/*!
* 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.libraries.designtime.swing.bulk;

import org.pentaho.reporting.libraries.base.util.BulkDataUtility;
import org.pentaho.reporting.libraries.designtime.swing.Messages;

import javax.swing.*;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.TableCellEditor;
import java.awt.event.ActionEvent;

public class SortBulkDownAction extends AbstractAction implements ListSelectionListener, ListDataListener {
  private BulkDataProvider tableModel;
  private ListSelectionModel listSelectionModel;
  private JTable editorTable;

  /**
   * Defines an <code>Action</code> object with a default description string and default icon.
   */
  public SortBulkDownAction( final BulkDataProvider tableModel,
                             final ListSelectionModel listSelectionModel ) {
    this.tableModel = tableModel;
    this.listSelectionModel = listSelectionModel;
    this.listSelectionModel.addListSelectionListener( this );

    putValue( Action.SMALL_ICON, Messages.getInstance().getIcon( "Icons.MOVE_DOWN" ) );
    putValue( Action.SHORT_DESCRIPTION, Messages.getInstance().getString( "Action.MOVE_DOWN" ) );
  }

  public SortBulkDownAction( final BulkDataProvider tableModel,
                             final ListSelectionModel listSelectionModel,
                             final JTable table ) {

    this( tableModel, listSelectionModel );
    this.editorTable = table;
  }


  public void valueChanged( final ListSelectionEvent e ) {
    updateEnabled();
  }

  private void updateEnabled() {
    if ( listSelectionModel.isSelectionEmpty() ) {
      setEnabled( false );
    } else if ( listSelectionModel.getMaxSelectionIndex() == ( tableModel.getBulkDataSize() - 1 ) ) {
      // already the last entry ...
      setEnabled( false );
    } else {
      setEnabled( true );
    }
  }

  public void intervalAdded( final ListDataEvent e ) {
    updateEnabled();
  }

  public void intervalRemoved( final ListDataEvent e ) {
    updateEnabled();
  }

  public void contentsChanged( final ListDataEvent e ) {
    updateEnabled();
  }

  /**
   * Invoked when an action occurs.
   */
  public void actionPerformed( final ActionEvent e ) {
    if ( listSelectionModel.isSelectionEmpty() ) {
      return;
    }
    final Object[] data = tableModel.getBulkData();
    if ( listSelectionModel.getMaxSelectionIndex() == ( data.length - 1 ) ) {
      // already the first entry ...
      return;
    }

    if ( editorTable != null ) {
      final TableCellEditor cellEditor = editorTable.getCellEditor();
      if ( cellEditor != null ) {
        cellEditor.stopCellEditing();
      }
    }

    final Object[] result = (Object[]) data.clone();
    final boolean[] selections = new boolean[ result.length ];
    for ( int i = listSelectionModel.getMinSelectionIndex(); i <= listSelectionModel.getMaxSelectionIndex(); i++ ) {
      selections[ i ] = listSelectionModel.isSelectedIndex( i );
    }

    BulkDataUtility.pushDown( result, selections );

    tableModel.setBulkData( result );

    listSelectionModel.setValueIsAdjusting( true );
    listSelectionModel.removeSelectionInterval( 0, selections.length );
    for ( int i = 0; i < selections.length; i++ ) {
      final boolean selection = selections[ i ];
      if ( selection ) {
        listSelectionModel.addSelectionInterval( i, i );
      }
    }
    listSelectionModel.setValueIsAdjusting( false );
  }
}