/*
 * Created on Jun 20, 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.core3.config.impl;

import java.io.*;
import java.util.*;

import org.gudy.azureus2.core3.util.*;
import org.gudy.azureus2.core3.config.*;
import org.gudy.azureus2.core3.config.COConfigurationManager.ParameterVerifier;
import org.gudy.azureus2.core3.config.COConfigurationManager.ResetToDefaultsListener;

import com.aelitis.azureus.core.security.CryptoManager;

/**
 * A singleton used to store configuration into a bencoded file.
 *
 * @author TdC_VgA
 *
 */
public class 
ConfigurationManager 
	implements AEDiagnosticsEvidenceGenerator
{
  private static final boolean DEBUG_PARAMETER_LISTENERS = false;
  
  private static ConfigurationManager 	config_temp = null;
  private static ConfigurationManager 	config 		= null;
  private static AEMonitor				class_mon	= new AEMonitor( "ConfigMan:class" );
 
		  
  private ConcurrentHashMapWrapper<String,Object> propertiesMap;	// leave this NULL - it picks up errors caused by initialisation sequence errors
  private List transient_properties     = new ArrayList();
  
  private List<COConfigurationListener>		listenerz 			= new ArrayList<COConfigurationListener>();
  private Map<String,ParameterListener[]> 	parameterListenerz 	= new HashMap<String,ParameterListener[]>();
    
  private List<ResetToDefaultsListener>	reset_to_def_listeners = new ArrayList<ResetToDefaultsListener>();
  
  private static FrequencyLimitedDispatcher dirty_dispatcher = 
	  new FrequencyLimitedDispatcher(
			  new AERunnable()
			  {
				  public void
				  runSupport()
				  {
					  COConfigurationManager.save();
				  }
			  },
			  30*1000 );
 
  private ParameterListener 
	exportable_parameter_listener = 
		new ParameterListener() {
			
			public void 
			parameterChanged(
				String key ) 
			{
				updateExportableParameter( key );
			}
		};
	
  private Map<String,String[]>	exported_parameters = new HashMap<String, String[]>();
  private Map<String,String>	imported_parameters	= new HashMap<String, String>();
  private volatile boolean		exported_parameters_dirty;


  public static ConfigurationManager getInstance() {
  	try{
  		class_mon.enter();
  	
	  	if ( config == null){
	  		
	  			// this is nasty but I can't see an easy way around it. Unfortunately while reading the config
	  			// we hit other code (logging for example) that needs access to the config data. Things are
	  			// cunningly (?) arranged so that a recursive call here *won't* result in a further (looping)
	  			// recursive call if we attempt to load the config again. Hence this disgusting code that
	  			// goes for a second load attempt
	  		
	  		if ( config_temp == null ){
	  			
	  			config_temp = new ConfigurationManager();
	  		
	  			config_temp.load();
	  			
	  			config_temp.initialise();
	  			
	  		  	config	= config_temp;
	  		  	
	  		}else{
	  			
	  			if ( config_temp.propertiesMap == null ){
	  				
	  				config_temp.load();
	  			}
	  			
	  			return( config_temp );
	  		}
	  	}
	  	
	  	return config;
	  	
  	}finally{
  		class_mon.exit();
  	}
  }
  
  public static ConfigurationManager getInstance(Map data) {
  	try{
  		class_mon.enter();

	  	if (config == null){
	  		
	  		config = new ConfigurationManager(data);
	  	}
	  	
	  	return config;
  	}finally{
  		
  		class_mon.exit();
  	}
  }
  
  
  private 
  ConfigurationManager() 
  {
  }
  
  private 
  ConfigurationManager(
  	Map data ) 
  {
	  	// default state of play for config initialised from map is debug log files off unless already
	  	// specified
	  
	  if ( data.get("Logger.DebugFiles.Enabled") == null ){
		  
		  data.put( "Logger.DebugFiles.Enabled", new Long(0));
	  }
	  
	  propertiesMap	= new ConcurrentHashMapWrapper<String,Object>( data );
  }
  
  protected void
  initialise()
  {
		
	  //ConfigurationChecker.migrateConfig();  //removed 2201
	 	
	 ConfigurationChecker.checkConfiguration();

	 ConfigurationChecker.setSystemProperties();
		 	
	 loadExportedParameters();
	 
	 AEDiagnostics.addEvidenceGenerator( this );
  }
  
  public void load(String filename) 
  {
  	Map	data = FileUtil.readResilientConfigFile( filename, false );
  	
  		// horrendous recursive loading going on here due to logger + config depedencies. If already loaded
  		// then use the existing data as it might have already been written to...
  	
  	if ( propertiesMap == null ){
  		
  		ConcurrentHashMapWrapper<String,Object> c_map = new ConcurrentHashMapWrapper<String,Object>( data.size() + 256, 0.75f, 8 );
  		
  		c_map.putAll( data );
  		
  		propertiesMap	= c_map;
  	}
  	
/* 
 * Can't do this yet.  Sometimes, there's a default set to x, but the code
 * calls get..Parameter(..., y).  y != x.  When the user sets the the parameter
 * to x, we remove it from the list.  Later, the get..Parameter(.., y) returns
 * y because there is no entry.
 * 
 * The solution is to not allow get..Parameter(.., y) when there's a default
 * value.  Another reason to not allow it is that having two defaults confuses
 * coders.
 *  	
  	// Remove entries that are default.  Saves memory, reduces
  	// file size when saved again
    ConfigurationDefaults def = ConfigurationDefaults.getInstance();
  	Iterator it = new TreeSet(propertiesMap.keySet()).iterator();

		while (it.hasNext()) {
			String key = (String)it.next();
			Object defValue = def.getDefaultValueAsObject(key);
			if (defValue == null)
				continue;

			if (defValue instanceof Long) {
				int iDefValue = ((Long)defValue).intValue();
				int iValue = getIntParameter(key, iDefValue);
				if (iValue == iDefValue)
					propertiesMap.remove(key);
			}
			if (defValue instanceof String) {
				String sDefValue = defValue.toString();
				String sValue = getStringParameter(key, sDefValue);
				if (sValue.compareTo(sDefValue) == 0)
					propertiesMap.remove(key);
			}
		}
*/
  }
  
  public void load() {
    load("azureus.config");
    
    try {
      String[] keys = propertiesMap.keySet().toArray(new String[0]);
      for (String key : keys) {
      	if (key == null) {
      		continue;
      	}
  			if (key.startsWith("SideBar.Expanded.Category.") || key.startsWith("NameColumn.wrapText.")) {
  				removeParameter(key);
  			}
  		}
    } catch (Exception e) {
    	// not sure if I can do Debug.out here.. could be in that evil
    	// preinitialization loop of dooom
    	e.printStackTrace();
    }
  }
  
  public void save(String filename) 
  {
	if ( propertiesMap == null ){
		
			// nothing to save, initialisation not complete
		
		return;
	}
	
	/**
	 * Note - propertiesMap isn't synchronised! We'll clone the map
	 * now, because we need to modify it. The BEncoding code will
	 * create a new map object (TreeMap) because it needs to be
	 * sorted, so we might as well do it here too.
	 */ 
	TreeMap<String,Object> properties_clone = propertiesMap.toTreeMap();
	
	// Remove any transient parameters.
	if (!this.transient_properties.isEmpty()) {
		properties_clone.keySet().removeAll(this.transient_properties);
	}
	
  	FileUtil.writeResilientConfigFile( filename, properties_clone );
    
  	List<COConfigurationListener>	listeners_copy;
  	
  	synchronized( listenerz ){
    
    	listeners_copy = new ArrayList<COConfigurationListener>( listenerz );
    }
    
	for (int i=0;i<listeners_copy.size();i++){
		
		COConfigurationListener l = (COConfigurationListener)listeners_copy.get(i);
		
		if (l != null){
			
			try{
				l.configurationSaved();
				
			}catch( Throwable e ){
				
				Debug.printStackTrace( e );
			}
		}else{
			
			Debug.out("COConfigurationListener is null");
		}
	}
	
	if ( exported_parameters_dirty ){
		
		exportParameters();
	}
  }
  
  public void save() {
    save("azureus.config");
  }
  
	public void
	setDirty()
	{
		dirty_dispatcher.dispatch();
	}
	
	public boolean
	isNewInstall()
	{
		return( ConfigurationChecker.isNewInstall());
	}
	
	public Set<String>
	getDefinedParameters()
	{
		return( new HashSet<String>( propertiesMap.keySet()));
	}
	
  public boolean getBooleanParameter(String parameter, boolean defaultValue) {
    int defaultInt = defaultValue ? 1 : 0;
    int result = getIntParameter(parameter, defaultInt);
    return result == 0 ? false : true;
  }
  
  public boolean getBooleanParameter(String parameter) {
    ConfigurationDefaults def = ConfigurationDefaults.getInstance();
    int result;
    try {
      result = getIntParameter(parameter, def.getIntParameter(parameter));
    } catch (ConfigurationParameterNotFoundException e) {
      result = getIntParameter(parameter, ConfigurationDefaults.def_boolean);
    }
    return result == 0 ? false : true;
  }
  
  public boolean setParameter(String parameter, boolean value) {
    return setParameter(parameter, value ? 1 : 0);
  }
  
  private Long getLongParameterRaw(String parameter) {
    try {
      return (Long) propertiesMap.get(parameter);
    } catch (Exception e) {
      Debug.out( "Parameter '" + parameter + "' has incorrect type", e );
      return null;
    }
  }
  
  public int getIntParameter(String parameter, int defaultValue) {
    Long tempValue = getLongParameterRaw(parameter);
    return tempValue != null ? tempValue.intValue() : defaultValue;
  }
  
  public int getIntParameter(String parameter) {
  	ConfigurationDefaults def = ConfigurationDefaults.getInstance();
  	int result;
    try {
      result = getIntParameter(parameter, def.getIntParameter(parameter));
    } catch (ConfigurationParameterNotFoundException e) {
      result = getIntParameter(parameter, ConfigurationDefaults.def_int);
    }
    return result;
  }
  
  public long getLongParameter(String parameter, long defaultValue) {
    Long tempValue = getLongParameterRaw(parameter);
    return tempValue != null ? tempValue.longValue() : defaultValue;
  }
  
  public long getLongParameter(String parameter) {
  	ConfigurationDefaults def = ConfigurationDefaults.getInstance();
  	long result;
    try {
      result = getLongParameter(parameter, def.getLongParameter(parameter));
    } catch (ConfigurationParameterNotFoundException e) {
      result = getLongParameter(parameter, ConfigurationDefaults.def_long);
    }
    return result;
  }
	  
  private byte[] getByteParameterRaw(String parameter) {
    return (byte[]) propertiesMap.get(parameter);
  }
  
  public byte[] getByteParameter(String parameter) {
	  	ConfigurationDefaults def = ConfigurationDefaults.getInstance();
	  	byte[] result;
	    try {
	      result = getByteParameter(parameter, def.getByteParameter(parameter));
	    } catch (ConfigurationParameterNotFoundException e) {
	      result = getByteParameter(parameter, ConfigurationDefaults.def_bytes);
	    }
	    return result;
	  }
  
  public byte[] getByteParameter(String parameter, byte[] defaultValue) {
    byte[] tempValue = getByteParameterRaw(parameter);
    return tempValue != null ? tempValue : defaultValue;
  }
  
  private String getStringParameter(String parameter, byte[] defaultValue) {
	  byte[] bp = getByteParameter(parameter, defaultValue);
	  if ( bp == null ){
		  bp = getByteParameter(parameter, null);
	  }
      if (bp == null)
        return null;
      return bytesToString(bp);
  }
  
  public String getStringParameter(String parameter, String defaultValue) {
    String tempValue = getStringParameter(parameter, (byte[]) null);
    return tempValue != null ? tempValue : defaultValue;
  }
  
  public String getStringParameter(String parameter) {
    ConfigurationDefaults def = ConfigurationDefaults.getInstance();
    String result;
    try {
      result = getStringParameter(parameter, def.getStringParameter(parameter));
    } catch (ConfigurationParameterNotFoundException e) {
      result = getStringParameter(parameter, ConfigurationDefaults.def_String);
    }
    return result;
  }
  
  public StringList getStringListParameter(String parameter) {
  	try {  		
  		List rawList = (List) propertiesMap.get(parameter);
  		if(rawList == null)
  			return new StringListImpl();  		
  		return new StringListImpl(rawList);  	
  	} catch(Exception e) {
  		Debug.out( "Parameter '" + parameter + "' has incorrect type", e );
  		return new StringListImpl();
  	}
  }
	  

  
  public boolean setParameter(String parameter,StringList value) {
  	try {
  		List	encoded = new ArrayList();
  		
  		List	l = ((StringListImpl)value).getList();
  		
  		for (int i=0;i<l.size();i++){
  			
  			encoded.add( stringToBytes((String)l.get(i)));
  		}
  		propertiesMap.put(parameter,encoded);
  		notifyParameterListeners(parameter);
  	} catch(Exception e) {
  		Debug.printStackTrace(e);
  		return false;
  	}
  	return true;
  }
   
  public List 
  getListParameter(String parameter, List def) 
  {
  	try {  		
  		List rawList = (List) propertiesMap.get(parameter);
  		if(rawList == null)
  			return def;
  		return rawList;	
  	} catch(Exception e) {
  		Debug.out( "Parameter '" + parameter + "' has incorrect type", e );
  		return def;
  	}
  }
  
  public boolean setParameter(String parameter,List value) {
  	try {
  		propertiesMap.put(parameter,value);
  		notifyParameterListeners(parameter);
  	} catch(Exception e) {
  		Debug.printStackTrace(e);
  		return false;
  	}
  	return true;
  }

  public Map 
  getMapParameter(String parameter, Map def) 
  {
  	try {  		
		Map map = (Map) propertiesMap.get(parameter);
  		if(map == null)
  			return def;
  		return map;	
  	} catch(Exception e) {
  		Debug.out( "Parameter '" + parameter + "' has incorrect type", e );
  		return def;
  	}
  }
  
  public boolean setParameter(String parameter,Map value) {
  	try {
  		propertiesMap.put(parameter,value);
  		notifyParameterListeners(parameter);
  	} catch(Exception e) {
  		Debug.printStackTrace(e);
  		return false;
  	}
  	return true;
  }
  
  
  public String getDirectoryParameter(String parameter) throws IOException {
    String dir = getStringParameter(parameter);
    
    if( dir.length() > 0 ) {
      File temp = new File(dir);
      if (!temp.exists()) {
      	FileUtil.mkdirs(temp);
      }
      if (!temp.isDirectory()) {
        throw new IOException("Configuration error. This is not a directory: " + dir);
      }
    }

    return dir;
  }
  
  public float getFloatParameter(String parameter) {
	  return( getFloatParameter( parameter, ConfigurationDefaults.def_float ));
  }

  public float getFloatParameter(String parameter, float def_val) {
    ConfigurationDefaults def = ConfigurationDefaults.getInstance();
    try {
      Object o = propertiesMap.get(parameter);
      if (o instanceof Number) {
        return ((Number)o).floatValue();
      }
      
      String s = getStringParameter(parameter);
      
      if (!s.equals(ConfigurationDefaults.def_String))
        return Float.parseFloat(s);
    } catch (Exception e) {
    	Debug.out( "Parameter '" + parameter + "' has incorrect type", e );
    }
    
    try {
      return def.getFloatParameter(parameter);
    } catch (Exception e2) {
      return def_val;
    }
  }
  
  public boolean setParameter(String parameter, float defaultValue) {
    String newValue = String.valueOf(defaultValue);
    return setParameter(parameter, stringToBytes(newValue));
  }

  public boolean setParameter(String parameter, int defaultValue) {
		Long newValue = new Long(defaultValue);
		try {
			Long oldValue = (Long) propertiesMap.put(parameter, newValue);
			return notifyParameterListenersIfChanged(parameter, newValue, oldValue);
		} catch (ClassCastException e) {
			// Issuing a warning here would be nice, but both logging and config stuff
			// at startup create potential deadlocks or stack overflows
			notifyParameterListeners(parameter);
			return true;
		}
	}

	public boolean setParameter(String parameter, long defaultValue) {
		Long newValue = new Long(defaultValue);
		try {
			Long oldValue = (Long) propertiesMap.put(parameter, newValue);
			return notifyParameterListenersIfChanged(parameter, newValue, oldValue);
		} catch (ClassCastException e) {
			// Issuing a warning here would be nice, but both logging and config stuff
			// at startup create potential deadlocks or stack overflows
			notifyParameterListeners(parameter);
			return true;
		}
	}

	public boolean setParameter(String parameter, byte[] defaultValue) {
		try {
			byte[] oldValue = (byte[]) propertiesMap.put(parameter, defaultValue);
			return notifyParameterListenersIfChanged(parameter, defaultValue,
					oldValue);
		} catch (ClassCastException e) {
			// Issuing a warning here would be nice, but both logging and config stuff
			// at startup create potential deadlocks or stack overflows
			notifyParameterListeners(parameter);
			return true;
		}
	}
  
  public boolean setParameter(String parameter, String defaultValue) {
    return setParameter(parameter, stringToBytes(defaultValue));
  }
  
  /**
   * Returns true if a parameter with the given name exists.
   * @param key The name of the parameter to check.
   * @param explicit If <tt>true</tt>, we only check for a value which is
   *     definitely stored explicitly, <tt>false</tt> means that we'll also
   *     check against configuration defaults too.  
   */
  public boolean hasParameter(String key, boolean explicit) {
	  
	  // We have an explicit value set.
	  if (propertiesMap.containsKey(key)) {return true;}
	  
	  // We have a default value set.
	  if ((!explicit) && ConfigurationDefaults.getInstance().hasParameter(key)) {
		  return true;
	  }
	  
	  return false;
  }

  public boolean 
  verifyParameter(
	String parameter, 
	String value )
  {
	  List verifiers = ConfigurationDefaults.getInstance().getVerifiers(parameter);
	  
	  if ( verifiers != null ){
		  try{
			  for (int i=0;i<verifiers.size();i++){

				  ParameterVerifier	verifier = (ParameterVerifier)verifiers.get(i);

				  if ( verifier != null ){
					  
					  try{
						  if ( !verifier.verify(parameter,value)){
							  
							  return( false );
						  }
					  }catch( Throwable e ){
						  
						  Debug.printStackTrace( e );
					  }
				  }
			  }
		  }catch( Throwable e ){

			  // we're not synchronized so possible but unlikely error here

			  Debug.printStackTrace( e );
		  }
	  }  
	  
	  return( true );
  }
  
	public boolean setRGBParameter(String parameter, int red, int green, int blue) {
    boolean bAnyChanged = false;
    bAnyChanged |= setParameter(parameter + ".red", red);
    bAnyChanged |= setParameter(parameter + ".green", green);
    bAnyChanged |= setParameter(parameter + ".blue", blue);
    if (bAnyChanged)
      notifyParameterListeners(parameter);

    return bAnyChanged;
	}
	
	public boolean setRGBParameter(String parameter, int[] rgb, boolean override) {
		boolean changed = false;
		if (rgb == null) {
			changed |= removeParameter(parameter + ".override");
			changed |= removeParameter(parameter + ".red");
			changed |= removeParameter(parameter + ".green");
			changed |= removeParameter(parameter + ".blue");
		}
		else {
			changed |= setParameter(parameter + ".override", override);
			changed |= setRGBParameter(parameter, rgb[0], rgb[1], rgb[2]);
		}
		if (changed) {
			notifyParameterListeners(parameter);
		}
		return changed;
	}
  
  // Sets a parameter back to its default
  public boolean setParameter(String parameter) throws ConfigurationParameterNotFoundException {
    ConfigurationDefaults def = ConfigurationDefaults.getInstance();
    try {
      return setParameter(parameter, def.getIntParameter(parameter));
    } catch (Exception e) {
      return setParameter(parameter, def.getStringParameter(parameter));
    }
  }
  
  public Object
  getParameter(
	String	name )
  {
	  Object value = propertiesMap.get( name );
	  
	  if ( value == null ){
		  
		  value = ConfigurationDefaults.getInstance().getParameter( name );
	  }
	  
	  return( value );
  }
  
  /**
   * Set the raw parameter value to store in the properties map. This should
   * only be used by trusted callers, and has been added to support external
   * plugin config files.
   * 
   * @param parameter Parameter name.
   * @param value A bencode-ably safe value.
   */
  public void setParameterRawNoNotify(String parameter, Object value) {
	  this.propertiesMap.put(parameter, value);
  }
  
  /**
   * Use this method to record a parameter as one which can be stored
   * here, but shouldn't be saved in azureus.config. Instead, some external
   * object should be responsible for the parameter's persistency (if it
   * should have any at all).
   */
  public void registerTransientParameter(String param) {
	  this.transient_properties.add(param);
  }
  
  /**
   * Remove the given configuration parameter completely.
   * @param parameter to remove
   * @return true if found and removed, false if not
   */
  public boolean removeParameter( String parameter ) {
    boolean removed = propertiesMap.remove( parameter ) != null;
    if (removed)
    	notifyParameterListeners(parameter);
    return removed;
  }
  
  public boolean removeRGBParameter(String parameter) {
    boolean bAnyChanged = false;
    bAnyChanged |= removeParameter(parameter + ".red");
    bAnyChanged |= removeParameter(parameter + ".green");
    bAnyChanged |= removeParameter(parameter + ".blue");
    bAnyChanged |= removeParameter(parameter + ".override");
    if (bAnyChanged)
      notifyParameterListeners(parameter);

    return bAnyChanged;
  }
  
  /**
   * Does the given parameter exist.
   * @param parameter to check
   * @return true if exists, false if not present
   */
  
  public boolean 
  doesParameterNonDefaultExist( 
  	String parameter ) 
  {
    return propertiesMap.containsKey( parameter );
  }
  
  
  
  private boolean  notifyParameterListenersIfChanged(String parameter, Long newValue, Long oldValue) {
    if(oldValue == null || 0 != newValue.compareTo(oldValue)) {
      notifyParameterListeners(parameter);
      return true;
    }
    return false;
  }

  private boolean notifyParameterListenersIfChanged(String parameter, byte[] newValue, byte[] oldValue) {
    if(oldValue == null || !Arrays.equals(newValue, oldValue)) {
      notifyParameterListeners(parameter);
      return true;
    }
    return false;
  }
    
  public void
  addResetToDefaultsListener(
	  ResetToDefaultsListener		l )
  {
	  synchronized( reset_to_def_listeners ){
	  
		  reset_to_def_listeners.add( l );
	  }
  }
    
  public void
  registerExportedParameter(
	 String		name,
	 String		key )
  {
	  synchronized( exported_parameters ){
		  
		  String[] entry = exported_parameters.get( key );
		  
		  if ( entry == null ){
			  
			  entry = new String[]{ name, imported_parameters.remove( name ) };
			  
			  exported_parameters.put( key, entry );
		  }
	  }
	  
	  addParameterListener( 
		key,
		exportable_parameter_listener );
	  
	  updateExportableParameter( key );
  }
  
  
  private void
  updateExportableParameter(
	String		key )
  {
	  Object	o_value = getParameter( key );
	  
	  String	value;
	  
	  if ( o_value == null ){
		  
		  value = null;
		  
	  }else if ( o_value instanceof byte[] ){
		  
		  try{
			  value = new String((byte[])o_value, "UTF-8" );
			  
		  }catch( UnsupportedEncodingException e ){
			  
			  value = null;
		  }
	  }else{
		  
		  value = String.valueOf( o_value );
	  }
	  
	  synchronized( exported_parameters ){
		  
		  String[]	entry = exported_parameters.get( key );
		  
		  if ( entry != null ){
			  
			  String existing = entry[1];
			  
			  if ( existing != value ){
				  
				  if ( existing == null || value == null || !existing.equals( value )){
					  
					  entry[1] = value;
					  
					  if ( !exported_parameters_dirty ){
					  
						  exported_parameters_dirty = true;
						  
						  new DelayedEvent( 
								 "epd", 
								 5000,
								 new AERunnable()
								 {
									
									@Override
									public void 
									runSupport() 
									{
										exportParameters();
									}
								});
					  }
				  }
			  }
		  }
	  }
  }
  
  private void
  exportParameters()
  {
	  synchronized( exported_parameters ){
		  
		  if ( !exported_parameters_dirty ){
			  
			  return;
		  }
		  
		  exported_parameters_dirty = false;
		  
		  try{
			  TreeMap<String,String> tm  = new TreeMap<String,String>();
			  
			  Set<String>	exported_keys = new HashSet<String>();
			  
			  for ( String[] entry: exported_parameters.values()){
				  
				  String	key		= entry[0];
				  String	value 	= entry[1];
				  
				  exported_keys.add( key );
				  
				  if ( value != null ){
					  
					  tm.put( key, value );
				  }
			  }
			  	
			  for ( Map.Entry<String,String> entry: imported_parameters.entrySet()){
				  
				  String key = entry.getKey();
				  
				  if ( !exported_keys.contains( key)){
					  
					  tm.put( key, entry.getValue());
				  }
			  }
			  
			  File parent_dir = new File(SystemProperties.getUserPath());
			  
			  File props = new File( parent_dir, "exported_params.properties" );
			  
			  PrintWriter pw = new PrintWriter( new OutputStreamWriter( new FileOutputStream( props ), "UTF-8" ));
			  
			  try{
				  for ( Map.Entry<String, String> entry: tm.entrySet()){
					  
					  pw.println( entry.getKey() + "=" + entry.getValue());
				  }
				  
			  }finally{
				  
				  pw.close();
			  }
		  }catch( Throwable e ){
			  
			  e.printStackTrace();
		  }
	  }
  }
  
  private void
  loadExportedParameters()
  {
	  synchronized( exported_parameters ){
		  
		  try{
			  File parent_dir = new File(SystemProperties.getUserPath());
			  
			  File props = new File( parent_dir, "exported_params.properties" );
	
			  if ( props.exists()){
				  
				  LineNumberReader lnr = new LineNumberReader( new InputStreamReader( new FileInputStream( props ), "UTF-8" ));
				  
				  try{
					  while( true ){
						  
						  String	line = lnr.readLine();
						  
						  if ( line == null ){
							  
							  break;
						  }
						  
						  String[] bits = line.split( "=" );
						  
						  if ( bits.length == 2 ){
							  
							  String	key 	= bits[0].trim();
							  String	value	= bits[1].trim();
							  
							  if ( key.length() > 0 && value.length() > 0 ){
								  
								  imported_parameters.put( key, value );
							  }
						  }
					  }
				  }finally{
					  
					  lnr.close();
				  }
			  }
		  }catch( Throwable e ){
			  
			  e.printStackTrace();
		  }
	  }
	  
	  COConfigurationManager.setIntDefault( "instance.port", Constants.INSTANCE_PORT );
	  
	  registerExportedParameter( "instance.port", "instance.port" );
  }
  
  public void
  resetToDefaults()
  {
	  ConfigurationDefaults def = ConfigurationDefaults.getInstance();
	  
	  List<String> def_names = new ArrayList<String>((Set<String>)def.getAllowedParameters());
	  
	  for ( String s: def_names ){
	  
		  if ( propertiesMap.remove( s ) != null ){
			 
			  notifyParameterListeners( s );
		  }
	  }
	  
	  List<ResetToDefaultsListener>	listeners;
	  
	  synchronized( reset_to_def_listeners ){
		
		  listeners = new ArrayList<ResetToDefaultsListener>( reset_to_def_listeners );
	  }
	  
	  for ( ResetToDefaultsListener l: listeners ){
		  
		  try{
			  l.reset();
			  
		  }catch( Throwable e ){
			  
			  Debug.out( e );
		  }
	  }
	  
	  save();
  }
  
  private void 
  notifyParameterListeners(
		String parameter) 
  {
	  	ParameterListener[] listeners;
		
		synchronized( parameterListenerz ){
			 
			 listeners = parameterListenerz.get(parameter);
		}
		
		if ( listeners == null ){
			return;
		}

		for ( ParameterListener listener: listeners ) {

			if ( listener != null ){
				
				try{
					listener.parameterChanged( parameter );
					
				}catch (Throwable e) {
					
					Debug.printStackTrace(e);
				}
			}
		}
	}

  public void 
  addParameterListener(
	String 				parameter, 
	ParameterListener 	new_listener )
  {
    if ( parameter == null || new_listener == null ){
	    	
	      return;
    }
		    
	  synchronized( parameterListenerz ){
  	
	    ParameterListener[] listeners = parameterListenerz.get( parameter );
	    
	    if ( listeners == null ){
	    		     
	    	parameterListenerz.put(parameter, new ParameterListener[]{ new_listener } );
	    	
	    }else{
	    
	    	ParameterListener[]	new_listeners = new ParameterListener[ listeners.length + 1 ];
	    	
	    	if ( Constants.IS_CVS_VERSION && listeners.length > 100 ){
	    		Debug.out( parameter );
	    	}
	    	
	    	int	pos;
	    	
	    	if ( new_listener instanceof PriorityParameterListener ){
	    		
	    		new_listeners[0] = new_listener;
	    		
	    		pos = 1;
	    		
	    	}else{
	    		
	    		new_listeners[ listeners.length ] = new_listener;
	    		
	    		pos = 0;
	    	}
	    	
	    	for ( int i=0;i<listeners.length;i++){
	    		
	    		ParameterListener existing_listener = listeners[i];
	    		
	    		if ( existing_listener == new_listener ){
	    			
	    			return;
	    		}
	    		
	    		new_listeners[pos++] = existing_listener;
	    	}
	    	
	    	if ( DEBUG_PARAMETER_LISTENERS ){
	    	
	    		System.out.println( parameter + "->" + new_listeners.length );
	    	}
	    	
	    	parameterListenerz.put( parameter, new_listeners );
	    }
  	}
  }

  public void removeParameterListener(String parameter, ParameterListener listener){
 
    if( parameter == null || listener == null ){
    	return;
    }
    
    synchronized( parameterListenerz ){
	    ParameterListener[] listeners = parameterListenerz.get( parameter );
	    
	    if ( listeners == null ){
	    	
	    	return;
	    }
	    
	    if ( listeners.length == 1 ){
	    	
	    	if ( listeners[0] == listener ){
	    		
	    		parameterListenerz.remove( parameter );
	    	}
	    }else{
	    	
	    	ParameterListener[] new_listeners = new ParameterListener[ listeners.length - 1 ];
	    	
	    	int	pos = 0;
	    	
	    	for ( int i=0;i<listeners.length;i++){
	    		
	    		ParameterListener existing_listener = listeners[i];

	    		if ( existing_listener != listener ){
	    			
	    			if ( pos == new_listeners.length ){
	    				
	    				return;
	    			}
	    			
	    			new_listeners[pos++] = existing_listener;
	    		}
	    	}
	    	
	    	if ( DEBUG_PARAMETER_LISTENERS ){
	    	
	    		System.out.println( parameter + "->" + new_listeners.length );
	    	}
	    	
	    	parameterListenerz.put( parameter, new_listeners );
	    }
    }
  }

  public void addListener(COConfigurationListener listener) {
  	synchronized( listenerz ){

  		listenerz.add(listener);
  		
  	}
  }
  public void addAndFireListener(COConfigurationListener listener) {
  	synchronized( listenerz ){

  		listenerz.add(listener);
  		
  	}
  	
		try{
	  	listener.configurationSaved();
			
		}catch( Throwable e ){
			
			Debug.printStackTrace( e );
		}
  }
  public void removeListener(COConfigurationListener listener) {
	  synchronized( listenerz ){
  	
  		listenerz.remove(listener);
  	}
  }
  
  	private boolean
  	ignoreKeyForDump(
  		String		key )
  	{
  		String	lc_key = key.toLowerCase( Locale.US );
  		
		if ( 	key.startsWith( CryptoManager.CRYPTO_CONFIG_PREFIX ) || 
				lc_key.equals( "id" ) ||
				lc_key.endsWith( ".privx" ) ||
				lc_key.endsWith( ".user" ) ||
				lc_key.contains( "password" ) ||
				lc_key.contains( "username" ) ||
				lc_key.contains( "session key" )){
			
			return( true );
		}
			
		Object	value	= propertiesMap.get(key);

		if ( value instanceof byte[] ){
			
			try{
				value = new String((byte[])value, "UTF-8" );
				
			}catch( Throwable e ){
				
			}
		}
		
		if ( value instanceof String ){
			
			if (((String)value).toLowerCase( Locale.US ).endsWith( ".b32.i2p" )){
				
				return( true );
			}
		}
		
		return( false );
  	}
  	
	public void
	generate(
		IndentWriter		writer )
	{
		writer.println( "Configuration Details" );
		
		try{
			writer.indent();
		
			writer.println( "version=" + Constants.AZUREUS_VERSION + ", subver=" + Constants.AZUREUS_SUBVER );
			
			writer.println( "System Properties" );
			
			try{
				writer.indent();
			
				Properties props = System.getProperties();
				
				Iterator	it = new TreeSet( props.keySet()).iterator();
				
				while(it.hasNext()){
					
					String	key = (String)it.next();
					
					writer.println( key + "=" + props.get( key ));
				}
			}finally{
				
				writer.exdent();
			}
			
			writer.println( "Environment" );
			
			try{
				writer.indent();
			
				Map<String,String> env = System.getenv();
				
				if ( env == null ){
					
					writer.println( "Not supported" );
					
				}else{
					
					Iterator	it = new TreeSet( env.keySet()).iterator();
					
					while(it.hasNext()){
						
						String	key = (String)it.next();
						
						writer.println( key + "=" + env.get( key ));
					}
				}
			}finally{
				
				writer.exdent();
			}
			
			writer.println( "Azureus Config" );

			ConfigurationDefaults defaults = ConfigurationDefaults.getInstance();
			
			try{
				writer.indent();
			
				Set<String> keys =
					new TreeSet<String>(
						new Comparator<String>()
						{
							public int 
							compare(
								String o1, 
								String o2) 
							{
								return( o1.compareToIgnoreCase( o2 ));
							}
						});
			
				keys.addAll( propertiesMap.keySet());
				
				Iterator<String> it = keys.iterator();
				
				while( it.hasNext()){
					
					String	key 	= it.next();
					
						// don't dump crypto stuff
					
					if ( ignoreKeyForDump( key )){
						
						continue;
					}
					
					Object	value	= propertiesMap.get(key);
					
					boolean bParamExists = defaults.doesParameterDefaultExist(key.toString());
					
					if (!bParamExists){
						
						key = "[NoDef] " + key;
					}else{
						
						Object def = defaults.getParameter( key );
						
						if ( def != null && value != null ){
							
							if ( !BEncoder.objectsAreIdentical( def, value )){
								
								key = "-> " + key;
							}
						}
					}
					
					if ( value instanceof Long ){
						
						writer.println( key + "=" + value );
						
					}else if ( value instanceof List ){
						
						writer.println( key + "=" + BDecoder.decodeStrings((List)BEncoder.clone(value)) + "[list]" );
						
					}else if ( value instanceof Map ){
						
						writer.println( key + "=" + BDecoder.decodeStrings((Map)BEncoder.clone(value)) + "[map]" );
						
					}else if ( value instanceof byte[] ){
						
						byte[]	b = (byte[])value;
					
						boolean	hex	= false;
						
						for (int i=0;i<b.length;i++){
							
							char	c = (char)b[i];
							
							if ( !	( 	Character.isLetterOrDigit(c) ||
										"\\ `¬\"£$%^&*()-_=+[{]};:'@#~,<.>/?'".indexOf(c) != -1 )){
								
								hex	= true;
								
								break;
							}
						}
						writer.println( key + "=" + (hex?ByteFormatter.nicePrint(b):bytesToString((byte[])value)));
						
					}else{
						
						writer.println( key + "=" + value + "[unknown]" );
					}
				}
			}finally{
				
				writer.exdent();
			}
		}finally{
			
			writer.exdent();
		}
	}
	
	public void
	dumpConfigChanges(
		IndentWriter	writer )
	{
		ConfigurationDefaults defaults = ConfigurationDefaults.getInstance();
		
		Set<String> keys =
			new TreeSet<String>(
				new Comparator<String>()
				{
					public int 
					compare(
						String o1, 
						String o2) 
					{
						return( o1.compareToIgnoreCase( o2 ));
					}
				});
	
		keys.addAll( propertiesMap.keySet());
		
		Iterator<String> it = keys.iterator();
		
		while( it.hasNext()){
			
			String	key 	= it.next();
			
				// don't dump crypto stuff
			
			if ( ignoreKeyForDump( key )){
				
				continue;
			}
			
			Object	value	= propertiesMap.get(key);
			
			boolean bParamExists = defaults.doesParameterDefaultExist(key.toString());
			
			if ( bParamExists ){
				
				Object def = defaults.getParameter( key );
				
				if ( def != null && value != null ){
					
					if ( !BEncoder.objectsAreIdentical( def, value )){
												
						if ( value instanceof Long ){
							
							writer.println( key + "=" + value );
							
						}else if ( value instanceof List ){
							
							writer.println( key + "=" + BDecoder.decodeStrings((List)BEncoder.clone(value)) + "[list]" );
							
						}else if ( value instanceof Map ){
							
							writer.println( key + "=" + BDecoder.decodeStrings((Map)BEncoder.clone(value)) + "[map]" );
							
						}else if ( value instanceof byte[] ){
							
							byte[]	b = (byte[])value;
						
							boolean	hex	= false;
							
							for (int i=0;i<b.length;i++){
								
								char	c = (char)b[i];
								
								if ( !	( 	Character.isLetterOrDigit(c) ||
											"\\ `¬\"£$%^&*()-_=+[{]};:'@#~,<.>/?'".indexOf(c) != -1 )){
									
									hex	= true;
									
									break;
								}
							}
							writer.println( key + "=" + (hex?ByteFormatter.nicePrint(b):bytesToString((byte[])value)));
							
						}else{
							
							writer.println( key + "=" + value + "[unknown]" );
						}
					}
				}
			}
		}
	}
		
	protected static String
	bytesToString(
		byte[]	bytes )
	{
		try{
			return( new String( bytes, Constants.DEFAULT_ENCODING ));
			
		}catch( Throwable e ){
			
			return( new String(bytes));
		}
	}
	
	protected static byte[]
	stringToBytes(
		String	str )
	{
		if ( str == null ){
			
			return( null );
		}
		
		try{
			return( str.getBytes( Constants.DEFAULT_ENCODING ));
			
		}catch( Throwable e ){
			
			return( str.getBytes());
		}
	}
	
}