public Question PopQuestion(IQuestionKey keyToUseForReference)
{
ResolveDeletionsAndAdditions();
PhraseCustomization questionToInsert;
try
{
questionToInsert = AdditionsAndInsertions.First();
}
catch (Exception e)
{
throw new InvalidOperationException("PopQuestion should only be called for a customization that is not tied to any other question and has " +
"at least one insertion or addition.", e);
}
AdditionsAndInsertions.RemoveAt(0);
var newQ = new Question(keyToUseForReference.ScriptureReference, keyToUseForReference.StartRef, keyToUseForReference.EndRef,
questionToInsert.ModifiedPhrase ?? questionToInsert.OriginalPhrase, questionToInsert.Answer);
SetExcludedAndModified(newQ);
if (AllAnswers != null && AllAnswers.Any()) // Note: If there are any, there are at least 2
{
newQ.Answers = AllAnswers.ToArray();
}
return(newQ);
}
private void FinishResolvingIfNoMorePairsCanBeDeleted()
{
if (Deletions.Any() && AdditionsAndInsertions.Count > Deletions.Count)
{
return;
}
if (AdditionsAndInsertions.Count <= 1)
{
if (Deletions.Count > 1)
{
// This should probably be an exception, but maybe we can recover...
Deletions.RemoveRange(1, Deletions.Count - 1);
Debug.Fail($"There were more deletions than additions for {Deletions.Single().Key}.");
}
}
else if (Deletions.Count <= 1)
{
// REVIEW: We're assuming that the first (remaining) addition is the "base" one (i.e., any other non-duplicates will
// be hanging off of it as an insertion or addition). If this is not true, we'll need to look through the list to find
// the first one whose OriginalPhrase is not the ModifiedPhrase of any other addition/insertion in the list.
var baseAddition = AdditionsAndInsertions[0].ModifiedPhrase;
var i = 0;
while (i + 1 < AdditionsAndInsertions.Count)
{
// We assume that earlier ones in the list are older versions whose answers are less likely to be the most desirable
// one, so we delete ealier ones first so that the last one survives (and its answer will be inserted first in the
// list. Sadly, this is probably the best we can do.
var iNewBase = AdditionsAndInsertions.FindIndex(i + 1, a => a.ModifiedPhrase == baseAddition);
if (iNewBase < 0)
{
break;
}
RemoveAddition(i);
i = iNewBase;
}
}
else
{
return;
}
if (AllAnswers.Any())
{
var bestAnswer = AdditionsAndInsertions.First().Answer;
if (!String.IsNullOrWhiteSpace(bestAnswer) && !AllAnswers.Any(a => a.Contains(bestAnswer)))
{
AllAnswers.Insert(0, bestAnswer);
}
else if (AllAnswers.Count == 1)
{
AdditionsAndInsertions.First().Answer = AllAnswers[0];
AllAnswers = null;
}
}
m_isResolved = true;
}