/// <summary>
/// Randomly gets <see cref="ILotteryUser"/> from <see cref="Users"/> list
/// </summary>
/// <param name="removeWinner">If <c>true</c> user will be removed from <c>Users</c> list</param>
/// <returns>Randomly found <see cref="ILotteryUser"/></returns>
/// <exception cref="ProfessorMewData.Exceptions.Guild.ProfessorMewException">Thrown when either <see cref="Users"/> or <see cref="Prizes"/> is empty</exception>
public ILotteryUser GetWinner(bool removeWinner = false)
{
if (!CanGetWinner)
{
throw new ProfessorMewData.Exceptions.Guild.ProfessorMewException("Cannot get winner");
}
ILotteryUser winner = null;
using (var cryptoRNG = new CryptoRNGCore.RandomNumberGenerator())
{
double r = cryptoRNG.GetDouble(0, 1) * Users.Sum(x => x.Tickets);
double min = 0,
max = 0;
foreach (var user in Users)
{
max += user.Tickets;
if (min <= r && r < max)
{
winner = user;
break;
}
}
}
if (removeWinner && !winner.IsEmpty)
{
Users.Remove(winner);
}
return(winner);
}
public static void AddTickets(this ILotteryUser user, int ticketAmount)
{
if (((long)user.Tickets + ticketAmount) > int.MaxValue)
{
user.Tickets = int.MaxValue;
return;
}
user.Tickets += Math.Abs(ticketAmount);
}
public static void ReduceTickets(this ILotteryUser user, int ticketAmount)
{
if (((long)user.Tickets - ticketAmount) < int.MinValue)
{
user.Tickets = int.MinValue;
return;
}
user.Tickets = user.Tickets - Math.Abs(ticketAmount) < 0 ? 0 : user.Tickets - Math.Abs(ticketAmount);
}
