# Copyright 2013 Red Hat, Inc.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import jsonpatch
import wsme

from oslo.config import cfg

CONF = cfg.CONF


JSONPATCH_EXCEPTIONS = (jsonpatch.JsonPatchException,
                        jsonpatch.JsonPointerException,
                        KeyError)


def validate_limit(limit):
    if limit and limit < 0:
        raise wsme.exc.ClientSideError(_("Limit must be positive"))

    return min(CONF.api.max_limit, limit) or CONF.api.max_limit


def validate_sort_dir(sort_dir):
    if sort_dir not in ['asc', 'desc']:
        raise wsme.exc.ClientSideError(_("Invalid sort direction: %s. "
                                         "Acceptable values are "
                                         "'asc' or 'desc'") % sort_dir)
    return sort_dir
