters long!")

        if self.get_topic_by_name(topic.name) is not None:
            raise ValueError(f"Topic name must be unique! '{topic.name}' already exists!")

        db_topic = DBTopic(name=topic.name, description=topic.description)
        db = self.__get_db()
        db.add(db_topic)
        db.commit()

        return db_topic

    def update_topic_by_model(self, topic: Topic):
        db_topic = self.get_topic_by_id(topic.id)

        db_topic.name = topic.name
        db_topic.description = topic.description

        self.__get_db().commit()

        return db_topic

    def delete_topic_by_id(self, id: int):
        db_topic = self.get_topic_by_id(id)

        self.__get_db().delete(db_topic)
        self.__get_db().commit()

    def delete_topic_by_name(self, name: str):
        raise NotImplementedError

    # Artist -> Topic

    def get_artist_topics(self, artist_id: int):
        result = self.__get_db().query(DBTopic).filter(DBTopic.artists.any(id=artist_id)).all()
        return result

    def update_artist_topics(self, artist_id: int, topic_ids: list):
        raise NotImplementedError

    def delete_artist_topics(self, artist_id: int, topic_ids: list):
        raise NotImplementedError

    # Topic -> Artist

    def get_topic_artists(self, topic_id: int):
        result = self.__get_db().query(DBArtist).filter(DBArtist.topics.any(id=topic_id)).all()
        return result

    def update_topic_artists(self, topic_id: int, artists: list):
        raise NotImplementedError

    def delete_topic_artists(self, topic_id: int):  # deletes only the connections, not the artists
        raise NotImplementedError

    # Tag

    def get_tag_list(self):
        return self.__get_db().query(DBTag).all()  # TODO fix StackOverflow

    def get_tag_by_id(self, tag_id: int) -> DBTag:
        result = self.__get_db().query(DBTag).where(tag_id == DBTag.id).first()
        return result

    def get_tag_by_name(self, name: str) -> DBTag:
        result = self.__get_db().query(DBTag).filter(func.lower(DBTag.name) == name.lower()).first()
        return result

    def create_tag_by_model(self, tag: TagNoID):
        db_tag = self.get_tag_by_name(tag.name)
        if db_tag is not None:
            raise ValueError("Tried to create new tag with a name that is already taken!")
        if tag.category_id is None:
            raise Exception("Tried to create tag with no category!")

        if tag.implications is None:
            tag.implications = []
        if tag.aliases is None:
            tag.aliases = []

        db_tag = DBTag(name=tag.name, description=tag.description, category_id=tag.category_id,
                       implications=tag.implications, alias=tag.aliases)

        db = self.__get_db()
        db.add(db_tag)
        db.commit()

        # TODO check that alias is bidirectional automatically
        # e.g. Alias tag1 -> tag2 needs to also turn up as tag2 -> tag1

        return db_tag

    def update_tag_by_model(self, tag: Tag):
        db_tag = self.get_tag_by_id(tag.id)

        db_categ = self.get_category_by_id(tag.category_id)
        if db_categ is None:
            raise ValueError("The given category id was not found!")

        db_tag.name = tag.name if tag.name is not None else db_tag.name
        db_tag.description = tag.description if tag.description is not None else db_tag.description
        db_tag.category_id = tag.category_id if tag.category_id is not None else db_tag.category_id

        db_tag.alias = tag.aliases if tag.aliases is not None else db_tag.alias
        db_tag.implications = tag.implications if tag.implications is not None else db_tag.implications

        self.__get_db().commit()  # TODO give feedback if alias, implication does not exist

    def delete_tag_by_id(self, tag_id: int):
        db_tag = self.get_tag_by_id(tag_id)
        if db_tag is None:
            raise ValueError("Could not find the tag to delete!")

        db = self.__get_db()
        db.delete(db_tag)
        db.commit()

    def delete_tag_by_model(self, tag: Tag):
        db_tag = self.get_tag_by_id(tag.tag_id)
        if db_tag is None:
            raise ValueError("Could not find the tag to delete!")

        db = self.__get_db()
        db.delete(db_tag)
        db.commit()

    def search_tag_by_name_fuzzy(self, search: str) -> list:  # return a list of tags fitting the fuzzy name search
        result = self.__get_db().query(DBTag).filter(DBTag.name.ilike("%{}%".format(search))) \
            .options(load_only("id", "name")).all()
        return result

    # Tag -> Art

    def get_tag_art(self, tag_id: int):
        result = self.__get_db().query(DBArt).filter(DBArt.tags.any(id=tag_id)).all()
        return result

    def update_tag_art(self, tag_id: int):  # is this useful?
        raise NotImplementedError

    def delete_tag_art(self):  # deletes only the connections, not the art
        raise NotImplementedError

    # Category -> Tag

    def get_category_tags(self, category_id: int):
        result = self.__get_db().query(DBTag).where(DBTag.category_id == category_id).all()
        return result

    def update_category_tags(self, category_id: int, tags: list):
        raise NotImplementedError

    def delete_category_tags(self, category_id: int):
        raise NotImplementedError

    # Category
    def get_category_list(self) -> List[DBTagCategory]:
        result = self.__get_db().query(DBTagCategory).all()  # TODO fix StackOverflow
        return result

    def get_category_by_id(self, category_id: int) -> DBTagCategory:
        result = self.__get_db().query(DBTagCategory).where(DBTagCategory.category_id == category_id).first()
        return result

    def get_category_by_name(self, name: str) -> DBTagCategory:
        result = self.__get_db().query(DBTagCategory).filter(func.lower(DBTagCategory.name) == name.lower()).first()
        return result

    def create_category_by_model(self, category: TagCategorynoID) -> DBTagCategory:
        if not (isinstance(category.name, str) and len(category.name) > 0):
            raise ValueError("New Category must bear a name!")
        if self.get_category_by_name(category.name) is not None:
            raise ValueError("New Tag Category must not contain an already used name! Is this a duplicate?")

        db_category = DBTagCategory(name=category.name)

        db = self.__get_db()
        db.add(db_category)
        db.commit()

        return db_category

    def update_category_by_model(self, category: TagCategory):
        db_category: DBTagCategory = self.get_category_by_id(category_id=category.category_id)
        if self.get_category_by_name(category.name) is not None:
            raise ValueError("New Tag Category must not contain an already used name! "
                             f"Is this ({category.name}) a duplicate?")

        db_category.name = category.name

        self.__get_db().commit()

    def delete_category_by_id(self, category_id: int):
        db_category: DBTagCategory = self.get_category_by_id(category_id)
        if db_category is None:
            raise ValueError(f"Tried to delete unknown category. ID ({category_id}) was not found!")
        try:
            self.__get_db().delete(db_category)
            self.__get_db().commit()
        except psycopg2.IntegrityError as e:
            print(e)

    # Collection
    def get_collection_list(self) -> List[DBCollection]:
        result = self.__get_db().query(DBCollection).all()  # TODO fix StackOverflow
        return result

    def get_collection_by_id(self, id: int):
        result = self.__get_db().query(DBCollection).where(DBCollection.id == id).first()
        return result

    def get_collections_by_name(self, name: str):
        result = self.__get_db().query(DBCollection).where(DBCollection.name == name)
        return result

    def create_collection_by_model(self, coll: CollectionNoID):
        db_collection = DBCollection(name=coll.name, description=coll.description)

        self.__get_db().add(db_collection)
        self.__get_db().commit()

        return db_collection

    def update_collection_by_model(self, coll: Collection):
        db_collection = self.get_collection_by_id(coll.id)
        if db_collection is None:
            raise ValueError("Could not find a collection with this ID!")

        db_collection.name = coll.name
        db_collection.description = coll.description

        self.__get_db().commit()

    def delete_collection_by_id(self, id: int):
        db_collection = self.get_collection_by_id(id)
        if db_collection is None:
            raise ValueError("Could not find a collection with this ID!")

        self.__get_db().delete(db_collection)
        self.__get_db().commit()

    # Art -> Collection
    def get_collection_art(self, collection_id: int):
        return self.__get_db().query(DBCollection2Art).filter(DBCollection2Art.collection_id == collection_id).all()

    # Art <-> Collection

    def get_art_collection_relation(self, art_id: int, collection_id: int) -> DBCollection2Art:
        return self.__get_db().query(DBCollection2Art).filter(DBCollection2Art.collection_id == collection_id,
                                                           DBCollection2Art.art_id == art_id).first()

    def create_art_collection_relation(self, art2collection: Art2CollRelation):
        db_art2collection = DBCollection2Art(art_id=art2collection.art_id,
                                             collection_id=art2collection.collection_id,
                                             ranking=art2collection.ranking)

        self.__get_db().add(db_art2collection)
        self.__get_db().commit()

    def update_art_collection_relation_by_model(self, art_collection_relation: Art2CollRelation):
        db_art2collection = self.get_art_collection_relation(art_id=art_collection_relation.art_id,
                                                             collection_id=art_collection_relation.collection_id)

        db_art2collection.ranking = art_collection_relation.ranking
        self.__get_db().commit()

    def delete_art_collection_relation(self, art_id: int, collection_id: int):
        db_art2collection = self.get_art_collection_relation(art_id=art_id, collection_id=collection_id)
        if db_art2collection is None:
            raise ValueError("Could not find art-collection relation with these IDs!")

        self.__get_db().delete(db_art2collection)
        self.__get_db().commit()

    # Collection -> Art
    def get_art_collections(self, art_id: int):
        return self.__get_db().query(DBCollection2Art).filter(
            DBCollection2Art.art_id == art_id).all()
        # TODO throws error
    # TODO SAWarning: SELECT statement has a cartesian product between FROM element(s) "art_to_art_collection" and FROM element "art_collection".  Apply join condition(s) between each element to resolve.
    #   return self.__get_db().query(DBCollection).filter(DBCollection2Art.art_id == art_id).all()