import psycopg2
from psycopg2.errors import *
from psycopg2.errorcodes import UNIQUE_VIOLATION


class DBAdapter:

    EXPECTED_TABLES = ['art', 'artist', 'tag', 'topic', 'presence', 'artist_topic', 'art_author',
                       'art_tag', 'tag_alias', 'tag_implication', 'tag_category']

    def __init__(self, user: str, password: str, host: str = "localhost", port: int = 5432, database: str = "artnet"):
        self.db = None
        self.db_cursor = None
        try:
            self.db = psycopg2.connect(host=host, port=port, database=database, user=user, password=password)
            self.db_cursor = self.db.cursor()

        except psycopg2.OperationalError as e:
            raise ValueError("Invalid DB credentials!")
        print("DB connection to {0}:{1}/{2}".format(host, port, database))

        if not self.check_tables():
            raise ValueError("Invalid DB schema")

    def check_tables(self) -> bool:
        """
        Check if all the expected tables are present in the connected database.
        :return:
        """
        self.db_cursor.execute("select relname from pg_class where relkind='r' and relname !~ '^(pg_|sql_)';")
        present_tables = self.db_cursor.fetchall()
        unknown_tables = []
        missing = [x for x in DBAdapter.EXPECTED_TABLES]
        for table in present_tables:
            table = table[0]
            if table not in DBAdapter.EXPECTED_TABLES:
                unknown_tables.append(table)
            else:
                missing.remove(table)

        if len(missing) > 0:
            print("The following tables are missing from the currently connected database: {0}".format(missing))
            return False

        if len(unknown_tables) > 0:
            print("The following tables are unknown and not expected inside the database: {0}".format(unknown_tables))

        return True

    def save_image(self, ID: str, title: str, authors: list, path: str, tags: list, link: str, md5_hash: str):
        """
        Updates or saves the given image data to the DB
        :param ID:
        :param title:
        :param authors: list of presences List[Tuple[str, str]]
        :param path:
        :param tags:  list of tag names List[str]
        :param link:
        :param md5_hash: md5 hash as a hex digest
        :return:
        """
        print("Saving Image {0}:{1} authors: {2} path: {3} tags: {4} link: {5} hash:{6}"
              .format(ID, title, authors, path, tags, link, md5_hash))
        d = {"title": title, "path": path, "id": ID, "link": link, "hash": md5_hash}
        if self.get_art_by_path(path) is None:
            if ID is None:
                self.db_cursor.execute(
                    "INSERT INTO art (path, title, link, md5_hash) VALUES (%(path)s, %(title)s, %(link)s, %(hash)s)",
                    d)
                ID = self.get_art_by_path(path)["ID"]
                d["id"] = ID
            elif self.get_tag_by_ID(ID) is None:
                self.db_cursor.execute(
                    "INSERT INTO art (path, title, link, md5_hash) VALUES (%(path)s, %(title)s, %(link)s, %(hash)s)", d)
        else:
            self.db_cursor.execute("UPDATE art SET path = %(path)s, title = %(title)s, link = %(link)s, " +
                                   "md5_hash = %(hash)s WHERE id = %(id)s", d)

        if ID is None:
            ID = self.get_art_by_path(path)["ID"]
            assert(ID != None)

        old_tags = [self.get_tag_by_ID(x)[0][1].strip() for x in self.get_art_tags_by_ID(ID)]
        for tag in tags:
            if tag in old_tags:  # already present
                continue
            d = {"id": ID, "tag": self.get_tag_ID(tag)}
            try:
                self.db_cursor.execute("INSERT INTO art_tag (art_id, tag_ID) VALUES (%(id)s, %(tag)s)", d)
            except psycopg2.Error as e:
                if e.pgcode == UNIQUE_VIOLATION:
                    print(e)
                    print("Skipping Unique Violation ...")
                else:
                    raise e

        for old_tag in old_tags:
            if old_tag not in tags:  # need to remove old tag
                self.remove_tag_from_image(art_ID=ID, tag_ID=self.get_tag_ID(old_tag))

        old_authors = self.get_authors_of_art_by_ID(ID)
        for author in authors:
            if author in old_authors:
                continue
            d = {"id": ID, "author_name": author[0], "author_domain": author[1]}
            self.db_cursor.execute("INSERT INTO art_author (presence_name, presence_domain, art_ID) " +
                                   "VALUES (%(author_name)s, %(author_domain)s, %(id)s)", d)
        for old_author_name, old_author_domain in old_authors:
            if (old_author_name, old_author_domain) not in authors:  # need to remove old author
                self.remove_artist_from_image(art_ID=ID, presence_name=old_author_name,
                                              presence_domain=old_author_domain)

        self.db.commit()

    def remove_image(self, hash: str):
        """
        Removes an image completely from the database.

        Does not affect tags or artists but removes art-tag, art-artist relations
        :param hash: md5 hash of the image to be deleted
        :return:
        """
        image_data = self.get_art_by_hash(hash)
        art_ID = image_data["ID"]
        print(f"Deleting image #{art_ID} {image_data['title']}")
        tags = self.get_art_tags_by_ID(art_ID)
        for tag_ID in tags:
            pass
            #self.remove_tag_from_image(art_ID=art_ID, tag_ID=tag_ID)
        authors = self.get_authors_of_art_by_ID(art_ID)
        for presence_name, presence_domain in authors:
            pass
            #self.remove_artist_from_image(art_ID=art_ID, presence_name=presence_name, presence_domain=presence_domain)

        #self.db_cursor.execute("DELETE FROM art WHERE md5_hash = %(hash)s", {"hash": hash})



    def remove_artist_from_image(self, art_ID, presence_name, presence_domain):
        """
        Removes the relationship between an artist and the image
        :param art_ID:
        :param presence_name:
        :param presence_domain:
        :return:
        """
        d = {"name": presence_name, "domain": presence_domain, "id": art_ID}
        self.db_cursor.execute("DELETE FROM art_author " +
                               "WHERE presence_name = %(name)s and " +
                               "presence_domain = %(domain)s and art_ID = %(id)s",
                               d)

    def remove_tag_from_image(self, art_ID, tag_ID):
        """
        Remove the relationship between a tag and the image
        :param art_ID:
        :param tag_ID:
        :return:
        """
        d = {"id": art_ID, "tag": tag_ID}
        self.db_cursor.execute("DELETE FROM art_tag WHERE art_id = %(id)s and tag_id = %(tag)s", d)

    def save_presence(self, name: str, domain: str, artist_ID: int, link: str):
        """
        Save the presence entry with the given data.

        If it doesn't exist a new one will be created.
        If the artist ID is unknown an exception will be thrown
        :param name:
        :param domain:
        :param artist_ID:
        :param link:
        :return:
        """
        print("Saving Presence {0}:{1} Artist: {2} Link: {3}".format(name, domain, artist_ID, link))
        artist = self.get_artist(artist_ID)
        if artist is None or len(artist) == 0:
            raise Exception("Unknown Artist to create/update Presence with!")

        presence = self.get_presence(name, domain)
        d = {"name": name, "domain": domain, "artist": artist_ID, "link": link}
        if len(presence) == 0:  # presence does not exist yet
            self.db_cursor.execute("INSERT INTO presence (name, domain, artist_ID, link) " +
                                   "VALUES (%(name)s, %(domain)s, %(artist)s, %(link)s)", d)
        else:  # presence exists, update it
            self.db_cursor.execute("UPDATE presence SET artist_ID = %(artist)s, link = %(link)s" +
                                   "WHERE name = %(name)s and domain = %(domain)s", d)

        self.db.commit()

    def remove_presence(self, name: str, domain: str):
        """
        Remove a presence from the database
        :return:
        """
        print("Removing Presence {0}:{1}".format(name, domain))
        d = {"name": name, "domain": domain}
        self.db_cursor.execute("DELETE FROM presence WHERE name = %(name)s and domain = %(domain)s", d)
        self.db.commit()

    def get_presence(self, name: str, domain: str):
        """
        Queries the database for the presence and returns the result

        :param name:
        :param domain:
        :return:
        """
        d = {"name": name, "domain": domain}
        self.db_cursor.execute("SELECT name, domain, artist_ID, link FROM presence " +
                               "WHERE name = %(name)s and domain = %(domain)s",
                               d)
        rows = self.db_cursor.fetchall()
        new_rows = []
        for row in rows:
            new_rows.append((row[0].strip(), row[1].strip(), row[2], row[3]))

        return new_rows

    def save_artist(self, ID: int, description: str):
        """
        Save (or update if ID is already taken) an artist to the DB
        :param ID:
        :param description:
        :return:
        """
        print("Saving artist {0}:{1}".format(ID, description))
        d = {"id": ID, "description": description}
        if ID is None:  # no ID given, auto generate it
            self.db_cursor.execute("INSERT INTO artist (description) VALUES (%(description)s)", d)
        elif len(self.get_artist(ID)) != 0:  # artist exists already:
            self.db_cursor.execute("UPDATE artist SET description = %(description)s WHERE id = %(id)s", d)
        else:  # artist needs to be created
            self.db_cursor.execute("INSERT INTO artist (id, description) VALUES (%(id)s, %(description)s)", d)
        self.db.commit()

    def remove_artist(self, ID: int):
        """
        Deletes the artist from the DB
        :param ID:
        :return:
        """
        print("Deleting artist {0}".format(ID))
        d = {"id": ID}
        self.db_cursor.execute("DELETE FROM Artist WHERE ID = %(id)s", d)
        self.db.commit()

    def save_category(self, name: str):
        """
        Save the category to the DB.

        Does not check if the category already exists
        :param name:
        :return:
        """
        print("Saving category {0}!".format(name))
        d = {"name": name}
        self.db_cursor.execute("INSERT INTO tag_category (name) VALUES (%(name)s)", d)

        self.db.commit()

    def remove_category(self, name: str):
        """
        Remove the category from the DB.
        :param name:
        :return:
        """
        d = {"name": name}
        self.db_cursor.execute("DELETE FROM tag_category WHERE name = %(name)s", d)

        self.db.commit()

    def get_category_by_ID(self, id: int):
        """
        Queries the database for the category by its ID
        :param id:
        :return: (id, "name")
        """
        d = {"id": id}
        self.db_cursor.execute("SELECT category_id, name FROM tag_category WHERE category_id = %(id)s", d)

        r = self.db_cursor.fetchall()
        if len(r) == 0:
            return None

        nr = []
        for i in range(len(r[0])):
            if isinstance(r[0][i], str):
                nr.append(r[0][i].strip())
            else:
                nr.append(r[0][i])

        return nr

    def get_category_by_name(self, name: str):
        """
        Queries the database for the category by its name
        :return:
        """
        d = {"name": name}
        self.db_cursor.execute("SELECT category_id, name FROM tag_category WHERE name = %(name)s", d)

        r = self.db_cursor.fetchall()
        if len(r) == 0:
            return None

        return r[0]

    def get_artist(self, ID: int):
        """
        Queries the database for the artist (not presence) and returns the result
        :param ID:
        :return:
        """
        d = {"id": ID}
        self.db_cursor.execute("SELECT id, description FROM artist WHERE id = %(id)s", d)

        return self.db_cursor.fetchall()

    def get_artist_presences(self, id: int):
        """
        Queries the databse for all presences associated with the artist and returns the result
        :param id:
        :return:
        """
        d = {"id": id}
        self.db_cursor.execute("SELECT name, domain, artist FROM Presence WHERE artist = %(id)s", d)

        return self.db_cursor.fetchall()

    def get_all_artists(self):
        """
        Lists all available artists (not presences) and returns the result
        :return:
        """
        self.db_cursor.execute("SELECT id, description FROM artist")

    def get_art_by_hash(self, file_hash: str) -> dict:
        """
        Queries the database for the art via its hash and returns it if available.

        Currently uses an md5 hash
        :param file_hash:
        :return:
        """
        d = {"hash": file_hash}
        self.db_cursor.execute("SELECT id, path, title, link, md5_hash FROM art where md5_hash = %(hash)s", d)

        result = self.db_cursor.fetchall()

        if len(result) == 0:
            return None
        else:
            result = result[0]
            image_data = {
                "ID": result[0],
                "path": result[1],
                "title": result[2],
                "link": result[3],
                "md5_hash": result[4],
            }
            return image_data

    def get_art_by_path(self, path: str) -> dict:
        """
        Queries the database for the art via its path and returns it if available.

        Otherwise None
        :param path:
        :return:
        """
        d = {"path": path}
        self.db_cursor.execute("SELECT id, path, title, link, md5_hash FROM art where path = %(path)s", d)

        result = self.db_cursor.fetchall()

        if len(result) == 0:
            return None
        else:
            result = result[0]
            image_data = {
                "ID": result[0],
                "path": result[1],
                "title": result[2],
                "link": result[3],
                "md5_hash": result[4],
            }
            return image_data

    @DeprecationWarning
    def get_authors_of_art(self, path: str):
        """
        Get the authors (presence and author) of the given art.
        :param path:
        :return:
        """
        art_data = self.get_art_by_path(path)
        art_id: int = None
        if art_data is not None:
            art_id = art_data["ID"]
        if art_id is None:
            return None
        d = {"id": art_id}

        self.db_cursor.execute("SELECT presence_name, presence_domain FROM art_author WHERE art_ID = %(id)s", d)
        presences = self.db_cursor.fetchall()

        result = []
        for name, domain in presences:
            result.append((name.strip(), domain.strip()))

        return result

    def get_authors_of_art_by_ID(self, id: int):
        """
        Get the authors (presence and author) of the given art.
        :param id:
        :return:
        """
        d = {"id": id}

        self.db_cursor.execute("SELECT presence_name, presence_domain FROM art_author WHERE art_ID = %(id)s", d)
        presences = self.db_cursor.fetchall()

        result = []
        for name, domain in presences:
            result.append((name.strip(), domain.strip()))

        return result

    def get_art_tags_by_ID(self, art_ID: int):
        """
        Query the database for all tags associated with a given art ID
        :param art_ID:
        :return:
        """
        d = {"id": art_ID}
        self.db_cursor.execute("SELECT tag_ID FROM art_tag WHERE art_id = %(id)s", d)

        rows = self.db_cursor.fetchall()
        new_rows = []
        for row in rows:
            new_rows.append(row[0])
        return new_rows

    def search_fuzzy_presence(self, name: str, domain: str, all_if_empty: bool = False):
        """
        Search a list of presences fitting the (name, domain) fuzzy.
        :param name:
        :param domain:
        :param all_if_empty: return all presences (or a large selection) if an empty name and domain is given
        :return:
        """
        if all_if_empty and (name is None or len(name) == 0) and (domain is None or len(domain) == 0):
            self.db_cursor.execute("SELECT name, domain, artist_id FROM presence")
        else:
            self.db_cursor.execute("SELECT name, domain, artist_id FROM presence WHERE LOWER(name) LIKE LOWER('%{0}%')".format(name) +
                                   " AND domain LIKE '%{0}%'".format(domain))
        rows = self.db_cursor.fetchall()

        result = []
        for row in rows:
            result.append((row[0].strip(), row[1].strip()))
        return result

    def get_presences_art(self, name, domain):
        """
        Query a list of all art that includes the given presence as their author
        :param name:
        :param domain:
        :return:
        """
        d = {"name": name, "domain": domain}
        self.db_cursor.execute(
            "SELECT art_ID FROM Art_Author WHERE presence_name = %(name)s and presence_domain = %(domain)s", d)

        return self.db_cursor.fetchall()

    def get_all_categories(self) -> list:
        """
        Return all categories in the database.
        :return:
        """
        self.db_cursor.execute("SELECT name FROM tag_category")

        rows = []
        for row in self.db_cursor.fetchall():
            rows.append(row[0].strip())

        return rows

    def search_fuzzy_categories(self, search: str) -> list:
        """
        Search a list of categories fitting search fuzzy.
        :param search:
        :return:
        """
        self.db_cursor.execute("SELECT name FROM tag_category WHERE LOWER(name) LIKE LOWER('%{0}%')".format(search))

        rows = []
        for row in self.db_cursor.fetchall():
            rows.append(row[0])

        return rows

    def search_fuzzy_tag(self, name: str, all_if_empty: bool = False) -> list:
        """
        Search a list of tags fitting name fuzzy.
        :param name:
        :param all_if_empty:
        :return:
        """
        if all_if_empty and len(name) == 0:
            self.db_cursor.execute("SELECT name, description, category_id FROM tag")
        else:
            self.db_cursor.execute("SELECT name, description, category_id FROM tag WHERE LOWER(name) LIKE LOWER('%{0}%')".format(name))

        rows = self.db_cursor.fetchall()
        new_rows = []
        for i in range(len(rows)):
            new_rows.append([])
            for j in range(len(rows[i])):
                if rows[i][j] is None:
                    new_rows[i].append("")
                elif isinstance(rows[i][j], str):
                    new_rows[i].append(rows[i][j].strip())
                else:
                    new_rows[i].append(rows[i][j])

        return new_rows

    def search_fuzzy_artists(self, ID: int, description: str, all_if_empty: bool = False):
        """
        Search a list of fitting artists fuzzy.

        If ID is None it will search using the description
        :param ID:
        :param description:
        :param all_if_empty:
        :return:
        """
        if ID is not None:
            self.db_cursor.execute("SELECT id, description FROM artist WHERE id = %(id)s", {"id": ID})
        elif all_if_empty and ID is None and len(description) == 0:
            self.db_cursor.execute("SELECT id, description FROM artist")
        else:
            self.db_cursor.execute("SELECT id, description FROM artist WHERE LOWER(description) LIKE LOWER('%{0}%')"
                                   .format(description))

        return self.db_cursor.fetchall()

    def create_tag(self, name: str, description: str, aliases: list, implications: list, category: str = None):
        name = name.strip()
        if aliases is None:
            aliases = []
        if implications is None:
            implications = []
        category_id = self.get_category_by_name(category)[0]
        d = {"name": name, "description": description, "category_id": category_id}
        self.db_cursor.execute("INSERT INTO tag (name, description, category_id) " +
                               "VALUES (LOWER(%(name)s), %(description)s, %(category_id)s)", d)

        for alias in aliases:
            self.add_alias_by_name(name, alias)
        for implicant in implications:
            self.add_implication_by_name(name, implicant)

        self.db.commit()

    def edit_tag(self, tag_id: int, name: str, description: str, aliases: list = None, implications: list = None,
                 category_id: int = None):
        """
        Edit a tag with the new given data
        :param tag_id: tag id to uniquely identify the tag
        :param name: unique tag name to apply edits to (distinct from old_tag)
        :param description: new description to apply, set to None to omit
        :param aliases: list of tag names to be the alias of this tag, set to None to omit
        :param implications: list of tag names to be implied by this tag, set to None to omit
        :param category_id:
        :return:
        """
        name = name.strip().lower()
        implications = [self.get_tag_ID(x) for x in implications]
        aliases = [self.get_tag_ID(x) for x in aliases]
        d = {
            "id": tag_id,
            "name": name,
            "description": description,
            "alias": aliases,
            "implications": implications,
            "category_id": category_id,
        }

        self.db_cursor.execute("UPDATE tag SET description = %(description)s, category_id = %(category_id)s, name = %(name)s WHERE tag_ID = %(id)s", d)

        if aliases is not None:
            old_aliases = self.get_tag_aliases_by_ID(tag_id)
            for alias in aliases:
                if alias in old_aliases:  # is this already set?
                    continue
                self.add_alias_by_ID(tag_id, alias)

            for old_alias in old_aliases:
                if old_alias not in aliases:  # got to delete an alias?
                    self.remove_alias_by_ID(tag_id, old_alias)

        if implications is not None:
            old_implicants = self.get_tag_implications_by_ID(tag_id)
            for implicant in implications:
                if implicant in old_implicants:  # is this already set?
                    continue
                self.add_implication_by_ID(tag_id, implicant)

            for old_implicant in old_implicants:
                if old_implicant not in implications:  # got to delete an implicant?
                    self.remove_implication_by_ID(tag_id, old_implicant)

    def add_alias_by_name(self, name: str, alias: str):
        """
        Add the alias pair to the database
        :param name: 
        :param alias: 
        :return: 
        """
        self.add_alias_by_ID(self.get_tag_ID(name), self.get_tag_ID(alias))

    def add_alias_by_ID(self, tag1: int, tag2: int):
        """
        Add the alias pair to the database
        :return:
        """
        d = {
            "tag1": tag1,
            "tag2": tag2
        }
        self.db_cursor.execute("INSERT INTO tag_alias (tag1, tag2) VALUES (%(tag1)s, %(tag2)s)", d)
        self.db.commit()

    def remove_alias_by_ID(self, tag1: int, tag2: int):
        """
        Remove alias pair from the database
        :param tag1:
        :param tag2:
        :return:
        """
        d = {
            "tag1": tag1,
            "tag2": tag2
        }
        self.db_cursor.execute("DELETE FROM tag_alias WHERE (tag1 = %(tag1)s and tag2 = %(tag2)s) or " +
                               "(tag1 = %(tag2)s and tag2 = %(tag1)s)", d)
        self.db.commit()

    def remove_alias_by_name(self, name: str, alias: str):
        """
        Remove alias pair from the database
        :param name:
        :param alias:
        :return:
        """
        self.remove_alias_by_ID(self.get_tag_ID(name), self.get_tag_ID(alias))

    def add_implication_by_ID(self, tag_id: int, implicant: int):
        """
        Add the implication to the database
        :param tag_id:
        :param implicant:
        :return:
        """
        d = {
            "tag": tag_id,
            "implicant": implicant
        }
        self.db_cursor.execute("INSERT INTO tag_implication (root_tag, implicate) VALUES (%(tag)s, %(implicant)s)",
                               d)
        self.db.commit()


    def add_implication_by_name(self, name: str, implicant: str):
        """
        Add the implication to the database
        :param name:
        :param implicant:
        :return:
        """
        self.add_implication_by_ID(self.get_tag_ID(name), self.get_tag_ID(implicant))

    def remove_implication_by_ID(self, tag: int, implicant: int):
        """
        Remove the implication pair from the database
        :param tag:
        :param implicant:
        :return:
        """
        d = {
            "tag": tag,
            "implicant": implicant
        }
        self.db_cursor.execute("DELETE FROM tag_implication WHERE root_tag = %(tag)s " +
                               "and implicate = %(implicant)s", d)
        self.db.commit()

    def remove_implication_by_name(self, name: str, implicant: str):
        """
        Remove the implication pair from the database
        :param name:
        :param implicant:
        :return:
        """
        self.remove_implication_by_ID(self.get_tag_ID(name), self.get_tag_ID(implicant))

    def remove_tag_by_ID(self, tag: int):
        """
        Remove the given tag from the database
        :param tag:
        :return:
        """
        d = {"tag": tag}
        self.db_cursor.execute("DELETE FROM tag WHERE tag_id = %(tag)s", d)
        self.db.commit()

    def remove_tag_by_name(self, name: str):
        """
        Remove the given tag from the database
        :param name:
        :return:
        """
        self.remove_tag_by_ID(self.get_tag_ID(name))

    def get_tag_ID(self, name: str) -> int:
        """
        Get the tag ID by querying it by its unique name
        :param name:
        :return:
        """
        d = {"name": name}
        self.db_cursor.execute("SELECT tag_ID FROM tag where LOWER(name) = LOWER(%(name)s)", d)

        rows = []
        for row in self.db_cursor.fetchall():
            rows.append(row[0])

        if len(rows) > 1:
            raise Exception("Found multiple tags by the same name!")
        elif len(rows) == 0:
            return None

        return rows[0]

    def get_tag_by_name(self, name: str) -> list:
        """
        Search the tag in the DB via its name.

        Note: name is constrained to be unique by the DB
        :param name:
        :return: Returns the tag's name, description, category, tag ID
        """
        d = {"name": name}
        self.db_cursor.execute("SELECT name, description, category_id, tag_ID FROM tag where LOWER(name) = LOWER(%(name)s)", d)

        rows = []
        for row in self.db_cursor.fetchall():
            new_row = []
            for value in row:
                if value is None:
                    new_row.append("")
                elif type(value) == str:
                    new_row.append(value.strip())
                else:
                    new_row.append(value)
            rows.append(new_row)
        return rows

    def get_tag_by_ID(self, ID: int) -> list:
        """
        Search the tag in the DB via its ID.

        Note: name is constrained to be unique by the DB
        :param ID:
        :return: Returns the tag's ID, name, description, category
        """
        d = {"ID": ID}
        self.db_cursor.execute("SELECT tag_ID, name, description, category_id FROM tag where tag_ID = %(ID)s", d)

        return self.db_cursor.fetchall()

    def get_tag_aliases_by_name(self, name: str) -> list:
        """
        Search for the tag's aliases and the tag's aliases
        :param name:
        :return: List of tag Names that are aliases of this one
        """
        aliases = self.get_tag_aliases_by_ID(self.get_tag_ID(name))
        result = []
        for alias in aliases:
            tag_data = self.get_tag_by_ID(alias)
            if len(tag_data) > 0:
                result.append(tag_data[0][1].strip())
        return result

    def get_tag_aliases_by_ID(self, tag_ID: int) -> list:
        """
        Search for the tag's aliases and the tag's aliases
        :param tag_ID:
        :return: List of tag IDs that are aliases of this one
        """
        marked = []
        to_search = [tag_ID]
        while len(to_search) != 0:
            curr_alias = to_search.pop()
            found_aliases = self.__get_tag_aliases_no_recurse(curr_alias)
            marked.append(curr_alias)

            for found_alias in found_aliases:
                if found_alias not in marked:
                    to_search.append(found_alias)

        marked.remove(tag_ID)
        return marked

    def get_all_tag_implications_by_name(self, name: str) -> list:
        """
        Search for the tag's implications and those that are implied by them.
        :param name:
        :return:
        """
        root_ID = self.get_tag_ID(name)
        collected_tags = self.get_tag_implications_by_ID(root_ID)
        collected_tags.append(root_ID)
        to_search = self.get_tag_implications_by_ID(root_ID)

        while len(to_search) != 0:
            curr_tag = to_search.pop()
            found_implications = self.get_tag_implications_by_ID(curr_tag)
            for found in found_implications:
                if found in collected_tags:
                    continue
                else:
                    collected_tags.append(found)
                    to_search.append(found)

        collected_tags.remove(root_ID)

        result = []
        for tag_ID in collected_tags:
            tag_data = self.get_tag_by_ID(tag_ID)
            if len(tag_data) != 0:
                result.append(tag_data[0][1].strip())
        return result

    def get_tag_implications_by_ID(self, ID: int) -> list:
        """
        Search for the tag's implications
        :param ID: ID of the tag
        :return: returns a list of IDs that are implied
        """
        d = {"ID": ID}
        if d["ID"] is None:
            return []

        self.db_cursor.execute("SELECT root_tag, implicate FROM Tag_Implication WHERE root_tag = %(ID)s", d)

        rows = self.db_cursor.fetchall()
        if len(rows) == 0:
            return []

        r = []
        for row in rows:
            r.append(row[1])

        return r

    def get_tag_implications(self, name: str) -> list:
        """
        Search for the tag's implications
        :param name:
        :param output_ID: Don't resolve the tag ids into names in the resulting list
        :return: List of tag ids
        """
        d = {"ID": self.get_tag_ID(name)}
        if d["ID"] is None:
            return []

        self.db_cursor.execute("SELECT root_tag, implicate FROM Tag_Implication WHERE root_tag = %(ID)s", d)

        rows = self.db_cursor.fetchall()
        if len(rows) == 0:
            return []

        r = []
        for row in rows:
            r.append(row[1])

        result = [self.get_tag_by_ID(v) for v in r]

        r = []
        for value in result:
            r.append(value[0][1].strip())

        return r

    def get_tag_impliers(self, name: str) -> list:
        """
        Search for tags that imply this one.
        :param name:
        :return:
        """
        d = {"ID": self.get_tag_ID(name)}
        self.db_cursor.execute("SELECT root_tag, implicate FROM Tag_Implication WHERE implicate = %(ID)s", d)

        rows = self.db_cursor.fetchall()
        r = []
        for row in rows:
            r.append(row[0])
        return r

    def __get_tag_aliases_no_recurse(self, tag_id: int) -> list:
        """
        Search for the tag's aliases
        :param tag_id:
        :return:
        """
        d = {"ID": tag_id}
        if d["ID"] is None:
            return []

        self.db_cursor.execute("SELECT tag1, tag2 FROM Tag_Alias "
                               "WHERE tag1 = %(ID)s or tag2 = %(ID)s", d)
        rows = self.db_cursor.fetchall()
        r = []
        for row in rows:
            if row[0] == tag_id:
                r.append(row[1])
            elif row[1] == tag_id:
                r.append(row[0])
            else:
                raise Exception("Something went terribly wrong!")

        return r