/**
    * 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.enrollment.class2.examoffering.krms.termresolver;
  
  import org.kuali.rice.krms.api.engine.TermResolutionException;
  import org.kuali.rice.krms.api.engine.TermResolver;
  import org.kuali.student.enrollment.courseoffering.infc.CourseOffering;
  import org.kuali.student.enrollment.courseoffering.service.CourseOfferingService;
  import org.kuali.student.r2.common.dto.ContextInfo;
  import org.kuali.student.r2.common.exceptions.DoesNotExistException;
  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 org.kuali.student.r2.common.krms.util.KSKRMSExecutionUtil;
  import org.kuali.student.r2.core.constants.KSKRMSServiceConstants;
  import org.kuali.student.r2.lum.course.infc.Course;
  import org.kuali.student.r2.lum.course.service.CourseService;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Return true if course offering is associated with course.
   *
   * Example rule statement:
   * 1) Must be concurrently enrolled in all courses from <courses>
   *
   * @author Kuali Student Team
   */
  public class MatchingCourseTermResolver implements TermResolver<Boolean> {
  
      private CourseOfferingService courseOfferingService;
      private CourseService courseService;
  
      @Override
      public Set<String> getPrerequisites() {
          Set<String> prereqs = new HashSet<String>(2);
          prereqs.add(KSKRMSServiceConstants.TERM_PREREQUISITE_CO_ID);
          prereqs.add(KSKRMSServiceConstants.TERM_PREREQUISITE_CONTEXTINFO);
          return Collections.unmodifiableSet(prereqs);
      }
  
      @Override
      public String getOutput() {
          return KSKRMSServiceConstants.TERM_RESOLVER_MATCHINGCOURSE;
      }
  
      @Override
      public Set<String> getParameterNames() {
          Set<String> temp = new HashSet<String>(3);
          temp.add(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_CLU_KEY);
          return Collections.unmodifiableSet(temp);
      }
  
      @Override
      public int getCost() {
          return 5;
      }
  
      @Override
      public Boolean resolve(Map<String, Object> resolvedPrereqs, Map<String, String> parameters) throws TermResolutionException {
          ContextInfo context = (ContextInfo) resolvedPrereqs.get(KSKRMSServiceConstants.TERM_PREREQUISITE_CONTEXTINFO);
  
          String courseId = parameters.get(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_CLU_KEY);
  
          try {
              CourseOffering co = this.retrieveCourseOffering(resolvedPrereqs, context);
              Course course = this.getCourseService().getCourse(co.getCourseId(), context);
  
              if(courseId.equals(course.getVersion().getVersionIndId())){
                  return true;
              }
  
          } catch (Exception e) {
              KSKRMSExecutionUtil.convertExceptionsToTermResolutionException(parameters, e, this);
          }
  
          return false;
      }
  
      private CourseOffering retrieveCourseOffering(Map<String, Object> resolvedPrereqs, ContextInfo context)
              throws PermissionDeniedException, MissingParameterException, InvalidParameterException, OperationFailedException,
              DoesNotExistException {
 
         CourseOffering co = (CourseOffering) resolvedPrereqs.get(KSKRMSServiceConstants.TERM_PREREQUISITE_CO);
         if(co == null){
             String coId = (String) resolvedPrereqs.get(KSKRMSServiceConstants.TERM_PREREQUISITE_CO_ID);
             co = this.getCourseOfferingService().getCourseOffering(coId, context);
             resolvedPrereqs.put(KSKRMSServiceConstants.TERM_PREREQUISITE_CO, co);
         }
 
         return co;
     }
 
     public CourseOfferingService getCourseOfferingService() {
         return courseOfferingService;
     }
 
     public void setCourseOfferingService(CourseOfferingService courseOfferingService) {
         this.courseOfferingService = courseOfferingService;
     }
 
     public CourseService getCourseService() {
         return courseService;
     }
 
     public void setCourseService(CourseService courseService) {
         this.courseService = courseService;
     }
 }