/*  Copyright (C) 2012 JabRef contributors.
    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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package net.sf.jabref.specialfields;

import java.awt.Dimension;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

import com.jgoodies.looks.HeaderStyle;
import com.jgoodies.looks.Options;

import net.sf.jabref.BasePanel;
import net.sf.jabref.Globals;
import net.sf.jabref.JabRefFrame;

public class SpecialFieldDropDown {
	
	public static JButton generateSpecialFieldButtonWithDropDown(SpecialField field, JabRefFrame frame) {
		Dimension buttonDim = new Dimension(23,23);
		JButton button = new JButton(field.getRepresentingIcon());
		button.setToolTipText(field.getToolTip());
		button.setPreferredSize(buttonDim);
		if (!Globals.ON_MAC)
			button.setMargin(new Insets(1, 0, 2, 0));
		button.setBorder(null);
		button.setBorderPainted(false);
		button.setRolloverEnabled(true);
		button.setOpaque(false);
		button.setBounds(0, 0, buttonDim.width, buttonDim.height);
		button.setSize(buttonDim);
		button.setMinimumSize(buttonDim);
		button.setMaximumSize(buttonDim);
		button.putClientProperty(Options.HEADER_STYLE_KEY, HeaderStyle.BOTH);
		button.addActionListener(new MenuButtonActionListener(field, frame, button, buttonDim));
		return button;
	}
	
	private static class MenuButtonActionListener implements ActionListener {

		private JPopupMenu popup;
		private Dimension dim;
		private JabRefFrame frame;
		private SpecialField field;
		private JButton button;

		public MenuButtonActionListener(SpecialField field, JabRefFrame frame, JButton button, Dimension dim) {
			this.field = field;
			this.dim = dim;
			this.frame = frame;
			this.button = button;
		}

		public void actionPerformed(ActionEvent e) {
			if (popup == null) {
				popup = new JPopupMenu();
				for (SpecialFieldValue val: field.getValues()) {
					JMenuItem item = new JMenuItem(val.getIcon());
					item.setText(val.getMenuString());
					item.setToolTipText(val.getToolTipText());
					item.addActionListener(new PopupitemActionListener(frame.basePanel(), val.getActionName()));
					item.setMargin(new Insets(0,0,0,0));
					popup.add(item);
				}
			}
			popup.show(button, 0, dim.height);
		}

		private class PopupitemActionListener implements ActionListener {

			private BasePanel panel;
			private String actionName;

			public PopupitemActionListener(BasePanel panel, String actionName) {
				this.panel = panel;
				this.actionName = actionName;
			}

			public void actionPerformed(ActionEvent e) {
				panel.runCommand(actionName);
				popup.setVisible(false);
			}

		}

	}

}