/// <summary>
/// Answers specified quiz question.
/// </summary>
/// <param name="question">The question to answer.</param>
/// <param name="answerTemplateId">The answer template identifier.</param>
public void AnswerQuestion(Question question, int answerTemplateId)
{
ThrowIf.Null(question, nameof(question));
ThrowIf.Completed(question.Quiz);
if (question.IsAnswered)
{
throw new QuizFlowException(
QuizFlowErrorCodes.QuestionAlreadyAnswered,
"Question already answered.");
}
QuestionTemplate questionTemplate = this.Uow.QuestionTemplateRepository
.GetByID(question.TemplateId);
ThrowIf.NotFound(questionTemplate, question.TemplateId);
AnswerTemplate answerTemplate = questionTemplate.GetAnswer(answerTemplateId);
ThrowIf.NotFound(answerTemplate, answerTemplateId);
var answer = new Answer()
{
TemplateId = answerTemplateId,
IsCorrect = answerTemplate.IsCorrect
};
question.Answers.Add(answer);
question.DateEnd = DateTime.Now;
this.Uow.Save();
}
/// <summary>
/// Completes the quiz.
/// </summary>
/// <param name="quiz">The quiz to complete.</param>
public void CompleteQuiz(Quiz quiz)
{
ThrowIf.Null(quiz, nameof(quiz));
ThrowIf.Completed(quiz);
IScoreCalculationStrategy scoreCalculation = this.ScoreCalculationFactory.CreateStrategy(quiz);
var score = scoreCalculation.CalculateScore(quiz);
this.Uow.ScoreRepository.Insert(score);
quiz.DateEnd = DateTime.Now;
this.Uow.Save();
}
/// <summary>
/// Gets next question of the specified quiz.
/// </summary>
/// <param name="quizId">The quiz to get question from.</param>
/// <returns>Quiz flow command to manage quiz flow.</returns>
public QuizFlowCommandContract GetNextQuestion(Quiz quiz)
{
ThrowIf.Null(quiz, nameof(quiz));
ThrowIf.Completed(quiz);
Question currentQuestion = quiz.CurrentQuestion;
QuizFlowCommandContract command;
if (currentQuestion != null && !currentQuestion.IsAnswered)
{
command = this.GetCommandFromCurrentQuestion(quiz, currentQuestion);
}
else
{
command = this.CreateCommandFromNextQuestion(quiz, currentQuestion);
}
this.Uow.Save();
command.HideAnswerCorrectness();
return(command);
}
