private bool TrySelectDefault(ItemWithScore[] itemsWithCalculatedScore, out ItemEvaluation? defaultItem)
{
var itemsWithNoReferences = itemsWithCalculatedScore.Where(x => !x.Item.ConditionsEvaluation.Any());
if (itemsWithNoReferences.Count() != 1)
{
defaultItem = null;
return false;
}
defaultItem = itemsWithNoReferences.Single().Item;
return true;
}
private bool IsRelevant(ItemEvaluation itemEvaluation)
{
var groupedBySubject = itemEvaluation.ConditionsEvaluation.GroupBy(x => x.Context.CurrentRuntimeContextItem.Key);
foreach (var group in groupedBySubject)
{
if(!IsRelevantToSubject(group))
{
return false;
}
}
return true;
}
private ItemEvaluation SelectBestMatchItem(ItemEvaluation[] evaluatedItems)
{
var itemsWithCalculatedScore = CalculateScore(evaluatedItems);
var highestScore = itemsWithCalculatedScore.Max(x => x.Score);
var itemWithHighestScores = itemsWithCalculatedScore.Where(x => x.Score == highestScore).ToArray();
ItemEvaluation? defaultItem;
if (itemWithHighestScores.Count() > 1)
{
if (this.TrySelectDefault(itemsWithCalculatedScore, out defaultItem))
{
return defaultItem.Value;
}
else
{
throw new ItemsWithConflictingHighestScoreException(itemsWithConflictingScore: itemWithHighestScores, allItems: itemsWithCalculatedScore, highestScore: highestScore);
}
}
return itemWithHighestScores.Single().Item;
}