/*
 * Created on 8 juil. 2003
 * 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.ui.swt;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.*;

import com.aelitis.azureus.core.*;
import com.aelitis.azureus.core.impl.AzureusCoreSingleInstanceClient;
import com.aelitis.azureus.ui.UIFunctions;
import com.aelitis.azureus.ui.UIFunctionsManager;
import com.aelitis.azureus.ui.swt.UIFunctionsSWT;

import org.gudy.azureus2.core3.util.*;
import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.config.impl.ConfigurationDefaults;
import org.gudy.azureus2.core3.logging.*;
import org.gudy.azureus2.plugins.update.UpdateInstaller;
import org.gudy.azureus2.plugins.update.UpdateManager;
import org.gudy.azureus2.ui.swt.mainwindow.TorrentOpener;
import org.gudy.azureus2.ui.swt.sharing.ShareUtils;

/**
 * @author Olivier
 * 
 */
public class 
StartServer
{
	private static final LogIDs LOGID = LogIDs.GUI;

  private ServerSocket socket;
  private int state;

  private boolean bContinue;
  public static final int STATE_FAULTY = 0;
  public static final int STATE_LISTENING = 1;

  protected List		queued_torrents = new ArrayList();
  protected boolean		core_started	= false;
  protected AEMonitor	this_mon		= new AEMonitor( "StartServer" );
  
  public 
  StartServer()
    {
    try {
    	// DON'T USE LOGGER HERE DUE TO COMMENTS BELOW - IF AZ ALREADY RUNNING THEN THE SERVERSOCKET
    	// CALL WILL THROW AN EXCEPTION 
    	
    	socket = new ServerSocket(Constants.INSTANCE_PORT, 50, InetAddress.getByName("127.0.0.1")); //NOLAR: only bind to localhost
        
        state = STATE_LISTENING;    
        
        if (Logger.isEnabled())
        	Logger.log(new LogEvent(LOGID, "StartServer: listening on "
        			+ "127.0.0.1:"+Constants.INSTANCE_PORT+" for passed torrent info"));
    
    }catch (Throwable t) {
    	
		// DON'T USE LOGGER here as we DON't want to initialise all the logger stuff
		// and in particular AEDiagnostics config dirty stuff!!!!

      state = STATE_FAULTY;
      String reason = t.getMessage() == null ? "<>" : t.getMessage();

      System.out.println( "StartServer ERROR: unable" + " to bind to 127.0.0.1:"+Constants.INSTANCE_PORT+" listening"
							+ " for passed torrent info: " + reason);
    }
  }

    public void
    pollForConnections(
   	 	final AzureusCore		azureus_core )

	{
        azureus_core.addLifecycleListener(
		    	new AzureusCoreLifecycleAdapter()
				{
					public void
					componentCreated(
						AzureusCore 			core, 
						AzureusCoreComponent	component) 
					{
						if ( component instanceof UIFunctionsSWT ){
		    			
							openQueuedTorrents();
						}
		    		}
				});
        
        if ( socket != null ){
        	
		    Thread t = 
		    	new AEThread("Start Server")
				{
		    		public void 
		    		runSupport()
					{
		    			pollForConnectionsSupport( azureus_core );
		    		}
				};
		    
			t.setDaemon(true);
				
			t.start(); 
        }
	}
    
  private void 
  pollForConnectionsSupport(
		 final AzureusCore		core )
  {
    bContinue = true;
    while (bContinue) {
      BufferedReader br = null;
      try {
        Socket sck = socket.accept();
        String address = sck.getInetAddress().getHostAddress();
        if (address.equals("localhost") || address.equals("127.0.0.1")) {
          br = new BufferedReader(new InputStreamReader(sck.getInputStream(),Constants.DEFAULT_ENCODING));
          String line = br.readLine();
          //System.out.println("received : " + line);
          
          if (Logger.isEnabled())
						Logger.log(new LogEvent(LOGID, "Main::startServer: received '"
								+ line + "'"));
      	 
          if (line != null) {
        	  String [] args = parseArgs(line);
        	  if (args != null && args.length > 0) {
        		  String debug_str = args[0];
        		  for (int i=1; i<args.length; i++) {
        			  debug_str += " ; " + args[i];
        		  }
        		  Logger.log(new LogEvent(LOGID, "Main::startServer: decoded to '" + debug_str + "'"));
        		  processArgs(core,args);
        	  }
          }
        }
        sck.close();

      }
      catch (Exception e) {
        if(!(e instanceof SocketException))
        	Debug.printStackTrace( e );      
        //bContinue = false;
      } finally {
        try {
          if (br != null)
            br.close();
        } catch (Exception e) { /*ignore */
        }
      }
    }
  }
  
  private static String[] parseArgs(String line) {
	  if (!line.startsWith(AzureusCoreSingleInstanceClient.ACCESS_STRING + ";")) {return null;}

	  // I'm sure there's a lovely regex which could do this, but I can't be bothered to figure
	  // it out.
	  ArrayList parts = new ArrayList();
	  StringBuffer buf = new StringBuffer();
	  boolean escape_mode = false;
	  char c;
	  for (int i=AzureusCoreSingleInstanceClient.ACCESS_STRING.length() + 1; i<line.length(); i++) {
		  c = line.charAt(i);
		  if (escape_mode) {buf.append(c); escape_mode = false;}
		  else if (c == '&') {escape_mode = true;}
		  else if (c == ';') {parts.add(buf.toString()); buf.setLength(0);}
		  else {buf.append(c);}
	  }
	  if (buf.length() > 0) {parts.add(buf.toString());}
	  return (String[])parts.toArray(new String[parts.size()]);
		  
  }
  
  protected void 
  processArgs(
    AzureusCore		core,
   	String 			args[]) 
  {
    if (args.length < 1 || !args[0].equals( "args" )){
    	
    	return;
    }
    
    boolean showMainWindow = args.length == 1 || COConfigurationManager.getBooleanParameter( "Activate Window On External Download" );

    boolean	open	= true;
    
    for (int i = 1; i < args.length; i++) {

    	String	arg = args[i];
        	
    	if ( i == 1 ){
    		
	  	    if ( arg.equalsIgnoreCase( "--closedown" ) || arg.equalsIgnoreCase( "--shutdown" )){
	
	  	    		// discard any pending updates as we need to shutdown immediately (this
	  	    		// is called from installer to close running instance)
	  	    	
	  	    	try{
	  	    		UpdateManager um = core.getPluginManager().getDefaultPluginInterface().getUpdateManager();
	  	    		
	  	    		UpdateInstaller[] installers = um.getInstallers();
	  	    		
	  	    		for ( UpdateInstaller installer: installers ){
	  	    			
	  	    			installer.destroy();
	  	    		}
	  	    	}catch( Throwable e ){
	  	    	}
	  	    	
	  	    	UIFunctions uiFunctions = UIFunctionsManager.getUIFunctions();
	  	    	
	  	    	if ( uiFunctions != null ){
	  	    		
	  	    		uiFunctions.dispose(false, false);
	  	    	}
	  	    	
	  	    	return;
	  	    	
	  	    }else if ( arg.equalsIgnoreCase( "--restart" )){
	  	    		
	  	    	UIFunctions uiFunctions = UIFunctionsManager.getUIFunctions();
	  	    	
	  	    	if ( uiFunctions != null ){
	  	    		
	  	    		uiFunctions.dispose(true, false);
	  	    	}
	  	    	
	  	    	return;
	  	    	
	  	    }else if ( arg.equalsIgnoreCase( "--open" )){
	  	    	
	  	    	showMainWindow = true;

	  	    	continue;
	  	    	
	  	    }else if ( arg.equalsIgnoreCase( "--share" )){
	  	    	
	  	    	showMainWindow = true;

	  	    	open	= false;
	  	    	
	  	    	continue;
	  	    }
    	}
  	    
        String file_name = arg;
        
        File file = new File(file_name);
        
        if ( !file.exists() && !isURI( file_name )){
        	
        	String	magnet_uri = UrlUtils.normaliseMagnetURI( file_name );
        	
        	if ( magnet_uri != null ){
        		
        		file_name = magnet_uri;
        	}
        }
        
        if ( isURI( file_name )) {
        	
        	if (Logger.isEnabled())
						Logger.log(new LogEvent(LOGID, "StartServer: args[" + i
								+ "] handling as a URI: " + file_name));
        
        }else{

            try {
              

              if (!file.exists()) {

                throw (new Exception("File not found"));
              }

              file_name = file.getCanonicalPath();

              Logger.log(new LogEvent(LOGID, "StartServer: file = " + file_name));

            } catch (Throwable e) {

            	Logger.log(new LogAlert(LogAlert.REPEATABLE, LogAlert.AT_ERROR,
            			"Failed to access torrent file '" + file_name
            			+ "'. Ensure sufficient temporary file space "
            			+ "available (check browser cache usage)."));
            }
        }
        
        boolean	queued = false;
        
        try {
          this_mon.enter();

          if (!core_started) {

            queued_torrents.add( new Object[]{ file_name, new Boolean( open )});

            queued = true;
          }
        } finally {

          this_mon.exit();
        }

        if ( !queued ){
 
        	handleFile( file_name, open );
        }
      }

    if (showMainWindow) {
			showMainWindow();
		}
  }
  
  protected boolean
  isURI(
	String	file_name )
  {
      String file_name_lower = file_name.toLowerCase();
      
	  return( 	file_name_lower.startsWith( "http:" ) || 
			  	file_name_lower.startsWith( "https:" ) || 
			  	file_name_lower.startsWith( "magnet:" ) ||
				file_name_lower.startsWith( "maggot:" ) ||
			  	file_name_lower.startsWith( "bc:" ) ||
			  	file_name_lower.startsWith( "bctp:" ) ||
	  			file_name_lower.startsWith( "dht:" ));
  }
  
  protected void
  handleFile(
	String		file_name,
	boolean		open )
  {
      try {

      	if ( open ){
      		
      		TorrentOpener.openTorrent(file_name);
      		
      	}else{
      		
      		File	f = new File( file_name );
      		
      		if ( f.isDirectory()){
      			
      			ShareUtils.shareDir( file_name );
      			
      		}else{
      			
         		ShareUtils.shareFile( file_name );            		 
      		}
      	}
      } catch (Throwable e) {

        Debug.printStackTrace(e);
      }
  }
  
  protected void
  openQueuedTorrents()
  {
    try{
      	this_mon.enter();
      	
      	core_started	= true;
      	
    }finally{
      	
      	this_mon.exit();
    }
     	
    for (int i=0;i<queued_torrents.size();i++){
    	
    	Object[]	entry = (Object[])queued_torrents.get(i);
    	
    	String	file_name 	= (String)entry[0];
    	boolean	open		= ((Boolean)entry[1]).booleanValue();
    	
    	handleFile( file_name, open );
    }
  }
  
  protected void 
  showMainWindow() 
  {
  	UIFunctions uiFunctions = UIFunctionsManager.getUIFunctions();
  	if (uiFunctions != null) {
  		uiFunctions.bringToFront();
  	}
  }
  
  public void stopIt() {
    bContinue = false;
    try {
      if ( socket != null ){
    	  socket.close();
      }
    }
    catch (Throwable e) {/*ignore */}
  }
  /**
   * @return
   */
  public int getState() {
    return state;
  }
  
  // Test argument parsing code.
  public static void main(String [] args) {
	  String[] input_tests = new String[] {
		  "a;b;c",
		  "test",
		  AzureusCoreSingleInstanceClient.ACCESS_STRING + ";b;c;d", // Simple test
		  AzureusCoreSingleInstanceClient.ACCESS_STRING + ";b;c&;d;e", // Less simple test
		  AzureusCoreSingleInstanceClient.ACCESS_STRING + ";b;c&&;d;e", // Even less simple test
		  AzureusCoreSingleInstanceClient.ACCESS_STRING + ";b;c&&&;d;e", // Awkward test
	  };
	  
	  String[][] output_results = new String[][] {
        null,
        null,
        new String[] {"b", "c", "d"},
        new String[] {"b", "c;d", "e"},
        new String[] {"b", "c&", "d", "e"},
        new String[] {"b", "c&;d", "e"},
	  };
	  
	  for (int i=0; i<input_tests.length; i++) {
		  System.out.println("Testing: " + input_tests[i]);
		  String[] result = parseArgs(input_tests[i]);
		  if (result == output_results[i]) {continue;}
		  if (Arrays.equals(result, output_results[i])) {continue;}
		  System.out.println("TEST FAILED");
		  System.out.println("  Expected: " + Arrays.asList(output_results[i]));
		  System.out.println("  Decoded : " + Arrays.asList(result));
		  System.exit(1);
	  }
	  
	  System.out.println("Done.");
  }

}
