public async Task <UserExamDTOEnvelope> Handle(Request request, CancellationToken cancellationToken)
{
var userId = this.currentUserAccessor.GetCurrentUserId();
var exam = context.Exams.Where(e => e.Id == request.ExamId && e.IsPublished == true).FirstOrDefault();
if (exam == null)
{
throw new Exceptions.ExamNotFoundException();
}
if (exam.IsPrivate && exam.UserId != userId)
{
throw new Exceptions.ExamNotFoundException();
}
var userExam = new Domain.UserExam();
userExam.ExamId = request.ExamId;
userExam.UserId = userId;
userExam.StartedtedAt = DateTime.UtcNow;
await this.context.UserExams.AddAsync(userExam, cancellationToken);
await context.SaveChangesAsync(cancellationToken);
context.Entry(userExam).Reload();
var userExamDto = mapper.Map <Domain.UserExam, UserExamDTO>(userExam);
return(new UserExamDTOEnvelope(userExamDto));
}
public async Task <UserExamDTOEnvelope> Handle(Request request, CancellationToken cancellationToken)
{
var userId = this.currentUserAccessor.GetCurrentUserId();
var userExam = await this.context.UserExams
.Include(e => e.Exam).Where(e => e.Id == request.Id && e.UserId == userId && e.Exam.IsPublished == true).FirstOrDefaultAsync();
if (userExam == null)
{
throw new Exceptions.UserExamNotFoundException();
}
if (userExam.Exam.IsPrivate && userExam.Exam.UserId != userId)
{
throw new Exceptions.PrivateUserExamEditException();
}
if (userExam.EndedAt.HasValue)
{
throw new Exceptions.UserExamAlreadyEndedException();
}
userExam.EndedAt = DateTime.UtcNow;
await context.SaveChangesAsync(cancellationToken);
context.Entry(userExam).Reload();
var userExamDto = mapper.Map <Domain.UserExam, UserExamDTO>(userExam);
return(new UserExamDTOEnvelope(userExamDto));
}
public async Task <UserExamResultDTOEnvelope> Handle(Request request, CancellationToken cancellationToken)
{
var userId = currentUserAccessor.GetCurrentUserId();
var userExam = await this.context.UserExams
.Include(e => e.Exam).Where(e => e.Id == request.UserExamId && e.UserId == userId && e.Exam.IsPublished == true).FirstOrDefaultAsync();
if (userExam == null)
{
throw new Exceptions.UserExamNotFoundException();
}
if (!userExam.EndedAt.HasValue)
{
await UserExam.UserExamHelper.EndUserExamIfTimeExpired(context, cancellationToken, userExam);
}
if (!userExam.EndedAt.HasValue)
{
throw new Exceptions.UserExamNotFoundException();
}
var userExamResult = await context.UserExamResults.FindAsync(userExam.Id);
if (userExamResult != null)
{
return(MakeEnvelope(userExamResult));
}
userExamResult = new Domain.UserExamResult()
{
UserExamId = userExam.Id
};
userExamResult.QuestionCount = context.Questions.Where(e => e.ExamId == userExam.ExamId).Count();
var userExamQuestionAnswers = context.UserExamQuestions.Where(e => e.UserExamId == userExam.Id)
.Include(e => e.UserExamQuestionAnswers).ToArray();
foreach (var userExamQuestionAnswer in userExamQuestionAnswers)
{
userExamQuestionAnswer.HasRightAnswer = IsRight(userExamQuestionAnswer);
}
userExamResult.AnsweredQuestionCount = userExamQuestionAnswers.Length;
userExamResult.NotAnsweredQuestionCount = userExamResult.QuestionCount - userExamResult.AnsweredQuestionCount;
userExamResult.RightAnswerCount = userExamQuestionAnswers.Where(e => e.HasRightAnswer == true).Count();
userExamResult.WrongAnswerCount = userExamQuestionAnswers.Where(e => e.HasRightAnswer == false).Count();
userExamResult.IsPassed = (float)userExamResult.RightAnswerCount / (float)userExamResult.QuestionCount * 100
>= userExam.Exam.PassPercentage;
await context.UserExamResults.AddAsync(userExamResult);
await context.SaveChangesAsync();
context.Entry(userExamResult).Reload();
return(MakeEnvelope(userExamResult));
}
public async Task <QuestionDTOEnvelope> Handle(Request request, CancellationToken cancellationToken)
{
var userId = currentUserAccessor.GetCurrentUserId();
var exam = context.Exams.NotPublishedByIdAndUserId(request.ExamId, userId).FirstOrDefault();
if (exam == null)
{
throw new Exceptions.ExamNotFoundException();
}
var question = mapper.Map <QuestionData, Domain.Question>(request.Question);
question.ExamId = exam.Id;
question.Exam = exam;
var utcNow = DateTime.UtcNow;
question.CreatedAt = utcNow;
question.UpdatedAt = utcNow;
question.AnswerOptions.ToList().ForEach(ao =>
{
ao.Question = question;
ao.CreatedAt = utcNow;
ao.UpdatedAt = utcNow;
});
await this.context.Questions.AddAsync(question);
await context.SaveChangesAsync();
context.Entry(question).Reload();
foreach (var answerOption in question.AnswerOptions)
{
context.Entry(answerOption).Reload();
}
var questionDto = mapper.Map <Domain.Question, QuestionDTO>(question);
return(new QuestionDTOEnvelope(questionDto));
}
public async Task <QuestionAnswerDTOEnvelope> Handle(Request request, CancellationToken cancellationToken)
{
var requestQA = request.UserExamQuestionAnswer;
var answerOptionIds = requestQA.AnswerOptionIds.ToArray();
var userId = this.currentUserAccessor.GetCurrentUserId();
var userExam = await this.context.UserExams.Include(e => e.Exam)
.Where(e => e.Id == requestQA.UserExamId && e.UserId == userId).FirstOrDefaultAsync();
if (userExam == null)
{
throw new UserExamNotFoundException();
}
if (userExam.EndedAt.HasValue)
{
throw new UserExamAlreadyEndedException();
}
if (await UserExam.UserExamHelper.EndUserExamIfTimeExpired(context, cancellationToken, userExam))
{
throw new UserExamAlreadyEndedException();
}
var question = await context.Questions.Where(e => e.Id == requestQA.QuestionId && e.ExamId == userExam.ExamId).FirstOrDefaultAsync();
if (question == null)
{
throw new QuestionNotFoundException();
}
if (question.QuestionTypeId == SeedData.QuestionTypes.Radio.Id && answerOptionIds.Count() > 1)
{
throw new AnswerToRadioQuestionFormatException();
}
//answer options validation
foreach (var answerOptionId in answerOptionIds)
{
var answerOption = await this.context.AnswerOptions.Include(e => e.Question).Where(e => e.Id == answerOptionId).FirstOrDefaultAsync(cancellationToken);
if (answerOption == null)
{
throw new AnswerOptionNotFoundException(answerOptionId);
}
;
if (answerOption.Question.ExamId != userExam.ExamId)
{
throw new InvalidAnswerOptionExamException(answerOptionId);
}
}
var userExamQuestion = await this.context.UserExamQuestions
.Where(e => e.QuestionId == requestQA.QuestionId &&
e.UserExamId == requestQA.UserExamId).Include(e => e.UserExamQuestionAnswers)
.FirstOrDefaultAsync(cancellationToken);
var isCreate = userExamQuestion == null;
var utcNow = DateTime.UtcNow;
userExamQuestion = userExamQuestion ?? new UserExamQuestion()
{
UserExamId = requestQA.UserExamId,
QuestionId = requestQA.QuestionId,
CreatedAt = utcNow,
UpdatedAt = utcNow
};
var isUnchanged = !isCreate && userExamQuestion.UserExamQuestionAnswers
.Select(e => e.AnswerOptionId).OrderBy(e => e).ToArray()
.SequenceEqual(answerOptionIds.OrderBy(e => e).ToArray());
if (isUnchanged)
{
return(MakeEnvelope(userExamQuestion));
}
if (isCreate)
{
var answers = answerOptionIds.Select(answerOptionId => new UserExamQuestionAnswr()
{
UserExamId = requestQA.UserExamId,
QuestionId = requestQA.QuestionId,
AnswerOptionId = answerOptionId,
CreatedAt = utcNow,
UpdatedAt = utcNow
}).ToList();
await this.context.UserExamQuestions.AddAsync(userExamQuestion);
await this.context.UserExamQuestionAnswers.AddRangeAsync(answers);
}
else
{
var answersToDelete = userExamQuestion.UserExamQuestionAnswers.Where(qa => !answerOptionIds.Any(id => id == qa.AnswerOptionId)).ToArray();
var answersToAdd = answerOptionIds.Where(id => !userExamQuestion.UserExamQuestionAnswers.Any(qa => qa.AnswerOptionId == id))
.Select(answerOptionId => new UserExamQuestionAnswr()
{
UserExamId = requestQA.UserExamId,
QuestionId = requestQA.QuestionId,
AnswerOptionId = answerOptionId,
CreatedAt = utcNow,
UpdatedAt = utcNow
});
userExamQuestion.UpdatedAt = utcNow;
this.context.UserExamQuestionAnswers.RemoveRange(answersToDelete);
await this.context.UserExamQuestionAnswers.AddRangeAsync(answersToAdd);
}
await context.SaveChangesAsync(cancellationToken);
context.Entry(userExamQuestion).Reload();
foreach (var questionAnswer in userExamQuestion.UserExamQuestionAnswers)
{
context.Entry(questionAnswer).Reload();
}
return(MakeEnvelope(userExamQuestion));
}