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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.iotdb.db.service;

import com.google.common.collect.Lists;
import io.moquette.BrokerConstants;
import io.moquette.broker.Server;
import io.moquette.broker.config.IConfig;
import io.moquette.broker.config.MemoryConfig;
import io.moquette.broker.security.IAuthenticator;
import io.moquette.interception.InterceptHandler;
import java.util.List;
import java.util.Properties;
import org.apache.iotdb.db.conf.IoTDBConfig;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.exception.StartupException;
import org.apache.iotdb.db.mqtt.BrokerAuthenticator;
import org.apache.iotdb.db.mqtt.PublishHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The IoTDB MQTT Service.
 */
public class MQTTService implements IService {
    private static final Logger LOG = LoggerFactory.getLogger(MQTTService.class);
    private Server server = new Server();
    
    @Override
    public void start() throws StartupException {
        startup();
    }

    @Override
    public void stop() {
        shutdown();
    }

    public void startup() {
        IoTDBConfig iotDBConfig = IoTDBDescriptor.getInstance().getConfig();
        IConfig config = createBrokerConfig(iotDBConfig);
        List handlers = Lists.newArrayList(new PublishHandler(iotDBConfig));
        IAuthenticator authenticator = new BrokerAuthenticator();

        server.startServer(config, handlers, null, authenticator, null);

        LOG.info("Start MQTT service successfully, listening on ip {} port {}",
                iotDBConfig.getMqttHost(), iotDBConfig.getMqttPort());

        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
            LOG.info("Stopping IoTDB MQTT service...");
            shutdown();
            LOG.info("IoTDB MQTT service stopped.");
        }));
    }

    private IConfig createBrokerConfig(IoTDBConfig iotDBConfig) {
        Properties properties = new Properties();
        properties.setProperty(BrokerConstants.HOST_PROPERTY_NAME, iotDBConfig.getMqttHost());
        properties.setProperty(BrokerConstants.PORT_PROPERTY_NAME, String.valueOf(iotDBConfig.getMqttPort()));
        properties.setProperty(BrokerConstants.BROKER_INTERCEPTOR_THREAD_POOL_SIZE, String.valueOf(iotDBConfig.getMqttHandlerPoolSize()));
        properties.setProperty(BrokerConstants.IMMEDIATE_BUFFER_FLUSH_PROPERTY_NAME, "true");
        properties.setProperty(BrokerConstants.ALLOW_ANONYMOUS_PROPERTY_NAME, "false");
        properties.setProperty(BrokerConstants.ALLOW_ZERO_BYTE_CLIENT_ID_PROPERTY_NAME, "true");
        properties.setProperty(BrokerConstants.NETTY_MAX_BYTES_PROPERTY_NAME, String.valueOf(iotDBConfig.getMqttMaxMessageSize()));
        return new MemoryConfig(properties);
    }

    public void shutdown() {
        server.stopServer();
    }

    @Override
    public ServiceType getID() {
        return ServiceType.MQTT_SERVICE;
    }

    public static final MQTTService getInstance() {
        return MQTTServiceHolder.INSTANCE;
    }

    private static class MQTTServiceHolder {

        private static final MQTTService INSTANCE = new MQTTService();

        private MQTTServiceHolder() {
        }
    }
}