# Copyright 2020 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.

import mock

from ovsdb_subordinate import provides

import charms_openstack.test_utils as test_utils


_hook_args = {}


class TestOVSDBSubordinateProvides(test_utils.PatchHelper):

    def setUp(self):
        super().setUp()
        self.target = provides.OVSDBSubordinateProvides('some-relation', [])
        self._patches = {}
        self._patches_start = {}

    def tearDown(self):
        self.target = None
        for k, v in self._patches.items():
            v.stop()
            setattr(self, k, None)
        self._patches = None
        self._patches_start = None

    def patch_target(self, attr, return_value=None):
        mocked = mock.patch.object(self.target, attr)
        self._patches[attr] = mocked
        started = mocked.start()
        started.return_value = return_value
        self._patches_start[attr] = started
        setattr(self, attr, started)

    def patch_topublish(self):
        self.patch_target('_relations')
        relation = mock.MagicMock()
        to_publish = mock.PropertyMock()
        type(relation).to_publish = to_publish
        self._relations.__iter__.return_value = [relation]
        return relation.to_publish

    def test__get_ovs_value(self):
        self.patch_object(provides.subprocess, 'run')
        cp = mock.MagicMock()
        cp.stdout = '"hostname-42"\n'
        self.run.return_value = cp
        self.assertEquals(
            self.target._get_ovs_value('tbl', 'col'),
            'hostname-42')
        self.run.assert_called_once_with(
            ('ovs-vsctl', 'get', 'tbl', '.', 'col'),
            stdout=mock.ANY, check=True, universal_newlines=True)
        self.run.reset_mock()
        self.target._get_ovs_value('tbl', 'col', rec='rec')
        self.run.assert_called_once_with(
            ('ovs-vsctl', 'get', 'tbl', 'rec', 'col'),
            stdout=mock.ANY, check=True, universal_newlines=True)

    def test_publish_chassis_name(self):
        self.patch_target('_get_ovs_value')
        to_publish = self.patch_topublish()
        self._get_ovs_value.return_value = 'aHostname'
        self.target.publish_chassis_name()
        to_publish.__setitem__.assert_called_once_with(
            'chassis-name', 'aHostname')

    def test_publish_ovn_configured(self):
        self.patch_object(provides, 'subprocess')
        self.subprocess.CalledProcessError = Exception
        self.patch_target('_get_ovs_value')
        to_publish = self.patch_topublish()
        self._get_ovs_value.side_effect = Exception
        self.target.publish_ovn_configured()
        to_publish.__setitem__.assert_called_once_with('ovn-configured', False)
        self._get_ovs_value.assert_called_once_with(
            'Open_vSwitch', 'external_ids:ovn-remote')
        to_publish.__setitem__.reset_mock()
        self._get_ovs_value.side_effect = None
        self.target.publish_ovn_configured()
        to_publish.__setitem__.assert_called_once_with('ovn-configured', True)

    def test_interface_requests(self):
        self.patch_target('_all_joined_units')
        self._all_joined_units.received.get.return_value = 'fakereq'
        self.assertEquals(
            self.target.interface_requests, 'fakereq')

    def test_interface_requests_handled(self):
        self.patch_object(provides, 'hash_hexdigest')
        self.hash_hexdigest.return_value = 'fakehash'
        self.patch_target('_all_joined_units')
        self._all_joined_units.received_raw.__getitem__.return_value = 'ifreq'
        to_publish = self.patch_topublish()
        self.patch_object(provides.reactive, 'clear_flag')
        self.target.interface_requests_handled()
        self.hash_hexdigest.assert_called_once_with('ifreq')
        to_publish.__setitem__.assert_called_once_with(
            'interfaces-created', 'fakehash')
        self.clear_flag.assert_called_once_with(
            'some-relation.interfaces.new_requests')

    def test_joined(self):
        self.patch_target('publish_chassis_name')
        self.patch_target('publish_ovn_configured')
        self.patch_object(provides.reactive, 'set_flag')
        self.target.joined()
        self.publish_chassis_name.assert_called_once_with()
        self.publish_ovn_configured.assert_called_once_with()
        self.set_flag.assert_has_calls([
            mock.call('some-relation.connected'),
            mock.call('some-relation.available'),
        ])

    def test_broken(self):
        self.patch_object(provides.reactive, 'clear_flag')
        self.target.broken()
        self.clear_flag.assert_has_calls([
            mock.call('some-relation.available'),
            mock.call('some-relation.connected'),
        ])

    def test_new_requests(self):
        self.patch_object(provides.reactive, 'set_flag')
        self.patch_object(provides.reactive, 'clear_flag')
        self.target.new_requests()
        self.set_flag.assert_called_once_with(
            'some-relation.interfaces.new_requests')
        self.clear_flag.assert_called_once_with(
            'endpoint.some-relation.changed.create-interfaces')

    def test_publish_chassis_certificates(self):
        to_publish = self.patch_topublish()
        self.target.publish_chassis_certificates('a', 'b', 'c')
        to_publish.__setitem__.assert_called_once_with(
            'chassis-certificates', {
                'ca_cert': 'a',
                'certificate': 'b',
                'private_key': 'c',
            })