/*
 * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Copyright @ 2015 Atlassian Pty Ltd
 *
 * 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 net.java.sip.communicator.impl.msghistory;

import net.java.sip.communicator.service.contactlist.*;
import net.java.sip.communicator.service.history.*;
import net.java.sip.communicator.service.msghistory.*;
import net.java.sip.communicator.util.*;

import org.jitsi.service.configuration.*;
import org.jitsi.service.resources.*;
import org.osgi.framework.*;

/**
 * Activates the MessageHistoryService
 *
 * @author Damian Minkov
 */
public class MessageHistoryActivator
    implements BundleActivator
{
    /**
     * The <tt>Logger</tt> instance used by the
     * <tt>MessageHistoryActivator</tt> class and its instances for logging
     * output.
     */
    private static Logger logger =
        Logger.getLogger(MessageHistoryActivator.class);

    /**
     * The <tt>MessageHistoryService</tt> reference.
     */
    private static MessageHistoryServiceImpl msgHistoryService = null;

    /**
     * The <tt>ResourceManagementService</tt> reference.
     */
    private static ResourceManagementService resourcesService;

    /**
     * The <tt>MetaContactListService</tt> reference.
     */
    private static MetaContactListService metaCListService;

    /**
     * The <tt>ConfigurationService</tt> reference.
     */
    private static ConfigurationService configService;

    /**
     * The <tt>BundleContext</tt> of the service.
     */
    static BundleContext bundleContext;

    /**
     * Initialize and start message history
     *
     * @param bc the BundleContext
     * @throws Exception if initializing and starting message history service
     * fails
     */
    public void start(BundleContext bc) throws Exception
    {
        bundleContext = bc;
        try
        {
            logger.logEntry();

            ServiceReference refHistory = bundleContext.getServiceReference(
                HistoryService.class.getName());

            HistoryService historyService = (HistoryService)
                bundleContext.getService(refHistory);

            //Create and start the message history service.
            msgHistoryService =
                new MessageHistoryServiceImpl();

            msgHistoryService.setHistoryService(historyService);

            msgHistoryService.start(bundleContext);

            bundleContext.registerService(
                MessageHistoryService.class.getName(), msgHistoryService, null);

            if (logger.isInfoEnabled())
                logger.info("Message History Service ...[REGISTERED]");
        }
        finally
        {
            logger.logExit();
        }

    }

    /**
     * Stops this bundle.
     *
     * @param bundleContext the <tt>BundleContext</tt>
     * @throws Exception if the stop operation goes wrong
     */
    public void stop(BundleContext bundleContext) throws Exception
    {
        if(msgHistoryService != null)
            msgHistoryService.stop(bundleContext);
    }

    /**
     * Returns the <tt>MetaContactListService</tt> obtained from the bundle
     * context.
     * @return the <tt>MetaContactListService</tt> obtained from the bundle
     * context
     */
    public static MetaContactListService getContactListService()
    {
        if (metaCListService == null)
        {
            metaCListService
                = ServiceUtils.getService(
                        bundleContext,
                        MetaContactListService.class);
        }
        return metaCListService;
    }

    /**
     * Returns the <tt>MessageHistoryService</tt> registered to the bundle
     * context.
     * @return the <tt>MessageHistoryService</tt> registered to the bundle
     * context
     */
    public static MessageHistoryServiceImpl getMessageHistoryService()
    {
        return msgHistoryService;
    }

    /**
     * Returns the <tt>ResourceManagementService</tt>, through which we will
     * access all resources.
     *
     * @return the <tt>ResourceManagementService</tt>, through which we will
     * access all resources.
     */
    public static ResourceManagementService getResources()
    {
        if (resourcesService == null)
        {
            resourcesService
                = ServiceUtils.getService(
                bundleContext,
                ResourceManagementService.class);
        }
        return resourcesService;
    }

    /**
     * Returns the <tt>ConfigurationService</tt> obtained from the bundle
     * context.
     * @return the <tt>ConfigurationService</tt> obtained from the bundle
     * context
     */
    public static ConfigurationService getConfigurationService()
    {
        if(configService == null)
        {
            configService
                = ServiceUtils.getService(
                bundleContext,
                ConfigurationService.class);
        }
        return configService;
    }
}