private IEnumerable <KeywordPhraseReference> MergeWeakReferences(
ICollection <KeywordPhraseReference> weakReferences, IEnumerable <PhraseIdWithRankModel> tops)
{
var sortedWeakReferences = new List <KeywordPhraseReference>(weakReferences);
foreach (var top in tops)
{
if (sortedWeakReferences.Count < 10)
{
sortedWeakReferences.Add(new KeywordPhraseReference
{
Convergence = top.Rank,
Phrase = Phrases.Single(x => x.Id == top.PhraseId)
});
continue;
}
sortedWeakReferences.Sort(new WeakReferenceComparer());
if (!(top.Rank > sortedWeakReferences[9].CompositeConvergance))
{
continue;
}
if (sortedWeakReferences.Any(x => x.Phrase.Value.Equals(Phrases.Single(g => g.Id == top.PhraseId).Value)))
{
continue;
}
var referenceToRemove = sortedWeakReferences.ElementAt(9);
KeywordPhraseReferences.Remove(referenceToRemove);
sortedWeakReferences.RemoveAt(9);
var referenceToAdd = new KeywordPhraseReference
{
Convergence = top.Rank,
Phrase = Phrases.Single(x => x.Id == top.PhraseId)
};
KeywordPhraseReferences.Add(referenceToAdd);
sortedWeakReferences.Add(referenceToAdd);
sortedWeakReferences.Sort(new WeakReferenceComparer());
}
weakReferences = sortedWeakReferences;
if (weakReferences.Count != 10)
{
throw new WeakReferenceCountException();
}
return(weakReferences);
}
public IEnumerable <Phrase> TheAlgorithm(string keyword)
{
var keywordEntity = Keywords.Include(x => x.WeakReferences.Select(r => r.Phrase)).SingleOrDefault(x => x.Value == keyword) ?? new Keyword {
Value = keyword
};
keywordEntity.Count++;
if (keywordEntity.Phrase != null)
{
SaveChanges();
return(new[] { keywordEntity.Phrase });
}
if (keywordEntity.WeakReferences == null)
{
keywordEntity.WeakReferences = new Collection <KeywordPhraseReference>();
}
var weakReferences = keywordEntity.WeakReferences;
if (!weakReferences.Any())
{
var outp = new List <Phrase>();
foreach (var top in GetTopTen(keyword))
{
var phrase = Phrases.Single(x => x.Id == top.PhraseId);
var reference = new KeywordPhraseReference
{
Convergence = top.Rank,
Phrase = phrase,
Keyword = keywordEntity
};
KeywordPhraseReferences.Add(reference);
outp.Add(reference.Phrase);
}
SaveChanges();
if (outp.Count != 10)
{
throw new Exception("Powinno być dokładnie 10 luźnych referencji!");
}
return(outp);
}
var mergedReferences = MergeWeakReferences(weakReferences, GetTopTen(keyword));
SaveChanges();
return(mergedReferences.Select(x => x.Phrase));
}