/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 by RapidMiner and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapidminer.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.tools.dialogs.wizards.dataimport;

import java.io.File;

import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

import com.rapidminer.gui.tools.ExtendedJFileChooser;
import com.rapidminer.gui.tools.SwingTools;
import com.rapidminer.gui.tools.dialogs.wizards.AbstractWizard;
import com.rapidminer.gui.tools.dialogs.wizards.WizardStep;

/**
 * 
 * @author Tobias Malbrecht
 */
public class FileSelectionWizardStep extends WizardStep {

	protected final JFileChooser fileChooser;
	
	public FileSelectionWizardStep(AbstractWizard parent, FileFilter ... fileFilters) {
		this(parent, (File)null, fileFilters);
		setDefaultFileFilter(fileChooser, fileFilters);
	}
	
	public FileSelectionWizardStep(AbstractWizard parent, File preselected, FileFilter ... fileFilters) {
		super("select_file");
		this.fileChooser = SwingTools.createFileChooser("", null, false, fileFilters);
		if (preselected != null) {
			this.fileChooser.setSelectedFile(preselected);
		}
		this.fileChooser.setControlButtonsAreShown(false);
		setDefaultFileFilter(fileChooser, fileFilters);
		if (this.fileChooser instanceof ExtendedJFileChooser) {
			((ExtendedJFileChooser) fileChooser).addChangeListener(parent);
		}
	}
	
	private void setDefaultFileFilter(JFileChooser fileChooser, FileFilter... fileFilters) {
		if (fileFilters!=null && fileFilters.length==1) {
			// Select single file filter as default
			fileChooser.setFileFilter(fileFilters[0]);
			fileChooser.setAcceptAllFileFilterUsed(true);
		}
	}
	
	@Override
	protected boolean canGoBack() {
		return false;
	}

	@Override
	protected boolean canProceed() {
		if (fileChooser instanceof ExtendedJFileChooser) {
			File selectedFile = getSelectedFile();
			return selectedFile != null && selectedFile.exists();
		}
		return true;
	}

	@Override
	protected JComponent getComponent() {
		return fileChooser;
	}
	
	public File getSelectedFile() {
		return fileChooser.getSelectedFile();
	}
}