/*
 *  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.trinidadinternal.taglib.listener;

import org.apache.myfaces.trinidadinternal.taglib.util.TagUtils;

import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspException;

import javax.faces.application.Application;
import javax.faces.component.ActionSource;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.webapp.UIComponentTag;

import org.apache.myfaces.trinidad.webapp.ELContextTag;
import org.apache.myfaces.trinidad.logging.TrinidadLogger;


/**
 * creates a ReturnActionListener on the parent ActionSource component.
 */
public class ReturnActionListenerTag extends TagSupport
{
  public void setValue(String value)
  {
    _value = value;
  }

  @Override
  public int doStartTag() throws JspException
  {
    UIComponentTag tag = UIComponentTag.getParentUIComponentTag(pageContext);
    if (tag == null)
    {
      throw new JspException(_LOG.getMessage(
        "RETURNACTIONLISTENER_MUST_INSIDE_UICOMPONENT_TAG"));
    }

    // Only run on the first time the tag executes
    if (!tag.getCreated())
      return SKIP_BODY;

    UIComponent component = tag.getComponentInstance();
    if (!(component instanceof ActionSource))
    {
      throw new JspException(_LOG.getMessage(
        "RETURNACTIONLISTENER_MUST_INSIDE_UICOMPONENT_TAG"));
    }

    ELContextTag parentELContext = (ELContextTag)
       findAncestorWithClass(this, ELContextTag.class);

    Application application =
      FacesContext.getCurrentInstance().getApplication();

    ReturnActionListener listener = new ReturnActionListener();
    if (_value != null)
    {
      String value = _value;
      if (TagUtils.isValueReference(value))
      {
        if (parentELContext != null)
          value = parentELContext.transformExpression(value);

        listener.setValueBinding(ReturnActionListener.VALUE_KEY,
                                 application.createValueBinding(value));
      }
      else
      {
        listener.setValue(value);
      }
    }
    ((ActionSource) component).addActionListener(listener);

    return super.doStartTag();
  }

  @Override
  public void release()
  {
    super.release();
    _value = null;
  }

  private String _value;
  private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(
    ReturnActionListenerTag.class);
}
