private async Task UpdateLeaderboard(Challenge.Challenge challenge, IAsyncEnumerable <RankedSolution> solutions)
{
// Update trueskill
await _skillUpdate.ApplyChallengeResults(challenge.Id);
const uint maxScore = 10;
var score = maxScore;
// Enumerate through each group of equally ranked users
var ranks = solutions.GroupBy(a => a.Rank).OrderBy(a => a.Key);
await foreach (var rank in ranks)
{
// Award all users at the same rank some points
var count = 0;
await foreach (var solution in rank)
{
count++;
await _leaderboard.AddScore(solution.Solution.UserId, score *(uint)challenge.Difficulty);
}
// If there was only one user in the top rank, award them a bonus
if (count == 1 && score == maxScore)
{
await _leaderboard.AddScore((await rank.SingleAsync()).Solution.UserId, (uint)challenge.Difficulty);
}
// Award at least one point to every entrant
if (score > 1)
{
score--;
}
}
// Find the smallest solution, if there's only one of them (i.e. no tie for smallest) award a bonus point
var smallestGroup = await solutions.GroupBy(a => a.Solution.Yolol.Length).AggregateAsync((a, b) => a.Key < b.Key ? a : b);
if (await smallestGroup.CountAsync() == 1)
{
await _leaderboard.AddScore((await smallestGroup.FirstAsync()).Solution.UserId, (uint)challenge.Difficulty);
}
}
public async Task GivePoints(IUser user, uint score)
{
await _leaderboard.AddScore(user.Id, score);
}