/*
 * File    : TorrentDownloaderImpl.java
 * Created : 28-Feb-2004
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * 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.
 *
 * 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 ( see the LICENSE file ).
 *
 * 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 org.gudy.azureus2.pluginsimpl.local.torrent;

/**
 * @author parg
 *
 */

import java.net.*;
import java.io.*;

import org.gudy.azureus2.plugins.torrent.*;
import org.gudy.azureus2.plugins.utils.resourcedownloader.*;
import org.gudy.azureus2.pluginsimpl.local.utils.resourcedownloader.ResourceDownloaderFactoryImpl;

import org.gudy.azureus2.core3.logging.*;
import org.gudy.azureus2.core3.torrent.*;
import org.gudy.azureus2.core3.util.*;

public class 
TorrentDownloaderImpl 
	implements TorrentDownloader
{
	private static final LogIDs LOGID = LogIDs.PLUGIN;
	protected TorrentManagerImpl		manager;
	protected URL						url;
	protected ResourceDownloader		_downloader;
	
	protected boolean					encoding_requested;
	protected String					requested_encoding;
	protected boolean					set_encoding;
	
	protected
	TorrentDownloaderImpl(
		TorrentManagerImpl		_manager,
		URL						_url )
	{
		manager		= _manager;
		url			= _url;
		
		_downloader = ResourceDownloaderFactoryImpl.getSingleton().create( url );
	}
	
	protected
	TorrentDownloaderImpl(
		TorrentManagerImpl	_manager,
		URL					_url,
		String				_user_name,
		String				_password )
	{
		manager	= _manager;
		url		= _url;
		
			// assumption here is that if we have a user name and password supplied
			// then user-interaction is NOT required. Thus we set the default encoding
			// to ensure that in the unlikely event of the torrent having multiple 
			// encodings the SWT UI isn't kicked off to get an encoding when the user
			// is absent.
		
		set_encoding	= true;
		
		_downloader = ResourceDownloaderFactoryImpl.getSingleton().create( url, _user_name, _password );
		
		_downloader.addListener(new ResourceDownloaderAdapter() {
			public void reportActivity(ResourceDownloader downloader, String activity) {
				if (Logger.isEnabled())
					Logger.log(new LogEvent(LOGID, "TorrentDownloader:" + activity));
			}
		});
		
	}
	
	public Torrent
	download()
	
		throws TorrentException
	{
		try{
			return( downloadSupport( _downloader ));
			
		}catch( TorrentException e ){
			
			ResourceDownloader rd = _downloader.getClone();
			
				// try with referer
			
			UrlUtils.setBrowserHeaders( rd, url.toExternalForm());
			
			return( downloadSupport( rd ));
		}
	}
	
	private Torrent
	downloadSupport(
		ResourceDownloader downloader )
	
		throws TorrentException
	{
		InputStream	is = null;
		
		try{
			is = downloader.download();
			
			TOTorrent	torrent = TOTorrentFactory.deserialiseFromBEncodedInputStream(is);
			
			if ( encoding_requested ){
				
				manager.tryToSetTorrentEncoding( torrent, requested_encoding );
			}else{
				
				if ( set_encoding ){
					
					manager.tryToSetDefaultTorrentEncoding( torrent );
				}
			}
			
			return( new TorrentImpl(torrent ));
			
		}catch( TorrentException e ){
			
			throw( e );
			
		}catch( Throwable e ){
			
			throw( new TorrentException( "TorrentDownloader: download fails", e ));
			
		}finally{
			
			if ( is != null ){
				
				try{
					
					is.close();
					
				}catch( IOException e ){
					
					Debug.printStackTrace( e );
				}
			}
		}
	}
	
	public Torrent
	download(
		String	encoding )
	
		throws TorrentException
	{
		encoding_requested	= true;
		requested_encoding	= encoding;
		
		return( download());
	}
}
