/// <summary>
/// Removes a student from a class
/// </summary>
/// <param name="classId">The id of the class to remove the student from</param>
/// <param name="studentId">The id of the student to unenroll</param>
/// <returns>The deleted enrollment</returns>
public Enrollment UnEnrollStudent(int classId, int studentId)
{
var enrollment = _db.Enrollments
.Include(e => e.Class)
.FirstOrDefault(e => e.Class.Id == classId && e.Student.Id == studentId);
if (enrollment == null)
{
throw new InvalidOperationException("Error unenrolling student");
}
// Delete the Person object from the PersonGroup
var faceClient = RecognitionService.GetFaceClient();
Task.Run(() => faceClient.DeletePersonAsync(classId.ToString(), enrollment.PersonId));
// Remove all attendance and enrollment information
var attendance = _db.Attendance.Where(a => a.Student.Id == studentId);
_db.Attendance.RemoveRange(attendance);
enrollment.Class.TrainingStatus = TrainingStatus.UnTrained;
// Update training status for class
_db.Enrollments.Remove(enrollment);
_db.SaveChanges();
return(enrollment);
}
/// <summary>
/// Deletes a class with the given id and all other related information
/// </summary>
/// <param name="classId">Id of the class to delete</param>
public Class DeleteClass(int classId)
{
var @class = _db.Classes.Find(classId);
if (@class == null)
{
throw new InvalidOperationException("Error deleting class.");
}
// Delete all lectures
var lectureManager = new LectureManager(_db);
var lectures = new List <Lecture>(@class.Lectures);
foreach (var lecture in lectures)
{
lectureManager.Delete(lecture.Id);
}
// Delete all enrollments
_db.Enrollments.RemoveRange(@class.Enrollment);
// Delete cognitive data
var faceClient = RecognitionService.GetFaceClient();
Task.Run(() => faceClient.DeletePersonGroupAsync(@class.Id.ToString())).Wait();
_db.Classes.Remove(@class);
_db.SaveChanges();
return(@class);
}
/// <summary>
/// Enrolls a student into a class
/// </summary>
/// <param name="classId">The id of the class to enroll the student into</param>
/// <param name="studentId">The id of the student to enroll</param>
/// <returns>The enrollment created</returns>
public Enrollment EnrollStudent(int classId, int studentId)
{
var existing = _db.Enrollments
.FirstOrDefault(e => e.Class.Id == classId && e.Student.Id == studentId);
var @class = _db.Classes.Find(classId);
var student = _db.Students.Find(studentId);
// Already enrolled
if (existing != null)
{
throw new InvalidOperationException("Error enrolling student");
}
var enrollment = new Enrollment
{
Class = @class,
EnrollDate = DateTime.Now,
Student = student
};
_db.Enrollments.Add(enrollment);
// Add the faces
if (!student.Profile.Images.Any())
{
throw new InvalidOperationException("Profile must be added before enrollment.");
}
// Create the Person for this student
var faceClient = RecognitionService.GetFaceClient();
var person = Task.Run(() => faceClient.CreatePersonAsync(classId.ToString(), student.FirstName)).Result;
foreach (var image in student.Profile.Images)
{
Task.Run(() => faceClient.AddPersonFaceAsync(@class.Id.ToString(), person.PersonId, image.Url)).Wait();
}
// Update training status for class
enrollment.PersonId = person.PersonId;
enrollment.Class.TrainingStatus = TrainingStatus.UnTrained;
_db.SaveChanges();
return(enrollment);
}
/// <summary>
/// Creates a new class
/// </summary>
/// <param name="name">The name/title of the class</param>
/// <param name="number">The course number</param>
/// <param name="section">The section</param>
/// <param name="semester">The semester e.g. Fall 2016</param>
/// <param name="teacher">The teacher for this class</param>
/// <returns>The created class</returns>
/// <remarks>Throws InvalidOperationException if class already exists with the given details</remarks>
public Class CreateClass(string name, int number, string section, Semester semester, int year, int teacherId)
{
var existing = _db.Classes
.Count(c => c.Name == name &&
c.Number == number &&
c.Section == section &&
c.Semester == semester &&
c.Teacher.Id == teacherId);
var teacher = _db.Teachers.Find(teacherId);
if (existing > 0 || teacher == null)
{
throw new InvalidOperationException("Error creating class");
}
var newClass = new Class
{
Name = name,
Number = number,
Section = section,
Semester = semester,
Year = year,
TrainingStatus = TrainingStatus.UnTrained,
Teacher = teacher
};
var added = _db.Classes.Add(newClass);
_db.SaveChanges();
// Create the PersonGroup for this class
var faceClient = RecognitionService.GetFaceClient();
Task.Run(() => faceClient.CreatePersonGroupAsync(added.Id.ToString(), added.Name)).Wait();
return(added);
}