/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.refactoring.ui;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Action;
import javax.swing.SwingUtilities;
import org.netbeans.modules.javacore.internalapi.JavaMetamodel;
import org.netbeans.modules.javacore.internalapi.UndoManager;
import org.openide.util.HelpCtx;
import org.openide.util.NbBundle;
import org.openide.util.actions.CallableSystemAction;

public class UndoAction extends CallableSystemAction implements PropertyChangeListener {
    
    private UndoManager undoManager;
    
    public UndoAction() {
        putValue(Action.NAME, getString("LBL_Undo")); //NOI18N
        undoManager = JavaMetamodel.getUndoManager();
        undoManager.addPropertyChangeListener(this);
        updateState();
    }
    
    public void propertyChange (PropertyChangeEvent event) {
        updateState();
    }
    
    private void updateState() {
        String desc = undoManager.getUndoDescription();
        String name = getString("LBL_Undo"); //NOI18N
        if (desc != null) {
            name += " [" + desc + "]"; //NOI18N
        }

        final String n = name;
        Runnable r = new Runnable() {
            public void run() {
                setEnabled(undoManager.isUndoAvailable());
                putValue(Action.NAME, n);
            }
        };

        if (SwingUtilities.isEventDispatchThread()) {
            r.run();
        } else {
            SwingUtilities.invokeLater(r);
        }
    }
    
    private static final String getString(String key) {
        return NbBundle.getMessage(UndoAction.class, key);
    }
    
    public void performAction() {
        undoManager.undo();
        undoManager.saveAll();
    }
    
    public org.openide.util.HelpCtx getHelpCtx() {
        return HelpCtx.DEFAULT_HELP;
    }
    
    public String getName() {
        return (String) getValue(Action.NAME);
    }

//    protected String iconResource () {
//        return "org/openide/resources/actions/undo.gif"; // NOI18N
//    }

}