/**
 * Copyright (c) 2009 Juwi MacMillan Group GmbH
 *
 * 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.
 */
/*
 * Created on 20.10.2004
 */
package de.juwimm.cms.cocoon.acting;

import java.util.HashMap;
import java.util.Map;

import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.thread.SingleThreaded;
import org.apache.cocoon.acting.AbstractAction;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Redirector;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.log4j.Logger;

import de.juwimm.cms.beans.WebServiceSpring;
import de.juwimm.cms.cocoon.helper.CocoonSpringHelper;

/**
 * An <code>Action</code> that matches a string from within the host parameter of the HTTP request.</br>
 * This action searches for the host parameter in the database and returns the startpage-url for this host to the sitemap.</br>
 * <p><h5>Configuration:</h5>
 * <pre>
 * <map:action name="cms.actions.hoststartpage" src="de.juwimm.cms.cocoon.acting.HostStartPageAction"/>
 * </pre>
 * </p>
 * <p><h5>Usage:</h5>
 * <pre>
 * <map:match pattern="whatever">
 *     <map:act type="cms.actions.hoststartpage">
 *         <map:select type="parameter">
 *             <map:parameter name="parameter-selector-test" value="{startpageURL}"/>
 *             <map:when test="0">
 *                 <!-- host does not have a startpage configured -->
 *             </map:when>
 *             <map:otherwise>
 *                 <!-- host points to {startpageURL} -->
 *             </map:otherwise>
 *         </map:select>
 *     </map:act>
 * </map:match>
 * </pre>
 * </p>
 * <p><h5>Result:</h5>The action returns only one value as parameters to the sitemap:</br>
 * <ul>
 * <li>startpageURL - the startpage-url for this host the main-sitemap would normally redirect to if the request-path is empty. If no url is found this value equals "0".</li> 
 * </ul>
 * This action returns "null" if the request does not contain a host value, the host is empty, the host isn't found in the database or the host is 127.0.0.1 or "localhost".
 * </p>
 * 
 * @author <a href="mailto:carsten.schalm@juwimm.com">Carsten Schalm</a>
 * company Juwi|MacMillan Group Gmbh, Walsrode, Germany
 * @version $Id$
 * @since ConQuest 2.4.12
 */
public class HostStartPageAction extends AbstractAction implements SingleThreaded {
	private Logger log = Logger.getLogger(HostStartPageAction.class);
	private WebServiceSpring webSpringBean = null;
	private static final String STARTPAGE_URL = "startpageURL";

	public HostStartPageAction() {

	}

	public Map act(Redirector redirector, SourceResolver resolver, Map objectModel, String source, Parameters parameters) throws Exception {
		if (log.isDebugEnabled()) log.debug("start acting");
		try {
			webSpringBean = (WebServiceSpring) CocoonSpringHelper.getBean(objectModel, CocoonSpringHelper.WEB_SERVICE_SPRING);
		} catch (Exception exf) {
			log.error("Could not load WebServiceSpring!", exf);
		}
		Map<String, String> sitemapParams = new HashMap<String, String>();
		// Get the host request header
		Request request = ObjectModelHelper.getRequest(objectModel);
		String host = request.getHeader("Host");
		int portPosition = host.lastIndexOf(":");
		if (portPosition > 0) {
			host = host.substring(0, portPosition);
		}
		if (host == null) {
			if (log.isDebugEnabled()) log.debug("No Host header -- failing.");
			return null;
		} else if ("".equalsIgnoreCase(host)) {
			if (log.isDebugEnabled()) log.debug("Host header empty -- failing.");
			return null;
		} else if ("127.0.0.1".equalsIgnoreCase(host) || "localhost".equalsIgnoreCase(host)) {
			if (log.isDebugEnabled()) log.debug("Host \"localhost\" -- skipping...");
			return null;
		} else {
			if (log.isDebugEnabled()) log.debug("found host: " + host);
			String startPageUrl = this.webSpringBean.getStartPage(host);
			if (log.isDebugEnabled()) {
				log.debug("found " + HostStartPageAction.STARTPAGE_URL + ": " + startPageUrl);
			}
			if ("".equalsIgnoreCase(startPageUrl)) {
				startPageUrl = "0";
			}
			sitemapParams.put(HostStartPageAction.STARTPAGE_URL, startPageUrl);
		}
		if (log.isDebugEnabled()) log.debug("finished acting");
		return sitemapParams;
	}

}