namespace TarninaHub.Application.Matchmaking;

public sealed record RankedItem<T>(T Item, double Score);

public static class SemanticRanker
{
    public static IReadOnlyList<RankedItem<T>> Rank<T>(
        IReadOnlyList<float> queryVector,
        IEnumerable<(T Item, IReadOnlyList<float> Vector)> candidates,
        int topK,
        double minScore = 0)
    {
        return candidates
            .Select(candidate => new RankedItem<T>(candidate.Item, VectorMath.CosineSimilarity(queryVector, candidate.Vector)))
            .Where(ranked => ranked.Score >= minScore)
            .OrderByDescending(ranked => ranked.Score)
            .Take(topK)
            .ToList();
    }
}