/// <summary>
/// Gets the level that will be associated to the SRS entry matching the
/// given group in the current state.
/// </summary>
/// <returns>New level for the entity.</returns>
private SrsLevel GetUpdatedLevel(SrsQuestionGroup group)
{
// Take the upper/lower level depending on the success state.
int modifier = group.IsWrong ? -1 : 1;
SrsLevel newLevel = newLevel = SrsLevelStore.Instance.GetLevelByValue(
group.Reference.CurrentGrade + modifier);
// If the upper/lower level could not be obtained, (as this may
// be the case when at max/min level), use the current one.
// Note that this still may return a null value if the levels
// were not loaded correctly or if the configuration has changed.
return(newLevel ?? SrsLevelStore.Instance.GetLevelByValue(
group.Reference.CurrentGrade));
}
/// <summary>
/// Processes the success/failure logic for the last answered question.
/// Executed before getting to the next question.
/// </summary>
private void ProcessLastSubmission()
{
if (ReviewState == SrsReviewStateEnum.Success)
{
// Success. Set the question as answered.
CurrentQuestion.IsAnswered = true;
// If both questions of the group have been answered.
if (!CurrentQuestionGroup.GetUnansweredQuestions().Any())
{
SrsQuestionGroup group = CurrentQuestionGroup;
// Remove the group from the batch.
_currentBatch.Remove(group);
// Start the update group method after making sure the
// level store is finished loading.
SrsLevelStore.Instance.IssueWhenLoaded(
() => {
UpdateAnsweredGroup(group);
});
// Update the answered reviews count.
AnsweredReviewsCount++;
// Fill the batch to compensate for the removed group.
if (!IsWrappingUp)
{
FillCurrentBatch();
}
else if (_currentBatch.Count == 0)
{
StopSessionCommand.Execute(null);
}
}
}
else if (ReviewState == SrsReviewStateEnum.Failure)
{
// Wrong answer.
// Don't set the question as answered.
// Set the group as wrong.
CurrentQuestion.ParentGroup.IsWrong = true;
}
}
/// <summary>
/// Called to update the SRS entry referred by a question group that was
/// answered.
/// </summary>
/// <param name="group">Question group answered.</param>
private void UpdateAnsweredGroup(SrsQuestionGroup group)
{
// Get the new level of the item.
SrsLevel newLevel = GetUpdatedLevel(group);
// Update its grade and next answer date.
if (newLevel != null)
{
// Set the next answer date according to the delay of the new level.
if (newLevel.Delay.HasValue)
{
group.Reference.NextAnswerDate =
DateTime.UtcNow
+ newLevel.Delay.Value;
}
else
{
group.Reference.NextAnswerDate = null;
}
group.Reference.CurrentGrade = newLevel.Value;
}
else
{
// If there is no new level and no current level, the delay is null.
group.Reference.NextAnswerDate = null;
}
// Update the success/failure count.
if (group.IsWrong)
{
group.Reference.FailureCount++;
}
else
{
group.Reference.SuccessCount++;
}
// Update the entry in the DB.
UpdateEntry(group.Reference);
}