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   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  package org.apache.ambari.server.checks;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Clusters;
  import org.apache.ambari.server.state.Host;
  import org.apache.ambari.server.state.MaintenanceState;
  import org.apache.ambari.server.state.StackId;
  import org.apache.ambari.spi.ClusterInformation;
  import org.apache.ambari.spi.upgrade.UpgradeCheckRequest;
  import org.apache.ambari.spi.upgrade.UpgradeCheckResult;
  import org.apache.ambari.spi.upgrade.UpgradeCheckStatus;
  import org.apache.ambari.spi.upgrade.UpgradeType;
  import org.junit.Assert;
  import org.junit.Test;
  import org.mockito.Mockito;
  
  import com.google.inject.Provider;
  
  /**
   * Tests {@link HostMaintenanceModeCheck}.
   */
  public class HostMaintenanceModeCheckTest {
    private final Clusters clusters = Mockito.mock(Clusters.class);
  
    /**
     * @throws Exception
     */
    @Test
    public void testPerform() throws Exception {
      final HostMaintenanceModeCheck hostMaintenanceModeCheck = new HostMaintenanceModeCheck();
      hostMaintenanceModeCheck.clustersProvider = new Provider<Clusters>() {
  
        @Override
        public Clusters get() {
          return clusters;
        }
      };
  
      final Cluster cluster = Mockito.mock(Cluster.class);
      Mockito.when(cluster.getClusterId()).thenReturn(1L);
      Mockito.when(cluster.getCurrentStackVersion()).thenReturn(new StackId("HDP", "2.2"));
      Mockito.when(clusters.getCluster("cluster")).thenReturn(cluster);
  
      final List<Host> hosts = new ArrayList<>();
      final Host host1 = Mockito.mock(Host.class);
      final Host host2 = Mockito.mock(Host.class);
      final Host host3 = Mockito.mock(Host.class);
  
      Mockito.when(host1.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host2.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
  
      hosts.add(host1);
      hosts.add(host2);
      hosts.add(host3);
  
      Mockito.when(cluster.getHosts()).thenReturn(hosts);
  
      ClusterInformation clusterInformation = new ClusterInformation("cluster", false, null, null, null);
      UpgradeCheckRequest request = new UpgradeCheckRequest(clusterInformation, UpgradeType.ROLLING, null, null, null);
  
      UpgradeCheckResult check = hostMaintenanceModeCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.PASS, check.getStatus());
  
      // put a host into MM in order to trigger the warning
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.ON);
      check = hostMaintenanceModeCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.WARNING, check.getStatus());
    }
  
    @Test
    public void testPerformHostOrdered() throws Exception {
      final HostMaintenanceModeCheck hostMaintenanceModeCheck = new HostMaintenanceModeCheck();
      hostMaintenanceModeCheck.clustersProvider = new Provider<Clusters>() {
  
        @Override
        public Clusters get() {
          return clusters;
        }
      };
  
      final Cluster cluster = Mockito.mock(Cluster.class);
      Mockito.when(cluster.getClusterId()).thenReturn(1L);
      Mockito.when(cluster.getCurrentStackVersion()).thenReturn(new StackId("HDP", "2.2"));
      Mockito.when(clusters.getCluster("cluster")).thenReturn(cluster);
  
      final List<Host> hosts = new ArrayList<>();
      final Host host1 = Mockito.mock(Host.class);
      final Host host2 = Mockito.mock(Host.class);
      final Host host3 = Mockito.mock(Host.class);
  
      Mockito.when(host1.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host2.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host1.getHostName()).thenReturn("h1");
      Mockito.when(host2.getHostName()).thenReturn("h2");
      Mockito.when(host3.getHostName()).thenReturn("h3");
  
      hosts.add(host1);
      hosts.add(host2);
      hosts.add(host3);
  
      Mockito.when(cluster.getHosts()).thenReturn(hosts);
  
      ClusterInformation clusterInformation = new ClusterInformation("cluster", false, null, null, null);
      UpgradeCheckRequest request = new UpgradeCheckRequest(clusterInformation, UpgradeType.ROLLING, null, null, null);
  
      UpgradeCheckResult check = hostMaintenanceModeCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.PASS, check.getStatus());
      Assert.assertTrue(check.getFailedDetail().isEmpty());
  
      // put a host into MM in order to trigger the warning
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.ON);
  
      request = new UpgradeCheckRequest(clusterInformation, UpgradeType.HOST_ORDERED, null, null, null);
      check = hostMaintenanceModeCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.FAIL, check.getStatus());
      Assert.assertFalse(check.getFailedDetail().isEmpty());
      Assert.assertEquals("The following hosts cannot be in Maintenance Mode: h3.", check.getFailReason());
    }
  }
  