/// <summary>
/// Fetches all student grades within an assignment group
/// </summary>
/// <param name="ssn"></param>
/// <param name="assignmentGroupID"></param>
/// <returns></returns>
public StudentGradeDTO GetStudentGradesInGroup(string ssn, int assignmentGroupID)
{
// Fetching the student
StudentDTO student = _persons.GetStudentBySSN(ssn).GetStudentDTO();
// Fetching the course
//CourseInstance course = _courseInstances.GetCourseInstanceByID(courseInstanceID);
// Fetching the assignment group
AssignmentGroupDTO assignmentGroup = _assignmentGroups.GetAssignmentGroupByID(assignmentGroupID).GetAssignmentGroupDTO();
// Fetching the assignments in the group
List <AssignmentDTO> assignments = _assignments.GetGroupAssignments(assignmentGroupID);
List <GradeDTO> gradesDTO = (from a in assignments
join g in _grades.All().ToList()
on a.ID equals g.AssignmentID
where student.SSN == g.StudentSSN
select new GradeDTO
{
AssignmentID = g.AssignmentID,
GradeValue = g.GradeValue,
StudentID = student.ID,
AssignmentName = a.Name,
StudentSSN = ssn
}).ToList();
return(new StudentGradeDTO
{
Student = student,
StudentGrades = gradesDTO
});
}
public void CalculateEarnedGroupPercentage()
{
// Arrange:
AssignmentGroupDTO group = new AssignmentGroupDTO
{
Name = "Hat Hut",
CourseInstanceID = 1,
Weight = 30,
GradedAssignments = 2
};
List <GradeDTO> gradeList = new List <GradeDTO>();
gradeList.Add(new GradeDTO
{
GradeValue = 10
});
gradeList.Add(new GradeDTO
{
GradeValue = 0
});
// Act:
double groupGrade = _service.CalculateEarnedGroupPercentage(group, gradeList);
// Assert:
Assert.AreEqual(30 / 2.0 * 0.1, groupGrade);
}
/// <summary>
/// Fetches a single assignment group by ID
/// </summary>
/// <param name="assignmentGroupID"></param>
/// <returns></returns>
public AssignmentGroupDTO GetAssignmentGroup(int assignmentGroupID)
{
AssignmentGroup result = _assignmentGroups.GetAssignmentGroupByID(assignmentGroupID);
AssignmentGroupDTO transObject = result.GetAssignmentGroupDTO();
transObject.Assignments = GetAssignmentsInGroup(assignmentGroupID);
return(transObject);
}
public void GetAssignmentGroup()
{
// Arrange:
int courseInstanceID = 1;
// Act:
AssignmentGroupDTO group = _service.GetAssignmentGroup(courseInstanceID);
// Assert:
Assert.AreEqual("Generic Group 1", group.Name);
}
/// <summary>
/// Calculates the grade earned in a given group relative to 100%
/// </summary>
public double CalculateEarnedGroupPercentage(AssignmentGroupDTO group, List <GradeDTO> earnedGrades)
{
// Sorting the grades
List <GradeDTO> sortedGrades = earnedGrades.OrderByDescending(o => o.GradeValue).ToList();
double gradeValues = 0;
// Checking the number of graded assignments
int graded = (sortedGrades.Count > group.GradedAssignments) ? group.GradedAssignments : sortedGrades.Count;
// Going through each group
for (int index = 0; index < graded; index++)
{
gradeValues += (group.Weight * 0.01 / graded) * sortedGrades[index].GradeValue;
}
return(gradeValues);
}
public void AddAssignmentGroup()
{
// Arrange:
AddAssignmentGroupViewModel groupModel = new AddAssignmentGroupViewModel
{
GradedAssignments = 5,
Name = "Another generic group",
Weight = 10
};
int courseInstanceID = 1;
// Act:
AssignmentGroupDTO newGroup = _service.AddAssignmentGroup(courseInstanceID, groupModel);
// Assert:
Assert.AreEqual(groupModel.Name, newGroup.Name);
Assert.AreEqual(groupModel.GradedAssignments, newGroup.GradedAssignments);
Assert.AreEqual(groupModel.Weight, newGroup.Weight);
}
/// <summary>
/// Adds an assignment group to a course instance
/// </summary>
/// <param name="courseInstanceID"></param>
/// <param name="groupData"></param>
/// <returns></returns>
public AssignmentGroupDTO AddAssignmentGroup(int courseInstanceID, AddAssignmentGroupViewModel groupData)
{
groupData.ValidateAssignmentGroupVM();
// Fetching the course (throws an error if not found)
CourseInstance course = _courseInstances.GetCourseInstanceByID(courseInstanceID);
// Fetching the assignments in the group
List <AssignmentGroupDTO> courseAssignmentGroups = GetAssignmentGroups(courseInstanceID);
// Adding the new group's weight to the list
double totalWeight = courseAssignmentGroups.CalculateAssignmentGroupWeight() + groupData.Weight;
// Illegal if new group weight goes above the maximum
if (totalWeight > 100)
{
throw new CoursesAPIException(ErrorCodes.ILLEGAL_ASSIGNMENT_GROUP_WEIGHT);
}
// New group to add
AssignmentGroup newGroup = new AssignmentGroup
{
CourseInstanceID = courseInstanceID,
Name = groupData.Name,
GradedAssignments = groupData.GradedAssignments,
Weight = groupData.Weight
};
_assignmentGroups.Add(newGroup);
_uow.Save();
AssignmentGroupDTO groupDTO = newGroup.GetAssignmentGroupDTO();
return(groupDTO);
}
