// **********************************************************************
//
// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
package IceGridGUI;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.*;
import javax.swing.border.AbstractBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.plaf.SplitPaneUI;
import javax.swing.plaf.basic.BasicSplitPaneUI;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;

import com.jgoodies.looks.Options;
import com.jgoodies.looks.plastic.PlasticLookAndFeel;
import com.jgoodies.looks.windows.WindowsLookAndFeel;
import com.jgoodies.forms.factories.Borders;

import IceGrid.*;
import IceGridGUI.Application.Editor;
import IceGridGUI.Application.Root;
import IceGridGUI.Application.TreeNode;

public class ApplicationPane extends JSplitPane implements Tab
{
    public void updateUI()
    {
	super.updateUI();
	setEmptyDividerBorder();
    }
    
    public void selected()
    {
	Coordinator c = _root.getCoordinator();

	c.getCloseApplicationAction().setEnabled(true);

	c.getSaveAction().setEnabled(_root.needsSaving() && (_root.isLive() && c.connectedToMaster() || _root.hasFile()));
	c.getDiscardUpdatesAction().setEnabled(_root.needsSaving() && (_root.isLive() || _root.hasFile()));

	if(_root.isLive())
	{
	    c.getSaveToRegistryAction().setEnabled(_root.needsSaving() && c.connectedToMaster());
	}
	else
	{
	    c.getSaveToRegistryAction().setEnabled(c.connectedToMaster());
	}
	c.getSaveToFileAction().setEnabled(true);

	
	c.getBackAction().setEnabled(_previousNodes.size() > 0);
	c.getForwardAction().setEnabled(_nextNodes.size() > 0);
	c.showActions(_currentNode);
    }

    public void refresh()
    {
	if(_currentNode != null)
	{
	    _currentEditor = _currentNode.getEditor();
	    if(_root.getCoordinator().getCurrentTab() == this)
	    {
		//
		// Refresh actions as well
		//
		_root.getCoordinator().showActions(_currentNode);
	    }
	}
    }

    public void showNode(TreeNodeBase node)
    {
	TreeNode newNode = (TreeNode)node;
	
	if(newNode != _currentNode)
	{
	    if(_currentNode != null 
	       && _currentNode.isEphemeral() && _root.hasNode(_currentNode))
	    {
		_currentNode.destroy();
		_currentNode = null;
	    }

	    if(newNode == null)
	    {
		_currentNode = null;
		showCurrentNode();
	    }
	    else
	    {
		if(_currentNode != null && _root.hasNode(_currentNode))
		{
		    _previousNodes.add(_currentNode);
		    while(_previousNodes.size() >= HISTORY_MAX_SIZE)
		    {
			_previousNodes.removeFirst();
		    }
		    _root.getCoordinator().getBackAction().setEnabled(true);
		}   
		_nextNodes.clear();
		_root.getCoordinator().getForwardAction().setEnabled(false);
		_currentNode = newNode;
		showCurrentNode();
	    }
	}
	else
	{
	    _currentEditor = _currentNode.getEditor();
	    if(_root.getCoordinator().getCurrentTab() == this)
	    {
		//
		// Refresh actions as well
		//
		_root.getCoordinator().showActions(_currentNode);
	    }
	}
    }

    public void back()
    {
	//
	// Auto-apply changes
	//
	if(_currentEditor != null && !_currentEditor.save(false))
	{
	    return;
	}

	TreeNode previousNode = null;
	do
	{
	    previousNode = (TreeNode)_previousNodes.removeLast();
	} while(_previousNodes.size() > 0 
		&& (previousNode == _currentNode || !_root.hasNode(previousNode)));
		
	if(_previousNodes.size() == 0)
	{
	    _root.getCoordinator().getBackAction().setEnabled(false);
	}

	if(previousNode != _currentNode)
	{
	    if(_currentNode != null)
	    {
		_nextNodes.addFirst(_currentNode);
		_root.getCoordinator().getForwardAction().setEnabled(true);
	    }
	    
	    _currentNode = previousNode;
	    _root.disableSelectionListener();
	    _root.setSelectedNode(_currentNode);
	    _root.enableSelectionListener();
	    showCurrentNode();
	}
    }

    public void forward()
    {
	if(_currentEditor != null && !_currentEditor.save(false))
	{
	    return;
	}

	TreeNode nextNode = null;
	do
	{
	    nextNode = (TreeNode)_nextNodes.removeFirst();
	} while(_nextNodes.size() > 0 
		&& (nextNode == _currentNode || !_root.hasNode(nextNode)));
	
	if(_nextNodes.size() == 0)
	{
	    _root.getCoordinator().getForwardAction().setEnabled(false);
	}

	if(nextNode != _currentNode)
	{
	    if(_currentNode != null)
	    {
		_previousNodes.add(_currentNode);
		_root.getCoordinator().getBackAction().setEnabled(true);
	    }
	    
	    _currentNode = nextNode;
	    _root.disableSelectionListener();
	    _root.setSelectedNode(_currentNode);
	    _root.enableSelectionListener();
	    showCurrentNode();
	}
    }

    public Root getRoot()
    {
	return _root;
    }

    //
    // E.g. to replace an ephemeral root
    //
    public void setRoot(Root newRoot)
    {
	boolean reset = (_root != null);

	if(reset)
	{
	    ToolTipManager.sharedInstance().unregisterComponent(_root.getTree());
	    _currentNode = null;
	    _previousNodes.clear();
	    _nextNodes.clear();
	}

	_root = newRoot;
	_root.setPane(this);
	
	//
	// Tree display
	//
	TreeCellRenderer renderer = new CellRenderer();
	PopupListener popupListener = new PopupListener();

	JTree tree = _root.getTree();

	tree.setBorder(new EmptyBorder(5, 5, 5, 5));
	tree.setCellRenderer(renderer);
	ToolTipManager.sharedInstance().registerComponent(tree);
	tree.addMouseListener(popupListener);

	tree.getSelectionModel().setSelectionMode
	    (TreeSelectionModel.SINGLE_TREE_SELECTION);

	tree.addTreeSelectionListener(new SelectionListener());

	tree.setRootVisible(true);

	JScrollPane leftScroll = 
	    new JScrollPane(tree,
			    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, 
			    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
	leftScroll.setBorder(Borders.EMPTY_BORDER);

	_leftPane.setContent(leftScroll);

	if(reset)
	{
	    _root.getCoordinator().getMainPane().resetIcon(_root);
	    _leftPane.validate();
	    _leftPane.repaint();
	}
    }

    public void save()
    {
	if(_currentEditor == null || _currentEditor.save(true))
	{
	    _root.save();
	}
    }
    public void saveToRegistry()
    {
	if(_currentEditor == null || _currentEditor.save(true))
	{
	    _root.saveToRegistry();
	}
    }
    public void saveToFile()
    {
	if(_currentEditor == null || _currentEditor.save(true))
	{
	    _root.saveToFile();
	}
    }
    public void discardUpdates()
    {
	_root.discardUpdates();
    }
    public boolean close()
    {
	_root.getCoordinator().getMainPane().remove(this);
	return true;
    }

    public boolean applyUpdates(boolean refresh)
    {
	if(_currentEditor == null)
	{
	    return true;
	}
	else
	{
	    return _currentEditor.save(refresh);
	}
    }

    private void registerAction(Coordinator c, int index)
    {
	Action action = c.getActionsForMenu().get(index);

	javax.swing.ActionMap am = _leftPane.getActionMap();
	javax.swing.InputMap im = _leftPane.getInputMap();

	im.put((KeyStroke)action.getValue(Action.ACCELERATOR_KEY), (String)action.getValue(Action.NAME));
	am.put((String)action.getValue(Action.NAME), action);
    }


    ApplicationPane(Root root)
    {
	super(JSplitPane.HORIZONTAL_SPLIT, true);
	setBorder(new EmptyBorder(10, 10, 10, 10));
	
	_leftPane = new SimpleInternalFrame("Descriptors");
	_leftPane.setPreferredSize(new Dimension(280, 350));
	Coordinator c = root.getCoordinator();
	registerAction(c, TreeNode.COPY);
	registerAction(c, TreeNode.PASTE);
	registerAction(c, TreeNode.DELETE);
	
	//
	// Right pane
	//
	_propertiesFrame = new SimpleInternalFrame("Properties");

	setLeftComponent(_leftPane);
	setRightComponent(_propertiesFrame);

	setRoot(root);
    }   

    private void showCurrentNode()
    {
	_root.getCoordinator().showActions(_currentNode);

	if(_currentNode == null)
	{
	    Component oldContent = _propertiesFrame.getContent();
	    if(oldContent != null)
	    {
		_propertiesFrame.remove(oldContent);
	    }
	    _propertiesFrame.setTitle("Properties");
	    _propertiesFrame.setToolBar(null);
	    _currentEditor = null;
	}
	else
	{
	    _currentEditor = _currentNode.getEditor();
	    Component currentProperties = _currentEditor.getProperties();
	    _propertiesFrame.setContent(currentProperties);
	    _propertiesFrame.setTitle(currentProperties.getName());
	    _propertiesFrame.setToolBar(_currentEditor.getToolBar());
	}
	_propertiesFrame.validate();
	_propertiesFrame.repaint();
    }


    private void setEmptyDividerBorder()
    {
	SplitPaneUI splitPaneUI = getUI();
	if(splitPaneUI instanceof BasicSplitPaneUI) 
	{
	    BasicSplitPaneUI basicUI = (BasicSplitPaneUI)splitPaneUI;
	    basicUI.getDivider().setBorder(BorderFactory.createEmptyBorder());
	}
    }

    private class PopupListener extends MouseAdapter
    {
	public void mousePressed(MouseEvent e) 
	{
	    maybeShowPopup(e);
	}

	public void mouseReleased(MouseEvent e) 
	{
	    maybeShowPopup(e);
	}

	private void maybeShowPopup(MouseEvent e) 
	{
	    if (e.isPopupTrigger()) 
	    {
		JTree tree = (JTree)e.getComponent();

		TreePath path = tree.getPathForLocation(e.getX(), e.getY());
		
		if(path != null)
		{
		    TreeNode node = (TreeNode)path.getLastPathComponent();
		    JPopupMenu popup = node.getPopupMenu();
		    if(popup != null)
		    {
			popup.show(tree, e.getX(), e.getY());
		    }
		}
	    }
	}
    }

    
    private class SelectionListener implements TreeSelectionListener
    {
	public void valueChanged(TreeSelectionEvent e)
	{
	    if(_root.isSelectionListenerEnabled())
	    {
		//
		// Auto-apply changes
		//
		if(_currentEditor != null && !_currentEditor.save(false))
		{
		    //
		    // Go back to this path
		    //
		    _root.disableSelectionListener();
		    _root.setSelectedNode(_currentEditor.getTarget());
		    _root.enableSelectionListener();
		}
		else
		{
		    if(e.isAddedPath())
		    {
			TreePath path = e.getPath();
			
			if(path == null)
			{
			    showNode(null);
			}
			else
			{
			    TreeNode node = (TreeNode)path.getLastPathComponent();
			    Root root = node.getRoot();
			    if(root.hasNode(node))
			    {
				showNode(node);
			    }
			    else
			    {
				node = root.findNodeLike(path, false);
				if(node == null)
				{
				    node = root;
				}
				root.setSelectedNode(node);
			    }
			}
		    }
		    else
		    {
			showNode(null);
		    }
		}
	    }
	}
    }

    private Root _root;
    private SimpleInternalFrame _leftPane;
    private SimpleInternalFrame _propertiesFrame;

    //
    // back/forward navigation
    //
    private java.util.LinkedList _previousNodes = new java.util.LinkedList();
    private java.util.LinkedList _nextNodes = new java.util.LinkedList();

    private TreeNode _currentNode;
    private Editor _currentEditor;

    static private final int HISTORY_MAX_SIZE = 20;
}