public void RecordAnswer(Question question, bool correct)
{
question.RecordAnswer(correct);
}
public void LoadAnswers(TermKind from, TermKind to)
{
FromTerm = from;
ToTerm = to;
questions.Clear();
string[] input = new string[0];
if (File.Exists(AnswerDataFileName)) {
input = File.ReadAllLines(AnswerDataFileName);
}
for (int i = 0; i < questionData.Count; ++i) {
QuestionData qd = questionData[i];
Question q = new Question();
GetQuestionAnswerData(from, qd, out q.QuestionStyle, out q.QuestionString);
GetQuestionAnswerData(to, qd, out q.AnswerStyle, out q.AnswerString);
if (i < input.Length) {
q.LoadAnswers(input[i]);
}
questions.Add(q);
}
}
public Question NextQuestion()
{
QuizStats stats = CalcStats();
Question newQuestion = null;
QuestionStatus targetStatus;
int targetIndex;
int count = 20;
do {
if (stats.CountRight > 0 && random.NextDouble() < 0.3) {
// 30% chance to review one we know.
targetStatus = QuestionStatus.Right;
targetIndex = random.Next(stats.CountRight);
}
else if (stats.CountWrong + stats.CountPartial < 3 && stats.CountUnseen > 0 && random.NextDouble() < 0.5) {
// If we have < 3 that we don't know, add a new one in.
targetStatus = QuestionStatus.NotSeen;
targetIndex = random.Next(stats.CountUnseen);
}
else if (random.Next(2 * stats.CountWrong + stats.CountPartial) < 2 * stats.CountWrong) {
// Choose a question we don't know yet, with wrong weighted twice as partial.
targetStatus = QuestionStatus.Wrong;
targetIndex = random.Next(stats.CountWrong);
}
else {
targetStatus = QuestionStatus.Partial;
targetIndex = random.Next(stats.CountPartial);
}
foreach (Question q in questions) {
QuestionStatus status = q.Status;
if (status == targetStatus) {
if (targetIndex == 0) {
newQuestion = q;
break;
}
else {
--targetIndex;
}
}
}
if (newQuestion == null)
newQuestion = questions[random.Next(questions.Count)];
} while (newQuestion == lastQuestion && count-- > 0); // Don't repeat the same question in a row unless we must.
lastQuestion = newQuestion;
return newQuestion;
}
