/**
 * $Revision: 3034 $
 * $Date: 2005-11-04 21:02:33 -0300 (Fri, 04 Nov 2005) $
 *
 * Copyright (C) 2008 Jive Software. 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 org.jivesoftware.openfire.plugin;

import java.io.File;
import java.io.FileFilter;

import org.jivesoftware.openfire.XMPPServer;
import org.jivesoftware.openfire.archive.ArchiveIndexer;
import org.jivesoftware.openfire.archive.ArchiveInterceptor;
import org.jivesoftware.openfire.archive.ArchiveSearcher;
import org.jivesoftware.openfire.archive.ConversationManager;
import org.jivesoftware.openfire.archive.GroupConversationInterceptor;
import org.jivesoftware.openfire.archive.MonitoringConstants;
import org.jivesoftware.openfire.container.Plugin;
import org.jivesoftware.openfire.container.PluginManager;
import org.jivesoftware.openfire.reporting.graph.GraphEngine;
import org.jivesoftware.openfire.reporting.stats.DefaultStatsViewer;
import org.jivesoftware.openfire.reporting.stats.MockStatsViewer;
import org.jivesoftware.openfire.reporting.stats.StatisticsModule;
import org.jivesoftware.openfire.reporting.stats.StatsEngine;
import org.jivesoftware.openfire.reporting.stats.StatsViewer;
import org.jivesoftware.openfire.reporting.util.TaskEngine;
import org.jivesoftware.util.JiveGlobals;
import org.jivesoftware.util.JiveProperties;
import org.picocontainer.MutablePicoContainer;
import org.picocontainer.defaults.DefaultPicoContainer;

import com.reucon.openfire.plugin.archive.ArchiveManager;
import com.reucon.openfire.plugin.archive.ArchiveProperties;
import com.reucon.openfire.plugin.archive.IndexManager;
import com.reucon.openfire.plugin.archive.PersistenceManager;
import com.reucon.openfire.plugin.archive.impl.ArchiveManagerImpl;
import com.reucon.openfire.plugin.archive.impl.JdbcPersistenceManager;
import com.reucon.openfire.plugin.archive.xep0136.Xep0136Support;

/**
 * Openfire Monitoring plugin.
 * 
 * @author Matt Tucker
 */
public class MonitoringPlugin implements Plugin {

	private static final int DEFAULT_CONVERSATION_TIMEOUT = 30; // minutes

	private MutablePicoContainer picoContainer;

	private boolean shuttingDown = false;

	private int conversationTimeout;
	private static MonitoringPlugin instance;
	private boolean enabled = true;
	private PersistenceManager persistenceManager;
	private ArchiveManager archiveManager;
	private IndexManager indexManager;
	private Xep0136Support xep0136Support;

	public MonitoringPlugin() {
		instance = this;

		// Enable AWT headless mode so that stats will work in headless
		// environments.
		System.setProperty("java.awt.headless", "true");

		picoContainer = new DefaultPicoContainer();
		picoContainer.registerComponentInstance(TaskEngine.getInstance());
		picoContainer.registerComponentInstance(JiveProperties.getInstance());

		// Stats and Graphing classes
		picoContainer.registerComponentImplementation(StatsEngine.class);
		picoContainer.registerComponentImplementation(GraphEngine.class);
		picoContainer.registerComponentImplementation(StatisticsModule.class);
		picoContainer.registerComponentImplementation(StatsViewer.class,
				getStatsViewerImplementation());

		// Archive classes
		picoContainer
				.registerComponentImplementation(ConversationManager.class);
		picoContainer.registerComponentImplementation(ArchiveInterceptor.class);
		picoContainer
				.registerComponentImplementation(GroupConversationInterceptor.class);
		picoContainer.registerComponentImplementation(ArchiveSearcher.class);
		picoContainer.registerComponentImplementation(ArchiveIndexer.class);
	}

	private Class<? extends StatsViewer> getStatsViewerImplementation() {
		if (JiveGlobals.getBooleanProperty("stats.mock.viewer", false)) {
			return MockStatsViewer.class;
		} else {
			return DefaultStatsViewer.class;
		}
	}

	public static MonitoringPlugin getInstance() {
		return instance;
	}

	/* enabled property */
	public boolean isEnabled() {
		return this.enabled;
	}

	public ArchiveManager getArchiveManager() {
		return archiveManager;
	}

	public IndexManager getIndexManager() {
		return indexManager;
	}

	public PersistenceManager getPersistenceManager() {
		return persistenceManager;
	}

	/**
	 * Returns the instance of a module registered with the Monitoring plugin.
	 * 
	 * @param clazz
	 *            the module class.
	 * @return the instance of the module.
	 */
	public Object getModule(Class<?> clazz) {
		return picoContainer.getComponentInstanceOfType(clazz);
	}

	public void initializePlugin(PluginManager manager, File pluginDirectory) {

		/* Configuration */
		conversationTimeout = JiveGlobals.getIntProperty(
				ArchiveProperties.CONVERSATION_TIMEOUT,
				DEFAULT_CONVERSATION_TIMEOUT);
		enabled = JiveGlobals.getBooleanProperty(ArchiveProperties.ENABLED,
				false);

		persistenceManager = new JdbcPersistenceManager();

		archiveManager = new ArchiveManagerImpl(persistenceManager,
				indexManager, conversationTimeout);

		xep0136Support = new Xep0136Support(XMPPServer.getInstance());
		xep0136Support.start();

		System.out.println("Starting Monitoring Plugin");

		// Check if we Enterprise is installed and stop loading this plugin if
		// found
		File pluginDir = new File(JiveGlobals.getHomeDirectory(), "plugins");
		File[] jars = pluginDir.listFiles(new FileFilter() {
			public boolean accept(File pathname) {
				String fileName = pathname.getName().toLowerCase();
				return (fileName.equalsIgnoreCase("enterprise.jar"));
			}
		});
		if (jars.length > 0) {
			// Do not load this plugin since Enterprise is still installed
			System.out
					.println("Enterprise plugin found. Stopping Monitoring Plugin");
			throw new IllegalStateException(
					"This plugin cannot run next to the Enterprise plugin");
		}

		shuttingDown = false;

		// Make sure that the monitoring folder exists under the home directory
		File dir = new File(JiveGlobals.getHomeDirectory() + File.separator
				+ MonitoringConstants.NAME);
		if (!dir.exists()) {
			dir.mkdirs();
		}

		picoContainer.start();

		xep0136Support = new Xep0136Support(XMPPServer.getInstance());
		xep0136Support.start();
	}

	public void destroyPlugin() {
		shuttingDown = true;

		if (picoContainer != null) {
			picoContainer.stop();
			picoContainer.dispose();
			picoContainer = null;
		}
		instance = null;
	}

	public boolean isShuttingDown() {
		return shuttingDown;
	}
}