private Card chooseCardOnStack(SpellAbility sa, Player ai, Game game) {
for (SpellAbilityStackInstance si : game.getStack()) {
final Card source = si.getSourceCard();
final SpellAbility abilityOnStack = si.getSpellAbility(true);
if (sa.hasParam("Choices")
&& !abilityOnStack.getHostCard().isValid(sa.getParam("Choices"), ai, sa.getHostCard())) {
continue;
}
final ApiType threatApi = abilityOnStack.getApi();
if (threatApi != ApiType.DealDamage && threatApi != ApiType.DamageAll) {
continue;
}
List<? extends GameObject> objects = getTargets(abilityOnStack);
if (!abilityOnStack.usesTargeting()
&& !abilityOnStack.hasParam("Defined")
&& abilityOnStack.hasParam("ValidPlayers"))
objects =
AbilityUtils.getDefinedPlayers(
source, abilityOnStack.getParam("ValidPlayers"), abilityOnStack);
if (!objects.contains(ai) || abilityOnStack.hasParam("NoPrevention")) {
continue;
}
int dmg =
AbilityUtils.calculateAmount(source, abilityOnStack.getParam("NumDmg"), abilityOnStack);
if (ComputerUtilCombat.predictDamageTo(ai, dmg, source, false) <= 0) {
continue;
}
return source;
}
return null;
}
@Override
public PaymentDecision visit(CostExileFromStack cost) {
Integer c = cost.convertAmount();
if (c == null) {
final String sVar = ability.getSVar(cost.getAmount());
// Generalize cost
if (sVar.equals("XChoice")) {
return null;
}
c = AbilityUtils.calculateAmount(source, cost.getAmount(), ability);
}
List<SpellAbility> chosen = new ArrayList<SpellAbility>();
for (SpellAbilityStackInstance si : source.getGame().getStack()) {
SpellAbility sp = si.getSpellAbility().getRootAbility();
if (si.getSourceCard().isValid(cost.getType().split(";"), source.getController(), source)) {
chosen.add(sp);
}
}
return chosen.isEmpty() ? null : PaymentDecision.spellabilities(chosen);
}