/*
 *
 * 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.qpid.test.utils;

import java.io.File;
import java.security.PrivilegedAction;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

import javax.security.auth.Subject;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.qpid.server.SystemLauncher;
import org.apache.qpid.server.SystemLauncherListener;
import org.apache.qpid.server.logging.logback.LogbackLoggingSystemLauncherListener;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.model.IllegalStateTransitionException;
import org.apache.qpid.server.model.SystemConfig;
import org.apache.qpid.server.security.auth.TaskPrincipal;

public class InternalBrokerHolder extends AbstractBrokerHolder
{
    private final static Logger LOGGER = LoggerFactory.getLogger(InternalBrokerHolder.class);
    private final static UncaughtExceptionHandler UNCAUGHT_EXCEPTION_HANDLER = new UncaughtExceptionHandler();

    private volatile SystemLauncher _systemLauncher;

    public InternalBrokerHolder(int port, final String classQualifiedTestName, final File logFile)
    {
        super(port, classQualifiedTestName, logFile);
    }


    @Override
    protected void start(final boolean managementMode, final int amqpPort) throws Exception
    {

        Map<String,String> context = new HashMap<>();
        context.put("test.hport", String.valueOf(getHttpPort()));
        context.put("qpid.home_dir", System.getProperty("QPID_HOME"));
        context.put("qpid.work_dir", getWorkDir().toString());

        context.put("test.port", String.valueOf(amqpPort));

        Map<String,Object> attributes = new HashMap<>();

        attributes.put(ConfiguredObject.CONTEXT, context);
        attributes.put(ConfiguredObject.TYPE, getBrokerStoreType());
        attributes.put("storePath", getConfigurationPath());

        attributes.put(SystemConfig.MANAGEMENT_MODE, managementMode);

        if(managementMode)
        {
            attributes.put(SystemConfig.MANAGEMENT_MODE_PASSWORD, QpidBrokerTestCase.MANAGEMENT_MODE_PASSWORD);
        }

        start(attributes);

    }

    public void start(final Map<String,Object> systemConfig) throws Exception
    {
        if (Thread.getDefaultUncaughtExceptionHandler() == null)
        {
            Thread.setDefaultUncaughtExceptionHandler(UNCAUGHT_EXCEPTION_HANDLER);
        }

        LOGGER.info("Starting internal broker (same JVM)");

        _systemLauncher = new SystemLauncher(new LogbackLoggingSystemLauncherListener(),
                                             new SystemLauncherListener.DefaultSystemLauncherListener()
                                             {
                                                 @Override
                                                 public void onShutdown(final int exitCode)
                                                 {
                                                     _systemLauncher = null;
                                                 }

                                                 @Override
                                                 public void exceptionOnShutdown(final Exception e)
                                                 {
                                                     if (e instanceof IllegalStateException
                                                         || e instanceof IllegalStateTransitionException)
                                                     {
                                                         System.out.println(
                                                                 "IllegalStateException occurred on broker shutdown in test "
                                                                 + getClassQualifiedTestName());
                                                     }
                                                 }
                                             });

        _systemLauncher.startup(systemConfig);
    }

    @Override
    public void shutdown()
    {
        if (_systemLauncher != null)
        {
            LOGGER.info("Shutting down Broker instance");
            Subject shutdownSubject = new Subject(true,
                                                  new HashSet<>(Arrays.asList(_systemLauncher.getSystemPrincipal(), new TaskPrincipal("Shutdown"))),
                                                  Collections.emptySet(),
                                                  Collections.emptySet());
            Subject.doAs(shutdownSubject, new PrivilegedAction<Object>()
            {
                @Override
                public Object run()
                {
                    if (_systemLauncher != null)
                    {
                        _systemLauncher.shutdown();
                    }
                    return null;
                }
            });
            waitUntilPortsAreFreeIfRequired();
            LOGGER.info("Broker instance shutdown");
        }
        else
        {
            LOGGER.info("Nothing to shutdown. Broker instance either was already shut down or not started at all.");
        }

        if (UNCAUGHT_EXCEPTION_HANDLER.getAndResetCount() > 0)
        {
            throw new RuntimeException(
                    "One or more uncaught exceptions occurred prior to end of this test. Check test logs.");
        }
    }

    @Override
    public void kill()
    {
        // Can't kill a internal broker as we would also kill ourselves as we share the same JVM.
        shutdown();
    }

    @Override
    public String dumpThreads()
    {
        return TestUtils.dumpThreads();
    }

    @Override
    public String toString()
    {
        return "InternalBrokerHolder [amqpPort=" + getAmqpPort() + "]";
    }

    @Override
    protected String getLogPrefix()
    {
        return null;
    }

    private static class UncaughtExceptionHandler implements Thread.UncaughtExceptionHandler
    {
        private final AtomicInteger _count = new AtomicInteger(0);

        @Override
        public void uncaughtException(final Thread t, final Throwable e)
        {
            System.err.print("Thread terminated due to uncaught exception");
            e.printStackTrace();

            LOGGER.error("Uncaught exception from thread {}", t.getName(), e);
            _count.getAndIncrement();
        }

        public int getAndResetCount()
        {
            int count;
            do
            {
                count = _count.get();
            }
            while (!_count.compareAndSet(count, 0));
            return count;
        }
    }
}