/// <summary>
/// Saves test data
/// </summary>
/// <param name="data">Session data</param>
/// <param name="sessionId">Session id (needed if data stores in database)</param>
/// <param name="saveToCookie">'True' to make data stored in cookie</param>
private void SetTestData(TestData data, int sessionId = 0, bool saveToCookie = false)
{
string dataString = XmlManager.SerializeObjectUTF8(data);
string tokenString;
string testInfoString;
if (saveToCookie)
{
testInfoString = HttpUtility.UrlEncode(dataString);
tokenString = MD5HashManager.GenerateKey(testInfoString);
}
else
{
tokenString = MD5HashManager.GenerateKey(dataString);
testInfoString = TestSessionManager.Write(dataString, sessionId).ToString(CultureInfo.InvariantCulture);
}
var testInfo = new HttpCookie("TestInfo", testInfoString);
var securityToken = new HttpCookie("SecurityToken", tokenString);
Response.Cookies.Add(testInfo);
Response.Cookies.Add(securityToken);
TempData["testInfo"] = testInfo;
TempData["securityToken"] = securityToken;
}
/// <summary>
/// Initialize test
/// </summary>
/// <param name="subjectIds">Subject ids in which questions taking</param>
/// <param name="testType">Test type</param>
/// <param name="sourceType">See TestSourceTypes class</param>
/// <param name="source">Nullable id of source</param>
/// <returns></returns>
private ActionResult StartTest(IEnumerable<int> subjectIds, TestType testType, int sourceType, int? source)
{
if (subjectIds == null || !subjectIds.Any()) return RedirectToAction("Index", "Home");
var questionBank = new QuestionBank();
var questions =
_db.Questions.Where(
x => subjectIds.Contains(x.SubjectID) && x.IsPublished && x.Answers.Any());
if (!questions.Any()) return RedirectToAction("Error", new {message = "Для теста не найдено ни одного вопроса. Обратитесь к администратору."});
for (int i = 1; i <= 10; i++)
{
questionBank.Questions.Add(new List<int>(questions.Where(x => x.Difficulty == i).Select(x => x.ID)));
}
var testData = new TestData
{
TestCompleted = false,
TrueDifficultyLevel = 5,
SubjectsIds = subjectIds.ToList(),
QuestionBank = questionBank,
Started = TimeManager.GetCurrentTime(),
TestType = testType,
MaxAmountOfQuestions = _db.Questions.Count(x => subjectIds.Contains(x.SubjectID) && x.IsPublished),
SourceType = sourceType,
Source = source,
};
Question selectedQuestion = GetQuestion(testData);
testData.TestSeed = TemplateManager.GetRandomSeed();
testData.CurrentQuestionDifficulty = selectedQuestion.Difficulty;
testData.CurrentQuestionId = selectedQuestion.ID;
SetTestData(testData);
return RedirectToAction("Index");
}
/// <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);
}
