from backend.model.tribe import Tribe
from backend.repository.abstract_repository import AbstractRepository
from backend.repository.tribe_sqlite_repository import TribeRepositoryError


class TribeExists(Exception):
    pass


def add_tribe(tribe: Tribe, tribe_repo: AbstractRepository, conn):
    try:
        tribe_repo.add(tribe)
    except TribeRepositoryError:
        raise TribeExists(f"The tribe {tribe.name} already exists")
    conn.commit()
    return tribe