/**
    * Copyright 2005-2013 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.krad.web.controller;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.log4j.Logger;
  import org.kuali.rice.krad.UserSession;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.uif.UifConstants;
  import org.kuali.rice.krad.uif.UifParameters;
  import org.kuali.rice.krad.uif.view.History;
  import org.kuali.rice.krad.uif.view.HistoryEntry;
  import org.kuali.rice.krad.uif.service.ViewService;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.util.KRADConstants;
  import org.kuali.rice.krad.util.KRADUtils;
  import org.kuali.rice.krad.web.form.DocumentFormBase;
  import org.kuali.rice.krad.web.form.IncidentReportForm;
  import org.kuali.rice.krad.web.form.UifFormBase;
  import org.springframework.web.servlet.ModelAndView;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * Spring Exception intercepter
   *
   * <p>
   * Gets the data needed for the incident report from the request and builds the
   * model and view for the incident report. This resolver intercepts any unhandled
   * exception.
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class UifHandlerExceptionResolver implements org.springframework.web.servlet.HandlerExceptionResolver {
      private static final Logger LOG = Logger.getLogger(UifHandlerExceptionResolver.class);
  
      /**
       * Builds the incident report model and view from the request that threw the exception
       *
       * @param request -
       *            the request
       * @param response -
       *            the response
       * @param handler -
       *            the current handler when the exception occurred
       * @param ex -
       *            the exception
       * @return the incident report model and view
       * @see org.springframework.web.servlet.HandlerExceptionResolver#resolveException(javax.servlet.http.HttpServletRequest,
       *      javax.servlet.http.HttpServletResponse, java.lang.Object,
       *      java.lang.Exception)
       */
      @Override
      public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
              Exception ex) {
          LOG.error("The following error was caught by the UifHandlerExceptionResolver : ", ex);
  
          // log exception
          LOG.error(ex.getMessage(), ex);
  
          String incidentDocId = request.getParameter(KRADConstants.DOCUMENT_DOCUMENT_NUMBER);
          String incidentViewId = "";
  
          UifFormBase form = (UifFormBase)request.getAttribute(UifConstants.REQUEST_FORM);
          if (form instanceof DocumentFormBase) {
              if (((DocumentFormBase) form).getDocument() != null) {
                  incidentDocId = ((DocumentFormBase) form).getDocument().getDocumentNumber();
              }
              incidentViewId = ((DocumentFormBase) form).getViewId();
          }
          GlobalVariables.getUifFormManager().removeSessionForm(form);
  
          UserSession userSession = (UserSession) request.getSession().getAttribute(KRADConstants.USER_SESSION_KEY);
          IncidentReportForm incidentReportForm = new IncidentReportForm();
  
          // Set the post url map to the incident report controller and not 
          // the one the exception occurred on
          String postUrl = request.getRequestURL().toString();
          postUrl = postUrl.substring(0, postUrl.lastIndexOf("/")) + "/incidentReport";
          incidentReportForm.setFormPostUrl(postUrl);
  
          incidentReportForm.setException(ex);
          incidentReportForm.setIncidentDocId(incidentDocId);
          incidentReportForm.setIncidentViewId(incidentViewId);
         incidentReportForm.setController(handler.getClass().toString());
         incidentReportForm.setUserId(userSession.getPrincipalId());
         incidentReportForm.setUserName(userSession.getPrincipalName());
         incidentReportForm.setUserEmail(userSession.getPerson().getEmailAddress());
         incidentReportForm.setDevMode(!KRADUtils.isProductionEnvironment());
         incidentReportForm.setViewId("Uif-IncidentReportView");
 
         if (form != null) {
             incidentReportForm.setAjaxRequest(form.isAjaxRequest());
         } else {
             String ajaxRequestParm = request.getParameter(UifParameters.AJAX_REQUEST);
             if (StringUtils.isNotBlank(ajaxRequestParm)) {
                 incidentReportForm.setAjaxRequest(Boolean.parseBoolean(ajaxRequestParm));
             }
         }
 
         // Set the view object
         incidentReportForm.setView(getViewService().getViewById("Uif-IncidentReportView"));
 
         // Add a new History entry to avoid errors in the postHandle
         History history = new History();
         HistoryEntry entry = new HistoryEntry("", "", "Incident Report", "", "");
         history.setCurrent(entry);
         incidentReportForm.setFormHistory(history);
 
         // Set the ajax return type
         incidentReportForm.setAjaxReturnType(UifConstants.AjaxReturnTypes.UPDATEVIEW.getKey());
 
         ModelAndView modelAndView = UifControllerHelper.getUIFModelAndView(incidentReportForm, "");
         try {
             UifControllerHelper.postControllerHandle(request, response, handler, modelAndView);
         } catch (Exception e) {
             LOG.error("An error stopped the incident form from loading", e);
         }
 
         return modelAndView;
     }
 
     protected ViewService getViewService() {
         return KRADServiceLocatorWeb.getViewService();
     }
 
 }