/**
    * Copyright 2005-2014 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.service.impl;
  
  import org.kuali.rice.kim.api.identity.Person;
  import org.kuali.rice.krad.exception.AuthorizationException;
  import org.kuali.rice.krad.uif.view.View;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.web.form.UifFormBase;
  import org.kuali.rice.krad.web.service.ControllerService;
  import org.kuali.rice.krad.web.service.ModelAndViewService;
  import org.kuali.rice.krad.web.service.NavigationControllerService;
  import org.springframework.web.servlet.ModelAndView;
  
  /**
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ControllerServiceImpl implements ControllerService {
  
      private ModelAndViewService modelAndViewService;
      private NavigationControllerService navigationControllerService;
  
      /**
       * {@inheritDoc}
       */
      @Override
      public ModelAndView start(UifFormBase form) {
          checkViewAuthorization(form);
  
          if (form.getView() != null) {
              form.setApplyDefaultValues(true);
          }
  
          return getModelAndViewService().getModelAndView(form);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void checkViewAuthorization(UifFormBase form) throws AuthorizationException {
          // if user session or view not established we cannnot authorize the view request
          View view = form.getView();
          if ((GlobalVariables.getUserSession() == null) || view == null) {
              return;
          }
  
          Person user = GlobalVariables.getUserSession().getPerson();
          boolean viewAuthorized = view.getAuthorizer().canOpenView(view, form, user);
  
          if (!viewAuthorized) {
              throw new AuthorizationException(user.getPrincipalName(), "open", view.getId(),
                      "User '" + user.getPrincipalName() + "' is not authorized to open view ID: " +
                              view.getId(), null);
          }
      }
  
      /**
       * Default impl does nothing but render the view.
       *
       * {@inheritDoc}
       */
      @Override
      public ModelAndView sessionTimeout(UifFormBase form) {
          return getModelAndViewService().getModelAndView(form);
      }
  
      /**
       * Navigates back to a previous point (depending on how the view was requested).
       *
       * {@inheritDoc}
       * org.kuali.rice.krad.web.service.impl.NavigationControllerServiceImpl#back(org.kuali.rice.krad.web.form.UifFormBase,
       * boolean)
       */
      @Override
      public ModelAndView cancel(UifFormBase form) {
          GlobalVariables.getUifFormManager().removeSessionForm(form);
  
          return getNavigationControllerService().returnToHistory(form, false, false, true);
      }
  
      protected ModelAndViewService getModelAndViewService() {
          return modelAndViewService;
      }
  
      public void setModelAndViewService(ModelAndViewService modelAndViewService) {
         this.modelAndViewService = modelAndViewService;
     }
 
     protected NavigationControllerService getNavigationControllerService() {
         return navigationControllerService;
     }
 
     public void setNavigationControllerService(NavigationControllerService navigationControllerService) {
         this.navigationControllerService = navigationControllerService;
     }
 }