/*
    * 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.extension;
  
  import org.apache.myfaces.tobago.component.Attributes;
  import org.apache.myfaces.tobago.component.Facets;
  import org.apache.myfaces.tobago.component.UILabel;
  import org.apache.myfaces.tobago.component.UISeparator;
  import org.apache.myfaces.tobago.util.ComponentUtils;
  
  import javax.el.ELException;
  import javax.el.ValueExpression;
  import javax.faces.FacesException;
  import javax.faces.application.Application;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIOutput;
  import javax.faces.component.UIViewRoot;
  import javax.faces.view.facelets.ComponentConfig;
  import javax.faces.view.facelets.ComponentHandler;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.MetaRuleset;
  import javax.faces.view.facelets.TagAttribute;
  import java.io.IOException;
  
  public class SeparatorExtensionHandler extends ComponentHandler {
    private TagAttribute labelAttribute;
  
    public SeparatorExtensionHandler(ComponentConfig config) {
      super(config);
      labelAttribute = getAttribute(Attributes.LABEL);
    }
  
    public void applyNextHandler(FaceletContext faceletContext, UIComponent separator)
        throws IOException, FacesException, ELException {
      if (ComponentHandler.isNew(separator)) {
        UIComponent component = (UIComponent) separator.getFacets().remove(Facets.LABEL);
        nextHandler.apply(faceletContext, component);
        separator.getFacets().put(Facets.LABEL, component);
      } else {
        nextHandler.apply(faceletContext, separator.getFacet(Facets.LABEL));
      }
    }
  
    public void onComponentCreated(FaceletContext faceletContext, UIComponent separator, UIComponent parent) {
      Application application = faceletContext.getFacesContext().getApplication();
      UIViewRoot root = ComponentUtils.findViewRoot(faceletContext, parent);
      UIOutput label = (UIOutput) application.createComponent(UILabel.COMPONENT_TYPE);
      label.setId(root.createUniqueId());
      label.setRendererType("Label");
      setAttributes(faceletContext, label);
      separator.getFacets().put(Facets.LABEL, label);
      if (labelAttribute != null) {
        if (labelAttribute.isLiteral()) {
          label.setValue(labelAttribute.getValue(faceletContext));
        } else {
          ValueExpression expression = labelAttribute.getValueExpression(faceletContext, String.class);
          label.setValueExpression(Attributes.VALUE, expression);
        }
      }
    }
  
    protected MetaRuleset createMetaRuleset(Class aClass) {
      MetaRuleset metaRuleset = super.createMetaRuleset(aClass);
      if (UISeparator.class.isAssignableFrom(aClass)) {
        metaRuleset.ignore(Attributes.LABEL);
        return metaRuleset;
      } else {
        TagAttribute[] attrs = tag.getAttributes().getAll();
        for (int i = 0; i < attrs.length; i++) {
          TagAttribute attr = attrs[i];
          metaRuleset.ignore(attr.getLocalName());
        }
        return metaRuleset;
      }
    }
  }