/*
 * Created on 16-Jun-2004
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * 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 com.aelitis.azureus.plugins.upnp;

/**
 * @author parg
 *
 */

import java.util.*;

import org.gudy.azureus2.core3.config.*;
import org.gudy.azureus2.core3.util.AERunnable;
import org.gudy.azureus2.core3.util.AsyncDispatcher;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.RandomUtils;
import org.gudy.azureus2.plugins.logging.LoggerChannel;

import com.aelitis.azureus.core.util.CopyOnWriteList;
import com.aelitis.net.upnp.services.UPnPWANConnection;

public class 
UPnPMappingManager 
{
	private static UPnPMappingManager	singleton;
	
	protected static synchronized UPnPMappingManager
	getSingleton(
		UPnPPlugin	plugin )
	{
		if ( singleton == null ){
			
			singleton = new UPnPMappingManager( plugin );
		}
		
		return( singleton );
	}
	
	private UPnPPlugin	plugin;
	
	private List<UPnPMapping>	mappings	= new ArrayList<UPnPMapping>();
	
	private CopyOnWriteList<UPnPMappingManagerListener>			listeners	= new CopyOnWriteList<UPnPMappingManagerListener>();
	
	private AsyncDispatcher	async_dispatcher = new AsyncDispatcher();
	
	protected
	UPnPMappingManager(
		UPnPPlugin		_plugin )
	{
		plugin	= _plugin;
		
			// incoming data port

			// Zyxel routers currently seem to overwrite the TCP mapping for a given port
			// with the UDP one, leaving the TCP one non-operational. Hack to try setting them
			// in UDP -> TCP order to hopefully leave the more important one working :)
		
		addConfigPort( "upnp.mapping.dataport", false, "UDP.Listen.Port.Enable", "UDP.Listen.Port" );
		
			// this is actually the UDP tracker client mapping, very badly named params...
		
		addConfigPort( "upnp.mapping.trackerclientudp", false, "Server Enable UDP", "UDP.NonData.Listen.Port" );

			// note that the dht plugin registers its own mapping
		
		
		addConfigPort( "upnp.mapping.dataport", true, "TCP.Listen.Port.Enable", "TCP.Listen.Port" );

		addConfigPort( "upnp.mapping.dataport", true, "HTTP.Data.Listen.Port.Enable", "HTTP.Data.Listen.Port" );

			// tracker server TCP
		
		addConfigPort( "upnp.mapping.tcptrackerport", true, "Tracker Port Enable", "Tracker Port" );
		
		addConfigPortX( "upnp.mapping.tcptrackerport", true, "Tracker Port Enable", "Tracker Port Backups" );
		
		addConfigPort( "upnp.mapping.tcpssltrackerport", true, "Tracker Port SSL Enable", "Tracker Port SSL" );
		
		addConfigPortX( "upnp.mapping.tcpssltrackerport", true, "Tracker Port SSL Enable", "Tracker Port SSL Backups" );
		
			// tracker server UDP

		addConfigPort( "upnp.mapping.udptrackerport", false, "Tracker Port UDP Enable", "Tracker Port" );
	}
	
	protected void
	serviceFound(
		UPnPWANConnection		service )
	{
		boolean save_config = false;
		
		if (( service.getCapabilities() & UPnPWANConnection.CAP_UDP_TCP_SAME_PORT ) == 0 ){
			
				// doesn't support UDP and TCP on same port number - patch up
				// unfortunately some routers remember the stuffed ports and makes them unusable for
				// either UDP OR TCP until a HARD reset so we need to change both ports...
			
			UPnPMapping[]	maps = getMappings();
			
			for (int i=0;i<maps.length;i++){
				
				UPnPMapping	map = maps[i];
				
				if ( map.isEnabled() && map.isTCP()){
					
					List	others = getMappingEx( false, map.getPort());
					
					if ( others.size() == 0 ){
						
						continue;
					}
					
					boolean	enabled = false;
					
					for (int j=0;j<others.size();j++){
					
						UPnPMapping	other = (UPnPMapping)others.get(j);
						
						if ( other.isEnabled()){
							
							enabled	= true;
						}
					}
					
					if ( enabled ){
						
						int	new_port_1;
						int	new_port_2;
						
						while( true ){
						
							int	new_port = RandomUtils.generateRandomNetworkListenPort();
						
							if ( getMapping( true, new_port ) == null && getMapping( false, new_port ) == null){
								
								new_port_1 = new_port;
								
								break;
							}
						}
						
						while( true ){
							
							int	new_port = RandomUtils.generateRandomNetworkListenPort();
						
							if ( getMapping( true, new_port ) == null && getMapping( false, new_port ) == null){
								
								if ( new_port_1 != new_port ){
									
									new_port_2 = new_port;
								
									break;
								}
							}
						}
						
						String	others_str = "";
						
						for (int j=0;j<others.size();j++){
						
							UPnPMapping	other = (UPnPMapping)others.get(j);
							
							if ( other.isEnabled()){
																
								others_str += (others_str.length()==0?"":",") + other.getString( new_port_2 );
							}
						}
						
						plugin.logAlert( 
								LoggerChannel.LT_WARNING,
								"upnp.portchange.alert",
								new String[]{ 
										map.getString( new_port_1 ),
										String.valueOf( map.getPort()),
										others_str,
										String.valueOf( map.getPort())});

						map.setPort( new_port_1 );
						
						for (int j=0;j<others.size();j++){
							
							UPnPMapping	other = (UPnPMapping)others.get(j);
							
							if ( other.isEnabled()){
	
								other.setPort( new_port_2 );
							}
						}
						
						save_config	= true;
					}
				}
			}
		}
		
		if ( save_config ){
			
			COConfigurationManager.save();
		}
	}

	protected UPnPMapping
	addConfigPort(
		String			name_resource,
		boolean			tcp,
		boolean			enabled,
		final String	int_param_name )
	{
		int	value = COConfigurationManager.getIntParameter(int_param_name);
		
		final UPnPMapping	mapping = addMapping( name_resource, tcp, value, enabled );
		
		mapping.addListener(
				new UPnPMappingListener()
				{
					public void 
					mappingChanged(
						UPnPMapping mapping) 
					{
						COConfigurationManager.setParameter( int_param_name, mapping.getPort());
					}
					
					public void
					mappingDestroyed(
						UPnPMapping	mapping )
					{
					}
				});
		
		addConfigListener(
				int_param_name,
				new ParameterListener()
				{
					public void
					parameterChanged(
						String	name )
					{
						mapping.setPort( COConfigurationManager.getIntParameter(int_param_name));
					}
				});
		
		return( mapping );
	}
	
	protected void
	addConfigPort(
		String			name_resource,
		boolean			tcp,
		final String	enabler_param_name,
		final String	int_param_name )
	{
		boolean	enabled = COConfigurationManager.getBooleanParameter(enabler_param_name);
		
		final UPnPMapping	mapping = addConfigPort( name_resource, tcp, enabled, int_param_name );
		
		mapping.addListener(
				new UPnPMappingListener()
				{
					public void 
					mappingChanged(
						UPnPMapping mapping) 
					{
						COConfigurationManager.setParameter( int_param_name, mapping.getPort());
					}
					
					public void
					mappingDestroyed(
						UPnPMapping	mapping )
					{
					}
				});
		
		addConfigListener(
				enabler_param_name,
				new ParameterListener()
				{
					public void
					parameterChanged(
						String	name )
					{
						mapping.setEnabled( COConfigurationManager.getBooleanParameter(enabler_param_name));
					}
				});
	}
	
	protected void
	addConfigPortX(
		final String	name_resource,
		final boolean	tcp,
		final String	enabler_param_name,
		final String	string_param_name )
	{
		final List	config_mappings = new ArrayList();
				
		ParameterListener	l1 = 
				new ParameterListener()
				{
					public void
					parameterChanged(
						String	name )
					{
						boolean	enabled = COConfigurationManager.getBooleanParameter(enabler_param_name);

						List ports = stringToPorts( COConfigurationManager.getStringParameter( string_param_name ));
						
						for (int i=0;i<ports.size();i++){

							int		port = ((Integer)ports.get(i)).intValue();
							
							if ( config_mappings.size() <= i ){
							
								UPnPMapping	mapping = 
									addMapping( name_resource, tcp, port, enabled );
								
								mapping.setEnabled( enabled );
								
								config_mappings.add( mapping );
								
							}else{
								
								((UPnPMapping)config_mappings.get(i)).setPort( port );
							}
						}
						
						for (int i=ports.size();i<config_mappings.size();i++){
	
							((UPnPMapping)config_mappings.get(i)).setEnabled( false );
						}
					}
				};
				
		addConfigListener( string_param_name, l1 );
				
		ParameterListener	l2 = 
				new ParameterListener()
				{
					public void
					parameterChanged(
						String	name )
					{
						List ports = stringToPorts( COConfigurationManager.getStringParameter( string_param_name ));
					
						boolean	enabled = COConfigurationManager.getBooleanParameter(enabler_param_name);
						
						for (int i=0;i<(enabled?ports.size():config_mappings.size());i++){
							
							((UPnPMapping)config_mappings.get(i)).setEnabled( enabled );
						}
					}
				};

		addConfigListener( enabler_param_name, l2 );


		l1.parameterChanged( null );
		l2.parameterChanged( null );
	}
	
	protected List
	stringToPorts(
		String	str )
	{
		str = str.replace(',', ';' );
		
		StringTokenizer	tok = new StringTokenizer( str, ";" );
		
		List	res = new ArrayList();
		
		while( tok.hasMoreTokens()){
			
			try{
				res.add( new Integer( tok.nextToken().trim()));
				
			}catch( Throwable e ){
				
				Debug.out("Invalid port entry in '" + str + "'", e);
			}
		}
		
		return( res );
	}
	
	public UPnPMapping
	addMapping(
		String		desc_resource,
		boolean		tcp,
		int			port,
		boolean		enabled )
	{
		// System.out.println( "UPnPMappingManager: added '" + desc_resource + "'" + (tcp?"TCP":"UDP") + "/" + port + ", enabled = " + enabled );
		
		UPnPMapping	mapping = new UPnPMapping(desc_resource, tcp, port, enabled );
		
		synchronized( mappings ){
		
			mappings.add( mapping );
		}
		
		added( mapping );
		
		return( mapping );
	}
	
	public UPnPMapping[]
	getMappings()
	{
		synchronized( mappings ){
			
			UPnPMapping[]		res = new UPnPMapping[mappings.size()];
		
			mappings.toArray( res );
		
			return( res );
		}
	}
	
	public UPnPMapping
	getMapping(
		boolean	tcp,
		int		port )
	{
		synchronized( mappings ){
			
			for (int i=0;i<mappings.size();i++){
				
				UPnPMapping	mapping = (UPnPMapping)mappings.get(i);
				
				if ( mapping.isTCP() == tcp && mapping.getPort() == port ){
					
					return( mapping );
				}
			}
		}
		
		return( null );
	}
	
	public List
	getMappingEx(
		boolean	tcp,
		int		port )
	{
		List	res = new ArrayList();
		
		synchronized( mappings ){
			
			for (int i=0;i<mappings.size();i++){
				
				UPnPMapping	mapping = (UPnPMapping)mappings.get(i);
				
				if ( mapping.isTCP() == tcp && mapping.getPort() == port ){
					
					res.add( mapping );
				}
			}
		}
		
		return( res );
	}
	
	protected void
	added(
		UPnPMapping		mapping )
	{
		mapping.addListener(
			new UPnPMappingListener()
			{
				public void
				mappingChanged(
					UPnPMapping	mapping )
				{
				}
				
				public void
				mappingDestroyed(
					UPnPMapping	mapping )
				{
					synchronized( mappings ){
						
						mappings.remove( mapping );
					}
				}
			});
		
		for (UPnPMappingManagerListener listener: listeners){
			
			try{
				listener.mappingAdded( mapping );
				
			}catch( Throwable e ){
				
				Debug.out( e );
			}
		}
	}
	
	public void
	addListener(
		UPnPMappingManagerListener	l )
	{
		listeners.add(l);
	}
	
	public void
	removeListener(
		UPnPMappingManagerListener	l )
	{
		listeners.remove(l);
	}
	
	protected void
	addConfigListener(
		final String				param,
		final ParameterListener		listener )
	{
		COConfigurationManager.addParameterListener(
			param,
			new ParameterListener()
			{
				public void 
				parameterChanged(
					String name )
				{
					async_dispatcher.dispatch(
						new AERunnable()
						{
							public void
							runSupport()
							{
								listener.parameterChanged( param );
							}
						});
				}
			});
	}
}
