/*
 * 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.shardingsphere.elasticjob.lite.internal.listener;

import org.apache.curator.framework.state.ConnectionState;
import org.apache.shardingsphere.elasticjob.infra.handler.sharding.JobInstance;
import org.apache.shardingsphere.elasticjob.lite.internal.instance.InstanceService;
import org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobRegistry;
import org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobScheduleController;
import org.apache.shardingsphere.elasticjob.lite.internal.server.ServerService;
import org.apache.shardingsphere.elasticjob.lite.internal.sharding.ExecutionService;
import org.apache.shardingsphere.elasticjob.lite.internal.sharding.ShardingService;
import org.apache.shardingsphere.elasticjob.reg.base.CoordinatorRegistryCenter;
import org.apache.shardingsphere.elasticjob.lite.util.ReflectionUtils;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;

import java.util.Arrays;

import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@RunWith(MockitoJUnitRunner.class)
public final class RegistryCenterConnectionStateListenerTest {
    
    @Mock
    private CoordinatorRegistryCenter regCenter;
    
    @Mock
    private ServerService serverService;
    
    @Mock
    private InstanceService instanceService;
    
    @Mock
    private ShardingService shardingService;
    
    @Mock
    private ExecutionService executionService;
    
    @Mock
    private JobScheduleController jobScheduleController;
    
    private RegistryCenterConnectionStateListener regCenterConnectionStateListener;
    
    @Before
    public void setUp() {
        JobRegistry.getInstance().addJobInstance("test_job", new JobInstance("127.0.0.1@-@0"));
        regCenterConnectionStateListener = new RegistryCenterConnectionStateListener(null, "test_job");
        ReflectionUtils.setFieldValue(regCenterConnectionStateListener, "serverService", serverService);
        ReflectionUtils.setFieldValue(regCenterConnectionStateListener, "instanceService", instanceService);
        ReflectionUtils.setFieldValue(regCenterConnectionStateListener, "shardingService", shardingService);
        ReflectionUtils.setFieldValue(regCenterConnectionStateListener, "executionService", executionService);
    }
    
    @Test
    public void assertConnectionLostListenerWhenConnectionStateIsLost() {
        JobRegistry.getInstance().registerRegistryCenter("test_job", regCenter);
        JobRegistry.getInstance().registerJob("test_job", jobScheduleController);
        regCenterConnectionStateListener.stateChanged(null, ConnectionState.LOST);
        verify(jobScheduleController).pauseJob();
        JobRegistry.getInstance().shutdown("test_job");
    }
    
    @Test
    public void assertConnectionLostListenerWhenConnectionStateIsLostButIsShutdown() {
        regCenterConnectionStateListener.stateChanged(null, ConnectionState.LOST);
        verify(jobScheduleController, times(0)).pauseJob();
        verify(jobScheduleController, times(0)).resumeJob();
    }
    
    @Test
    public void assertConnectionLostListenerWhenConnectionStateIsReconnected() {
        JobRegistry.getInstance().registerRegistryCenter("test_job", regCenter);
        JobRegistry.getInstance().registerJob("test_job", jobScheduleController);
        when(shardingService.getLocalShardingItems()).thenReturn(Arrays.asList(0, 1));
        when(serverService.isEnableServer("127.0.0.1")).thenReturn(true);
        regCenterConnectionStateListener.stateChanged(null, ConnectionState.RECONNECTED);
        verify(serverService).persistOnline(true);
        verify(executionService).clearRunningInfo(Arrays.asList(0, 1));
        verify(jobScheduleController).resumeJob();
        JobRegistry.getInstance().shutdown("test_job");
    }
    
    @Test
    public void assertConnectionLostListenerWhenConnectionStateIsReconnectedButIsShutdown() {
        regCenterConnectionStateListener.stateChanged(null, ConnectionState.RECONNECTED);
        verify(jobScheduleController, times(0)).pauseJob();
        verify(jobScheduleController, times(0)).resumeJob();
    }
    
    @Test
    public void assertConnectionLostListenerWhenConnectionStateIsOther() {
        JobRegistry.getInstance().registerRegistryCenter("test_job", regCenter);
        JobRegistry.getInstance().registerJob("test_job", jobScheduleController);
        regCenterConnectionStateListener.stateChanged(null, ConnectionState.CONNECTED);
        verify(jobScheduleController, times(0)).pauseJob();
        verify(jobScheduleController, times(0)).resumeJob();
        JobRegistry.getInstance().shutdown("test_job");
    }
}
