/*
 * Created on 15-Dec-2005
 * Created by Paul Gardner
 * Copyright (C) 2005, 2006 Aelitis, 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.
 * 
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */

package com.aelitis.azureus.plugins.extseed;

import java.util.*;

import org.gudy.azureus2.plugins.messaging.Message;
import org.gudy.azureus2.plugins.network.Connection;
import org.gudy.azureus2.plugins.peers.*;
import org.gudy.azureus2.plugins.torrent.Torrent;
import org.gudy.azureus2.plugins.utils.*;


public class 
ExternalSeedPeer
	implements Peer, ExternalSeedReaderListener
{
	private ExternalSeedPlugin		plugin;
	
	private PeerManager				manager;
	private PeerStats				stats;
	private Map						user_data;
	
	private	ExternalSeedReader		reader;
	
	private int						state;
	
	private byte[]					peer_id;
	private boolean[]				available;
	private boolean					availabilityAdded =false;
	private long					snubbed;
	private boolean					is_optimistic;
	
	private Monitor					connection_mon;
	private boolean					peer_added;
	
	private List					listenerList;
	private Monitor					listenerListMon;
		
	protected
	ExternalSeedPeer(
		ExternalSeedPlugin		_plugin,
		ExternalSeedReader		_reader )
	{
		plugin	= _plugin;
		reader	= _reader;
				
		connection_mon	= plugin.getPluginInterface().getUtilities().getMonitor();
		
		Torrent	torrent = reader.getTorrent();
				
		available	= new boolean[(int)torrent.getPieceCount()];
		
		Arrays.fill( available, true );
		
		peer_id	= new byte[20];
		
		new Random().nextBytes( peer_id );
		
		peer_id[0]='E';
		peer_id[1]='x';
		peer_id[2]='t';
		peer_id[3]=' ';
		
		listenerList =new ArrayList();
		listenerListMon	= plugin.getPluginInterface().getUtilities().getMonitor();
		
		_reader.addListener( this );
	}
	
	protected void
	setManager(
		PeerManager	_manager )
	{
		setState(Peer.CONNECTING);
		
		try{
			connection_mon.enter();

			manager	= _manager;
			
			if ( manager != null ){
				
				stats = manager.createPeerStats( this );
			}
			
			checkConnection();
			
		}finally{
			
			connection_mon.exit();
		}
	}
	
	public PeerManager
	getManager()
	{
		return( manager );
	}
	
	protected void 
	setState(
		int newState )
	{
		state	= newState;
		
		fireEvent( PeerEvent.ET_STATE_CHANGED, new Integer( newState ));
	}
	
	protected boolean
	checkConnection()
	{
		boolean	state_changed = false;
		
		try{
			connection_mon.enter();
			
			boolean	active = reader.checkActivation( manager );
			
			if ( manager != null && active != peer_added ){
				
				state_changed	= true;
				
				boolean	peer_was_added	= peer_added;
				
				peer_added	= active;
				
				if ( active ){
					
					addPeer();
					
				}else{
										
					if ( peer_was_added ){
						
						removePeer();
					}
				}
			}
		}finally{
			
			connection_mon.exit();
		}
		
		return( state_changed );
	}
	
	protected void
	addPeer()
	{
		setState(Peer.HANDSHAKING);

		manager.addPeer( this );
		
		setState(Peer.TRANSFERING);

		try{
			listenerListMon.enter();

			fireEvent( PeerEvent.ET_ADD_AVAILABILITY, getAvailable());
		
			availabilityAdded	= true;
		
		}finally{
			
			listenerListMon.exit();
		}
	}
	
	protected void
	removePeer()
	{	
		setState(Peer.CLOSING);
	
		try{
			listenerListMon.enter();
			
			if ( availabilityAdded ){
				
				fireEvent( PeerEvent.ET_REMOVE_AVAILABILITY, getAvailable());
				
				availabilityAdded	= false;
			}
		}finally{
			
			listenerListMon.exit();
		}
		
		manager.removePeer( this );
	}
	
	public void
	requestComplete(
		PeerReadRequest		request,
		PooledByteBuffer	data )
	{
		PeerManager	man = manager;
		
		if ( request.isCancelled() || man == null ){
	
			data.returnToPool();
			
		}else{
			
			try{
				man.requestComplete( request, data, this );
					
				stats.received( request.getLength());
				
			}catch( Throwable e ){
				
				data.returnToPool();
				
				e.printStackTrace();
			}
		}	
	}
	
	public void
	requestCancelled(
		PeerReadRequest		request )
	{
		PeerManager	man = manager;

		if ( man != null ){
			
			man.requestCancelled( request, this );
		}
	}
	
	public void
	requestFailed(
		PeerReadRequest		request )
	{
		PeerManager	man = manager;

		if ( man != null ){
				
			man.requestCancelled( request, this );

			try{
				connection_mon.enter();
				
				if ( peer_added ){
					
					plugin.log( reader.getName() + " failed - " + reader.getStatus() + ", permanent = " + reader.isPermanentlyUnavailable());
	
					removePeer();
					
					peer_added	= false;
				}
			}finally{
				
				connection_mon.exit();
			}
		}
	}
	
	public int 
	getState()
	{
		return state;
	}

	public byte[] 
	getId()
	{
		return( peer_id );
	}
  
	public String 
	getIp()
	{
		return( reader.getIP());
	}
  
	public int 
	getTCPListenPort()
	{
		return( 0 );
	}
  
	public int 
	getUDPListenPort()
	{
		return( 0 );
	}
  
 
	public int 
	getPort()
	{
		return( reader.getPort());
	}
	
	
	public final boolean[] 
	getAvailable()
	{
		return( available );
	}
   
	public final boolean isPieceAvailable(int pieceNumber)
	{
		return( true );
	}
	              
	public boolean
	isTransferAvailable()
	{
		return( reader.isActive());
	}
	
	public boolean isDownloadPossible()
	{
		return peer_added &&reader.isActive();
	}
	
	public boolean 
	isChoked()
	{
		return( false );
	}

	public boolean 
	isChoking()
	{
		return( false );
	}

	public boolean 
	isInterested()
	{
		return( false );
	}

	public boolean 
	isInteresting()
	{
		return( true );
	}

	public boolean 
	isSeed()
	{
		return( true );
	}
 
	public boolean 
	isSnubbed()
	{
		return snubbed !=0;
	}
 
	public long	getSnubbedTime()
	{
		if (snubbed ==0)
			return 0;
		final long now =plugin.getPluginInterface().getUtilities().getCurrentSystemTime();
		if (now <snubbed)
			snubbed =now -26;	// odds are ...
		return now -snubbed;
	}
 
	public void 
	setSnubbed( 
		boolean b)
	{
		if (!b)
			snubbed =0;
		else if (snubbed ==0)
			snubbed =plugin.getPluginInterface().getUtilities().getCurrentSystemTime();
	}
	
	public boolean 
	isOptimisticUnchoke()
	{
		return( is_optimistic );
	}
	  
	public void 
	setOptimisticUnchoke( 
		boolean _is_optimistic )
	{
		is_optimistic	= _is_optimistic;
	}

	public PeerStats 
	getStats()
	{
		return( stats );
	}
 	
	public boolean 
	isIncoming()
	{
		return( false );
	}
	
	public int 
	getPercentDone()
	{
		return( 1000 );
	}

	public int 
	getPercentDoneInThousandNotation()
	{
		return( 1000 );
	}
	
	public String 
	getClient()
	{
		return( reader.getName());
	}
	
	public List
	getExpiredRequests()
	{
		return( reader.getExpiredRequests());
		
	}
  		
	public List
	getRequests()
	{
		return( reader.getRequests());
		
	}
	public int
	getNumberOfRequests()
	{
		return( reader.getRequestCount());
	}

	public void
	cancelRequest(
		PeerReadRequest	request )
	{
		reader.cancelRequest( request );
	}

	public boolean 
	addRequest(
		PeerReadRequest	request )
	{		
		reader.addRequest( request );
			
		return( true );
	}
	
	public void
	close(
		String 		reason,
		boolean 	closedOnError,
		boolean 	attemptReconnect )
	{
		try{
			connection_mon.enter();

			reader.cancelAllRequests();
			
			reader.deactivate( reason );
			
			peer_added	= false;
			
		}finally{
			
			connection_mon.exit();
		}
	}
	

	public void	
	addListener( 
		PeerListener	listener )
	{
		try{
			listenerListMon.enter();
						
			listenerList.add(listener);
			
		}finally{
			
			listenerListMon.exit();
		}
	}
	
	public void 
	removeListener(	
		PeerListener listener )
	{	
		try{
			listenerListMon.enter();
		
			listenerList.remove(listener);
		
		}finally{
			
			listenerListMon.exit();
		}
	}
	
	public void	
	addListener( 
		PeerListener2	listener )
	{
		try{
			listenerListMon.enter();
						
			listenerList.add(listener);
			
		}finally{
			
			listenerListMon.exit();
		}
	}
	
	public void 
	removeListener(	
		PeerListener2 listener )
	{	
		try{
			listenerListMon.enter();
		
			listenerList.remove(listener);
		
		}finally{
			
			listenerListMon.exit();
		}
	}
  
	protected void
	fireEvent(
		final int		type,
		final Object	data )
	{
		try{
			listenerListMon.enter();

			for (int i =0; i <listenerList.size(); i++){
				
				try{
					Object	 _listener = listenerList.get(i);
						
					if ( _listener instanceof PeerListener ){
						
						PeerListener	listener = (PeerListener)_listener;
						
						if ( type == PeerEvent.ET_STATE_CHANGED ){
							
							listener.stateChanged(((Integer)data).intValue());
							
						}else if ( type == PeerEvent.ET_BAD_CHUNK ){
							
							Integer[]	d = (Integer[])data;
							
							listener.sentBadChunk(d[0].intValue(),d[1].intValue());
						}
					}else{
						
						PeerListener2	listener = (PeerListener2)_listener;
	
						listener.eventOccurred(
							new PeerEvent()
							{
								public int
								getType()
								{
									return( type );
								}
								
								public Object
								getData()
								{
									return( data );
								}
							});
					}
				}catch( Throwable e ){
					
					e.printStackTrace();
				}
			}
		}finally{
			
			listenerListMon.exit();
		}
	}
	public Connection 
	getConnection()
	{
		return( null );
	}
  
  
	public boolean 
	supportsMessaging()
	{
		return( false );
	}
  
	public Message[] 
	getSupportedMessages()
	{
		return( new Message[0] );
	}
	
	public int
	getPercentDoneOfCurrentIncomingRequest()
	{
		return( 0 );
	}
		  
	public int
	getPercentDoneOfCurrentOutgoingRequest()
	{
		return( 0 );
	}
	
	public Map
	getProperties()
	{
		return( new HashMap());
	}	
	
	public void
	setUserData(
		Object		key,
		Object		value )
	{
		if ( user_data == null ){
			
			user_data	= new HashMap();
		}
		
		user_data.put( key, value );
	}
	
	public Object
	getUserData(
		Object	key )
	{
		if ( user_data == null ){
			
			return( null );
		}
		
		return( user_data.get( key ));
	}
}