public void DrawFreeTicketForUser(User user)
{
var random = new Random(); // should be injected as service to make class testable
IWinChanceCalculator calculator = _calculatorFactory.GetCalculatorForUser(user);
WinChance chance = calculator.CalculateWinChance(user);
Draw draw = new Draw(random.Next(100));
if (chance.IsSatisfiedBy(draw))
{
user.FreeTicketsCount++;
DomainEventBus.Current.Raise(new FreeTicketGranted(user.Id, user.FreeTicketsCount));
}
}
internal bool IsSatisfiedBy(Draw draw)
{
return draw.Value < PercentageOfWin;
}