public async Task <AuctionBid> AddOrUpdateBid(string item, string character, string rank, int bid, IMessage message)
{
// First make sure we can make a valid bid out of it.
if (!ranks.TryGetValue(rank, out RankConfiguration rankConfig))
{
throw new ArgumentException($"Rank {rank} does not exist.");
}
if (!state.Auctions.TryGetValue(item, out Auction auction))
{
throw new AuctionNotFoundException(item);
}
int characterId = await dkpProcessor.GetCharacterId(character);
PlayerPoints points = await dkpProcessor.GetDkp(characterId);
int pointsAlreadyBid = state.Auctions.Values.SelectMany(x => x.Bids)
.Where(b => b.CharacterId == characterId && // From This character
b.Auction != auction) // Don't count this current auction, because we're replacing it.
.Sum(x => x.BidAmount) * rankConfig.PriceMultiplier;
decimal availableDkp = (points.PointsCurrentWithTwink - pointsAlreadyBid) / rankConfig.PriceMultiplier;
if (availableDkp < bid)
{
throw new InsufficientDkpException($"{character} only has {availableDkp} left to bid with. Cancel some bids, or bid less!");
}
AuctionBid newBid = auction.Bids.AddOrUpdate(new AuctionBid(auction, character, characterId, bid, rankConfig, message.Author));
log.LogInformation($"Created bid: {newBid}");
await message.Channel.SendMessageAsync($"Bid accepted for **{newBid.Auction}**\n"
+ $"```\"{auction.Name}\" {newBid}```"
+ $"If you win, you could pay up to **{newBid.BidAmount * newBid.Rank.PriceMultiplier}**.\n"
+ $"If you wish to modify your bid before the auction completes, simply enter a new bid in the next **{auction.MinutesRemaining:##.#}** minutes.\n"
+ "If you wish to cancel your bid use the following syntax:\n"
+ $"```\"{newBid.Auction.Name}\" cancel```");
return(newBid);
}
private AuctionBid RemoveWinner(List <AuctionBid> bids)
{
bids.Sort();
log.LogTrace("Finding best winner from: ({0})", string.Join(", ", bids));
List <int> winningIndexes = new List <int>();
for (int i = 0; i < bids.Count; i++)
{
AuctionBid bid = bids[i];
if (winningIndexes.None())
{
// First winner
winningIndexes.Add(i);
}
else if (bids[winningIndexes.Last()].CompareTo(bid) == 0)
{
// Tied for first winner.
winningIndexes.Add(i);
}
else
{
// Done
break;
}
}
log.LogTrace("Found {0} winners.", winningIndexes.Count);
if (winningIndexes.None())
{
return(null);
}
int winningIndex = winningIndexes.OrderBy(x => random.Next()).First();
AuctionBid winner = bids[winningIndex];
bids.RemoveAt(winningIndex);
return(winner);
}
public CompletedAuction CalculateWinners(Auction auction)
{
List <AuctionBid> bids = auction.Bids.ToList();
log.LogTrace("Finding winners for {0} from bids submitted: ({1})", auction.DetailDescription, string.Join("', ", auction.Bids));
List <AuctionBid> winners = new List <AuctionBid>();
for (int i = 0; i < auction.Quantity; i++)
{
if (bids.Any())
{
// Grab the first winner.
AuctionBid winner = RemoveWinner(bids);
winners.Add(winner);
}
}
List <WinningBid> winningBids = CalculatePrices(winners, bids);
log.LogInformation("{0} found {1} winners: {2}", auction.DetailDescription, winners.Count, string.Join(", ", winners));
return(new CompletedAuction(auction, winningBids));
}
private List <WinningBid> CalculatePrices(ICollection <AuctionBid> winners, ICollection <AuctionBid> losers)
{
List <WinningBid> winningBids = new List <WinningBid>(winners.Count);
int winnerNumber = 1;
foreach (AuctionBid winner in winners.OrderBy(x => x))
{
int applicableLooserBid = 0;
bool loserTied = false;
if (losers.Any())
{
AuctionBid loser = null;
// check and see if we won because we out-bid somebody's cap.
AuctionBid outbidWinner = winners.OrderBy(x => x).Skip(winners.Count).FirstOrDefault();
if (outbidWinner != null && outbidWinner.MaxBid < winner.BidAmount)
{
// If we outbid their cap, we'll use them to calculate our price instead of the first unsuccessful bid.
loser = outbidWinner;
}
if (loser == null)
{
// You lose! Good DAY sir!
loser = losers.OrderBy(x => x).FirstOrDefault();
//If the loser tied a winner, that adjusts the final price.
//But only if they didn't outbid their cap'
if (loser?.BidAmount == winners.LastOrDefault()?.BidAmount &&
loser.BidAmount <= loser.MaxBid)
{
loserTied = true;
}
}
if (loser != null)
{
if (winner.Rank.MaxBid > loser.Rank.MaxBid && winner.BidAmount > loser.Rank.MaxBid)
{
// If our bid cap and is higher than their bid cap, and we bid over their cap. reduce their bid.
applicableLooserBid = Math.Min(loser.BidAmount, loser.Rank.MaxBid);
}
else
{
// Otherwise
applicableLooserBid = loser.BidAmount;
}
}
}
int price;
if (loserTied)
{
// If the first loser was a tie, everybody pays the tie price.
price = applicableLooserBid;
}
else
{
// They pay loser+1, but not more than their bid. Aka full price if a tie.
price = applicableLooserBid + 1;
}
// Never go over their bid amount.
price = Math.Min(price, winner.BidAmount);
int finalPrice = price * winner.Rank.PriceMultiplier;
winningBids.Add(new WinningBid(winner, finalPrice));
winnerNumber++;
}
return
(winningBids);
}
public WinningBid(AuctionBid bid, int price)
{
Bid = bid;
Price = price;
}