/* ======================================================================
The Bodington System Software License, Version 1.0
  
Copyright (c) 2001 The University of Leeds.  All rights reserved.
  
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

1.  Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

2.  Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

3.  The end-user documentation included with the redistribution, if any,
must include the following acknowledgement:  "This product includes
software developed by the University of Leeds
(http://www.bodington.org/)."  Alternately, this acknowledgement may
appear in the software itself, if and wherever such third-party
acknowledgements normally appear.

4.  The names "Bodington", "Nathan Bodington", "Bodington System",
"Bodington Open Source Project", and "The University of Leeds" must not be
used to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
d.gardner@leeds.ac.uk.

5.  The name "Bodington" may not appear in the name of products derived
from this software without prior written permission of the University of
Leeds.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO,  TITLE,  THE IMPLIED WARRANTIES 
OF QUALITY  AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO 
EVENT SHALL THE UNIVERSITY OF LEEDS OR ITS CONTRIBUTORS BE LIABLE FOR 
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGE.
=========================================================

This software was originally created by the University of Leeds and may contain voluntary 
contributions from others.  For more information on the Bodington Open Source Project, please 
see http://bodington.org/

====================================================================== */

package org.bodington.applet.components;

import org.bodington.applet.data.*;

import javax.swing.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.beans.*;
import java.awt.*;
import java.io.*;
import java.util.*;

public class LocalFileList extends javax.swing.JList
    implements java.awt.dnd.DragGestureListener, 
                java.awt.dnd.DragSourceListener,
                java.awt.dnd.DropTargetListener
	{
	File path;
	DragSource dragSource = null;
    DropTarget dropTarget = null;

	FileDownloader downloader;

	public LocalFileList()
		{
		setCellRenderer( new FileListCellRenderer() );
		//dropTarget = new DropTarget( this, this );
		//dragSource = new DragSource();
		//dragSource.createDefaultDragGestureRecognizer( this, DnDConstants.ACTION_COPY_OR_MOVE, this);
		}

	public LocalFileList( File path )
		{
		this();
		setDirectory( path );
		}
		
	public void setFileDownloader( FileDownloader downloader )
		{
		this.downloader = downloader;
		}
		
    protected void processFocusEvent( FocusEvent e )
        {
        super.processFocusEvent( e );
        // background of selected items changes
        // when focus is lost so we need to get
        // the list items to redraw
        repaint();
        }
		
	public void setDirectory( File path )
		{
		this.path = path;

		DefaultListModel model = new DefaultListModel();

		if ( path != null )
			{
			File[] files = path.listFiles();
			if ( files!=null )
			    {
                Arrays.sort( files, LocalFileComparator.getInstance() );
			    for ( int i=0; i<files.length; i++ )
				    {
				    //if ( files[i].isFile() )
					model.addElement( new FileListNode( files[i] ) );
				    }
				}
			}

		setModel( model );
		}

    public File[] getSelectedFiles()
        {
        Object[] olist = this.getSelectedValues();
        if ( olist == null )
            return null;
        File[] flist = new File[olist.length];
        for ( int i=0; i<olist.length; i++ )
            flist[i] = ((FileListNode)olist[i]).file;
        return flist;
        }


    public void dragEnter( DropTargetDragEvent dtde )
   	    {
        System.out.println( "public void dragEnter(DropTargetDragEvent dtde)" );
        if ( dtde.getSource() == this )
        	dtde.rejectDrag();
        else
        	dtde.acceptDrag( DnDConstants.ACTION_COPY );
   	    }

    public void dragExit( DropTargetEvent dte )
   	    {
   	    }

    public void drop( DropTargetDropEvent dtde )
        {
	    System.out.println( "Drop requested" );

	    try
		    {
		    Transferable transferable = dtde.getTransferable();

		    if ( !transferable.isDataFlavorSupported( RemoteFileSelection.remoteFileSelectionFlavor ) )
		        {
    			JOptionPane.showMessageDialog(null, "You can only drag files from the remote file system here.", "Alert", JOptionPane.ERROR_MESSAGE); 
    		    dtde.rejectDrop();
		        return;
		        }

		    RemoteFileSelection rflist =(RemoteFileSelection)transferable.getTransferData( 
						RemoteFileSelection.remoteFileSelectionFlavor );
    			
            if ( downloader == null )
                {
    			JOptionPane.showMessageDialog(null, "Can't find file downloader.", "Alert", JOptionPane.ERROR_MESSAGE); 
    		    dtde.rejectDrop();
		        return;
                }
                
			dtde.acceptDrop( DnDConstants.ACTION_COPY );
            downloader.transferFiles( path, rflist.getFileList(), true );
		    }
	    catch (IOException exception)
		    {
		    exception.printStackTrace();
		    System.err.println( "Exception" + exception.getMessage());
		    dtde.rejectDrop();
		    } 
	    catch (UnsupportedFlavorException ufException )
		    {
		    ufException.printStackTrace();
		    System.err.println( "Exception" + ufException.getMessage());
		    dtde.rejectDrop();
		    }   
        }

    public void dragOver( DropTargetDragEvent dtde )
        {
        dtde.acceptDrag(DnDConstants.ACTION_COPY);
        }

    public void dropActionChanged( DropTargetDragEvent dtde )
        {
        // This method is derived from interface java.awt.dnd.DropTargetListener
        // to do: code goes here
        }


    public void dragDropEnd( DragSourceDropEvent dsde )
    	{
    	System.out.println( "LocalFileList.dragDropEnd" );
   	    }

    public void dragEnter( DragSourceDragEvent dsde )
   	    {
        // This method is derived from interface java.awt.dnd.DragSourceListener
        // to do: code goes here
   	    }

    public void dragExit( DragSourceEvent dse )
   	    {
        // This method is derived from interface java.awt.dnd.DragSourceListener
        // to do: code goes here
   	    }

    public void dragGestureRecognized( DragGestureEvent event )
    	{
    	// what selection are made at this time?
    	int[] ilist = getSelectedIndices();
    	System.out.println( "LocalFileList has " + ilist.length + " selections at start of drag." );
    	for ( int i=0; i<ilist.length; i++ )
            System.out.println( "Selection index: " + ilist[i] );    	    
            
	    Point p = event.getDragOrigin();
	    int i = locationToIndex( p );
	    
	    // if not on a list item forget it
	    if ( i<0 )
	    	return;

		FileListNode sourcenode = (FileListNode)getModel().getElementAt( i );
	 
    	if ( sourcenode != null )
	   		{
    		if ( sourcenode.file != null  )
        		{
        		if ( sourcenode.file.exists() )
         			{
            	    LocalFileSelection selection = new LocalFileSelection( sourcenode.file );
         			System.out.println( "Starting drag on: " + sourcenode.file.getAbsolutePath() );
         			dragSource.startDrag(event, DragSource.DefaultMoveDrop, selection, this);
         			}
        		}
   			}
		else
	   		{
    		System.out.println( "nothing was selected");   
   			}
    	}

    public void dragOver( DragSourceDragEvent dsde )
        {
        // This method is derived from interface java.awt.dnd.DragSourceListener
        // to do: code goes here
        }

    public void dropActionChanged( DragSourceDragEvent dsde )
        {
        // This method is derived from interface java.awt.dnd.DragSourceListener
        // to do: code goes here
        } 


    public static class LocalFileComparator
        implements Comparator
        {
        private static LocalFileComparator instance = 
            new LocalFileComparator();
            
        public static LocalFileComparator getInstance()
            {
            return instance;
            }

        public int compare( Object o1, Object o2 )
            {
            if ( !(o1 instanceof File) )
                return 0;
            if ( !(o2 instanceof File) )
                return 0;

            File f1 = (File)o1;
            File f2 = (File)o2;
            
            if ( f1.isDirectory() && f2.isFile() )
                return -1;

            if ( f2.isDirectory() && f1.isFile() )
                return 1;
            
            String s1 = f1.getName();
            String s2 = f2.getName();
            
            
            return String.CASE_INSENSITIVE_ORDER.compare( s1, s2 );
            }
        
        public boolean equals( Object obj )
            {
            return obj instanceof LocalFileComparator;
            }
        
        }




	// Inner class that represents a node in this file system tree
	protected static class FileListNode
	    implements Iconic
		{
        protected static Icon closedIcon = null;
        protected static Icon leafIcon = null;
    
		File file;
		protected FileListNode( File f )
			{
			file = f;
            if ( closedIcon == null )
                closedIcon = UIManager.getIcon("Tree.closedIcon");
            if ( leafIcon == null )
                leafIcon = UIManager.getIcon("Tree.leafIcon");
			}

		public String toString()
			{
			return file.getName();
			}
		
		public Icon getIcon()
		    {
		    if ( file.isFile() )
		        return leafIcon;
		    return closedIcon;
		    }
		}
	}