/*
 * Copyright 2006 The Apache Software Foundation.
 *
 * Licensed 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.custom.conversation;

import java.util.Iterator;

import javax.faces.component.UICommand;
import javax.faces.component.UIComponent;
import javax.faces.el.ValueBinding;
import javax.faces.el.MethodBinding;
import javax.faces.context.FacesContext;

// Added
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;

public class ConversationUtils
{
	private ConversationUtils()
	{
	}

	/**
	 * Find the first parent which is a command
	 */
	public static UICommand findParentCommand(UIComponent base)
	{
		UIComponent parent = base;
		do
		{
			parent = parent.getParent();
			if (parent instanceof UICommand)
			{
				return (UICommand) parent;
			}
		}
		while (parent != null);

		return null;
	}

	/**
	 * Find a child start or end conversation component for the given conversation name
	 */
	public static AbstractConversationComponent findStartOrEndConversationComponent(UIComponent component, String conversationName)
	{
		Iterator iterComponents = component.getFacetsAndChildren();
		while (iterComponents.hasNext())
		{
			Object child = iterComponents.next();
			AbstractConversationComponent conversation;

			if (child instanceof UIStartConversation || child instanceof UIEndConversation)
			{
				conversation = (AbstractConversationComponent) child;
				if (conversation.getName().equals(conversationName))
				{
					return conversation;
				}
			}
			else if (child instanceof UIComponent)
			{
				conversation = findStartOrEndConversationComponent((UIComponent) child, conversationName);
				if (conversation != null)
				{
					return conversation;
				}
			}
		}

		return null;
	}


        public static String getManagedBeanName(FacesContext context, Object myBean) throws ClassNotFoundException {
            String managedBeanName = null;
            HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest();
            
            // lookup bean in request scope
            Enumeration requestAttributeNames = request.getAttributeNames();
            while (requestAttributeNames.hasMoreElements()) {
                String requestAttribute = (String) requestAttributeNames.nextElement();
                Object object = request.getAttribute(requestAttribute);
                if ( Class.forName(myBean.getClass().getName()).isInstance(object) ) {
                    managedBeanName = requestAttribute;
                    break;
                }
            }

            return managedBeanName;
        }        

	/**
	 * end and restart a conversation
	 */
	static void endAndRestartConversation(FacesContext context, String conversationName, Boolean restart, MethodBinding restartAction)
	{
		ConversationManager conversationManager = ConversationManager.getInstance(context);
		Conversation conversation = conversationManager.getConversation(conversationName);

		conversationManager.endConversation(conversationName, true);

		if (restart != null && restart.booleanValue() && conversation != null)
		{
			conversationManager.startConversation(conversationName, conversation.isPersistence());

			if (restartAction != null)
			{
				restartAction.invoke(context, null);
			}
		}
	}
}