public static ShoppingCart GetActiveShoppingCart(int studentId)
{
Student student = StudentRepository.GetInstance().Get(studentId);
if (student.ActiveShoppingCart == null)
{
student.ActiveShoppingCart = ShoppingCartRepository.GetInstance().GetNew(studentId);
}
return(student.ActiveShoppingCart);
}
public static void RemoveCourse(int cartId, int courseId)
{
Course course = CourseRepository.GetInstance().Get(courseId);
ShoppingCart cart = ShoppingCartRepository.GetInstance().Get(cartId);
if (!cart.Courses.Contains(course))
{
throw new Exception($"Course {courseId} can't be removed from cart {cartId}");
}
cart.Courses.Remove(course);
}
public static void AddCourse(int cartId, int courseId)
{
Course course = CourseRepository.GetInstance().Get(courseId);
ShoppingCart cart = ShoppingCartRepository.GetInstance().Get(cartId);
if (cart.Courses.Contains(course))
{
throw new Exception($"Course {courseId} is a duplicate in cart {cartId}");
}
cart.Courses.Add(course);
}
public static RegistrationResult Register(int cartId)
{
RegistrationResult result = new RegistrationResult();
ShoppingCart cart = ShoppingCartRepository.GetInstance().Get(cartId);
Student student = cart.Student;
foreach (Course course in cart.Courses)
{
if (course.EnrolledStudents.Contains(student))
{
result.Success = false;
result.Errors.Add($"Student {cart.Student.Id} already enrolled in course {course.Name}");
}
}
if (result.Success)
{
foreach (Course course in cart.Courses)
{
course.EnrolledStudents.Add(cart.Student);
}
}
return(result);
}