 /*
 * Created on 06-Mar-2005
 * 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 org.gudy.azureus2.core3.util.protocol.azplug;

import java.util.*;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLDecoder;

import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.UrlUtils;
import org.gudy.azureus2.plugins.PluginInterface;
import org.gudy.azureus2.plugins.ipc.IPCException;
import org.gudy.azureus2.plugins.ipc.IPCInterface;

import com.aelitis.azureus.core.AzureusCoreFactory;

/**
 * @author parg
 *
 */

public class 
AZPluginConnection
	extends HttpURLConnection
{
	private int		response_code	= HTTP_OK;
	private String	response_msg	= "OK";
	
	private InputStream					input_stream;
	private Map<String,List<String>> 	headers = new HashMap<String, List<String>>();
	
	protected
	AZPluginConnection(
		URL		_url )
	{
		super( _url );
	}
	
	public void
	connect()
		throws IOException
		
	{
		String url = getURL().toString();
		
		int	pos = url.indexOf( "?" );
		
		if ( pos == -1 ){
			
			throw( new IOException( "Malformed URL - ? missing" ));
		}
		
		url = url.substring( pos+1 );
		
		String[]	bits = url.split( "&" );
		
		Map args = new HashMap();
		
		for (int i=0;i<bits.length;i++ ){
			
			String	bit = bits[i];
			
			String[] x = bit.split( "=" );
			
			if ( x.length == 2 ){
				
				String	lhs = x[0];
				String	rhs = UrlUtils.decode(x[1] );
				
				args.put( lhs.toLowerCase(), rhs );
			}
		}
		
		String	plugin_id = (String)args.get( "id" );
		
		if ( plugin_id == null ){
			
			throw( new IOException( "Plugin id missing" ));
		}
		
		String	plugin_name = (String)args.get( "name" );
		String	arg			= (String)args.get( "arg" );
		
		if ( arg == null ){
			
			arg = "";
		}
		
		String plugin_str;
		
		if ( plugin_name == null ){
			
			plugin_str = "with id '" + plugin_id + "'"; 
			
		}else{
			
			plugin_str = "'" + plugin_name + "' (id " + plugin_id + ")";
		}
		
		// AZPluginConnection is called via reflection
		// Let's just assume that the Core is avail..
		
		PluginInterface pi = AzureusCoreFactory.getSingleton().getPluginManager().getPluginInterfaceByID( plugin_id );
		
		if ( pi == null ){
			
			throw( new IOException( "Plugin " + plugin_str + " is required - go to 'Tools->Plugins->Installation Wizard' to install." ));
		}
		
		IPCInterface ipc = pi.getIPC();
		
		try{
			if ( ipc.canInvoke( "handleURLProtocol", new Object[]{ this, arg })){
					
				input_stream = (InputStream)ipc.invoke( "handleURLProtocol", new Object[]{ this, arg });

			}else{
			
				input_stream = (InputStream)ipc.invoke( "handleURLProtocol", new Object[]{ arg });
			}
		}catch( IPCException ipce ){
			
			Throwable e = ipce;
			
			if ( e.getCause() != null ){
				
				e = e.getCause();
			}
			
			throw( new IOException( "Communication error with plugin '" + plugin_str + "': " + Debug.getNestedExceptionMessage(e)));
		}
	}
	
    public Map<String,List<String>> 
    getHeaderFields() 
    {
        return( headers );
    }
    
    public String
    getHeaderField(
    	String	name )
    {
    	List<String> values = headers.get( name );
    	
    	if ( values == null || values.size() == 0 ){
    		
    		return( null );
    	}
    	
    	return( values.get( values.size()-1 ));
    }
    
    public void
    setHeaderField(
    	String	name,
    	String	value )
    {
       	List<String> values = headers.get( name );
       	
       	if ( values == null ){
       		
       		values = new ArrayList<String>();
       		
       		headers.put( name, values );
       	}

       	values.add( value );
    }
    
	public InputStream
	getInputStream()
	
		throws IOException
	{
		return( input_stream );
	}
	
	public void
	setResponse(
		int		_code,
		String	_msg )
	{
		response_code		= _code;
		response_msg		= _msg;
	}
	
	public int
	getResponseCode()
	{
		return( response_code );
	}
	
	public String
	getResponseMessage()
	{
		return( response_msg );
	}
	
	public boolean
	usingProxy()
	{
		return( false );
	}
	
	public void
	disconnect()
	{
	}
}
