/*
    * 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.internal.taglib.component;
  
  import org.apache.myfaces.tobago.apt.annotation.BodyContent;
  import org.apache.myfaces.tobago.apt.annotation.Tag;
  import org.apache.myfaces.tobago.apt.annotation.TagAttribute;
  import org.apache.myfaces.tobago.apt.annotation.TagGeneration;
  import org.apache.myfaces.tobago.component.Attributes;
  import org.apache.myfaces.tobago.event.PopupActionListener;
  
  import javax.el.ValueExpression;
  import javax.faces.component.ActionSource;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.webapp.UIComponentClassicTagBase;
  import javax.faces.webapp.UIComponentELTag;
  import javax.servlet.jsp.JspException;
  import javax.servlet.jsp.tagext.TagSupport;
  
  /**
   * Register an PopupActionListener instance on the UIComponent
   * associated with the closest parent UIComponent.
   */
  @Tag(name = "popupReference", bodyContent = BodyContent.EMPTY)
  @TagGeneration(className = "org.apache.myfaces.tobago.internal.taglib.PopupReferenceTag")
  public abstract class PopupReferenceTag extends TagSupport {
  
    private static final long serialVersionUID = 2L;
  
    private javax.el.ValueExpression forValue;
  
    public int doStartTag() throws JspException {
  
      // Locate our parent UIComponentTag
      UIComponentClassicTagBase tag =
          UIComponentELTag.getParentUIComponentClassicTagBase(pageContext);
      if (tag == null) {
        // TODO Message resource i18n
        throw new JspException("Not nested in faces tag");
      }
  
      if (!tag.getCreated()) {
        return (SKIP_BODY);
      }
  
      UIComponent component = tag.getComponentInstance();
      if (component == null) {
        // TODO Message resource i18n
        throw new JspException("Component Instance is null");
      }
      if (!(component instanceof ActionSource)) {
        // TODO Message resource i18n
        throw new JspException("Component " + component.getClass().getName() + " is not instanceof ActionSource");
      }
      ActionSource actionSource = (ActionSource) component;
  
      component.setValueExpression(Attributes.FOR, forValue);
  
      if (forValue.isLiteralText()) {
        actionSource.addActionListener(new PopupActionListener(
            (String) forValue.getValue(FacesContext.getCurrentInstance().getELContext())));
      } else {
        component.setValueExpression(Attributes.FOR, forValue);
      }
      return (SKIP_BODY);
    }
  
    /**
     * The id of a Popup.
     */
    @TagAttribute(required = true, name = "for", type = "java.lang.String")
    public void setFor(ValueExpression forValue) {
      this.forValue = forValue;
    }
  
  }