/**
    * 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.ActivityOffering;
  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.core.scheduling.constants.SchedulingServiceConstants;
  import org.kuali.student.r2.core.scheduling.dto.ScheduleComponentInfo;
  import org.kuali.student.r2.core.scheduling.dto.ScheduleInfo;
  import org.kuali.student.r2.core.scheduling.dto.TimeSlotInfo;
  import org.kuali.student.r2.core.scheduling.service.SchedulingService;
  import org.kuali.student.r2.core.scheduling.util.SchedulingServiceUtil;
  
  import java.util.Calendar;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Return true if student has an unsubmitted registration request that includes
   * the given course or if the student is currently enrolled for the given course.
   *
   * Example rule statement:
   * 1) Must be concurrently enrolled in all courses from <courses>
   *
   * @author Kuali Student Team
   */
  public class MatchingTimeSlotTermResolver implements TermResolver<Boolean> {
  
      private CourseOfferingService courseOfferingService;
      private SchedulingService schedulingService;
  
      @Override
      public Set<String> getPrerequisites() {
          Set<String> prereqs = new HashSet<String>(2);
          prereqs.add(KSKRMSServiceConstants.TERM_PREREQUISITE_AO_ID);
          prereqs.add(KSKRMSServiceConstants.TERM_PREREQUISITE_CONTEXTINFO);
          return Collections.unmodifiableSet(prereqs);
      }
  
      @Override
      public String getOutput() {
          return KSKRMSServiceConstants.TERM_RESOLVER_MATCHINGTIMESLOT;
      }
  
      @Override
      public Set<String> getParameterNames() {
          Set<String> temp = new HashSet<String>(3);
          temp.add(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_TIMESLOT_WEEKDAY_STRING);
          temp.add(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_TIMESLOT_START);
          temp.add(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_TIMESLOT_END);
          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 weekdays = parameters.get(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_TIMESLOT_WEEKDAY_STRING);
          String startTime = parameters.get(KSKRMSServiceConstants.TERM_PARAMETER_TYPE_TIMESLOT_START);
  
          try {
              ActivityOffering ao = this.retrieveActivityOffering(resolvedPrereqs, context);
              List<ScheduleInfo> schedules = this.getSchedulingService().getSchedulesByIds(ao.getScheduleIds(), context);
              for(ScheduleInfo schedule : schedules){
                  for(ScheduleComponentInfo scheduleComponent : schedule.getScheduleComponents()){
                      List<TimeSlotInfo> timeSlots = this.getSchedulingService().getTimeSlotsByIds(scheduleComponent.getTimeSlotIds(), context);
                      for(TimeSlotInfo timeSlot : timeSlots){
                          if(weekdays.equals(SchedulingServiceUtil.weekdaysList2WeekdaysString(timeSlot.getWeekdays()))
                                 && Long.valueOf(startTime).equals(timeSlot.getStartTime().getMilliSeconds())){
                             return true;
                         }
                     }
                 }
             }
 
 
         } catch (Exception e) {
             KSKRMSExecutionUtil.convertExceptionsToTermResolutionException(parameters, e, this);
         }
 
         return false;
     }
 
     private ActivityOffering retrieveActivityOffering(Map<String, Object> resolvedPrereqs, ContextInfo context)
             throws PermissionDeniedException, MissingParameterException, InvalidParameterException, OperationFailedException,
             DoesNotExistException {
 
         ActivityOffering ao = (ActivityOffering) resolvedPrereqs.get(KSKRMSServiceConstants.TERM_PREREQUISITE_AO);
         if(ao == null){
             String aoId = (String) resolvedPrereqs.get(KSKRMSServiceConstants.TERM_PREREQUISITE_AO_ID);
             ao = this.getCourseOfferingService().getActivityOffering(aoId, context);
             resolvedPrereqs.put(KSKRMSServiceConstants.TERM_PREREQUISITE_AO, ao);
         }
 
         return ao;
     }
 
     public CourseOfferingService getCourseOfferingService() {
         return courseOfferingService;
     }
 
     public void setCourseOfferingService(CourseOfferingService courseOfferingService) {
         this.courseOfferingService = courseOfferingService;
     }
 
     public SchedulingService getSchedulingService() {
         return schedulingService;
     }
 
     public void setSchedulingService(SchedulingService schedulingService) {
         this.schedulingService = schedulingService;
     }
 }