#
#    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 six

from ceilometerclient.common import base
from ceilometerclient.v2 import options


class Statistics(base.Resource):
    def __repr__(self):
        return "<Statistics %s>" % self._info


class StatisticsManager(base.Manager):
    resource_class = Statistics

    @staticmethod
    def _build_aggregates(aggregates):
        url_aggregates = []
        for aggregate in aggregates:
            if 'param' in aggregate:
                url_aggregates.insert(
                    0,
                    "aggregate.param=%(param)s" % aggregate
                )
                url_aggregates.insert(
                    0,
                    "aggregate.func=%(func)s" % aggregate
                )
            else:
                url_aggregates.append(
                    "aggregate.func=%(func)s" % aggregate
                )
        return url_aggregates

    def list(self, meter_name, q=None, period=None, groupby=[], aggregates=[]):
        p = ['period=%s' % period] if period else []
        if isinstance(groupby, six.string_types):
            groupby = [groupby]
        p.extend(['groupby=%s' % g for g in groupby] if groupby else [])
        p.extend(self._build_aggregates(aggregates))
        return self._list(options.build_url(
            '/v2/meters/' + meter_name + '/statistics',
            q, p))
