private List <LottoPrizeInfoModel> GetPrizeInfo(LottoItemModel lottoItem)
{
var prizeInfo = new List <LottoPrizeInfoModel>();
var totalAmount = lottoItem.Rate * lottoItem.TicketsInDraw;
var siteFee = (totalAmount / 100m) * lottoItem.Fee;
var prizePool = totalAmount - siteFee;
var prizePoolFraction = prizePool / 100m;
var prizeWeights = LottoHelpers.GetPrizeWeights(lottoItem.Prizes);
for (int i = 0; i < prizeWeights.Count; i++)
{
prizeInfo.Add(new LottoPrizeInfoModel
{
Percentage = prizeWeights[i],
Position = (i + 1),
Prize = Math.Round(prizePoolFraction * prizeWeights[i], 8)
});
}
return(prizeInfo);
}
/// <summary>
/// Processes the lotto items.
/// </summary>
private async Task ProcessLotto()
{
try
{
var payouts = new List <PrizePayout>();
using (var context = ExchangeDataContextFactory.CreateContext())
{
Log.Message(LogLevel.Info, "[ProcessLotto] - Processing LottoItems...");
var dueLottoDraws = await context.LottoItem.Where(x => x.Status != LottoItemStatus.Disabled && DateTime.UtcNow >= x.NextDraw).ToListNoLockAsync();
if (dueLottoDraws.IsNullOrEmpty())
{
// no draws ready
Log.Message(LogLevel.Info, "[ProcessLotto] - No lotto draws are due, Waiting...");
return;
}
Log.Message(LogLevel.Info, "[ProcessLotto] - {0} lotto draws found.", dueLottoDraws.Count());
foreach (var lottoDraw in dueLottoDraws)
{
Log.Message(LogLevel.Info, "[ProcessLotto] - Processing LottoItem, Id: {0}, Name: {1}, Currency: {2}", lottoDraw.Id, lottoDraw.Name, lottoDraw.CurrencyId);
// 1. sum up total tickets, subtract site fee
var tickets = await context.LottoTicket.Where(x => !x.IsArchived && x.LottoItemId == lottoDraw.Id && x.DrawId == lottoDraw.CurrentDrawId).ToListNoLockAsync();
if (!tickets.IsNullOrEmpty())
{
Log.Message(LogLevel.Info, "[ProcessLotto] - {0} tickets found for draw.", tickets.Count());
// Archive all the tickets
foreach (var ticket in tickets)
{
ticket.IsArchived = true;
}
// Calculate prize pool
var totalAmount = lottoDraw.Rate * tickets.Count();
var siteFee = (totalAmount / 100m) * lottoDraw.Fee;
var prizePool = totalAmount - siteFee;
var prizePoolFraction = prizePool / 100m;
var prizeWeights = LottoHelpers.GetPrizeWeights(lottoDraw.Prizes);
var winningTicketIds = GetWinningLottoItemIds(tickets.Select(x => x.Id), lottoDraw.Prizes);
Log.Message(LogLevel.Info, "[ProcessLotto] - LottoItem draw info, Total: {0}, PrizePool: {1}, Fee: {2}", totalAmount, prizePool, siteFee);
// Calculate user prizes
var drawTime = lottoDraw.NextDraw;
for (int i = 0; i < prizeWeights.Count; i++)
{
var prizeWeight = prizeWeights[i];
var winningTicket = tickets.FirstOrDefault(x => x.Id == winningTicketIds[i]);
var amount = Math.Round(prizePoolFraction * prizeWeight, 8);
payouts.Add(new PrizePayout
{
UserId = winningTicket.UserId,
CurrencyId = lottoDraw.CurrencyId,
Amount = amount
});
context.LottoHistory.Add(new LottoHistory
{
Amount = amount,
Percent = prizeWeight,
LottoItemId = lottoDraw.Id,
Position = (i + 1),
Timestamp = drawTime,
UserId = winningTicket.UserId,
LottoTicketId = winningTicket.Id,
LottoDrawId = lottoDraw.CurrentDrawId,
TotalAmount = prizePool
});
Log.Message(LogLevel.Info, "[ProcessLotto] - User payout info, UserId: {0}, Position: {1}, Weight: {2}, Amount: {3}", winningTicket.UserId, (i + 1), prizeWeight, amount);
}
}
else
{
Log.Message(LogLevel.Info, "[ProcessLotto] - No tickets found for draw.");
}
// 5. update LottoItem
lottoDraw.Status = LottoItemStatus.Finished;
if (lottoDraw.LottoType == LottoType.Recurring || (lottoDraw.LottoType == LottoType.RecurringExpire && lottoDraw.Expires > DateTime.UtcNow))
{
lottoDraw.Status = LottoItemStatus.Active;
lottoDraw.CurrentDrawId = lottoDraw.CurrentDrawId + 1;
lottoDraw.NextDraw = lottoDraw.NextDraw.AddHours(lottoDraw.Hours);
Log.Message(LogLevel.Info, "[ProcessLotto] - Set next draw date for recurring lotto, NextDraw: {0}", lottoDraw.NextDraw);
}
Log.Message(LogLevel.Info, "[ProcessLotto] - Processing LottoItem complete.");
}
// commit the transaction
Log.Message(LogLevel.Debug, "[ProcessLotto] - Comitting database transaction...");
await context.SaveChangesAsync();
Log.Message(LogLevel.Debug, "[ProcessLotto] - Comitted database transaction.");
}
// Send Winnings
await PayoutUsers(payouts);
Log.Message(LogLevel.Info, "[ProcessLotto] - Processing LottoItems complete.");
}
catch (Exception ex)
{
Log.Exception("[ProcessLotto] - An exception occured processing LottoItem.", ex);
}
}
