# Copyright (C) 2016 Avencall
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


from xivo_dao.helpers.db_manager import Session
from xivo_dao.helpers import errors

from xivo_dao.alchemy.callfilter import Callfilter


def find_by(**criteria):
    query = _find_query(criteria)
    return query.first()


def _find_query(criteria):
    query = Session.query(Callfilter)
    for name, value in criteria.iteritems():
        column = getattr(Callfilter, name, None)
        if not column:
            raise errors.unknown(name)
        query = query.filter(column == value)
    return query
