public Question GetNextQuestion(HomeworkState state,int userId)
{
List<int> solvedQuestionIdList = GetSolvedQuestionIdList(state.SubjectId,userId);
List<Question> questionList = _questionDb.GetQuestionListBySubjectId(state.SubjectId);
List<Question> unSolvedQuestionList = questionList.Where(question => !solvedQuestionIdList.Contains(question.id)).ToList() ;
if(!unSolvedQuestionList.Any())
{
throw new UnSolvedQuestionNotFoundException();
}
return unSolvedQuestionList.First();
}
// TODO: copy contructor in c#? huh?
public HomeworkState(HomeworkState state)
{
IndexOfBaseSubject = state.IndexOfBaseSubject;
BaseSubjectId = state.BaseSubjectId;
SubjectId = state.SubjectId;
Direction = state.Direction;
QuestionNumber = state.QuestionNumber;
HomeworkId = state.HomeworkId;
Mark = state.Mark;
UserId = state.UserId;
}
// TODO: copy contructor in c#? huh?
public HomeworkState(HomeworkState state)
{
IndexOfBaseSubject = state.IndexOfBaseSubject;
BaseSubjectId = state.BaseSubjectId;
SubjectId = state.SubjectId;
Direction = state.Direction;
QuestionNumber = state.QuestionNumber;
HomeworkId = state.HomeworkId;
Mark = state.Mark;
UserId = state.UserId;
}
//updaUserState:
//
private void UpdateUserState(HomeworkState state)
{
RemoveUserState(state.UserId, state.HomeworkId);
//add new state
_homeworkStateDb.DbSet.Add(state);
_homeworkStateDb.SaveChanges();
}
//CreateUserState
//
private void CreateUserState(HomeworkState state)
{
_homeworkStateDb.DbSet.Add(state);
_homeworkStateDb.SaveChanges();
}
public ActionResult SolveHomework(int baseSubjectIndex,int subjectId, int homeworkId)
{
int userId = _userDb.GetUserIdByUsername(User.Identity.Name);
if (IsHomeworkSolved(homeworkId, userId)) {
return RedirectToAction("HomeworkSolved", new {homeworkId });
}
//send First parameters to start homeWork
HomeworkState newState=new HomeworkState(userId,baseSubjectIndex,subjectId,subjectId,0,0,homeworkId,0);
//if state exist ,update else create
if (IsUserStateExist(newState.UserId, newState.HomeworkId))
{
UpdateUserState(newState);
}
else
{
CreateUserState(newState);
}
return RedirectToAction("HomeworkFirstStage",new {homeworkId});
}
//HomeWorkLastStage
//in LastStage: we give questions with solution
public ActionResult HomeWorkLastStage(int homeworkId)
{
ViewBag.homeworkId = homeworkId;
int userId = _userDb.GetUserIdByUsername(User.Identity.Name);
HomeworkState state = GetUserState(userId, homeworkId);
HomeworkState nextState = new HomeworkState(GetUserState(userId, homeworkId));
if (_algorithm.MaxNumberOfStageQuestion <= state.QuestionNumber)
{
state.Mark = 0;
UpdateUserState(state);
return RedirectToAction("HomeWorkFirstStage",new{homeworkId});
}
ViewBag.question = _algorithm.GetNextQuestion(state,userId);
nextState.QuestionNumber++;
UpdateUserState(nextState);
return View();
}
//GET: HomeworkFirstStage:
//when we go down in tree subject we will be in FirstStage
//otherWise we are in LastStage
public ActionResult HomeworkFirstStage(int homeworkId)
{
ViewBag.homeworkId = homeworkId;
int userId = _userDb.GetUserIdByUsername(User.Identity.Name);
HomeworkState state = GetUserState(userId, homeworkId);
HomeworkState nextState = new HomeworkState(GetUserState(userId,homeworkId));
//update mark,and check if we need to go to children subject
if (_algorithm.IsGoDown(ref nextState))
{
List<int> subjectChildrenIds = _subjectDb.GetChildren(state.SubjectId);
try {
nextState.SubjectId = GetAvailableSubject(subjectChildrenIds);
nextState.Mark = 0;
nextState.QuestionNumber = 0;
}
catch(SubjectNotFoundException)
{
return RedirectToAction("HomeworkMaterial", new { state.HomeworkId });
}
}
else
{
//check if we Finish the current Level, and go Up.
if (state.QuestionNumber >= _algorithm.MaxNumberOfStageQuestion)
{
//if we get to the base subject mean we finish Exam
if (state.SubjectId == state.BaseSubjectId)
{
return RedirectToAction("PreSolveHomeWork", new{baseSubjectIndex = state.IndexOfBaseSubject+1,
homeWorkId = state.HomeworkId});
}
else
{
nextState.SubjectId = _subjectDb.GetSubjectParentId(state.SubjectId);
nextState.Mark = -100; //TODO: need to change that we fail
UpdateUserState(nextState);
return RedirectToAction("HomeworkFirstStage", new { state.HomeworkId });
}
}
}
//continue with the next state.
ViewBag.question = _algorithm.GetNextQuestion(nextState, userId);
nextState.QuestionNumber++;
UpdateUserState(nextState);
return View();
}
public bool IsGoDown(ref HomeworkState state)
{
// TODO: why ref? you're not changing the variable state.
return (state.Mark < -3) ;
}
public void UpdateMark(ref HomeworkState state, int questionId, string userAnswer)
{
Question question = _questionDb.GetQuestionById(questionId);
int questionSign = (question.correctAnswerNum == userAnswer)? 1 : -1;
// if the answer right add the level number to mark other sub level number from mark
state.Mark += questionSign*question.level;
}
