/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package org.apache.myfaces.tobago.facelets;
  
  import org.apache.myfaces.tobago.component.Attributes;
  
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.TagAttribute;
  import javax.faces.view.facelets.TagConfig;
  import javax.faces.view.facelets.TagHandler;
  import java.io.IOException;
  import java.util.Map;
  
  /**
   * @since 4.0.0
   */
  public class GridLayoutConstraintHandler extends TagHandler {
  
    private final TagAttribute columnSpan;
    private final TagAttribute rowSpan;
    private final TagAttribute gridColumn;
    private final TagAttribute gridRow;
  
    public GridLayoutConstraintHandler(final TagConfig config) {
      super(config);
  
      final TagAttribute oldColumn = getAttribute(Attributes.column.getName()); // deprecated
      final TagAttribute newColumn = getAttribute(Attributes.columnSpan.getName());
      columnSpan = newColumn != null ? newColumn : oldColumn;
  
      final TagAttribute oldRow = getAttribute(Attributes.row.getName()); // deprecated
      final TagAttribute newRow = getAttribute(Attributes.rowSpan.getName());
      rowSpan = newRow != null ? newRow : oldRow;
  
      gridColumn = getAttribute(Attributes.gridColumn.getName());
  
      gridRow = getAttribute(Attributes.gridRow.getName());
    }
  
    @Override
    public void apply(final FaceletContext faceletContext, final UIComponent parent) throws IOException {
      final Map<String, Object> attributes = parent.getAttributes();
  
      if (columnSpan != null) {
        if (columnSpan.isLiteral()) {
          attributes.put(Attributes.columnSpan.getName(), Integer.valueOf(columnSpan.getValue()));
        } else {
          parent.setValueExpression(Attributes.columnSpan.getName(),
              columnSpan.getValueExpression(faceletContext, Integer.TYPE));
        }
      }
  
      if (rowSpan != null) {
        if (rowSpan.isLiteral()) {
          attributes.put(Attributes.rowSpan.getName(), Integer.valueOf(rowSpan.getValue()));
        } else {
          parent.setValueExpression(Attributes.rowSpan.getName(),
              rowSpan.getValueExpression(faceletContext, Integer.TYPE));
        }
      }
  
      if (gridColumn != null) {
        if (gridColumn.isLiteral()) {
          attributes.put(Attributes.gridColumn.getName(), Integer.valueOf(gridColumn.getValue()));
        } else {
          parent.setValueExpression(Attributes.gridColumn.getName(),
              gridColumn.getValueExpression(faceletContext, Integer.TYPE));
        }
      }
  
      if (gridRow != null) {
        if (gridRow.isLiteral()) {
          attributes.put(Attributes.gridRow.getName(), Integer.valueOf(gridRow.getValue()));
        } else {
          parent.setValueExpression(Attributes.gridRow.getName(),
              gridRow.getValueExpression(faceletContext, Integer.TYPE));
        }
      }
    }
  }