# 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 copy
from unittest import mock

from senlin.policies import batch_policy as bp
from senlin.tests.unit.common import base
from senlin.tests.unit.common import utils


class TestBatchPolicy(base.SenlinTestCase):

    def setUp(self):
        super(TestBatchPolicy, self).setUp()
        self.context = utils.dummy_context()
        self.spec = {
            'type': 'senlin.policy.batch',
            'version': '1.0',
            'properties': {
                'min_in_service': 1,
                'max_batch_size': 2,
                'pause_time': 60,
            }
        }

    def test_policy_init(self):
        policy = bp.BatchPolicy('test-batch', self.spec)

        self.assertIsNone(policy.id)
        self.assertEqual('test-batch', policy.name)
        self.assertEqual('senlin.policy.batch-1.0', policy.type)
        self.assertEqual(1, policy.min_in_service)
        self.assertEqual(2, policy.max_batch_size)
        self.assertEqual(60, policy.pause_time)

    def test_get_batch_size(self):
        policy = bp.BatchPolicy('test-batch', self.spec)

        size = policy._get_batch_size(5)

        self.assertEqual(2, size)

    def test_get_batch_size_less_than_max(self):
        spec = copy.deepcopy(self.spec)
        spec['properties']['max_batch_size'] = 3
        policy = bp.BatchPolicy('test-batch', spec)

        size = policy._get_batch_size(3)

        self.assertEqual(2, size)

    def test_get_batch_size_less_than_min(self):
        spec = copy.deepcopy(self.spec)
        spec['properties']['min_in_service'] = 2
        policy = bp.BatchPolicy('test-batch', spec)

        size = policy._get_batch_size(1)

        self.assertEqual(1, size)

    def test_get_batch_size_with_default_max(self):
        spec = copy.deepcopy(self.spec)
        spec['properties']['max_batch_size'] = -1
        policy = bp.BatchPolicy('test-batch', spec)

        size = policy._get_batch_size(5)
        self.assertEqual(4, size)

    def test_pick_nodes_all_active(self):
        node1 = mock.Mock(id='1', status='ACTIVE')
        node2 = mock.Mock(id='2', status='ACTIVE')
        node3 = mock.Mock(id='3', status='ACTIVE')
        nodes = [node1, node2, node3]
        policy = bp.BatchPolicy('test-batch', self.spec)

        nodes = policy._pick_nodes(nodes, 2)

        self.assertEqual(2, len(nodes))
        self.assertIn(node1.id, nodes[0])
        self.assertIn(node2.id, nodes[0])
        self.assertIn(node3.id, nodes[1])

    def test_pick_nodes_with_error_nodes(self):
        node1 = mock.Mock(id='1', status='ACTIVE', tainted=False)
        node2 = mock.Mock(id='2', status='ACTIVE', tainted=False)
        node3 = mock.Mock(id='3', status='ERROR', tainted=False)
        nodes = [node1, node2, node3]

        policy = bp.BatchPolicy('test-batch', self.spec)

        nodes = policy._pick_nodes(nodes, 2)

        self.assertEqual(2, len(nodes))
        self.assertIn(node3.id, nodes[0])
        self.assertIn(node1.id, nodes[0])
        self.assertIn(node2.id, nodes[1])

    @mock.patch.object(bp.BatchPolicy, '_pick_nodes')
    @mock.patch.object(bp.BatchPolicy, '_get_batch_size')
    def test_create_plan_for_update(self, mock_cal, mock_pick):
        action = mock.Mock(context=self.context, action='CLUSTER_UPDATE')
        cluster = mock.Mock(id='cid')
        node1, node2, node3 = mock.Mock(), mock.Mock(), mock.Mock()
        cluster.nodes = [node1, node2, node3]
        action.entity = cluster

        mock_cal.return_value = 2
        mock_pick.return_value = [{'1', '2'}, {'3'}]
        policy = bp.BatchPolicy('test-batch', self.spec)

        res, plan = policy._create_plan(action)

        self.assertTrue(res)
        excepted_plan = {
            'pause_time': self.spec['properties']['pause_time'],
            'plan': [{'1', '2'}, {'3'}]
        }
        self.assertEqual(excepted_plan, plan)
        mock_cal.assert_called_once_with(3)
        mock_pick.assert_called_once_with([node1, node2, node3], 2)

    def test_create_plan_for_update_no_node(self):
        action = mock.Mock(context=self.context, action='CLUSTER_UPDATE')
        cluster = mock.Mock(id='cid')
        cluster.nodes = []
        action.entity = cluster
        policy = bp.BatchPolicy('test-batch', self.spec)

        res, value = policy._create_plan(action)

        self.assertTrue(res)
        excepted_plan = {
            'pause_time': self.spec['properties']['pause_time'],
            'plan': []
        }
        self.assertEqual(excepted_plan, value)

    @mock.patch.object(bp.BatchPolicy, '_create_plan')
    def test_pre_op_for_update(self, mock_plan):
        action = mock.Mock()
        action.context = self.context
        action.action = 'CLUSTER_UPDATE'
        cluster = mock.Mock(id='cid')
        action.entity = cluster

        excepted_plan = {
            'pause_time': self.spec['properties']['pause_time'],
            'plan': [{'1', '2'}, {'3'}]
        }
        mock_plan.return_value = (True, excepted_plan)

        policy = bp.BatchPolicy('test-batch', self.spec)
        policy.pre_op(cluster.id, action)

        mock_plan.assert_called_once_with(action)

    @mock.patch.object(bp.BatchPolicy, '_create_plan')
    def test_pre_op_for_delete(self, mock_plan):
        action = mock.Mock()
        action.context = self.context
        action.action = 'CLUSTER_DELETE'
        cluster = mock.Mock(id='cid')
        action.entity = cluster

        excepted_plan = {
            'pause_time': self.spec['properties']['pause_time'],
            'batch_size': 2,
        }
        mock_plan.return_value = (True, excepted_plan)

        policy = bp.BatchPolicy('test-batch', self.spec)
        policy.pre_op(cluster.id, action)

        mock_plan.assert_called_once_with(action)