/*
 * File    : FileChooserForFiles.java
 * Created : 18-apr-2002 16:43
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya
 *
 * 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 (see the LICENSE file).
 */

package edu.xtec.util;

import java.io.File;
import java.lang.reflect.Method;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileSystemView;
import javax.swing.plaf.FileChooserUI;
import javax.swing.plaf.metal.MetalFileChooserUI;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.cat)
 * @version 13.09.10
 */
public class FileChooserForFiles extends JFileChooser{
    
    /** Creates new FileChooserForFiles */
    public FileChooserForFiles(){
        setFileSelectionMode(JFileChooser.FILES_ONLY);
    }
    
    public FileChooserForFiles(File file) {
        super(file);
        setFileSelectionMode(JFileChooser.FILES_ONLY);
    }
    
    public FileChooserForFiles(File currentDirectory, FileSystemView fsv) {
        super(currentDirectory, fsv);
        setFileSelectionMode(JFileChooser.FILES_ONLY);
    }
    
    public FileChooserForFiles(FileSystemView fsw) {
        super(fsw);
        setFileSelectionMode(JFileChooser.FILES_ONLY);
    }
    
    public FileChooserForFiles(String file) {
        super(file);
        setFileSelectionMode(JFileChooser.FILES_ONLY);
    }
    
    public FileChooserForFiles(String currentDirectory, FileSystemView fsv) {
        super(currentDirectory, fsv);
        setFileSelectionMode(JFileChooser.FILES_ONLY);
    }
    
    @Override
    public void setCurrentDirectory(final File dir) {
        final String oldFileName = getCurrentFileName();
        super.setCurrentDirectory(dir);
        
        // TODO: interpret oldFilename for multiselection
        if (oldFileName != null && oldFileName.indexOf('"')== -1) {
            if (getCurrentFileName() == null) {
                setSelectedFile(new File(dir, oldFileName));
            }
        }
    }
    
    static Class<?> WindowsFileChooserUIClass;
    static Method getFileNameMethod;
    static{
        try{
            // 03-Apr-2008: Perform a previous check of the class as resource in order to avoid
            // uncatchable exceptions in applets
            if(FileChooserForFiles.class.getResource("/com/sun/java/swing/plaf/windows/WindowsFileChooserUI.class")!=null){
                WindowsFileChooserUIClass=Class.forName("com.sun.java.swing.plaf.windows.WindowsFileChooserUI");
                if(WindowsFileChooserUIClass!=null){
                    getFileNameMethod=WindowsFileChooserUIClass.getMethod("getFileName", (Class[])null);
                }
            }
        } catch(Exception ex){
            // Class not found: ignore
        }
    }
    
    /** JDKBUG: get current selected filename. */
    private String getCurrentFileName() {
        final FileChooserUI fchui = getUI();
        String fileName;
        if (fchui instanceof MetalFileChooserUI) {
            fileName = ((MetalFileChooserUI)fchui).getFileName();
        }
        else if(WindowsFileChooserUIClass!=null && WindowsFileChooserUIClass.isInstance(fchui) && getFileNameMethod!=null) {
            try{
                fileName = (String)getFileNameMethod.invoke(fchui, (Object[])null);
            } catch(Exception ex){
                fileName=null;
            }
        }
        else {
            fileName = null;
        }
        return fileName == null || fileName.trim().length()== 0 ? null : fileName;
    }
    
    
    public void directSetSelectedFile(final File selectedFile){
        super.setSelectedFile(selectedFile);
        
    }
    
    /** JDKBUG: avoid unsetting filename when a directory is selected. */
    @Override
    public void setSelectedFile(final File selectedFile) {
        if (selectedFile != null) {
            if ((selectedFile.isDirectory() && isDirectorySelectionEnabled())
            || (!selectedFile.isDirectory() && isFileSelectionEnabled())) {
                super.setSelectedFile(selectedFile);
            }
        }
    }
}