/*
 * 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 de.unioninvestment.eai.portal.support.vaadin;

import static java.util.Arrays.asList;

import javax.portlet.MimeResponse;
import javax.portlet.PortletContext;
import javax.portlet.PortletMode;
import javax.portlet.PortletModeException;
import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;
import javax.portlet.PortletURL;
import javax.portlet.StateAwareResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.MessageSource;
import org.springframework.web.portlet.context.PortletApplicationContextUtils;

import com.vaadin.server.Page;
import com.vaadin.server.VaadinPortletService;

/**
 * Hilfsklasse für Vaadin Portlets.
 * 
 * @author carsten.mjartan
 */
public final class PortletUtils {

	private static final Logger LOGGER = LoggerFactory
			.getLogger(PortletUtils.class);

	private static org.springframework.context.ApplicationContext applicationContextMock = null;

	private PortletUtils() {
		// Utility class
	}

	/**
	 * Gibt dem Browser die Information, zu einer alternativen Ansicht des
	 * Portlets zu wechseln.
	 * 
	 * @param targetMode
	 *            der Ziel-Modus
	 * @return <code>true</code>, falls ein Wechsel erfolgen kann
	 */
	public static boolean switchPortletMode(PortletMode targetMode) {
		try {
			PortletResponse response = VaadinPortletService
					.getCurrentResponse().getPortletResponse();
			if (response instanceof MimeResponse) {
				PortletURL url = ((MimeResponse) response).createRenderURL();
				url.setPortletMode(targetMode);
				Page.getCurrent().setLocation(url.toString());
				return true;

			} else if (response instanceof StateAwareResponse) {
				((StateAwareResponse) response).setPortletMode(targetMode);
				return true;

			} else {
				LOGGER.error("Portlet mode can only be changed from a portlet request");
				return false;
			}

		} catch (IllegalStateException e) {
			// not in portlet: then don't switch back
			return false;

		} catch (PortletModeException e) {
			// not allowed: then don't switch back
			return false;
		}
	}

}