/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.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;

import java.awt.CardLayout;
import java.awt.Component;
import java.awt.Dialog;
import java.awt.Frame;
import java.util.Map;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import com.rapidminer.gui.tools.ResourceAction;

/**
 * 
 * @author Tobias Malbrecht
 */
public abstract class MultiPageDialog extends ButtonDialog implements ChangeListener {

	private static final long serialVersionUID = 1L;

	private int currentStep;

	//private CardLayout cardLayout;	
	private JPanel cardPanel;
	
	private final JButton previous = new JButton(new ResourceAction("previous") {
		private static final long serialVersionUID = 1L;
		public void actionPerformed(java.awt.event.ActionEvent e) {
			previous();
		}			
	});
	private final JButton next = new JButton(new ResourceAction("next") {
		private static final long serialVersionUID = 1L;
		public void actionPerformed(java.awt.event.ActionEvent e) {
			next();
		}
	});
	private final JButton finish = new JButton(new ResourceAction("finish") {			
		private static final long serialVersionUID = 1L;
		public void actionPerformed(java.awt.event.ActionEvent e) {
			finish();
		}
	});
	public MultiPageDialog(Dialog owner, String key, boolean modal, Object... arguments) {
		super(key, modal, arguments);
	}

	public MultiPageDialog(Dialog owner, String key, Object... arguments) {
		super(key, arguments);
	}

	public MultiPageDialog(Frame owner, String key, boolean modal, Object... arguments) {
		super(key, modal, arguments);
	}

	public MultiPageDialog(Frame owner, String key, Object... arguments) {
		super(key, arguments);
	}

	protected abstract boolean isComplete();
	
	protected abstract boolean isLastStep(int step);
	
	protected abstract String getNameForStep(int step);
	
	protected boolean canProceed(int step) {
		return true;
	}
	
	protected boolean canGoBack(int step) {
		return true;
	}
	
	protected void layoutDefault(Map<String, Component> cards) {
		layoutDefault(cards, DEFAULT_SIZE);
	}
	
	/** @param cards Maps arbitrary names to GUI cards. The name for the current component is looked up
	 *   by using {@link #getNameForStep(int)} as a key into this map. This is useful, if we do not have
	 *   a linear order of cards. */
	protected void layoutDefault(Map<String,Component> cards, int size) {
		cardPanel = new JPanel(new CardLayout());
		//cardLayout = new CardLayout();
		//cardPanel.setLayout(cardLayout);
		for (Map.Entry<String, Component> entry : cards.entrySet()) {
			//cardLayout.addLayoutComponent(entry.getValue(), entry.getKey());
			cardPanel.add(entry.getValue(), entry.getKey());
		}
		showCurrent();
		super.layoutDefault(cardPanel, size, previous, next, finish, makeCancelButton());		
	}

	protected int getCurrentStep() {
		return currentStep;
	}
	
	private void showCurrent() {
		updateButtons();

		if (isLastStep(currentStep)) {
			getRootPane().setDefaultButton(finish);
		} else {
			getRootPane().setDefaultButton(next);
		}
		
		String key = getNameForStep(getCurrentStep());
		CardLayout cl = (CardLayout)(cardPanel.getLayout());
	    cl.show(cardPanel, key);
	}

	protected void finish() {
		wasConfirmed = true;
		dispose();
	}

	protected void previous() {		
		currentStep--;		
		showCurrent();
	}

	protected void next() {
		currentStep++;
		showCurrent();
	}
	
	private void updateButtons() {
		previous.setEnabled(currentStep > 0 && canGoBack(currentStep));
		next.setEnabled(!isLastStep(currentStep) && canProceed(currentStep));
		finish.setEnabled(isComplete() && canProceed(currentStep));
	}
	
	public void stateChanged(ChangeEvent e) {
		updateButtons();
	}
}