/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.
 */

package com.hazelcast.client;

import com.hazelcast.client.config.ClientConfig;
import com.hazelcast.client.test.TestHazelcastFactory;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.core.LifecycleEvent;
import com.hazelcast.core.LifecycleListener;
import com.hazelcast.core.Member;
import com.hazelcast.core.MembershipAdapter;
import com.hazelcast.core.MembershipEvent;
import com.hazelcast.nio.Address;
import com.hazelcast.test.AssertTask;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.After;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.Iterator;
import java.util.concurrent.CountDownLatch;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelTest.class})
public class ClientReconnectTest extends HazelcastTestSupport {

    private final TestHazelcastFactory hazelcastFactory = new TestHazelcastFactory();

    @After
    public void cleanup() {
        hazelcastFactory.terminateAll();
    }


    @Test
    public void testClientReconnectOnClusterDown() throws Exception {
        final HazelcastInstance h1 = hazelcastFactory.newHazelcastInstance();
        ClientConfig clientConfig = new ClientConfig();
        clientConfig.getNetworkConfig().setConnectionAttemptLimit(Integer.MAX_VALUE);
        final HazelcastInstance client = hazelcastFactory.newHazelcastClient(clientConfig);
        final CountDownLatch connectedLatch = new CountDownLatch(2);
        client.getLifecycleService().addLifecycleListener(new LifecycleListener() {
            @Override
            public void stateChanged(LifecycleEvent event) {
                connectedLatch.countDown();
            }
        });
        IMap<String, String> m = client.getMap("default");
        h1.shutdown();
        hazelcastFactory.newHazelcastInstance();
        assertOpenEventually(connectedLatch);
        assertNull(m.put("test", "test"));
        assertEquals("test", m.get("test"));
    }

    @Test
    public void testReconnectToNewInstanceAtSameAddress() throws InterruptedException {
        HazelcastInstance instance = hazelcastFactory.newHazelcastInstance();
        Address localAddress = instance.getCluster().getLocalMember().getAddress();
        ClientConfig clientConfig = new ClientConfig();
        clientConfig.getNetworkConfig().setConnectionAttemptLimit(Integer.MAX_VALUE);
        final HazelcastInstance client = hazelcastFactory.newHazelcastClient(clientConfig);

        final CountDownLatch memberRemovedLatch = new CountDownLatch(1);
        client.getCluster().addMembershipListener(new MembershipAdapter() {
            @Override
            public void memberRemoved(MembershipEvent membershipEvent) {
                memberRemovedLatch.countDown();
            }
        });

        instance.shutdown();
        final HazelcastInstance instance2 = hazelcastFactory.newHazelcastInstance(localAddress);

        assertOpenEventually(memberRemovedLatch);

        assertTrueEventually(new AssertTask() {
            @Override
            public void run() throws Exception {
                assertClusterSize(1, client);
                Iterator<Member> iterator = client.getCluster().getMembers().iterator();
                Member member = iterator.next();
                assertEquals(instance2.getCluster().getLocalMember(), member);
            }
        });
    }

    @Test
    public void testClientShutdownIfReconnectionNotPossible() {
        HazelcastInstance server = hazelcastFactory.newHazelcastInstance();
        ClientConfig clientConfig = new ClientConfig();
        clientConfig.getNetworkConfig().setConnectionAttemptLimit(1);
        HazelcastInstance client = hazelcastFactory.newHazelcastClient(clientConfig);

        final CountDownLatch shutdownLatch = new CountDownLatch(1);
        client.getLifecycleService().addLifecycleListener(new LifecycleListener() {
            @Override
            public void stateChanged(LifecycleEvent event) {
                if (event.getState() == LifecycleEvent.LifecycleState.SHUTDOWN) {
                    shutdownLatch.countDown();
                }
            }
        });
        server.shutdown();

        assertOpenEventually(shutdownLatch);
    }

    @Test(expected = HazelcastClientNotActiveException.class, timeout = 30000)
    public void testRequestShouldFailOnShutdown() {
        final HazelcastInstance server = hazelcastFactory.newHazelcastInstance();
        ClientConfig clientConfig = new ClientConfig();
        clientConfig.getNetworkConfig().setConnectionAttemptLimit(1);
        HazelcastInstance client = hazelcastFactory.newHazelcastClient(clientConfig);

        IMap<Object, Object> test = client.getMap("test");
        test.put("key", "value");
        server.shutdown();
        test.get("key");
    }
}