/*
* 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) 2006 - 2013 Pentaho Corporation and Contributors.  All rights reserved.
*/

package org.pentaho.reporting.libraries.css.resolver.values.computed.box;

import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
import org.pentaho.reporting.libraries.css.keys.box.BoxStyleKeys;
import org.pentaho.reporting.libraries.css.keys.box.DisplayModel;
import org.pentaho.reporting.libraries.css.keys.box.DisplayRole;
import org.pentaho.reporting.libraries.css.keys.box.Floating;
import org.pentaho.reporting.libraries.css.keys.positioning.PositioningStyleKeys;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.resolver.values.computed.ConstantsResolveHandler;
import org.pentaho.reporting.libraries.css.values.CSSValue;

public class FloatResolveHandler extends ConstantsResolveHandler {
  public FloatResolveHandler() {
    addNormalizeValue( Floating.BOTTOM );
    addNormalizeValue( Floating.LEFT );
    addNormalizeValue( Floating.END );
    addNormalizeValue( Floating.INSIDE );
    addNormalizeValue( Floating.IN_COLUMN );
    addNormalizeValue( Floating.MID_COLUMN );
    addNormalizeValue( Floating.NONE );
    addNormalizeValue( Floating.OUTSIDE );
    addNormalizeValue( Floating.RIGHT );
    addNormalizeValue( Floating.START );
    addNormalizeValue( Floating.TOP );
    setFallback( Floating.NONE );
  }

  /**
   * This indirectly defines the resolve order. The higher the order, the more dependent is the resolver on other
   * resolvers to be complete.
   *
   * @return the array of required style keys.
   */
  public StyleKey[] getRequiredStyles() {
    return new StyleKey[] {
      BoxStyleKeys.DISPLAY_ROLE,
      PositioningStyleKeys.POSITION
    };
  }

  /**
   * Resolves a single property.
   *
   * @param currentNode
   * @param style
   */
  public void resolve( final DocumentContext process,
                       final LayoutElement currentNode,
                       final StyleKey key ) {
    final LayoutStyle layoutContext = currentNode.getLayoutStyle();
    final CSSValue displayRole = layoutContext.getValue( BoxStyleKeys.DISPLAY_ROLE );
    final CSSValue floating;
    if ( DisplayRole.NONE.equals( displayRole ) ) {
      floating = Floating.NONE;
    } else {
      floating = resolveValue( process, currentNode, key );
    }

    if ( Floating.NONE.equals( floating ) == false ) {
      //  Otherwise, if 'float' has a value other than 'none', 'display'
      // is set to 'block' and the box is floated.
      layoutContext.setValue( BoxStyleKeys.DISPLAY_MODEL, DisplayModel.BLOCK_INSIDE );
      layoutContext.setValue( BoxStyleKeys.DISPLAY_ROLE, DisplayRole.BLOCK );
    }

    layoutContext.setValue( key, Floating.NONE );
  }
}