public override async Task Decide(Board board, Decider decider)
{
if (_tile.TileType.Suit == Suit.Jihai && _tile.Index < 4 && board.IsFirstGoAround)
{
if (board.Seats.SelectMany(s => s.Discards).Count(t => t.TileType == _tile.TileType) == 4)
{
_nextState = new Abort();
return;
}
}
var fourKanAbortIfNoRon = board.Seats.SelectMany(s => s.Melds).Count(m => m.IsKan) == 4 && board.Seats.Count(s => s.Melds.Any(m => m.IsKan)) > 1;
var reactionTasks = new Task <DiscardResponse> [4];
var clients = new Client[4];
for (var i = 0; i < 4; i++)
{
if (i == board.ActiveSeatIndex)
{
reactionTasks[i] = Task.FromResult(DiscardResponse.Pass());
clients[i] = new Client(i, DiscardActions.Pass);
continue;
}
var actions = GetPossibleActions(board, i, fourKanAbortIfNoRon);
if (actions != DiscardActions.Pass)
{
reactionTasks[i] = decider.OnDiscard(actions, i);
clients[i] = new Client(i, actions);
continue;
}
reactionTasks[i] = Task.FromResult(DiscardResponse.Pass());
clients[i] = new Client(i, DiscardActions.Pass);
}
await Task.WhenAll(reactionTasks);
for (var i = 0; i < 4; i++)
{
reactionTasks[i].Result.Execute(clients[i]);
if (clients[i].IgnoredRon)
{
_ignoredRonSeats.Add(i);
}
}
var ronCount = clients.Count(c => c.Ron);
if (ronCount == 3)
{
_nextState = new Abort();
return;
}
if (ronCount > 0)
{
_nextState = new Ron(clients.Where(r => r.Ron).Select(r => r.SeatIndex));
return;
}
if (fourKanAbortIfNoRon)
{
_nextState = new Abort();
return;
}
var kan = clients.FirstOrDefault(c => c.Daiminkan);
if (kan != null)
{
_nextState = new Daiminkan(kan.SeatIndex);
return;
}
var pon = clients.FirstOrDefault(c => c.Pon);
if (pon != null)
{
_nextState = new Pon(pon.SeatIndex, pon.Tile0 !, pon.Tile1 !, pon.Discard !);
return;
}
var chii = clients.FirstOrDefault(c => c.Chii);
if (chii != null)
{
_nextState = new Chii(chii.SeatIndex, chii.Tile0 !, chii.Tile1 !, chii.Discard !);
return;
}
if (board.Wall.RemainingDraws == 0)
{
_nextState = new ExhaustiveDraw();
}
else
{
_nextState = new Draw((board.ActiveSeatIndex + 1) % 4);
}
}
public override void KyuushuKyuuhai()
{
NextState = new Abort();
}
