/*
 * 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.jackrabbit.oak.segment.standby;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.File;
import java.lang.management.ManagementFactory;
import java.util.Set;

import javax.management.MBeanServer;
import javax.management.ObjectName;

import org.apache.jackrabbit.oak.commons.junit.TemporaryPort;
import org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSync;
import org.apache.jackrabbit.oak.segment.standby.jmx.StandbyStatusMBean;
import org.apache.jackrabbit.oak.segment.standby.server.StandbyServerSync;
import org.apache.jackrabbit.oak.segment.test.TemporaryFileStore;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.RuleChain;
import org.junit.rules.TemporaryFolder;

public class MBeanIT extends TestBase {

    private TemporaryFolder folder = new TemporaryFolder(new File("target"));

    private TemporaryFileStore serverFileStore = new TemporaryFileStore(folder, false);

    private TemporaryFileStore clientFileStore = new TemporaryFileStore(folder, true);

    @Rule
    public TemporaryPort serverPort = new TemporaryPort();

    @Rule
    public RuleChain chain = RuleChain.outerRule(folder)
            .around(serverFileStore)
            .around(clientFileStore);

    @Test
    public void testServerEmptyConfig() throws Exception {
        MBeanServer jmxServer = ManagementFactory.getPlatformMBeanServer();
        ObjectName status = new ObjectName(StandbyStatusMBean.JMX_NAME + ",id=*");
        try (
            StandbyServerSync serverSync = StandbyServerSync.builder()
                .withPort(serverPort.getPort())
                .withFileStore(serverFileStore.fileStore())
                .withBlobChunkSize(1 * MB)
                .build()
        ) {
            serverSync.start();

            Set<ObjectName> instances = jmxServer.queryNames(status, null);
            assertEquals(1, instances.size());
            status = instances.toArray(new ObjectName[0])[0];
            assertEquals(new ObjectName(serverSync.getMBeanName()), status);
            assertTrue(jmxServer.isRegistered(status));

            assertEquals("primary", jmxServer.getAttribute(status, "Mode"));
            String m = jmxServer.getAttribute(status, "Status").toString();
            if (!m.equals(StandbyStatusMBean.STATUS_RUNNING) && !m.equals("channel unregistered")) {
                fail("unexpected Status " + m);
            }

            assertEquals(StandbyStatusMBean.STATUS_RUNNING, jmxServer.getAttribute(status, "Status"));
            assertEquals(true, jmxServer.getAttribute(status, "Running"));
            jmxServer.invoke(status, "stop", null, null);
            assertEquals(false, jmxServer.getAttribute(status, "Running"));
            assertEquals(StandbyStatusMBean.STATUS_STOPPED, jmxServer.getAttribute(status, "Status"));
            jmxServer.invoke(status, "start", null, null);

            assertEquals(true, jmxServer.getAttribute(status, "Running"));
            assertEquals(StandbyStatusMBean.STATUS_RUNNING, jmxServer.getAttribute(status, "Status"));
        }
        assertTrue(!jmxServer.isRegistered(status));
    }

    @Test
    public void testClientEmptyConfigNoServer() throws Exception {
        MBeanServer jmxServer = ManagementFactory.getPlatformMBeanServer();
        ObjectName status = new ObjectName(StandbyStatusMBean.JMX_NAME + ",id=*");
        try (StandbyClientSync clientSync = new StandbyClientSync(getServerHost(), serverPort.getPort(), clientFileStore.fileStore(), false, getClientTimeout(), false, folder.newFolder())) {
            clientSync.start();
            clientSync.run();

            Set<ObjectName> instances = jmxServer.queryNames(status, null);
            assertEquals(1, instances.size());
            status = instances.toArray(new ObjectName[0])[0];
            assertEquals(new ObjectName(clientSync.getMBeanName()), status);
            assertTrue(jmxServer.isRegistered(status));

            String m = jmxServer.getAttribute(status, "Mode").toString();
            if (!m.startsWith("client: ")) {
                fail("unexpected mode " + m);
            }

            assertEquals("1", jmxServer.getAttribute(status, "FailedRequests").toString());
            assertEquals("-1", jmxServer.getAttribute(status, "SecondsSinceLastSuccess").toString());

            assertEquals(StandbyStatusMBean.STATUS_RUNNING, jmxServer.getAttribute(status, "Status"));

            assertEquals(true, jmxServer.getAttribute(status, "Running"));
            jmxServer.invoke(status, "stop", null, null);
            assertEquals(false, jmxServer.getAttribute(status, "Running"));
            assertEquals(StandbyStatusMBean.STATUS_STOPPED, jmxServer.getAttribute(status, "Status"));
            jmxServer.invoke(status, "start", null, null);
            assertEquals(true, jmxServer.getAttribute(status, "Running"));
            assertEquals(StandbyStatusMBean.STATUS_RUNNING, jmxServer.getAttribute(status, "Status"));

        }
        assertTrue(!jmxServer.isRegistered(status));
    }

    @Test
    public void testClientNoServer() throws Exception {
        System.setProperty(StandbyClientSync.CLIENT_ID_PROPERTY_NAME, "Foo");
        MBeanServer jmxServer = ManagementFactory.getPlatformMBeanServer();
        ObjectName status;
        try (StandbyClientSync clientSync = new StandbyClientSync(getServerHost(), serverPort.getPort(), clientFileStore.fileStore(), false, getClientTimeout(), false, folder.newFolder())) {
            clientSync.start();
            clientSync.run();

            status = new ObjectName(clientSync.getMBeanName());
            assertTrue(jmxServer.isRegistered(status));
            assertEquals("client: Foo", jmxServer.getAttribute(status, "Mode"));

            assertEquals("1", jmxServer.getAttribute(status, "FailedRequests").toString());
            assertEquals("-1", jmxServer.getAttribute(status, "SecondsSinceLastSuccess").toString());

            assertEquals("1", jmxServer.invoke(status, "calcFailedRequests", null, null).toString());
            assertEquals("-1", jmxServer.invoke(status, "calcSecondsSinceLastSuccess", null, null).toString());
        }
        assertTrue(!jmxServer.isRegistered(status));
    }

    @Test
    public void testClientAndServerEmptyConfig() throws Exception {
        System.setProperty(StandbyClientSync.CLIENT_ID_PROPERTY_NAME, "Bar");
        MBeanServer jmxServer = ManagementFactory.getPlatformMBeanServer();
        ObjectName clientStatus, serverStatus;
        try (
            StandbyServerSync serverSync = StandbyServerSync.builder()
                .withPort(serverPort.getPort())
                .withFileStore(serverFileStore.fileStore())
                .withBlobChunkSize(MB)
                .build();
            StandbyClientSync clientSync = new StandbyClientSync(getServerHost(), serverPort.getPort(), clientFileStore.fileStore(), false, getClientTimeout(), false, folder.newFolder())
        ) {
            serverSync.start();
            serverFileStore.fileStore().flush();

            clientSync.start();
            clientSync.run();

            clientStatus = new ObjectName(clientSync.getMBeanName());
            serverStatus = new ObjectName(serverSync.getMBeanName());
            ObjectName status = new ObjectName(StandbyStatusMBean.JMX_NAME + ",id=*");
            Set<ObjectName> instances = jmxServer.queryNames(status, null);
            assertEquals(3, instances.size());

            ObjectName connectionStatus = null;
            for (ObjectName s : instances) {
                if (!s.equals(clientStatus) && !s.equals(serverStatus)) {
                    connectionStatus = s;
                }
            }
            assertNotNull(connectionStatus);

            assertTrue(jmxServer.isRegistered(clientStatus));
            assertTrue(jmxServer.isRegistered(serverStatus));
            assertTrue(jmxServer.isRegistered(connectionStatus));

            String m = jmxServer.getAttribute(clientStatus, "Mode").toString();
            if (!m.startsWith("client: ")) {
                fail("unexpected mode " + m);
            }

            assertEquals("primary", jmxServer.getAttribute(serverStatus, "Mode"));

            assertEquals(true, jmxServer.getAttribute(serverStatus, "Running"));
            assertEquals(true, jmxServer.getAttribute(clientStatus, "Running"));

            assertEquals("0", jmxServer.getAttribute(clientStatus, "FailedRequests").toString());
            assertEquals("0", jmxServer.getAttribute(clientStatus, "SecondsSinceLastSuccess").toString());
            assertEquals("0", jmxServer.invoke(clientStatus, "calcFailedRequests", null, null).toString());
            assertEquals("0", jmxServer.invoke(clientStatus, "calcSecondsSinceLastSuccess", null, null).toString());

            Thread.sleep(1000);

            assertEquals("0", jmxServer.getAttribute(clientStatus, "FailedRequests").toString());
            assertEquals("1", jmxServer.getAttribute(clientStatus, "SecondsSinceLastSuccess").toString());
            assertEquals("0", jmxServer.invoke(clientStatus, "calcFailedRequests", null, null).toString());
            assertEquals("1", jmxServer.invoke(clientStatus, "calcSecondsSinceLastSuccess", null, null).toString());

            assertEquals(1L, jmxServer.getAttribute(connectionStatus, "TransferredSegments"));

            // stop the master
            jmxServer.invoke(serverStatus, "stop", null, null);
            assertEquals(false, jmxServer.getAttribute(serverStatus, "Running"));
            m = jmxServer.getAttribute(serverStatus, "Status").toString();
            if (!m.equals(StandbyStatusMBean.STATUS_STOPPED) && !m.equals("channel unregistered")) {
                fail("unexpected Status" + m);
            }

            // restart the master
            jmxServer.invoke(serverStatus, "start", null, null);
            assertEquals(true, jmxServer.getAttribute(serverStatus, "Running"));
            assertEquals(true, jmxServer.getAttribute(clientStatus, "Running"));
            m = jmxServer.getAttribute(serverStatus, "Status").toString();
            if (!m.equals(StandbyStatusMBean.STATUS_RUNNING) && !m.equals("channel unregistered")) {
                fail("unexpected Status" + m);
            }

            // stop the slave
            jmxServer.invoke(clientStatus, "stop", null, null);
            assertEquals(true, jmxServer.getAttribute(serverStatus, "Running"));
            assertEquals(false, jmxServer.getAttribute(clientStatus, "Running"));
            assertEquals(StandbyStatusMBean.STATUS_STOPPED, jmxServer.getAttribute(clientStatus, "Status"));

            // restart the slave
            jmxServer.invoke(clientStatus, "start", null, null);
            assertEquals(true, jmxServer.getAttribute(clientStatus, "Running"));
            assertEquals(StandbyStatusMBean.STATUS_RUNNING, jmxServer.getAttribute(clientStatus, "Status"));
        }
        assertTrue(!jmxServer.isRegistered(clientStatus));
        assertTrue(!jmxServer.isRegistered(serverStatus));
    }

}
