/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.edl.impl;

 import java.io.IOException;

 import javax.servlet.RequestDispatcher;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.lang.StringUtils;

 import org.apache.log4j.Logger;

 import org.kuali.rice.edl.impl.service.EdlServiceLocator;

 import org.kuali.rice.kew.api.WorkflowRuntimeException;

 import org.kuali.rice.kns.util.IncidentReportUtils;

 import org.kuali.rice.krad.UserSession;

 import org.kuali.rice.krad.exception.AuthenticationException;

 import org.kuali.rice.krad.util.GlobalVariables;

 import org.kuali.rice.krad.util.KRADConstants;

 import org.kuali.rice.krad.util.KRADUtils;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 /**

  * Takes edl web requests.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public class EDLServlet extends HttpServlet {

         private static final long serialVersionUID = -6344765194278430690L;

         private static final Logger LOG = Logger.getLogger(EDLServlet.class);

         @Override

         public void init() throws ServletException {

                 try {

                         EdlServiceLocator.getEDocLiteService().initEDLGlobalConfig();

                 } catch (Exception e) {

                         LOG.error("Error initializing EDL", e);

                 }

         }

         @Override

         protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

                 String documentId = null;

                 try {

                     UserSession userSession = KRADUtils.getUserSessionFromRequest(request);

                     if (userSession == null) {

                         throw new AuthenticationException("Failed to locate a user session for request.");

                     }

                     GlobalVariables.setUserSession(userSession);

                     RequestParser requestParser = new RequestParser(request);

                     String inputCommand = requestParser.getParameterValue("command");

                     if (StringUtils.equals(inputCommand, "initiate")){

                             requestParser.setParameterValue("userAction","initiate");

                     }

                     String edlName = requestParser.getParameterValue("edlName");

                     if (edlName == null) {

                         edlName = requestParser.getParameterValue("docTypeName");//this is for 'WorkflowQuicklinks'

                     }

                     EDLController edlController = null;

                     if (edlName == null) {

                         documentId = requestParser.getParameterValue("docId");

                         if (documentId == null) {

                                 String docFormKey = requestParser.getParameterValue(KRADConstants.DOC_FORM_KEY);

                                 if (docFormKey != null) {

                                         Document document = (Document) GlobalVariables.getUserSession().retrieveObject(docFormKey);

                                         Element documentState = EDLXmlUtils.getDocumentStateElement(document);

                                         documentId = EDLXmlUtils.getChildElementTextValue(documentState, "docId");

                                         requestParser.setAttribute(KRADConstants.DOC_FORM_KEY, docFormKey);

                                 }

                                 if (documentId == null) {

                                         throw new WorkflowRuntimeException("No edl name or document id detected");

                                 }

                         }

                         requestParser.setAttribute("docId", documentId);

                         edlController = EdlServiceLocator.getEDocLiteService().getEDLControllerUsingDocumentId(documentId);

                     } else {

                         edlController = EdlServiceLocator.getEDocLiteService().getEDLControllerUsingEdlName(edlName);

                     }

                     //TODO Fix this in a better way (reworking the command structure maybe?)

                     //fix for KULRICE-4057 to make sure we don't destory docContent on empty command params

                     if(inputCommand == null && requestParser.getParameterValue("docId") != null && !"POST".equals(request.getMethod())){

                             //make sure these are the only params on the request (paging passed undefined input command as well...

                             if(!(request.getParameterMap().size() > 2)){//ensures ONLY documentId was passed

                                     requestParser.setParameterValue("command", "displayDocSearchView");

                                     LOG.info("command parameter was not passed with the request, and only document ID was. Defaulted command to 'displayDocSearchView' to ensure docContent remains.");

                             }

                     }

                     EDLControllerChain controllerChain = new EDLControllerChain();

                     controllerChain.addEdlController(edlController);

                         //TODO Do we not want to set the content type for the response?                   

                     controllerChain.renderEDL(requestParser, response);

                 } catch (Exception e) {

                         LOG.error("Error processing EDL", e);

                         outputError(request, response, e, documentId);

                 } finally {

                     GlobalVariables.setUserSession(null);

                 }

         }

         private void outputError(HttpServletRequest request, HttpServletResponse response, Exception exception, String documentId) throws ServletException, IOException {

                         IncidentReportUtils.populateRequestForIncidentReport(exception, "" + documentId, "eDoc Lite", request);

                 RequestDispatcher rd = getServletContext().getRequestDispatcher(request.getServletPath() + "/../../kr/kualiExceptionIncidentReport.do");

                 rd.forward(request, response);

         }

 }