/**
    * Copyright 2012 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.osedu.org/licenses/ECL-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 by vgadiyak on 5/29/12
   */
  package org.kuali.student.enrollment.class2.courseoffering.rule;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.util.RiceKeyConstants;
  import org.kuali.rice.krad.maintenance.MaintenanceDocument;
  import org.kuali.rice.krad.rules.MaintenanceDocumentRuleBase;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.util.KRADConstants;
  import org.kuali.student.enrollment.class2.courseoffering.dto.CourseOfferingCreateWrapper;
  import org.kuali.student.enrollment.class2.courseoffering.dto.CourseOfferingEditWrapper;
  import org.kuali.student.enrollment.class2.courseoffering.util.CourseOfferingConstants;
  import org.kuali.student.enrollment.class2.courseoffering.util.CourseOfferingResourceLoader;
  import org.kuali.student.enrollment.courseoffering.dto.CourseOfferingInfo;
  import org.kuali.student.enrollment.courseoffering.service.CourseOfferingService;
  import org.kuali.student.r2.common.util.ContextUtils;
  
  import java.util.List;
  
  /**
   * This class //TODO ...
   *
   * @author Kuali Student Team
   */
  public class CourseOfferingEditRule extends MaintenanceDocumentRuleBase {
  
         private CourseOfferingService courseOfferingService;
  
      private final static String EXISTING_CO_CODE_FOUND_ERROR = "That Course Offering Code is already in use.  Please enter a different, unique Course Offering Code for ";
  
      @Override
      protected boolean processGlobalSaveDocumentBusinessRules(MaintenanceDocument document) {
          boolean valid = true;
  
          if (document.getNewMaintainableObject().getDataObject() instanceof CourseOfferingEditWrapper){
              CourseOfferingEditWrapper newCOWrapper = (CourseOfferingEditWrapper)document.getNewMaintainableObject().getDataObject();
              CourseOfferingEditWrapper oldCOWrapper = (CourseOfferingEditWrapper)document.getOldMaintainableObject().getDataObject();
  
              // Only perform validateDuplicateSuffix check when CO code suffix part is changed, the code itself is readOnly and can't be modified at all.
              // also notice a problem: the suffix of a CO from OldMaintainableObject (the DB reference dataset) could be null
              // while even we didn't modify suffix in edit CO page, the suffix value in NewMaintainableObject became an empty string
              String newSuffix = newCOWrapper.getCoInfo().getCourseNumberSuffix(); 
              String oldSuffix = oldCOWrapper.getCoInfo().getCourseNumberSuffix();
              if ((oldSuffix == null || oldSuffix.isEmpty()) && 
                  (newSuffix == null || newSuffix.isEmpty())) {
                  return valid;
              }else if ((newSuffix != null) && !newSuffix.equals(oldSuffix) ) {
                  validateDuplicateSuffix(newCOWrapper);
              }
          }
  
          return valid;
      }
  
  
      protected boolean validateDuplicateSuffix(CourseOfferingEditWrapper coWrapper){
          // Catalog course code is case INSENSITIVE, but the suffix is case SENSITIVE
          String newCoCode = (coWrapper.getCourse().getCode().toUpperCase()) + coWrapper.getCoInfo().getCourseNumberSuffix();
  
          try {
              List<CourseOfferingInfo> wrapperList = getCourseOfferingService().getCourseOfferingsByCourseAndTerm(coWrapper.getCourse().getId(), coWrapper.getCoInfo().getTermId(), ContextUtils.createDefaultContextInfo());
              for (CourseOfferingInfo courseOfferingInfo : wrapperList) {
  
                  if (StringUtils.equals(newCoCode, courseOfferingInfo.getCourseOfferingCode())) {
                      StringBuilder sb = new StringBuilder(EXISTING_CO_CODE_FOUND_ERROR);
                      sb.append(coWrapper.getCourse().getCode());
                      GlobalVariables.getMessageMap().putError(KRADConstants.GLOBAL_ERRORS, RiceKeyConstants.ERROR_CUSTOM, sb.toString());
                      return false;
                  }
              }
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
          return true;
      }
  
      protected CourseOfferingService getCourseOfferingService() {
          if (courseOfferingService == null) {
              courseOfferingService = CourseOfferingResourceLoader.loadCourseOfferingService();
          }
          return courseOfferingService;
      }
  }