//
// $Id: DnDListener.java 997 2010-02-18 10:30:30Z etienne_sf $
//
// jupload - A file upload applet.
// Copyright 2007 The JUpload Team
//
// Created: ?
// Creator: William JinHua Kwong
// Last modified: $Date: 2010-02-18 08:30:30 -0200 (Qui, 18 Fev 2010) $
//
// 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.,
// 675 Mass Ave, Cambridge, MA 02139, USA.

package wjhk.jupload2.gui;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

import wjhk.jupload2.filedata.DefaultFileData;
import wjhk.jupload2.policies.UploadPolicy;

/**
 * Our implementation of DND.
 * 
 * @author William JinHua Kwong
 * @version $Release$
 */
public class DnDListener implements DropTargetListener {

    private JUploadPanel uploadPanel;

    private UploadPolicy uploadPolicy;

    /**
     * Creates a new instance.
     * 
     * @param uploadPanel The corresponding upload panel.
     * @param uploadPolicy
     */
    public DnDListener(JUploadPanel uploadPanel, UploadPolicy uploadPolicy) {
        this.uploadPanel = uploadPanel;
        this.uploadPolicy = uploadPolicy;
    }

    // DataFlavor javaFileListFlavor = createConstant("application/x-java-file-list;class=java.util.List", null);

    DataFlavor uriListFlavor = new DataFlavor("text/uri-list;class=java.lang.String", null);


    /**
     * @see java.awt.dnd.DropTargetListener#dragEnter(java.awt.dnd.DropTargetDragEvent)
     */
    public void dragEnter(DropTargetDragEvent e) {
      //System.out.println(e);
      //System.out.println(e.getCurrentDataFlavorsAsList());

        if (!e.isDataFlavorSupported(DataFlavor.javaFileListFlavor) && !e.isDataFlavorSupported(uriListFlavor)) {
            e.rejectDrag();
        }
    }

    /**
     * @see java.awt.dnd.DropTargetListener#dragOver(java.awt.dnd.DropTargetDragEvent)
     */
    public void dragOver(DropTargetDragEvent e) {
        // Nothing to do.
    }

    /**
     * @see java.awt.dnd.DropTargetListener#dropActionChanged(java.awt.dnd.DropTargetDragEvent)
     */
    public void dropActionChanged(DropTargetDragEvent e) {
        // Nothing to do.
    }

    /**
     * @see java.awt.dnd.DropTargetListener#drop(java.awt.dnd.DropTargetDropEvent)
     */
    @SuppressWarnings("unchecked")
    public void drop(DropTargetDropEvent e) {
        if (!e.isDataFlavorSupported(DataFlavor.javaFileListFlavor) && !e.isDataFlavorSupported(uriListFlavor)) {
            e.rejectDrop();
        } else {
            e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
            try {
                File[] fileArray;

                if (e.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                  List<File> fileList = (List<File>) e.getTransferable()
                          .getTransferData(DataFlavor.javaFileListFlavor);

                  fileArray = (File[]) (fileList.toArray());
                } else {
                  // uriListFlavor; attempt to convert URIs to files
                  String strList = (String) e.getTransferable()
                          .getTransferData(uriListFlavor);
                  //System.out.println(strList);
                  List<File> fileList = new ArrayList<File>();
                  for (String s : strList.split("\n")) try {
                    fileList.add(new File(new URI(s.trim())));
                  } catch (URISyntaxException ex) {
                    ex.printStackTrace();
                    e.rejectDrop();
                    return;
                  }
                  fileArray = (File[]) (fileList.toArray(new File[fileList.size()]));
                  //System.out.println("fileArray="+Arrays.toString(fileArray));
                }
                this.uploadPanel.getFilePanel().addFiles(fileArray,
                        DefaultFileData.getRoot(fileArray));

                e.getDropTargetContext().dropComplete(true);

                // Let's communicate this to the upload policy: there may be
                // something to do now.
                this.uploadPolicy.afterFileDropped(e);

            } catch (IOException ioe) {
                this.uploadPolicy.displayErr("DnDListener.drop()", ioe);
                e.rejectDrop();
            } catch (UnsupportedFlavorException ufe) {
                this.uploadPolicy.displayErr("DnDListener.drop()", ufe);
                e.rejectDrop();
            }

        }
    }

    /**
     * @see java.awt.dnd.DropTargetListener#dragExit(java.awt.dnd.DropTargetEvent)
     */
    public void dragExit(DropTargetEvent e) {
        // Nothing to do.
    }
}