# Copyright 2017 Huawei Technologies Co.,LTD.
# 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 cyborg.common.i18n import _


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


def apply_jsonpatch(doc, patch):
    for p in patch:
        if p['op'] == 'add' and p['path'].count('/') == 1:
            if p['path'].lstrip('/') not in doc:
                msg = _(
                    'Adding a new attribute (%s) to the root of '
                    ' the resource is not allowed'
                )
                raise wsme.exc.ClientSideError(msg % p['path'])
    return jsonpatch.apply_patch(doc, jsonpatch.JsonPatch(patch))
