static NetBattlefield ProduceFakeBFIfNeeded(int playerID, NetBattlefield bf)
{
//fake battlefield will contain all friendly cards currently not on battlefield
//positioned on free positions so that AI can see if it can produce
//any targets. there is no simulation involved so fake state should not harm "thinking"
//we will not need fake BF IF all owned cards are already on BF.
HashSet <NetCard> ownCastedCards = bf.GetCardsOnBattelfield(playerID);
NetCardPlayerData ncd = bf.GetPlayerByPlayerID(playerID);
if (ncd == null || NetType.IsNullOrEmpty(ncd.HandCards))
{
return(bf);
}
List <int> ownCardsAtHand = ncd.HandCards.value;
List <NetCard> cardsToCast = new List <NetCard>();
//this is different set than just cards which were used, because card which casts summons or
//does support will not be present on battlefield and still cost more than base AP
foreach (var v in ownCardsAtHand)
{
NetCard nc = bf.GetCardByID(v);
if (!ownCastedCards.Contains(nc))
{
cardsToCast.Add(nc);
}
}
if (cardsToCast.Count == 0)
{
return(bf);
}
//there are cards which should be represented on battle positions
//which requires new BF
//we would do simple but fake casts
NetBattlefield bf2 = bf.CloneAndRemember();
int halfSize = bf2.BattlefieldSize / 2;
int start = playerID == 0 ? 0 : halfSize;
int cardListIndex = 0;
for (int i = 0; i < halfSize; i++)
{
if (cardListIndex == cardsToCast.Count)
{
break;
}
int index = i + start;
if (bf2.BattlefieldPositions.value[index] == 0)
{
bf2.BattlefieldPositions.value[index] = cardsToCast[cardListIndex].CardID;
}
}
return(bf2);
}