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

 import org.apache.commons.lang.StringUtils;

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

 import org.kuali.rice.krad.document.MaintenanceDocument;

 import org.kuali.rice.krad.maintenance.MaintainableImpl;

 import org.kuali.rice.krad.util.KRADConstants;

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

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

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

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

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

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

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

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

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

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

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

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

 import org.kuali.student.r2.core.type.dto.TypeInfo;

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

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

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

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

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

 import javax.xml.namespace.QName;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Map;

 import java.util.Random;

 public class CourseOfferingInfoMaintainableImpl extends MaintainableImpl {

     private static final long serialVersionUID = 1L;

     private static final String DEFAULT_DOCUMENT_DESC_FOR_CREATING_COURSE_OFFERING =

                                                             "Create a new course offering";

     private static final String DEFAULT_DOCUMENT_DESC_FOR_EDITING_COURSE_OFFERING =

                                                             "Edit an existing course offering";

     private static final String DEFAULT_DOCUMENT_DESC_FOR_COPYING_COURSE_OFFERING =

                                                             "Copy from an existing course offering to create a new one";

     private transient CourseService courseService;

     private transient CourseOfferingService courseOfferingService;

     // TODO - all exception handling in this method needs to 'manually' roll back what has been

     // changed in the database before the exception was caught

     @Override

     public void saveDataObject() {

         CourseOfferingInfo courseOfferingInfo = (CourseOfferingInfo) getDataObject();

 //        System.out.println(">>>>> in CourseOfferingInfoMaintainableImpl.saveDataObject method");

         //get termId from the user input through UI

         String termId = courseOfferingInfo.getTermId();

         //get courseId from courseOfferingInfo, which is retrieved based on course Code that the user input through UI

         String courseId = courseOfferingInfo.getCourseId();

         CourseInfo course = null;

         try {

             course = getCourseService().getCourse(courseId);

         } catch (org.kuali.student.common.exceptions.OperationFailedException ofe) {

             System.out.println("call getCourseService().getCourse(courseId), and get OperationFailedException:  " + ofe.toString());

         } catch (org.kuali.student.common.exceptions.DoesNotExistException dnee) {

             System.out.println("call getCourseService().getCourse(courseId), and get DoesNotExistException:  " + dnee.toString());

         } catch (org.kuali.student.common.exceptions.InvalidParameterException ipe) {

             System.out.println("call getCourseService().getCourse(courseId), and get InvalidParameterException:  " + ipe.toString());

         } catch (org.kuali.student.common.exceptions.PermissionDeniedException pde) {

             System.out.println("call getCourseService().getCourse(courseId), and get PermissionDeniedException:  " + pde.toString());

         } catch (org.kuali.student.common.exceptions.MissingParameterException mpe) {

             System.out.println("call getCourseService().getCourse(courseId), and get MissingParameterException:  " + mpe.toString());

         }

         // TODO - this entire method needs more complete exception handling; then remove this

         if (null == course) return;

         //form the formatIds

         List<String> formatIds = new ArrayList<String>();

         /*

                             List<FormatInfo> formatList = course.getFormats();

                             for (FormatInfo format : formatList){

                                 formatIds.add(format.getId());

                             }

             */

         FormatInfo firstFormat = null;

         // only pick the first format based on Larry's suggestion to simplify core slice development

         if (course != null) {

             firstFormat = course.getFormats().get(0);

             formatIds.add(firstFormat.getId());

         }

         CourseOfferingInfo coi = new CourseOfferingInfo ();

         coi.setTypeKey(LuiServiceConstants.COURSE_OFFERING_TYPE_KEY);

         coi.setStateKey(LuiServiceConstants.LUI_DRAFT_STATE_KEY);

         try {

             //create a CourseOfferingInfo coi

             coi = getCourseOfferingService().createCourseOffering(courseId, 

                     termId, 

                     coi.getTypeKey(), 

                     coi, 

                     new ContextInfo());

         } catch (Exception ex) {

           throw new RuntimeException (ex);

         }

         //If grading options not present in course, set a default one in CO

         if (coi.getGradingOptionKeys() == null || coi.getGradingOptionKeys().isEmpty()){

             List<String> gradingOptions = new ArrayList();

             gradingOptions.add(LrcServiceConstants.RESULT_SCALE_TYPE_KEY_GRADE);

             coi.setGradingOptionKeys(gradingOptions);

         }

         //create a list of instructors

         List<OfferingInstructorInfo> instructors = courseOfferingInfo.getInstructors();

         //set the list of instructors to the CourseOfferingInfo coi

         if (coi != null) {

             coi.setInstructors(instructors);

             coi.setStateKey(LuiServiceConstants.LUI_OFFERED_STATE_KEY);

             coi.setMaximumEnrollment(courseOfferingInfo.getMaximumEnrollment());

             coi.setExpenditure(null);

             //update the CourseOfferingInfo coi in DB with instructors info

             try {

                 getCourseOfferingService().updateCourseOffering(coi.getId(), coi, new ContextInfo());

             } catch (OperationFailedException ofe) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get OperationFailedException:  " + ofe.toString());

             } catch (InvalidParameterException ipe) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get InvalidParameterException:  " + ipe.toString());

             } catch (DoesNotExistException dnee) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get DoesNotExistException:  " + dnee.toString());

             } catch (PermissionDeniedException pde) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get PermissionDeniedException:  " + pde.toString());

             } catch (MissingParameterException mpe) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get MissingParameterException:  " + mpe.toString());

             } catch (VersionMismatchException vme) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get VersionMismatchException:  " + vme.toString());

             } catch (DataValidationErrorException dvee) {

                 System.out.println("call courseOfferingService.updateCourseOffering() method, and get DataValidationErrorException:  " + dvee.toString());

             }

         }

         //create a list of ActivityOfferingInfo based on activities defined in the format of the course

         List<String> courseOfferingIds = new ArrayList<String>();

         courseOfferingIds.add(coi.getId());

         List<ActivityOfferingInfo> activityOfferingInfoList = new ArrayList<ActivityOfferingInfo>();

         List<String> activityOfferingIds = new ArrayList<String>();

         if (firstFormat != null) {

             List<ActivityInfo> activities = firstFormat.getActivities();

             for (ActivityInfo activity : activities) {

                 ActivityOfferingInfo activityOfferingInfo = new ActivityOfferingInfo();

                 activityOfferingInfo.setInstructors(instructors);

                 //It looks like termId and activityId are required fields to create an ActivityOfferingInfo data entry

                 activityOfferingInfo.setTermId(termId);

                 activityOfferingInfo.setActivityId(activity.getId());

                 try {

                     List<TypeInfo> activityOfferingTypes = getCourseOfferingService().getActivityOfferingTypesForActivityType(activity.getActivityType(), new ContextInfo());

                     if (activityOfferingTypes.size() > 1) {

                         System.out.println(">>for core slice, it should be 1-to-1 mapping. so only take the first one -- " + activityOfferingTypes.get(0).getKey());

                     }

                     //for Core Slice -- if the mapping between Canonical Activity to Activity Offering is not 1-to-1,

                     //(see https://wiki.kuali.org/display/STUDENT/Learning+Unit+Instance+Types+and+States#LearningUnitInstanceTypesandStates-Types)

                     //only take the first one.

                     activityOfferingInfo.setTypeKey(activityOfferingTypes.get(0).getKey());

                     activityOfferingInfo.setStateKey(LuiServiceConstants.LUI_OFFERED_STATE_KEY);

                      //TODO remove this fake generation when we are getting real times from the form

                     // TODO: fix this to set the schedule id from the schedule service

                     String scheduleId = null;

                     activityOfferingInfo.setScheduleId(scheduleId);

 //                    activityOfferingInfo.setMeetingSchedules(generateFakeMeetingTimes());

                     activityOfferingInfo = getCourseOfferingService().createActivityOffering

                             (coi.getId (),

                             activityOfferingInfo.getTypeKey(),

                             activityOfferingInfo, 

                             new ContextInfo());

                     activityOfferingInfoList.add(activityOfferingInfo);

                     activityOfferingIds.add(activityOfferingInfo.getId());

                     //create a RegiistrationGroup after successfully create all activityOfferingInfos

                     RegistrationGroupInfo registrationGroupInfo = new RegistrationGroupInfo();

                     registrationGroupInfo.setCourseOfferingId(coi.getId());

                     registrationGroupInfo.setMaximumEnrollment(courseOfferingInfo.getMaximumEnrollment());

                     registrationGroupInfo.setActivityOfferingIds(activityOfferingIds);

                     registrationGroupInfo.setStateKey(LuiServiceConstants.LUI_OFFERED_STATE_KEY);

                     registrationGroupInfo.setTypeKey(LuiServiceConstants.REGISTRATION_GROUP_TYPE_KEY);

                     try {

                         getCourseOfferingService().createRegistrationGroup(coi.getId(), registrationGroupInfo, new ContextInfo());

                     } catch (OperationFailedException ofe) {

                         System.out.println("call courseOfferingService.createRegistrationGroup() method, and get OperationFailedException:  " + ofe.toString());

                     } catch (InvalidParameterException ipe) {

                         System.out.println("call courseOfferingService.createRegistrationGroup() method, and get InvalidParameterException:  " + ipe.toString());

                     } catch (DoesNotExistException dnee) {

                         System.out.println("call courseOfferingService.createRegistrationGroup() method, and get DoesNotExistException:  " + dnee.toString());

                     } catch (PermissionDeniedException pde) {

                         System.out.println("call courseOfferingService.createRegistrationGroup() method, and get PermissionDeniedException:  " + pde.toString());

                     } catch (MissingParameterException mpe) {

                         System.out.println("call courseOfferingService.createRegistrationGroup() method, and get MissingParameterException:  " + mpe.toString());

                     } catch (DataValidationErrorException dvee) {

                         System.out.println("call courseOfferingService.createRegistrationGroup() method, and get DataValidationErrorException:  " + dvee.toString());

                     }

                 } catch (OperationFailedException ofe) {

                     System.out.println("call courseOfferingService.getActivityOfferingTypesForActivityType() or createActivityOffering() method, and get OperationFailedException:  " + ofe.toString());

                 } catch (InvalidParameterException ipe) {

                     System.out.println("call courseOfferingService.getActivityOfferingTypesForActivityType() or createActivityOffering() method, and get InvalidParameterException:  " + ipe.toString());

                 } catch (PermissionDeniedException pde) {

                     System.out.println("call courseOfferingService.createActivityOffering() method, and get PermissionDeniedException:  " + pde.toString());

                 } catch (MissingParameterException mpe) {

                     System.out.println("call courseOfferingService.getActivityOfferingTypesForActivityType() or createActivityOffering() method, and get MissingParameterException:  " + mpe.toString());

                 } catch (DataValidationErrorException dvee) {

                     System.out.println("call courseOfferingService.createActivityOffering() method, and get DataValidationErrorException:  " + dvee.toString());

                 } catch (DoesNotExistException dnee) {

                     System.out.println("call courseOfferingService.getActivityOfferingTypesForActivityType() method, and get DoesNotExistException:  " + dnee.toString());

                 }

             }

         }

     }

     /**

      * @see org.kuali.rice.krad.maintenance.MaintainableImpl#prepareForSave()

      */

     @Override

     public void prepareForSave() {

         if (getMaintenanceAction().equalsIgnoreCase(KRADConstants.MAINTENANCE_NEW_ACTION)) {

 //          System.out.println(">>>>> in CourseOfferingInfoMaintainableImpl.prepareForSave method");

             //set state and type value for the courseOfferingInfo

             CourseOfferingInfo newCourseOffering = (CourseOfferingInfo) getDataObject();

             newCourseOffering.setTypeKey(LuiServiceConstants.COURSE_OFFERING_TYPE_KEY);

             newCourseOffering.setStateKey(LuiServiceConstants.LUI_OFFERED_STATE_KEY);

             //for each instructor, set personId to Id field, state, and type

             List<OfferingInstructorInfo> instructors =  newCourseOffering.getInstructors();

             for(OfferingInstructorInfo instructor: instructors){

                 instructor.setId(instructor.getPersonId());

                 instructor.setStateKey(LuiPersonRelationServiceConstants.ASSIGNED_STATE_KEY);

                 instructor.setTypeKey(LuiPersonRelationServiceConstants.INSTRUCTOR_MAIN_TYPE_KEY);

             }

         }

         super.prepareForSave();

     }

     /**

      * @see org.kuali.rice.krad.maintenance.Maintainable#processAfterCopy

      */

     @Override

     public void processAfterCopy(MaintenanceDocument document, Map<String, String[]> requestParameters) {

         //set documentDescription to document.documentHeader.documentDescription

         document.getDocumentHeader().setDocumentDescription(DEFAULT_DOCUMENT_DESC_FOR_COPYING_COURSE_OFFERING);

     }

     /**

      * @see org.kuali.rice.krad.maintenance.Maintainable#processAfterEdit

      */

     @Override

     public void processAfterEdit(MaintenanceDocument document, Map<String, String[]> requestParameters) {

         //set documentDescription to document.documentHeader.documentDescription

         document.getDocumentHeader().setDocumentDescription(DEFAULT_DOCUMENT_DESC_FOR_EDITING_COURSE_OFFERING);

     }

     /**

      * @see org.kuali.rice.krad.maintenance.Maintainable#processAfterNew

      */

     @Override

     public void processAfterNew(MaintenanceDocument document, Map<String, String[]> requestParameters) {

         //set documentDescription to document.documentHeader.documentDescription

         document.getDocumentHeader().setDocumentDescription(DEFAULT_DOCUMENT_DESC_FOR_CREATING_COURSE_OFFERING);

     }

     protected CourseService getCourseService() {

         if (courseService == null) {

             courseService = (CourseService) GlobalResourceLoader.getService(new QName(CourseServiceConstants.COURSE_NAMESPACE, "CourseService"));

         }

         return courseService;

     }

     protected CourseOfferingService getCourseOfferingService() {

         if (courseOfferingService == null) {

             courseOfferingService = (CourseOfferingService) GlobalResourceLoader.getService(new QName(CourseOfferingServiceConstants.NAMESPACE, "CourseOfferingService"));

         }

         return courseOfferingService;

     }

     //TODO remove this fake generation below when we are getting real times from the form

     private static final String[] days = {"MO", "TU", "WE", "TH", "FR"};

     private static final String[] hours = {"07", "08", "09", "10", "11", "12", "13", "14", "15", "16", "17"};

     private static final String[] mins = {"00", "15", "30", "45"};

     private List<MeetingScheduleInfo> generateFakeMeetingTimes() {

         List<MeetingScheduleInfo> infos = new ArrayList<MeetingScheduleInfo>();

         Random generator = new Random();

         int randomNum = generator.nextInt(2);

         String daysString = "";

         String daysString2 = "";

         if (randomNum == 0) {

             int day1Index = generator.nextInt(4);

             daysString = days[day1Index];

             daysString2 = days[day1Index + 1];

         } else {

             int day1Index = generator.nextInt(2);

             int day2Index = generator.nextInt(3) + 2;

             daysString = days[day1Index] + "," + days[day2Index];

         }

         String time = daysString + ";" + generateHours();

         MeetingScheduleInfo m1 = new MeetingScheduleInfo();

         m1.setScheduleId(time);

         infos.add(m1);

         if (StringUtils.isNotBlank(daysString2)) {

             String time2 = daysString2 + ";" + generateHours();

             MeetingScheduleInfo m2 = new MeetingScheduleInfo();

             m2.setScheduleId(time2);

             infos.add(m2);

         }

         return infos;

     }

     private String generateHours() {

         Random generator = new Random();

         int randomNum = generator.nextInt(2);

         int hourIndex1 = generator.nextInt(10);

         String hour1 = hours[hourIndex1];

         String hour2 = hours[hourIndex1 + 1];

         int minIndex1 = generator.nextInt(3);

         String min1 = mins[minIndex1];

         String min2 = mins[minIndex1 + randomNum];

         return hour1 + min1 + "," + hour2 + min2;

     }

 }