/*!
* 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.css.resolver.values.autovalue.fonts;

import org.pentaho.reporting.libraries.css.StyleSheetUtility;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.LayoutOutputMetaData;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
import org.pentaho.reporting.libraries.css.dom.OutputProcessorFeature;
import org.pentaho.reporting.libraries.css.keys.font.FontSmooth;
import org.pentaho.reporting.libraries.css.keys.font.FontStyleKeys;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.resolver.values.ResolveHandler;
import org.pentaho.reporting.libraries.css.values.CSSValue;

/**
 * Creation-Date: 18.12.2005, 15:13:24
 *
 * @author Thomas Morgner
 */
public class FontSmoothResolveHandler implements ResolveHandler {
  public FontSmoothResolveHandler() {
  }

  /**
   * This indirectly defines the resolve order. The higher the order, the more dependent is the resolver on other
   * resolvers to be complete.
   *
   * @return
   */
  public StyleKey[] getRequiredStyles() {
    return new StyleKey[] {
      FontStyleKeys.FONT_SIZE
    };
  }

  /**
   * Resolves a single property.
   */
  public void resolve( final DocumentContext process,
                       final LayoutElement currentNode,
                       final StyleKey key ) {
    // as this is an 'auto' handler, we can assume that 'auto' is the
    // current value
    final LayoutStyle layoutContext = currentNode.getLayoutStyle();
    final CSSValue value = layoutContext.getValue( FontStyleKeys.FONT_SIZE );

    final LayoutOutputMetaData metaData = process.getOutputMetaData();
    final int resolution = (int) metaData.getNumericFeatureValue( OutputProcessorFeature.DEVICE_RESOLUTION );
    final double fontSize = StyleSheetUtility.convertLengthToDouble( value, resolution );
    final double threshold = metaData.getNumericFeatureValue( OutputProcessorFeature.FONT_SMOOTH_THRESHOLD );
    if ( fontSize < threshold ) {
      layoutContext.setValue( FontStyleKeys.FONT_SMOOTH, FontSmooth.NEVER );
    } else {
      layoutContext.setValue( FontStyleKeys.FONT_SMOOTH, FontSmooth.ALWAYS );
    }
  }
}