# -*- coding: utf-8; -*-
################################################################################
#
#  Rattail -- Retail Software Framework
#  Copyright © 2010-2020 Lance Edgar
#
#  This file is part of Rattail.
#
#  Rattail is free software: you can redistribute it and/or modify it under the
#  terms of the GNU General Public License as published by the Free Software
#  Foundation, either version 3 of the License, or (at your option) any later
#  version.
#
#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
#  details.
#
#  You should have received a copy of the GNU General Public License along with
#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
#
################################################################################
"""
CORE-POS misc. utilities
"""

import sqlalchemy as sa

from corepos.db.office_op import Session as CoreSession, model as corepos

from rattail.db.util import short_session


def get_max_existing_vendor_id(session=None):
    """
    Returns the "last" (max) existing value for the ``vendors.vendorID``
    column, for use when creating new records, since it is not auto-increment.
    """
    with short_session(Session=CoreSession, session=session) as s:
        return s.query(sa.func.max(corepos.Vendor.id))\
                .scalar() or 0