/*
    *  XNap - A P2P framework and client.
    *
    *  See the file AUTHORS for copyright information.
    *
    *  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.
    *
   *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.xnap.gui.component;
  
  import java.awt.BorderLayout;
  import java.awt.CardLayout;
  import java.awt.Color;
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.Font;
  import java.awt.event.ActionEvent;
  import java.util.Iterator;
  import java.util.LinkedList;
  
  import javax.swing.AbstractAction;
  import javax.swing.Action;
  import javax.swing.BorderFactory;
  import javax.swing.JButton;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.SwingConstants;
  import javax.swing.border.EmptyBorder;
  
  import org.xnap.XNap;
  import org.xnap.gui.Dialogs;
  import org.xnap.gui.SettingsPanel;
  import org.xnap.gui.util.IconHelper;
  
  public class DefaultWizardDialog extends DefaultDialog
  {
  
      //--- Constant(s) ---
  
      //--- Data field(s) ---
  
  	private JLabel jlTitle;
  	private JLabel jlIcon;
  	private MultiLineLabel jtaDescription;
      
      private JPanel ctPanels;
      private CardLayout clPanels;
  
      private LinkedList panels = new LinkedList();
      private int selectedIndex = 0;
  
      private JButton jbNext;
      private JButton jbFinish;
  
      private PreviousAction acPrevious = new PreviousAction();
      private NextAction acNext = new NextAction();
      private FinishAction acFinish = new FinishAction();
  
      //--- Constructor(s) ---
  
      public DefaultWizardDialog(int buttons)
      {
  		super(buttons);
  
  		// top
  		JPanel jpTop = new JPanel(new BorderLayout());
  		jpTop.setBackground(Color.white);
  		jpTop.setBorder(BorderFactory.createEtchedBorder());
  		getContentPane().add(jpTop, BorderLayout.NORTH);
  
  		JPanel jpTitle = new JPanel(new BorderLayout());
  		jpTitle.setBackground(Color.white);
  		jpTop.add(jpTitle, BorderLayout.CENTER);
  		
  		jlTitle = new JLabel(" ");
  		jlTitle.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
  		jlTitle.setFont(new Font("Dialog", Font.BOLD, 16));
  		jlTitle.setForeground(Color.black);
  		jpTitle.add(jlTitle, BorderLayout.NORTH);
  
  		jtaDescription = new MultiLineLabel(" ");
  		jtaDescription.setBackground(Color.white);
  		jtaDescription.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
  		jtaDescription.setForeground(Color.black);
  		jpTitle.add(jtaDescription, BorderLayout.CENTER);
  
  		jlIcon = new JLabel();
  		jlIcon.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
 		jpTop.add(jlIcon, BorderLayout.EAST);
 
 		// center
 		clPanels = new CardLayout();
 		ctPanels = new JPanel();
 		ctPanels.setBorder(new EmptyBorder(5, 5, 5, 5));
 		ctPanels.setLayout(clPanels);
 
 		// bottom
 		JPanel jpButtons = getButtonPanel();
 
 		jpButtons.add(new XNapButton(acPrevious), 0);
 
 		jbNext = new XNapButton(acNext);
 		jbNext.setHorizontalTextPosition(SwingConstants.LEFT);
 		jpButtons.add(jbNext, 1);
 
 		jbFinish = new XNapButton(acFinish);
 		jpButtons.add(jbFinish, 2);
 
 		// set me up
 		setMainComponent(ctPanels);
 		setSize(640, 480);
     }
 
 	public DefaultWizardDialog()
 	{
 		this(BUTTON_CANCEL);
 	}
 
     //--- Method(s) ---
 
     public void addPanel(SettingsPanel panel)
     {
 		ctPanels.add(panel.getPanel(), panel.getTitle());
 		panels.add(panel);
 		updatePanel(0);
     }
 
 	public void finish()
 	{
 		boolean canClose = true;
 		for (Iterator i = panels.iterator(); i.hasNext();) {
 			try {
 				((SettingsPanel)i.next()).apply();
 			}
 			catch (Exception e) {
 				canClose = false;
 				Dialogs.error(this, e.toString());
 			}
 		}
 		
 		if (canClose) {
 			isOkay = true;
 			close();
 		}
 	}
 
 	public Action getFinishAction()
 	{
 		return acFinish;
 	}
 
 	public Action getNextAction()
 	{
 		return acNext;
 	}
 
 	public int getSelectedIndex()
 	{
 		return selectedIndex;
 	}
 
 	public SettingsPanel getSelectedPanel()
 	{
 		return (SettingsPanel)panels.get(getSelectedIndex());
 	}
 
 	/***
 	 * Invoked when the user presses next or previous. 
 	 *
 	 * <p>Sub classes can overwrite this method.
 	 */
 	protected void panelChanged(SettingsPanel panel)
 	{
 	}
 
     private void updateActions()
     {
 		acPrevious.setEnabled(selectedIndex > 0);
 		acNext.setEnabled(selectedIndex < panels.size() - 1);
 		if (acNext.isEnabled()) {
 			jbNext.requestFocus();
 		}
 		else {
 			jbFinish.requestFocus();
 		}
     }
 
 	private void updatePanel(int index) 
 	{
 		if (index == 1) {
 			clPanels.next(ctPanels);
 		}
 		else if (index == -1) {
 			clPanels.previous(ctPanels);
 		}
 		else if (index != 0) {
 			// this should never happen
 			return;
 		}
 		
 		selectedIndex += index;
 		updateActions();
 
 		// update top
 		SettingsPanel panel = getSelectedPanel();
 		jlTitle.setText(panel.getTitle());
 		jlIcon.setIcon(panel.getIcon());
 		jtaDescription.setText(panel.getDescription());
 		if (index != 0 || (selectedIndex == 0 && index == 0)) {
 			panelChanged(panel);
 		}
 	}
 
     public class PreviousAction extends AbstractAction {
 	
 		public PreviousAction()
 		{
 			putValue(Action.NAME, XNap.tr("Previous"));
 			putValue(IconHelper.XNAP_ICON, "1leftarrow.png");
             putValue(Action.SHORT_DESCRIPTION,
 					 XNap.tr("Goes to previous page."));
         }
 
         public void actionPerformed(ActionEvent event) 
 		{
 			updatePanel(-1);
         }
 
     }
 
     public class NextAction extends AbstractAction {
 	
 		public NextAction()
 		{
 			putValue(Action.NAME, XNap.tr("Next"));
 			putValue(IconHelper.XNAP_ICON, "1rightarrow.png");
             putValue(Action.SHORT_DESCRIPTION, XNap.tr("Goes to next page."));
         }
 
         public void actionPerformed(ActionEvent event) 
 		{
 			updatePanel(1);
         }
 
     }
 
     public class FinishAction extends AbstractAction {
 	
 		public FinishAction()
 		{
 			putValue(Action.NAME, XNap.tr("Finish"));
             putValue(Action.SHORT_DESCRIPTION, 
 					 XNap.tr("Closes the dialog saving changes."));
         }
 
         public void actionPerformed(ActionEvent event) 
 		{
 			finish();
         }
 
     }
 
     protected class PContainer extends JPanel
     {
 		Dimension maxDim = new Dimension(0, 0);
 
 		public void add(Component comp, Object constraints) 
 		{
 			Dimension d = comp.getPreferredSize();
 			if (d.height > maxDim.height) {
 				maxDim.height = d.height;
 			}
 			if (d.width > maxDim.width) {
 				maxDim.width = d.width;
 			}
 
 			super.add(comp, constraints);
 		}
 
 		public Dimension getPreferredSize()
 		{
 			// looks like the height is too small
 			return new Dimension(maxDim.width + 10, maxDim.height + 30);
 		}
     }
 
 }