/// <summary>
/// Determines whether or not a Student can register for a course.
/// </summary>
/// <param name="student">The Student to register to the Course.</param>
/// <param name="course">The Course to register the Student for.</param>
/// <returns>True if the Student can register for the Course.</returns>
private bool CanRegisterForCourse(Student student, CourseSchedule courseSchedule)
{
bool successful = true;
TimeSpan startTime = courseSchedule.Schedule.StartTime;
TimeSpan endTime = ScheduleTime.GetEndTime(startTime, courseSchedule.Schedule.TimeBlocks);
if (courseSchedule.ProfessorId == student.PersonId)
{
successful = false;
}
else if (GetNumberOfStudentsInCourse(courseSchedule) >= courseSchedule.Capacity)
{
successful = false;
}
else
{
foreach (StudentSchedule existingSchedule in student.StudentSchedules.Where(s => s.Enrolled))
{
TimeSpan oldStartTime = existingSchedule.CourseSchedule.Schedule.StartTime;
TimeSpan oldEndTime = ScheduleTime.GetEndTime(oldStartTime, existingSchedule.CourseSchedule.Schedule.TimeBlocks);
if (ScheduleTime.TimesOverlap(startTime, endTime, oldStartTime, oldEndTime))
{
successful = false;
}
}
}
return(successful);
}
/// <summary>
/// Create a new StudentSchedule with the given Enrolled value.
/// </summary>
/// <param name="student"></param>
/// <param name="courseSchedule"></param>
/// <param name="enrolled"></param>
/// <returns></returns>
private bool CreateStudentSchedule(Student student, CourseSchedule courseSchedule, bool enrolled)
{
bool successful = CanRegisterForCourse(student, courseSchedule);
if (successful)
{
StudentSchedule existingSchedule = db.StudentSchedules.Where(s => s.StudentId == student.PersonId && s.CourseScheduleId == courseSchedule.CourseScheduleId).FirstOrDefault();
if (existingSchedule == null)
{
db.StudentSchedules.Add(new StudentSchedule
{
Student = student,
CourseSchedule = courseSchedule,
Enrolled = enrolled
});
}
else
{
existingSchedule.Enrolled = enrolled;
var entry = db.Entry(existingSchedule);
entry.State = EntityState.Modified;
}
successful = db.SaveChanges() > 0;
}
return(successful);
}
/// <summary>
/// Modify the capacity of a Course.
/// </summary>
/// <param name="capacity">The capacity of the course.</param>
/// <returns>True if the modifications were successful.</returns>
public bool ModifyCourse(CourseSchedule courseSchedule, short capacity)
{
courseSchedule.Capacity = capacity;
var entry = db.Entry(courseSchedule);
entry.State = System.Data.Entity.EntityState.Modified;
return(db.SaveChanges() > 0);
}
/// <summary>
/// Modify the time of a Course.
/// </summary>
/// <param name="startTime">The start time of the Course.</param>
/// <param name="timeBlocks">The number of time blocks the Course spans.</param>
/// <returns>True if the modifications were successful.</returns>
public bool ModifyCourse(CourseSchedule courseSchedule, Schedule schedule)
{
courseSchedule.Schedule = schedule;
var entry = db.Entry(courseSchedule);
entry.State = System.Data.Entity.EntityState.Modified;
return(db.SaveChanges() > 0);
}
/// <summary>
/// Gets a List of all Students enrolled to the Course.
/// </summary>
/// <param name="courseSchedule">The Course to get Students from.</param>
/// <returns>The List of Students.</returns>
public List <Student> ListEnrolledStudents(CourseSchedule courseSchedule)
{
List <Student> students = new List <Student>();
foreach (StudentSchedule studentSchedule in courseSchedule.StudentSchedules.Where(s => s.Enrolled))
{
students.Add(studentSchedule.Student);
}
return(students);
}
/// <summary>
/// Cancel a Course.
/// </summary>
/// <param name="courseSchedule">The Course to cancel.</param>
/// <returns>True if the cancellation was successful.</returns>
public bool CancelCourse(CourseSchedule courseSchedule)
{
db.CourseSchedules.Remove(courseSchedule);
return(db.SaveChanges() > 0);
}
/// <summary>
/// Gets the number of Students registered for a Course.
/// </summary>
/// <param name="courseSchedule">The CourseSchedule to check the number of Students on.</param>
/// <returns>The number of Students registered for the Course.</returns>
public int GetNumberOfStudentsInCourse(CourseSchedule courseSchedule)
{
return(courseSchedule.StudentSchedules.Where(s => s.Enrolled).ToList().Count);
}
/// <summary>
/// Hold a Course for a Student.
/// </summary>
/// <param name="student">The Student to hold the class for.</param>
/// <param name="courseSchedule">The Course to hold for the Student.</param>
/// <returns>True if the hold was successful.</returns>
public bool HoldCourse(Student student, CourseSchedule courseSchedule)
{
return(CreateStudentSchedule(student, courseSchedule, false));
}
/// <summary>
/// Register a Student to a Course.
/// </summary>
/// <param name="student">The Student to register to the Course.</param>
/// <param name="course">The Course to register the Student for.</param>
/// <returns>True if the registration was successful.</returns>
public bool RegisterForCourse(Student student, CourseSchedule courseSchedule)
{
return(CreateStudentSchedule(student, courseSchedule, true));
}