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 package org.kuali.student.enrollment.class2.courseoffering.service.impl;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Collections;

 import java.util.List;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.student.enrollment.acal.service.AcademicCalendarService;

 import org.kuali.student.enrollment.class2.courseoffering.service.decorators.R1CourseServiceHelper;

 import org.kuali.student.enrollment.class2.courseoffering.service.transformer.CourseOfferingTransformer;

 import org.kuali.student.enrollment.courseoffering.dto.ActivityOfferingInfo;

 import org.kuali.student.enrollment.courseoffering.dto.CourseOfferingInfo;

 import org.kuali.student.enrollment.courseoffering.dto.FormatOfferingInfo;

 import org.kuali.student.enrollment.courseoffering.dto.OfferingInstructorInfo;

 import org.kuali.student.enrollment.courseoffering.service.CourseOfferingService;

 import org.kuali.student.enrollment.courseoffering.service.CourseOfferingServiceBusinessLogic;

 import org.kuali.student.lum.course.dto.CourseInfo;

 import org.kuali.student.lum.course.service.CourseService;

 import org.kuali.student.r2.common.dto.AttributeInfo;

 import org.kuali.student.r2.common.dto.ContextInfo;

 import org.kuali.student.r2.common.dto.ValidationResultInfo;

 import org.kuali.student.r2.common.exceptions.AlreadyExistsException;

 import org.kuali.student.r2.common.exceptions.DataValidationErrorException;

 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.exceptions.ReadOnlyException;

 import org.kuali.student.r2.common.exceptions.VersionMismatchException;

 import org.kuali.student.r2.common.infc.ValidationResult.ErrorLevel;

 import org.kuali.student.r2.common.util.constants.CourseOfferingServiceConstants;

 import org.kuali.student.r2.common.util.constants.CourseOfferingSetServiceConstants;

 import javax.xml.namespace.QName;

 /**

  *

  * @author nwright

  */

 public class CourseOfferingServiceBusinessLogicImpl implements CourseOfferingServiceBusinessLogic  {

     private CourseService courseService;

     private AcademicCalendarService acalService;

     private CourseOfferingService coService;

     public CourseOfferingService getCoService() {

         return coService;

     }

     public void setCoService(CourseOfferingService coService) {

         this.coService = coService;

     }

     public AcademicCalendarService getAcalService() {

         return acalService;

     }

     public void setAcalService(AcademicCalendarService acalService) {

         this.acalService = acalService;

     }

     public CourseService getCourseService() {

         return courseService;

     }

     public void setCourseService(CourseService courseService) {

         this.courseService = courseService;

     }

     private CourseOfferingService _getCoService() {

         if (coService == null) {

             coService = (CourseOfferingService) GlobalResourceLoader.getService(new QName(CourseOfferingServiceConstants.NAMESPACE,

                     CourseOfferingServiceConstants.SERVICE_NAME_LOCAL_PART));

         }

         return coService;

     }

     @Override

     public CourseOfferingInfo rolloverCourseOffering(String sourceCoId,

             String targetTermId,

             List<String> optionKeys,

             ContextInfo context) throws AlreadyExistsException,

             DataValidationErrorException, DoesNotExistException, DataValidationErrorException, InvalidParameterException,

             MissingParameterException, OperationFailedException, PermissionDeniedException, ReadOnlyException {

         CourseOfferingInfo sourceCo = this._getCoService().getCourseOffering(sourceCoId, context);

         if (optionKeys.contains(CourseOfferingSetServiceConstants.IGNORE_CANCELLED_OPTION_KEY)) {

             throw new DataValidationErrorException("Skipped because course offering was cancelled in source term");

         }

         R1CourseServiceHelper helper = new R1CourseServiceHelper(courseService, acalService);

         CourseInfo sourceCourse = helper.getCourse(sourceCo.getCourseId());

         String sourceCourseId = sourceCourse.getId();

         List<CourseInfo> targetCourses = helper.getCoursesForTerm(sourceCourseId, targetTermId, context);

         if (targetCourses.isEmpty()) {

             throw new InvalidParameterException("Skipped because there is no valid version of the course in the target term");

         }

         if (targetCourses.size() > 1) {

             throw new InvalidParameterException(

                     "Skipped because there are more than one valid versions of the course in the target term");

         }

         CourseInfo targetCourse = targetCourses.get(0);

         if (optionKeys.contains(CourseOfferingSetServiceConstants.SKIP_IF_ALREADY_EXISTS_OPTION_KEY)) {

             String existingCoId = this.findFirstExistingCourseOfferingIdInTargetTerm(targetCourse.getId(), targetTermId, context);

             if (existingCoId != null) {

                 throw new AlreadyExistsException("Skipped because course offering already exists in target term");

             }

         }

         // TODO: Not hard code "Active" but use a constant ... except these are R1 States

         if (optionKeys.contains(CourseOfferingSetServiceConstants.STILL_OFFERABLE_OPTION_KEY)) {

             if (!targetCourse.getState().equals("Active")) {

                 throw new DataValidationErrorException("skipped because canonical course is no longer active");

             }

         }

         if (optionKeys.contains(CourseOfferingSetServiceConstants.IF_NO_NEW_VERSION_OPTION_KEY)) {

             if (!sourceCourse.getId().equals(targetCourse.getId())) {

                 throw new DataValidationErrorException("skipped because there is a new version of the canonical course");

             }

         }

         CourseOfferingInfo targetCo = new CourseOfferingInfo(sourceCo);

         targetCo.setId(null);

         // clear out the ids on the internal sub-objects too

         for (OfferingInstructorInfo instr : targetCo.getInstructors()) {

             instr.setId(null);

         }

 //        for (RevenueInfo rev : targetCo.getRevenues()) {

 //            rev.setId(null);

 //        }

 //        for (FeeInfo fee : targetCo.getFees()) {

 //            fee.setId(null);

 //        }

         for (AttributeInfo attr : targetCo.getAttributes()) {

             attr.setId(null);

         }

         targetCo.setTermId(targetTermId);

         targetCo.setMeta(null);

         if (optionKeys.contains(CourseOfferingSetServiceConstants.NO_INSTRUCTORS_OPTION_KEY)) {

             targetCo.getInstructors().clear();

         }

         targetCo.setCourseId(targetCourse.getId());

         if (optionKeys.contains(CourseOfferingSetServiceConstants.USE_CANNONICAL_OPTION_KEY)) {

             // copy from cannonical

             CourseOfferingTransformer coTransformer = new CourseOfferingTransformer();

             coTransformer.copyFromCanonical(targetCourse, targetCo, optionKeys);

         }

         targetCo = this._getCoService().createCourseOffering(targetCo.getCourseId(), targetCo.getTermId(), targetCo.getTypeKey(),

                 targetCo, optionKeys, context);

         for (FormatOfferingInfo sourceFo : this._getCoService().getFormatOfferingsByCourseOffering(sourceCo.getId(), context)) {

             FormatOfferingInfo targetFo = new FormatOfferingInfo(sourceFo);

             targetFo.setId(null);

             // clear out the ids on the internal sub-objects

             for (AttributeInfo attr : targetFo.getAttributes()) {

                 attr.setId(null);

             }

             targetFo.setCourseOfferingId(targetCo.getId());

             targetFo.setTermId(targetTermId);

             targetFo.setMeta(null);

             CourseOfferingService locoService = this.getCoService();

             targetFo = locoService.createFormatOffering(targetFo.getCourseOfferingId(), targetFo.getFormatId(),

                     targetFo.getTypeKey(), targetFo, context);

             for (ActivityOfferingInfo sourceAo : locoService.getActivityOfferingsByFormatOffering(sourceFo.getId(), context)) {

                 ActivityOfferingInfo targetAo = new ActivityOfferingInfo(sourceAo);

                 targetAo.setId(null);

                 // clear out the ids on the internal sub-objects

                 for (AttributeInfo attr : targetAo.getAttributes()) {

                     attr.setId(null);

                 }

                 for (OfferingInstructorInfo instr : targetAo.getInstructors()) {

                     instr.setId(null);

                 }

                 targetAo.setFormatOfferingId(targetFo.getId());

                 targetAo.setTermId(targetTermId);

                 targetAo.setMeta(null);

                 if (optionKeys.contains(CourseOfferingSetServiceConstants.NO_SCHEDULE_OPTION_KEY)) {

                     targetAo.setScheduleId(null);

                     // TODO: set the schedule request to null as well

                 }

                 if (optionKeys.contains(CourseOfferingSetServiceConstants.NO_INSTRUCTORS_OPTION_KEY)) {

                     targetAo.getInstructors().clear();

                 }

                 targetAo = this._getCoService().createActivityOffering(targetAo.getFormatOfferingId(), targetAo.getActivityId(),

                         targetAo.getTypeKey(), targetAo, context);

             }

         }

         return targetCo;

     }

     @Override

     public CourseOfferingInfo updateCourseOfferingFromCanonical(String courseOfferingId, List<String> optionKeys, ContextInfo context)

             throws DataValidationErrorException,

             DoesNotExistException, InvalidParameterException, MissingParameterException, OperationFailedException,

             PermissionDeniedException, VersionMismatchException {

         CourseOfferingInfo co = this._getCoService().getCourseOffering(courseOfferingId, context);

         CourseInfo course = new R1CourseServiceHelper(courseService, acalService).getCourse(co.getCourseId());

         // copy from cannonical

         CourseOfferingTransformer coTransformer = new CourseOfferingTransformer();

         coTransformer.copyFromCanonical(course, co, optionKeys);

         try {

             return this._getCoService().updateCourseOffering(courseOfferingId, co, context);

         } catch (ReadOnlyException ex) {

             throw new OperationFailedException("unexpected", ex);

         }

         // TODO: continue traversing down the formats and activities updating from the canonical

     }

     @Override

     public List<ValidationResultInfo> validateCourseOfferingFromCanonical(CourseOfferingInfo courseOfferingInfo,

             List<String> optionKeys, ContextInfo context) throws DoesNotExistException,

             InvalidParameterException, MissingParameterException, OperationFailedException {

         List<ValidationResultInfo> results = new ArrayList<ValidationResultInfo>();

         CourseInfo course = new R1CourseServiceHelper(courseService, acalService).getCourse(courseOfferingInfo.getCourseId());

         if (!optionKeys.contains(CourseOfferingSetServiceConstants.NOT_COURSE_TITLE_OPTION_KEY)) {

             results.addAll(this.compare("CourseTitle", course.getCourseTitle(), courseOfferingInfo.getCourseOfferingTitle(), null));

         }

         results.addAll(this.compare("Code", course.getCode(), courseOfferingInfo.getCourseOfferingCode(), null));

         if (optionKeys.contains(CourseOfferingSetServiceConstants.CREDITS_MATCH_SCHEDULED_HOURS_OPTION_KEY)) {

             results.addAll(compareCreditsToSchedule(course, courseOfferingInfo));

         }

         return results;

     }

     private List<ValidationResultInfo> compare(String element, String courseValue, String coValue, String message) {

         if (courseValue == null && coValue == null) {

             return Collections.EMPTY_LIST;

         }

         if (courseValue.equals(coValue)) {

             return Collections.EMPTY_LIST;

         }

         ValidationResultInfo result = new ValidationResultInfo();

         result.setElement(element);

         result.setLevel(ErrorLevel.ERROR);

         result.setMessage(message);

         return Arrays.asList(result);

     }

     protected List<ValidationResultInfo> compareCreditsToSchedule(CourseInfo course, CourseOfferingInfo co) {

         // TODO: implement this complex logic

         // This is protected because it is explected that implementing instituations will vary widely in this implementation

         return Collections.EMPTY_LIST;

     }

     private String findFirstExistingCourseOfferingIdInTargetTerm(String targetCourseId, String targetTermId, ContextInfo context)

             throws DoesNotExistException, OperationFailedException {

         List<CourseOfferingInfo> list;

         try {

             list = this._getCoService().getCourseOfferingsByCourseAndTerm(targetCourseId, targetTermId, context);

         } catch (InvalidParameterException ex) {

             throw new OperationFailedException("unexpected", ex);

         } catch (MissingParameterException ex) {

             throw new OperationFailedException("unexpected", ex);

         } catch (PermissionDeniedException ex) {

             throw new OperationFailedException("unexpected", ex);

         }

         if (list.isEmpty()) {

             return null;

         }

         return list.get(0).getId();

     }

 }