/* Copyright (C) 2012 JabRef contributors.

  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 3 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, see <http://www.gnu.org/licenses/>.
 */

package net.sf.jabref.gui;

import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.io.IOException;
import java.io.StringWriter;

import javax.swing.JComponent;
import javax.swing.JEditorPane;
import javax.swing.TransferHandler;
import javax.swing.text.BadLocationException;

import net.sf.jabref.EntryContainer;
import net.sf.jabref.Globals;
import net.sf.jabref.JabRefFrame;

public class PreviewPanelTransferHandler extends FileListEditorTransferHandler {
    
    public PreviewPanelTransferHandler(JabRefFrame frame, EntryContainer entryContainer, TransferHandler textTransferHandler) {
        super(frame, entryContainer, textTransferHandler);
    }

    /**
     * LINK is unsupported as dropping into into Microsoft Word then leads to a link instead to a copy
     */
    @Override
    public int getSourceActions(JComponent c) {
        return DnDConstants.ACTION_COPY;
    }

    @Override
    protected Transferable createTransferable(JComponent c) {
        if (c instanceof JEditorPane) {
            // this method should be called from the preview panel only
            
            // the default TransferHandler implementation is aware of HTML
            // and returns an appropriate Transferable
            // as textTransferHandler.createTransferable() is not available and
            // I don't know any other method, I do the HTML conversion by hand

            // First, get the HTML of the selected text
            JEditorPane e = (JEditorPane) c;
            StringWriter sw = new StringWriter();
            try {
                e.getEditorKit().write(sw, e.getDocument(), e.getSelectionStart(), e.getSelectionEnd());
            } catch (IOException e1) {
                e1.printStackTrace();
            } catch (BadLocationException e1) {
                e1.printStackTrace();
            }
            
            // Second, return the HTML (and text as fallback)
            return new HtmlTransferable(sw.toString(), e.getSelectedText());
        } else {
            // if not called from the preview panel, return an error string
            return new StringSelection(Globals.lang("Operation not supported"));
        }
    }
}