/*
 *  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.components;

import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JToolBar;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;

import com.rapidminer.gui.tools.ArrowButton;
import com.rapidminer.gui.tools.ViewToolBar;
import com.vlsolutions.swing.toolbars.VLToolBar;


/**
 * 
 * @author Tobias Malbrecht
 */
public abstract class DropDownButton extends JButton { 

	private static final long serialVersionUID = -5987392204641149649L;

	private final PopupMenuListener popupMenuListener = new PopupMenuListener() {
		public void popupMenuWillBecomeVisible(PopupMenuEvent e){ 
			popupVisible = true; 
			mainButton.getModel().setRollover(true); 
			arrowButton.getModel().setSelected(true); 
		} 

		public void popupMenuWillBecomeInvisible(PopupMenuEvent e){ 
			popupVisible = false; 

			mainButton.getModel().setRollover(false); 
			arrowButton.getModel().setSelected(false); 
			((JPopupMenu)e.getSource()).removePopupMenuListener(this); // act as good programmer :)
		} 

		public void popupMenuCanceled(PopupMenuEvent e){ 
			popupVisible = false; 
		} 
	};

	private final ChangeListener changeListener = new ChangeListener() {
		public void stateChanged(ChangeEvent e){ 
			if(e.getSource()==mainButton.getModel()){ 
				if(popupVisible && !mainButton.getModel().isRollover()){ 
					mainButton.getModel().setRollover(true); 
					return; 
				} 
				arrowButton.getModel().setRollover(mainButton.getModel().isRollover()); 
				arrowButton.setSelected(mainButton.getModel().isArmed() && mainButton.getModel().isPressed()); 
			} else{ 
				if(popupVisible && !arrowButton.getModel().isSelected()){ 
					arrowButton.getModel().setSelected(true); 
					return; 
				} 
				mainButton.getModel().setRollover(arrowButton.getModel().isRollover()); 
			} 
		}
	};

	private JButton mainButton = this;
	
	public static class DropDownArrowButton extends ArrowButton {
		private static final long serialVersionUID = -398619111521186260L;

		public DropDownArrowButton() {
			super(SwingConstants.SOUTH);
		}
	}

	private final ArrowButton arrowButton = new DropDownArrowButton();

	private boolean popupVisible = false; 

	public DropDownButton(Action action){
		super(action);
		mainButton.setText(null);
		mainButton.setOpaque(false);
		mainButton.setBorderPainted(false);
		mainButton.setMargin(new Insets(0,0,0,0));
		mainButton.getModel().addChangeListener(changeListener);
		arrowButton.getModel().addChangeListener(changeListener);
		arrowButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae){ 
				JPopupMenu popup = getPopupMenu(); 
				popup.addPopupMenuListener(popupMenuListener); 
				popup.show(mainButton, 0, mainButton.getHeight()); 
			}		
		}); 
		arrowButton.setMargin(new Insets(0, 0, 0, 0)); 
		mainButton.addPropertyChangeListener("enabled", new PropertyChangeListener() {
			public void propertyChange(PropertyChangeEvent evt){ 
				arrowButton.setEnabled(mainButton.isEnabled()); 
			} 
		}); 
	}

	protected abstract JPopupMenu getPopupMenu();
	
	public void add(Action action) {
		getPopupMenu().add(action);
	}
	
	public void add(JMenuItem item) {
		getPopupMenu().add(item);
	}

	public JButton addToToolBar(JToolBar toolbar){ 
		toolbar.add(mainButton); 
		toolbar.add(arrowButton); 
		return mainButton; 
	}

	public JButton addToToolBar(VLToolBar toolbar) {
		toolbar.add(mainButton); 
		toolbar.add(arrowButton); 
		return mainButton;		
	}
	
	public JButton addToToolBar(ViewToolBar toolbar, int alignment) {
		toolbar.add(mainButton, alignment);
		toolbar.add(arrowButton, alignment);
		return mainButton;
	}
	
	public JButton addToFlowLayoutPanel(JPanel panel) {
		panel.add(mainButton);
		panel.add(arrowButton);
		return mainButton;
	}
	
	public JButton addArrowToFlowLayoutPanel(JPanel panel) {
		//mainButton.setVisible(false);
		panel.add(mainButton);
		panel.add(arrowButton);
		return mainButton;
	}

	// factory methods
	public static DropDownButton makeDropDownButton(Action mainAction, Action ... actions) {
		final JPopupMenu menu = new JPopupMenu();
		for (Action action : actions) {
			menu.add(action);
		}		
		return new DropDownButton(mainAction) {
			private static final long serialVersionUID = -7359018188605409766L;

			@Override
			protected JPopupMenu getPopupMenu() {
				return menu;
			}
		};
	}

	public static DropDownButton makeDropDownButton(Action action) {
		final JPopupMenu menu = new JPopupMenu();
		return new DropDownButton(action) {
			private static final long serialVersionUID = -7359018188605409766L;

			@Override
			protected JPopupMenu getPopupMenu() {
				return menu;
			}
		};
	}
}