# Copyright 2019 Canonical Ltd
#
# 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.

from charms.reactive import (
    Endpoint,
    clear_flag,
    set_flag,
    when,
    when_any,
)


class PlacementProvides(Endpoint):

    @when('endpoint.{endpoint_name}.joined')
    def joined(self):
        set_flag(self.expand_name('{endpoint_name}.connected'))

    @when('endpoint.{endpoint_name}.changed')
    def changed(self):
        clear_flag(self.expand_name('endpoint.{endpoint_name}.changed'))
        set_flag(self.expand_name('{endpoint_name}.available'))

    @when_any('endpoint.{endpoint_name}.broken',
              'endpoint.{endpoint_name}.departed')
    def departed(self):
        clear_flag(self.expand_name('{endpoint_name}.available'))
        clear_flag(self.expand_name('{endpoint_name}.connected'))

    def get_nova_placement_disabled(self):
        return self.all_joined_units.received['nova_placement_disabled']

    def set_placement_enabled(self):
        for relation in self.relations:
            relation.to_publish_raw['placement_enabled'] = True