/**
* Filters out cost modification effects that are not active.
*
* @param game
* @return
*/
private List<CostModificationEffect> getApplicableCostModificationEffects(Game game) {
List<CostModificationEffect> costEffects = new ArrayList<>();
for (CostModificationEffect effect : costModificationEffects) {
HashSet<Ability> abilities = costModificationEffects.getAbility(effect.getId());
for (Ability ability : abilities) {
if (!(ability instanceof StaticAbility) || ability.isInUseableZone(game, null, null)) {
if (effect.getDuration() != Duration.OneUse || !effect.isUsed()) {
costEffects.add(effect);
break;
}
}
}
}
return costEffects;
}
/**
* Inspects all {@link Permanent permanent's} {@link Ability abilities} on the battlefield for
* {@link CostModificationEffect cost modification effects} and applies them if necessary.
*
* @param abilityToModify
* @param game
*/
public void costModification(Ability abilityToModify, Game game) {
List<CostModificationEffect> costEffects = getApplicableCostModificationEffects(game);
for (CostModificationEffect effect : costEffects) {
if (effect.getModificationType() == CostModificationType.INCREASE_COST) {
HashSet<Ability> abilities = costModificationEffects.getAbility(effect.getId());
for (Ability ability : abilities) {
if (effect.applies(abilityToModify, ability, game)) {
effect.apply(game, ability, abilityToModify);
}
}
}
}
for (CostModificationEffect effect : costEffects) {
if (effect.getModificationType() == CostModificationType.REDUCE_COST) {
HashSet<Ability> abilities = costModificationEffects.getAbility(effect.getId());
for (Ability ability : abilities) {
if (effect.applies(abilityToModify, ability, game)) {
effect.apply(game, ability, abilityToModify);
}
}
}
}
for (CostModificationEffect effect : costEffects) {
if (effect.getModificationType() == CostModificationType.SET_COST) {
HashSet<Ability> abilities = costModificationEffects.getAbility(effect.getId());
for (Ability ability : abilities) {
if (effect.applies(abilityToModify, ability, game)) {
effect.apply(game, ability, abilityToModify);
}
}
}
}
}