/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

package de.ilias.services.lucene.index;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.sql.SQLException;
import java.util.Vector;

import org.apache.logging.log4j.LogManager;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.store.LockObtainFailedException;

import de.ilias.ilServerStatus;
import de.ilias.services.db.DBFactory;
import de.ilias.services.object.ObjectDefinitionException;
import de.ilias.services.object.ObjectDefinitionParser;
import de.ilias.services.object.ObjectDefinitionReader;
import de.ilias.services.settings.ClientSettings;
import de.ilias.services.settings.ConfigurationException;
import de.ilias.services.settings.LocalSettings;
import de.ilias.services.settings.ServerSettings;
import org.apache.logging.log4j.Logger;

/**
 * 
 *
 * @author Stefan Meyer <smeyer.ilias@gmx.de>
 * @version $Id$
 */
public class RPCIndexHandler {

	protected static Logger logger = LogManager.getLogger(RPCIndexHandler.class);
	
	
	
	/**
	 * Update index for a vector of obj ids
	 * @param clientKey
	 * @param objIds
	 * @return 
	 */
	public boolean indexObjects(String clientKey, Vector<Integer> objIds) {
		
		// Set client key
		LocalSettings.setClientKey(clientKey);
		DBFactory.init();
		ClientSettings client;
		ServerSettings server;
		ObjectDefinitionReader properties;
		ObjectDefinitionParser parser;
		
		CommandController controller;
		
		try {
			long s_start = new java.util.Date().getTime();
			
			logger.info("Checking if indexer is running for client: " + clientKey);
			// Return if indexer is already running for this clientKey
			if(ilServerStatus.isIndexerActive(clientKey)) {
				logger.error("An Indexer is already running for this client. Aborting!");
				return false;
			}
			
			// Set status
			//ilServerStatus.addIndexer(clientKey);

			client = ClientSettings.getInstance(LocalSettings.getClientKey());
			server = ServerSettings.getInstance();
			
			properties = ObjectDefinitionReader.getInstance(client);
			parser = new ObjectDefinitionParser(properties.getObjectPropertyFiles());
			parser.parse();
			
			//controller = CommandController.getInstance();
			controller = new CommandController();
			controller.initObjects(objIds);

			// Start threads
			Vector<CommandControllerThread> threads = new Vector<CommandControllerThread>();
			for(int i = 0; i < server.getNumThreads(); i++) {
				
				CommandControllerThread t = new CommandControllerThread(clientKey,controller);
				t.start();
				threads.add(t);
			}
			// Join threads
			for(int i = 0; i < server.getNumThreads();i++) {
				threads.get(i).join();
			}
			controller.writeToIndex();
			controller.closeIndex();
			
			long s_end = new java.util.Date().getTime();
			logger.info("Index time: " + ((s_end - s_start)/(1000))+ " seconds");
			logger.debug(client.getIndexPath());
			return true;

		} 
		catch (Exception e) {
			logger.error("Unknown error",e);
		}
		finally {
			// Purge resources
			DBFactory.closeAll();
		}
		
		return false;
	}

	/**
	 * Refresh index
	 * @param clientKey
	 * @return
	 */
	public boolean index(String clientKey, boolean incremental) {
		
		Boolean doPurge = true;
		
		// Set client key
		LocalSettings.setClientKey(clientKey);
		DBFactory.init();
		ClientSettings client;
		ServerSettings server;
		ObjectDefinitionReader properties;
		ObjectDefinitionParser parser;
		
		CommandController controller;
		
		try {
			long s_start = new java.util.Date().getTime();
			
			logger.info("Checking if indexer is running for client: " + clientKey);
			// Return if indexer is already running for this clientKey
			if(ilServerStatus.isIndexerActive(clientKey)) {
				logger.error("An Indexer is already running for this client. Aborting!");
				System.err.println("An Indexer is already running for this client. Aborting!");
				doPurge = false;
				return false;
			}
			
			// Set status
			ilServerStatus.addIndexer(clientKey);

			client = ClientSettings.getInstance(LocalSettings.getClientKey());
			server = ServerSettings.getInstance();
			
			if(!incremental) {
				IndexHolder.deleteIndex();
			}
			
			properties = ObjectDefinitionReader.getInstance(client);
			parser = new ObjectDefinitionParser(properties.getObjectPropertyFiles());
			parser.parse();
			
			controller = new CommandController();
			if(incremental) {
				controller.initRefresh();
			}
			else {
				controller.initCreate();
			}
			// Start threads
			Vector<CommandControllerThread> threads = new Vector<CommandControllerThread>();
			for(int i = 0; i < server.getNumThreads(); i++) {
				
				CommandControllerThread t = new CommandControllerThread(clientKey,controller);
				t.start();
				threads.add(t);
			}
			// Join threads
			for(int i = 0; i < server.getNumThreads();i++) {
				threads.get(i).join();
			}
			controller.writeToIndex();
			controller.closeIndex();
			
			long s_end = new java.util.Date().getTime();
			logger.info("Index time: " + ((s_end - s_start)/(1000))+ " seconds");
			logger.debug(client.getIndexPath());
			return true;

		} 
		catch (Exception e) {
			logger.error("Unknown error",e);
		}
		finally {
			// Purge resources
			if(doPurge) {
				ilServerStatus.removeIndexer(clientKey);
				DBFactory.closeAll();
			}
		}
		
		return false;
	}


}