// Get multiple choice question for the currently selected units based on question selection algorithm.
public Question GetMultipleChoiceQuestionBasedOnRating(string userName)
{
// Get the currently selected units.
var units = _commonHelper.GetSelectedUnitsList(userName).Select(u => u.SelectedUnitId);
// Find new question.
var question = _questionRepository.GetAllQuestions().Where(q => !_questionRatingRepository.GetAllRatings().Where(r => r.UserName == userName).Select(r => r.QuestionId).Contains(q.Id) && units.Contains(q.UnitId)).FirstOrDefault();
// If no new questions found look for question on different criteria.
if (question is null)
{
// Find lowest rated question id.
var nextQuestionId = _questionRatingRepository.GetAllRatings().Where(r => r.UserName == userName && units.Contains(r.Question.UnitId) && r.Time < DateTime.Now.AddHours(-1) && r.Rating < 6).OrderBy(r => r.Time).FirstOrDefault();
// If no low rated questions due to be shown look for oldest question id.
if (nextQuestionId is null)
{
// Get oldest rated question id.
nextQuestionId = _questionRatingRepository.GetAllRatings().Where(r => r.UserName == userName && units.Contains(r.Question.UnitId)).OrderBy(r => r.Time).FirstOrDefault();
}
if (nextQuestionId != null)
{
// Get the question from the selected id.
question = _questionRepository.GetQuestionById(nextQuestionId.QuestionId);
}
}
return(question);
}
// Get list of all questions for the selected units.
public List <Question> GetAllQuestions(string userName)
{
// Get user selected units.
var units = _commonHelper.GetSelectedUnitsList(userName).Select(u => u.SelectedUnitId);
// Get all questions where the unit has been selected.
var questions = _questionRepository.GetAllQuestions()
.Join(_unitRepository.GetAllUnits().Where(u => units.Contains(u.Id)), q => q.UnitId, u => u.Id,
(q, u) => new Question
{
Answer1 = q.Answer1,
Answer2 = q.Answer2,
Answer3 = q.Answer3,
Answer4 = q.Answer4,
Content = q.Content,
CorrectAnswer = q.CorrectAnswer,
Id = q.Id,
Reference = q.Reference,
UnitId = q.UnitId,
Unit = u
}).OrderBy(q => q.Id).ToList();
return(questions);
}