/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.reporting.designer.core.editor.palette;

import org.pentaho.reporting.designer.core.ReportDesignerContext;
import org.pentaho.reporting.designer.core.actions.elements.InsertElementAction;
import org.pentaho.reporting.designer.core.util.dnd.ElementMetaDataTransferable;
import org.pentaho.reporting.engine.classic.core.event.ReportModelEvent;
import org.pentaho.reporting.engine.classic.core.metadata.ElementMetaData;
import org.pentaho.reporting.engine.classic.core.metadata.ElementTypeRegistry;

import javax.swing.*;
import java.awt.*;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSource;
import java.awt.image.BufferedImage;
import java.beans.BeanInfo;
import java.util.Locale;

/**
 * A component holding the report. It contains the lineals, zoom controller in the upper left corner and as a viewport,
 * it contains the report-layout component.
 *
 * @author Ezequiel Cuellar
 */
public class PaletteButton extends JButton implements DragGestureListener {
  private static class AlwaysActiveInsertElementAction extends InsertElementAction {
    private AlwaysActiveInsertElementAction( final ElementMetaData metaData ) {
      super( metaData );
    }

    protected void selectedElementPropertiesChanged( final ReportModelEvent event ) {
    }

    protected void updateSelection() {
      setEnabled( getActiveContext() != null );
    }
  }

  private String elementName;
  private static final BufferedImage EMPTY_DRAG_IMAGE = new BufferedImage( 1, 1, BufferedImage.TYPE_INT_ARGB );

  public PaletteButton( final ElementMetaData elementMetaData,
                        final ReportDesignerContext context ) {
    if ( elementMetaData == null ) {
      throw new NullPointerException();
    }
    elementName = elementMetaData.getName();
    putClientProperty( "hideActionText", Boolean.TRUE ); // NON-NLS

    final DragSource dragSource = new DragSource();

    dragSource.createDefaultDragGestureRecognizer( this, DnDConstants.ACTION_COPY, this );

    final InsertElementAction action = new AlwaysActiveInsertElementAction( elementMetaData );
    action.setReportDesignerContext( context );
    setAction( action );

    final Image icon = elementMetaData.getIcon( Locale.getDefault(), BeanInfo.ICON_COLOR_16x16 );
    if ( icon != null ) {
      setIcon( new ImageIcon( icon ) );
    } else {
      setText( elementMetaData.getDisplayName( Locale.getDefault() ) );
    }
    setToolTipText( elementMetaData.getDescription( Locale.getDefault() ) );
    setFocusable( false );
    setBorder( BorderFactory.createEmptyBorder( 4, 4, 4, 4 ) );
  }

  public void dragGestureRecognized( final DragGestureEvent anEvent ) {
    final ElementMetaData elementMetaData = ElementTypeRegistry.getInstance().getElementType( elementName );
    final ElementMetaDataTransferable transferable = new ElementMetaDataTransferable( elementMetaData );
    anEvent.startDrag( DragSource.DefaultCopyNoDrop, EMPTY_DRAG_IMAGE, new Point(), transferable, null );

    final ButtonModel model = getModel();
    model.setArmed( false );
    model.setPressed( false );
  }
}