private int[] GetTheNumberOfQuestionsPerSection(ViewModels.TestDefinitionDetail test)
{
int[] noOfQuestionsInASection = new int[test.Sections.Count()];
for (int i = 0; i < test.Sections.Count(); i++)
{
noOfQuestionsInASection[i] = questionRepository.GetQuestionIDsBySctions(new Guid[] { test.Sections[i].SectionID }).ToArray().Count();
}
int[] result = new int[test.Sections.Count()];
int noOfQuestionsToDistribute = test.NumberOfQuestions;
while (noOfQuestionsToDistribute > 0)
{
bool resultUpdated = false;
for (int i = 0; i < result.Length && noOfQuestionsToDistribute > 0; i++)
{
if (noOfQuestionsInASection[i] > 0)
{
result[i]++;
noOfQuestionsInASection[i]--;
resultUpdated = true;
noOfQuestionsToDistribute--;
}
}
if (!resultUpdated)
{
break;
}
}
return(result);
}
public IHttpActionResult EndExam(ViewModels.ExamDetail exam)
{
ViewModels.ExamDetail existingExam = examRepository.GetExamByID(exam.ID);
if (existingExam == null)
{
return(StatusCode(HttpStatusCode.NotFound));
}
if (existingExam.EndDate < DateTime.Now || existingExam.IsEnded)
{
return(StatusCode(HttpStatusCode.NotAcceptable));
}
if (existingExam.Answers.Length != exam.Answers.Length || !existingExam.Answers.All(ea => exam.Answers.Any(a => a.QuestionID == ea.QuestionID)))
{
return(StatusCode(HttpStatusCode.NotAcceptable));
}
examService.EvaluateAnswers(existingExam, exam);
existingExam.EndDate = DateTime.Now;
examRepository.UpdateExam(existingExam);
ViewModels.TestDefinitionDetail test = testRepository.GetTestByID(exam.TestID);
return(Ok(test.ShowScoreWhenCompleted ? existingExam.TotalScore.ToString() : string.Empty));
}
private Guid[] GetRandomQuestionsBySection(ViewModels.TestDefinitionDetail test, int[] noOfQuestionsPerSection)
{
List <Guid> result = new List <Guid>();
Random rnd = new Random();
for (int i = 0; i < noOfQuestionsPerSection.Length; i++)
{
Guid[] questionsOfASection = questionRepository.GetQuestionIDsBySctions(new Guid[] { test.Sections[i].SectionID }).ToArray();
result.AddRange(questionsOfASection.OrderBy(q => rnd.Next()).Take(noOfQuestionsPerSection[i]).ToList());
}
return(result.ToArray());
}
public IHttpActionResult Get(Guid id)
{
ViewModels.TestDefinitionDetail test = testRepository.GetTestByID(id);
if (test.IsPublished || Authorizer.IsAdmin(HttpContext.Current.User.Identity.Name))
{
return(Ok(test));
}
else
{
return(StatusCode(System.Net.HttpStatusCode.Unauthorized));
}
}
public ViewModels.TestDefinitionDetail GetTestByID(Guid id)
{
ViewModels.TestDefinitionDetail test = repository.GetByID <TestDefinition>(id).DeepCopyTo <ViewModels.TestDefinitionDetail>();
if (test.QuestionsSelectedRandomly)
{
test.Sections = repository.All <TestSection>().Where(c => c.TestID == id).ToArray();
}
else
{
test.Questions = repository.All <TestQuestion>().Where(c => c.TestID == id).ToArray();
}
return(test);
}
public void UpdateTest(ViewModels.TestDefinitionDetail test)
{
repository.Upsert(test.DeepCopyTo <TestDefinition>());
TestSection[] existingSections = repository.All <TestSection>().Where(o => o.TestID == test.ID).ToArray();
TestQuestion[] existingQuestions = repository.All <TestQuestion>().Where(o => o.TestID == test.ID).ToArray();
if (test.QuestionsSelectedRandomly)
{
foreach (TestSection sectionToUpdate in test.Sections)
{
TestSection existingItem = existingSections.FirstOrDefault(s => s.SectionID == sectionToUpdate.SectionID);
if (existingItem == null)
{
sectionToUpdate.ID = Guid.NewGuid();
sectionToUpdate.TestID = test.ID;
repository.Upsert(sectionToUpdate);
}
}
}
else
{
foreach (TestQuestion questionToupdate in test.Questions)
{
TestQuestion existingItem = existingQuestions.FirstOrDefault(s => s.QuestionID == questionToupdate.QuestionID);
if (existingItem == null)
{
questionToupdate.ID = Guid.NewGuid();
questionToupdate.TestID = test.ID;
repository.Upsert(questionToupdate);
}
}
}
foreach (TestSection item in existingSections.Where(eq => test.Sections == null || !test.Sections.Any(q => q.SectionID == eq.SectionID)))
{
repository.Delete(item);
}
foreach (TestQuestion item in existingQuestions.Where(eq => test.Questions == null || !test.Questions.Any(q => q.QuestionID == eq.QuestionID)))
{
repository.Delete(item);
}
repository.SaveChanges();
}
public IHttpActionResult TakeExam(Exam exam)
{
if (!Authorizer.IsAdmin(HttpContext.Current.User.Identity.Name) && string.IsNullOrWhiteSpace(exam.CandidateName))
{
return(StatusCode(HttpStatusCode.Unauthorized));
}
exam.CandidateName = exam.CandidateName ?? HttpContext.Current.User.Identity.Name;
ViewModels.TestDefinitionDetail test = testRepository.GetTestByID(exam.TestID);
if (!test.IsPublished)
{
return(StatusCode(HttpStatusCode.Unauthorized));
}
ViewModels.ExamDetail examCreated = examService.CreateExam(test, exam.CandidateName);
examRepository.UpdateExam(examCreated);
return(Ok(new { CandidateName = examCreated.CandidateName, TestID = examCreated.TestID, ID = examCreated.ID, Answers = examCreated.Answers.Select(a => new { QuestionID = a.QuestionID }) }));
}
public ViewModels.ExamDetail CreateExam(ViewModels.TestDefinitionDetail test, string candidateName)
{
Random rnd = new Random();
Guid[] questionsSelected;
if (test.QuestionsSelectedRandomly)
{
int[] noOfQuestionsPerSection = GetTheNumberOfQuestionsPerSection(test);
questionsSelected = GetRandomQuestionsBySection(test, noOfQuestionsPerSection);
}
else
{
questionsSelected = test.Questions.Select(q => q.QuestionID).ToArray();
}
ViewModels.ExamDetail exam = new ViewModels.ExamDetail
{
ID = Guid.NewGuid(),
AllQuestions = test.NumberOfQuestions,
StartDate = DateTime.Now.AddSeconds(5),
EndDate = DateTime.Now.AddSeconds(5).AddMinutes(test.MinutesAllowed),
CandidateName = candidateName,
TestID = test.ID,
IsEnded = false
};
exam.Answers = questionsSelected.OrderBy(q => rnd.Next()).Select(q => new ExamAnswer
{
ID = Guid.NewGuid(),
ExamID = exam.ID,
QuestionID = q
}).ToArray();
exam.AllQuestions = exam.Answers.Length;
return(exam);
}
public IHttpActionResult Post(ViewModels.TestDefinitionDetail test)
{
testRepository.UpdateTest(test);
return(Ok());
}