/*!
* 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.report;

import org.pentaho.reporting.designer.core.ReportDesignerBoot;
import org.pentaho.reporting.designer.core.editor.ReportDocumentContext;
import org.pentaho.reporting.designer.core.model.ModelUtility;
import org.pentaho.reporting.engine.classic.core.Element;
import org.pentaho.reporting.engine.classic.core.Section;

import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.ImageObserver;

public class SelectionOverlayRenderer implements OverlayRenderer {
  private Section rootElement;
  private ReportDocumentContext context;
  private double zoomFactor;
  private double offset;

  public SelectionOverlayRenderer( final Element defaultElement ) {
    if ( defaultElement instanceof Section ) {
      this.rootElement = (Section) defaultElement;
    }
  }

  public void validate( final ReportDocumentContext context, final double zoomFactor, final Point2D sectionOffset ) {
    this.offset = sectionOffset.getY();
    this.context = context;
    this.zoomFactor = zoomFactor;
  }

  public void draw( final Graphics2D graphics, final Rectangle2D bounds, final ImageObserver obs ) {
    if ( context == null || rootElement == null ) {
      return;
    }

    graphics.translate( bounds.getX(), -( offset * zoomFactor ) );

    for ( final Element visualElement : context.getSelectionModel().getSelectedElementsOfType( Element.class ) ) {
      if ( ModelUtility.isDescendant( rootElement, visualElement ) == false ) {
        continue;
      }
      final Object o = visualElement
        .getAttribute( ReportDesignerBoot.DESIGNER_NAMESPACE, ReportDesignerBoot.SELECTION_OVERLAY_INFORMATION );
      if ( o instanceof SelectionOverlayInformation == false ) {
        continue;
      }

      final SelectionOverlayInformation information = (SelectionOverlayInformation) o;
      information.validate( zoomFactor );
      information.draw( graphics, obs );
    }
  }
}