public async Task <int?> AdjustRatingAsync(int userId, int puzzleId, bool correct, DateTime attemptStarted, DateTime attemptEnded, string variant)
{
// Glicko-2 library: https://github.com/MaartenStaa/glicko2-csharp
User user = await userRepository.FindByIdAsync(userId);
Puzzle puzzle = await puzzleRepository.GetAsync(puzzleId);
if (user.SolvedPuzzles.Contains(puzzle.ID) || puzzle.InReview || puzzle.Author == user.ID || puzzle.Reviewers.Contains(user.ID))
{
return(null);
}
Glicko2.RatingCalculator calculator = new Glicko2.RatingCalculator();
double oldUserRating = user.Ratings[variant].Value;
double oldPuzzleRating = puzzle.Rating.Value;
Glicko2.Rating userRating = new Glicko2.Rating(calculator, oldUserRating, user.Ratings[variant].RatingDeviation, user.Ratings[variant].Volatility);
Glicko2.Rating puzzleRating = new Glicko2.Rating(calculator, oldPuzzleRating, puzzle.Rating.RatingDeviation, puzzle.Rating.Volatility);
Glicko2.RatingPeriodResults results = new Glicko2.RatingPeriodResults();
results.AddResult(correct ? userRating : puzzleRating, correct ? puzzleRating : userRating);
calculator.UpdateRatings(results);
double newUserRating = userRating.GetRating();
user.Ratings[variant] = new Rating(newUserRating, userRating.GetRatingDeviation(), userRating.GetVolatility());
user.SolvedPuzzles.Add(puzzle.ID);
if (correct)
{
user.PuzzlesCorrect++;
}
else
{
user.PuzzlesWrong++;
}
await userRepository.UpdateAsync(user);
double newPuzzleRating = puzzleRating.GetRating();
Task urt = puzzleRepository.UpdateRatingAsync(puzzle.ID, new Rating(newPuzzleRating, puzzleRating.GetRatingDeviation(), puzzleRating.GetVolatility()));
Attempt attempt = new Attempt(userId, puzzleId, attemptStarted, attemptEnded, newUserRating - oldUserRating, newPuzzleRating - oldPuzzleRating, correct);
Task ara = attemptRepository.AddAsync(attempt);
RatingWithMetadata rwm = new RatingWithMetadata(user.Ratings[variant], attemptEnded, user.ID, variant);
Task rra = ratingRepository.AddAsync(rwm);
await urt;
await ara;
await rra;
return((int)newUserRating - (int)oldUserRating);
}
public async Task AddAsync(RatingWithMetadata ratingWithMetadata)
{
await ratingCollection.InsertOneAsync(ratingWithMetadata);
}
public void Add(RatingWithMetadata ratingWithMetadata)
{
ratingCollection.InsertOne(ratingWithMetadata);
}
