/**
    * Copyright 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.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.
   */
  
  package org.kuali.student.krms.termresolver;
  
  import org.kuali.rice.krms.api.engine.TermResolutionException;
  import org.kuali.rice.krms.api.engine.TermResolver;
  import org.kuali.student.enrollment.courseregistration.dto.CourseRegistrationInfo;
  import org.kuali.student.enrollment.courseregistration.service.CourseRegistrationService;
  import org.kuali.student.krms.util.KSKRMSExecutionConstants;
  import org.kuali.student.r2.common.dto.ContextInfo;
  import org.kuali.student.r2.common.exceptions.InvalidParameterException;
  import org.kuali.student.r2.common.exceptions.MissingParameterException;
  import org.kuali.student.r2.common.exceptions.OperationFailedException;
  import org.kuali.student.r2.common.exceptions.PermissionDeniedException;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  public class EnrolledCourseTermResolver implements TermResolver<Boolean> {
  
      private CourseRegistrationService courseRegistrationService;
  
      private final static Set<String> prerequisites = new HashSet<String>(2);
  
      static {
          prerequisites.add(KSKRMSExecutionConstants.PERSON_ID_TERM_PROPERTY);
          prerequisites.add(KSKRMSExecutionConstants.CONTEXT_INFO_TERM_NAME);
      }
  
      public CourseRegistrationService getCourseRegistrationService() {
          return courseRegistrationService;
      }
  
      public void setCourseRegistrationService(CourseRegistrationService courseRegistrationService) {
          this.courseRegistrationService = courseRegistrationService;
      }
  
      @Override
      public Set<String> getPrerequisites() {
          return prerequisites;
      }
  
      @Override
      public String getOutput() {
          return KSKRMSExecutionConstants.ENROLLED_COURSE_TERM_NAME;
      }
  
      @Override
      public Set<String> getParameterNames() {
          return Collections.singleton(KSKRMSExecutionConstants.COURSE_ID_TERM_PROPERTY);
      }
  
      @Override
      public int getCost() {
          // TODO Analyze, though probably not much to check here
          return 1;
      }
  
      @Override
      public Boolean resolve(Map<String, Object> resolvedPrereqs, Map<String, String> parameters) throws TermResolutionException {
  
          String courseOfferingIds = parameters.get(KSKRMSExecutionConstants.COURSE_ID_TERM_PROPERTY);
          Boolean result = false;
  
          courseOfferingIds = courseOfferingIds.trim();
          String[] courseOfferingId = courseOfferingIds.split(",");
          int testNumber = 0;
  
          List<CourseRegistrationInfo> registrationInfos = this.getCourseRegistrationsForStudent(resolvedPrereqs, parameters);
  
          if(courseOfferingIds.contains(",")) {
              for(CourseRegistrationInfo cri : registrationInfos) {
                  for(String cc : courseOfferingId) {
                      if(cc.equals(cri.getCourseOfferingId())){
                          testNumber++;
                      }
                  }
              }
              if(courseOfferingId.length == testNumber){
                  result = true;
              }
          } else {
              for(CourseRegistrationInfo temp : registrationInfos) {
                 if(temp.getCourseOfferingId().equals(courseOfferingIds)){
                     result = true;
                 }
             }
         }
 
         return result;
     }
 
     private List<CourseRegistrationInfo> getCourseRegistrationsForStudent(Map<String, Object> resolvedPrereqs, Map<String, String> parameters){
 
         ContextInfo context = (ContextInfo) resolvedPrereqs.get(KSKRMSExecutionConstants.CONTEXT_INFO_TERM_NAME);
         String personId = (String) resolvedPrereqs.get(KSKRMSExecutionConstants.PERSON_ID_TERM_PROPERTY);
 
         List<CourseRegistrationInfo> registrationInfos = null;
         try {
             registrationInfos = this.getCourseRegistrationService().getCourseRegistrationsByStudent(personId, context);
         } catch (InvalidParameterException e) {
             throw createTermResolutionException(e.getMessage(), parameters);
         } catch (MissingParameterException e) {
             throw createTermResolutionException(e.getMessage(), parameters);
         } catch (OperationFailedException e) {
             throw createTermResolutionException(e.getMessage(), parameters);
         } catch (PermissionDeniedException e) {
             throw createTermResolutionException(e.getMessage(), parameters);
         }
 
         return registrationInfos;
     }
 
     private TermResolutionException createTermResolutionException(String message, Map<String, String> parameters){
         return new TermResolutionException(message, this, parameters);
     }
 }