/// <summary>
/// Returns next question
/// </summary>
/// <param name="testData">Test session info</param>
/// <returns></returns>
private Question GetQuestion(TestData testData)
{
int[] priorityArray = GetDifficultyPriorityArray(testData.TrueDifficultyLevel);
int i = 0;
int nextQuestionId = -1;
while (nextQuestionId == -1 && i < 10)
{
nextQuestionId = testData.QuestionBank.GetQuestion(priorityArray[i]);
if (++i >= 10)
{
throw new Exception("Нет подходящих вопросов");
}
}
return(QuestionController.GetById(nextQuestionId));
}
public ActionResult Process(FormCollection collection)
{
// Geting session information
int sessionId = 0;
TestData testData = GetTestData(out sessionId);
// If test data is bad ending survey
if (testData == null)
{
return(RedirectToAction("End"));
}
// If bad question token (for example student are trying to answer question previously cached in browser) redirecting to Index (will show last generated question)
if (collection["QuestionToken"] != testData.GetQuestionHash())
{
return(RedirectToAction("Index"));
}
// Get previous question to check asnwer is correct
GeneratedQuestion question =
TemplateManager.Generate(testData.CurrentQuestionId,
testData.TestSeed);
// Remembering some nessasary data
testData.ItemsTaken++;
testData.TotalDifficultiesUsed += testData.CurrentQuestionDifficulty;
// Calculating the amount that will change the difficulty
double difficultyShift = 0.2 + (float)2 / testData.ItemsTaken;
// Checking answer is correct
bool answerIsCorrect = CheckAnswerIsCorrect(question, collection["Answers"]);
// Saving to question information about its own statistic
QuestionController.AddAttempt(testData.CurrentQuestionId, answerIsCorrect);
// Adding data to 'ResultGraph'
testData.AddPointToResultGraph(answerIsCorrect);
// TODO: Temperory method for statistics. (Re)move
testData.AddPointToRDF();
// Correcting difficulty
if (answerIsCorrect)
{
testData.TrueDifficultyLevel += difficultyShift;
if (testData.TrueDifficultyLevel > 10)
{
testData.TrueDifficultyLevel = 10;
}
testData.RightAnswersCount++;
}
else
{
testData.TrueDifficultyLevel -= difficultyShift;
if (testData.TrueDifficultyLevel < 1)
{
testData.TrueDifficultyLevel = 1;
}
}
// TODO: Make CONST optional. For the next programmers' generation
// Checking if measurement error lower than CONST
var error = testData.CalculateError();
var measure = testData.CalculateMeasure();
if (error <= 0.5)
{
testData.TestCompleted = true;
}
if (measure + error <= 1 || measure - error >= 10)
{
testData.TestCompleted = true;
}
//Check for test min length
// TODO: Add some behaviors. For the next programmers' generation. For example different options for different test types.
// If amount of taken question equals amount of total questions in test, mark test as completed.
if (testData.ItemsTaken >= testData.MaxAmountOfQuestions)
{
testData.TestCompleted = true;
}
// TODO: Add min length to test data
else if (testData.ItemsTaken < 10)
{
testData.TestCompleted = false;
}
// Selecting next question
Question selectedQuestion = GetQuestion(testData);
// Generates random seed, which helps to generate the same question from tamplate, if needed
testData.TestSeed = TemplateManager.GetRandomSeed();
// Remembering next question parameters
testData.CurrentQuestionDifficulty = selectedQuestion.Difficulty;
testData.CurrentQuestionId = selectedQuestion.ID;
// Saving test session
SetTestData(testData, sessionId);
// Continue test or end it depending on TestCompleted flag
return((testData.TestCompleted) ? RedirectToAction("End") : RedirectToAction("Index"));
}