# Copyright 2012 OpenStack Foundation
# 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 collections
from oslo_utils import encodeutils
from urllib import parse

from heatclient.common import base
from heatclient.common import utils
from heatclient.v1 import stacks

DEFAULT_PAGE_SIZE = 20


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

    def update(self, **fields):
        self.manager.update(self, **fields)

    def delete(self):
        return self.manager.delete(self)

    def data(self, **kwargs):
        return self.manager.data(self, **kwargs)


class EventManager(stacks.StackChildManager):
    resource_class = Event

    def list(self, stack_id, resource_name=None, **kwargs):
        """Get a list of events.

        :param stack_id: ID or name of stack the events belong to
        :param resource_name: Optional name of resources to filter events by
        :rtype: list of :class:`Event`
        """
        params = {}
        if 'filters' in kwargs:
            filters = kwargs.pop('filters')
            params.update(filters)

        for key, value in kwargs.items():
            if value:
                params[key] = value

        if resource_name is None:
            url = '/stacks/%s/events' % stack_id
        else:
            stack_id = self._resolve_stack_id(stack_id)
            url = '/stacks/%s/resources/%s/events' % (
                parse.quote(stack_id),
                parse.quote(encodeutils.safe_encode(resource_name)))
        if params:
            # convert to a sorted dict for python3 predictible order
            params = collections.OrderedDict(sorted(params.items()))
            url += '?%s' % parse.urlencode(params, True)

        return self._list(url, 'events')

    def get(self, stack_id, resource_name, event_id):
        """Get the details for a specific event.

        :param stack_id: ID or name of stack containing the event
        :param resource_name: ID of resource the event belongs to
        :param event_id: ID of event to get the details for
        """
        stack_id = self._resolve_stack_id(stack_id)
        url_str = '/stacks/%s/resources/%s/events/%s' % (
                  parse.quote(stack_id),
                  parse.quote(encodeutils.safe_encode(resource_name)),
                  parse.quote(event_id, ''))
        resp = self.client.get(url_str)
        body = utils.get_response_body(resp)
        return Event(self, body.get('event'))