public async Task AddWinnerAsync(DrawingWinner winner)
{
await _context.DrawingWinners
.AddAsync(_mapper.Map <Model.DrawingWinner>(winner));
}
public async Task <Drawing> PerformDrawingAsync(Drawing drawing)
{
// todo validate site
int siteId = GetCurrentSiteId();
int authUserId = GetClaimId(ClaimType.UserId);
if (HasPermission(Permission.PerformDrawing))
{
// insert drawing
drawing.DrawingCriterion = default(DrawingCriterion);
drawing.Id = default(int);
drawing = await _drawingRepository.AddSaveAsync(authUserId, drawing);
// pull list of eligible users
var eligibleUserIds
= await _drawingCriterionRepository.GetEligibleUserIdsAsync(drawing.DrawingCriterionId);
// ensure there are enough eligible users to do the drawing
if (drawing.WinnerCount > eligibleUserIds.Count())
{
throw new GraException($"Cannot draw {drawing.WinnerCount} from an eligible pool of {eligibleUserIds.Count()} participants.");
}
// prepare and perform the drawing
var remainingUsers = new List <int>(eligibleUserIds);
var rng = System.Security.Cryptography.RandomNumberGenerator.Create();
var randomBytes = new byte[sizeof(int)];
for (int count = 1; count <= drawing.WinnerCount; count++)
{
rng.GetBytes(randomBytes);
int random = System.Math.Abs(System.BitConverter.ToInt32(randomBytes, 0));
int randomUserId = remainingUsers.ElementAt(random % remainingUsers.Count());
var winner = new DrawingWinner
{
DrawingId = drawing.Id,
UserId = randomUserId
};
// if there's an associated notification, send it now
if (!string.IsNullOrEmpty(drawing.NotificationSubject) &&
!string.IsNullOrEmpty(drawing.NotificationMessage))
{
var mail = new Mail
{
SiteId = siteId,
Subject = drawing.NotificationSubject,
Body = drawing.NotificationMessage,
ToUserId = winner.UserId,
DrawingId = drawing.Id
};
mail = await _mailRepository.AddSaveAsync(authUserId, mail);
winner.MailId = mail.Id;
}
// add the winner - does not perform a save
await _drawingRepository.AddWinnerAsync(winner);
// remove them so they aren't drawn twice
remainingUsers.Remove(randomUserId);
}
await _drawingRepository.SaveAsync();
// return the fully-populated drawing
return(await _drawingRepository.GetByIdAsync(drawing.Id));
}
else
{
_logger.LogError($"User {authUserId} doesn't have permission to perform drawings.");
throw new GraException("Permission denied.");
}
}
