# Copyright (c) 2014 Rackspace, Inc.
#
# 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 cgi
import itertools
import pprint

from oslo_log import log

LOG = log.getLogger(__name__)


class dict2obj(object):

    """Creates objects that behave much like a dictionaries."""
    def __init__(self, d):
        for k in d:
            if isinstance(d[k], dict):
                self.__dict__[k] = dict2obj(d[k])
            elif isinstance(d[k], (list, tuple)):
                l = []
                for v in d[k]:
                    if isinstance(v, dict):
                        l.append(dict2obj(v))
                    else:
                        l.append(v)
                self.__dict__[k] = l
            else:
                self.__dict__[k] = d[k]

    def __getitem__(self, name):
        if name in self.__dict__:
            return self.__dict__[name]

    def __iter__(self):
        return iter(self.__dict__.keys())

    def __repr__(self):
        return pprint.pformat(self.__dict__)


def help_escape(potentially_bad_string):
    if potentially_bad_string is None:
        LOG.warning('Should not happen: trying to escape a None object')
    return cgi.escape(potentially_bad_string or "")


# remove duplicates
# see http://bit.ly/1mX2Vcb for details
def remove_duplicates(data):
    """Remove duplicates from the data (normally a list).

    The data must be sortable and have an equality operator
    """
    data = sorted(data)
    return [k for k, _ in itertools.groupby(data)]