/*
 * Created on 29-Oct-2004
 * Created by Paul Gardner
 * Copyright (C) 2004, 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 org.gudy.azureus2.core3.util;

import java.io.File;
import java.io.IOException;


/**
 * @author parg
 *
 */

public class 
AETemporaryFileHandler 
{
    private static final boolean PORTABLE = System.getProperty( "azureus.portable.root", "" ).length() > 0;

	private static final String	PREFIX = "AZU";
	private static final String	SUFFIX = ".tmp";
	
	private static boolean	started_up;
	private static File		tmp_dir;

	public static synchronized void
	startup()
	{
		if ( started_up ){
			
			return;
		}
		
		started_up	= true;
		
		try{
			tmp_dir		= FileUtil.getUserFile( "tmp" );
						
			if ( tmp_dir.exists()){
				
				File[]	files = tmp_dir.listFiles();
				
				if ( files != null ){
					
					for (int i=0;i<files.length;i++){
						
						File	file = files[i];
						
						if ( file.getName().startsWith(PREFIX) && file.getName().endsWith(SUFFIX)){
						
							if ( file.isDirectory()){
							
								FileUtil.recursiveDelete( file );
								
							}else{
							
								file.delete();
							}
						}
					}
				}
			}else{
				
				tmp_dir.mkdir();
			}
			
		}catch( Throwable e ){
			
			try{
				tmp_dir = File.createTempFile(PREFIX,SUFFIX).getParentFile();
			
			}catch( Throwable f ){
				
				tmp_dir = new File("");
			}
			
				// with webui we don't have the file stuff so this fails with class not found
			
			if ( !(e instanceof NoClassDefFoundError )){
				
				Debug.printStackTrace( e );
			}
		}
	}
	
	public static File
	getTempDirectory()
	{
		startup();

		return( tmp_dir );
	}
	
	public static boolean
	isTempFile(
		File		file )
	{
		if ( !file.exists()){
			
			return( false );
		}
		
		try{
			String s1 = file.getParentFile().getCanonicalPath();
			String s2 = tmp_dir.getCanonicalPath();
			
			if ( !s1.equals(s2)){
				
				return( false );
			}
			
			String	name = file.getName();
			
			if ( !name.startsWith( PREFIX )){
				
				return( false );
			}
			
			if ( !name.endsWith( SUFFIX )){
				
				return( false );
			}
			
			return( true );
			
		}catch( Throwable e ){
			
			Debug.out( e );
			
			return( false );
		}
	}
	
	public static File 
	createTempFile()
	
		throws IOException
	{
		startup();
		
		return( File.createTempFile( PREFIX, SUFFIX, tmp_dir ));
	}
	
	public static File
	createSemiTempFile()
	
		throws IOException
	{
		if ( PORTABLE ){
			
			try{
				File stmp_dir = FileUtil.getUserFile( "tmp2" );
	
				if ( !stmp_dir.exists()){
					
					stmp_dir.mkdirs();
				}
				
				if ( stmp_dir.canWrite()){
					
					return( File.createTempFile( PREFIX, null, stmp_dir ));
				}
			}catch( Throwable e ){
				
				Debug.out( e );
			}
		}
		
		return( File.createTempFile( PREFIX, null ));
	}
	
	public static File 
	createTempDir()
	
		throws IOException
	{
		startup();
		
		for (int i=0;i<16;i++){
			
			File f = File.createTempFile( PREFIX, SUFFIX, tmp_dir );
			
			f.delete();
			
			if ( f.mkdirs()){
				
				return( f );
			}
		}
		
		throw( new IOException( "Failed to create temporary directory in " + tmp_dir ));
	}
}
