[TDM] Implement Caustic Exhale

Mage/src/main/java/mage/abilities/costs/common/BeholdDragonCost.java

@@ -0,0 +1,109 @@
+package mage.abilities.costs.common;
+
+import mage.abilities.Ability;
+import mage.abilities.costs.Cost;
+import mage.abilities.costs.CostImpl;
+import mage.cards.Card;
+import mage.cards.CardsImpl;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.filter.FilterCard;
+import mage.filter.FilterPermanent;
+import mage.filter.common.FilterControlledPermanent;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.TargetCard;
+import mage.target.TargetPermanent;
+import mage.target.common.TargetCardInHand;
+
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public class BeholdDragonCost extends CostImpl {
+
+    private static final FilterPermanent filterPermanent = new FilterControlledPermanent(SubType.DRAGON);
+    private static final FilterCard filterCard = new FilterCard("a Dragon card");
+
+    static {
+        filterCard.add(SubType.DRAGON.getPredicate());
+    }
+
+    public BeholdDragonCost() {
+        super();
+        this.text = "behold a Dragon";
+    }
+
+    private BeholdDragonCost(final BeholdDragonCost cost) {
+        super(cost);
+    }
+
+    @Override
+    public BeholdDragonCost copy() {
+        return new BeholdDragonCost(this);
+    }
+
+    @Override
+    public boolean canPay(Ability ability, Ability source, UUID controllerId, Game game) {
+        return Optional
+                .ofNullable(game.getPlayer(controllerId))
+                .map(Player::getHand)
+                .map(cards -> cards.count(filterCard, game) > 0)
+                .orElse(false)
+                || game
+                .getBattlefield()
+                .contains(filterPermanent, controllerId, source, game, 1);
+    }
+
+    @Override
+    public boolean pay(Ability ability, Game game, Ability source, UUID controllerId, boolean noMana, Cost costToPay) {
+        Player player = game.getPlayer(controllerId);
+        if (player == null) {
+            paid = false;
+            return paid;
+        }
+        boolean hasPermanent = game
+                .getBattlefield()
+                .contains(filterPermanent, controllerId, source, game, 1);
+        boolean hasHand = player.getHand().count(filterCard, game) > 0;
+        boolean usePermanent;
+        if (hasPermanent && hasHand) {
+            usePermanent = player.chooseUse(
+                    Outcome.Neutral, "Choose a Dragon you control or reveal one from your hand?",
+                    null, "Choose controlled", "Reveal from hand", source, game);
+        } else if (hasPermanent) {
+            usePermanent = true;
+        } else if (hasHand) {
+            usePermanent = false;
+        } else {
+            paid = false;
+            return paid;
+        }
+        if (usePermanent) {
+            TargetPermanent target = new TargetPermanent(filterPermanent);
+            target.withNotTarget(true);
+            player.choose(Outcome.Neutral, target, source, game);
+            Permanent permanent = game.getPermanent(target.getFirstTarget());
+            if (permanent == null) {
+                paid = false;
+                return paid;
+            }
+            game.informPlayers(player.getLogName() + " chooses to behold " + permanent.getLogName());
+            paid = true;
+            return true;
+        }
+        TargetCard target = new TargetCardInHand(filterCard);
+        player.choose(Outcome.Neutral, player.getHand(), target, source, game);
+        Card card = game.getCard(target.getFirstTarget());
+        if (card == null) {
+            paid = false;
+            return paid;
+        }
+        player.revealCards(source, new CardsImpl(card), game);
+        paid = true;
+        return paid;
+    }
+}