[CLB] Implemented Agent of the Shadow Thieves

Mage/src/main/java/mage/abilities/common/AttacksOpponentWithMostLifeTriggeredAbility.java

@@ -0,0 +1,61 @@
+package mage.abilities.common;
+
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.Effect;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.players.Player;
+
+import java.util.Objects;
+
+/**
+ * @author TheElk801
+ */
+public class AttacksOpponentWithMostLifeTriggeredAbility extends TriggeredAbilityImpl {
+
+    public AttacksOpponentWithMostLifeTriggeredAbility(Effect effect, boolean optional) {
+        super(Zone.BATTLEFIELD, effect, optional);
+    }
+
+    private AttacksOpponentWithMostLifeTriggeredAbility(final AttacksOpponentWithMostLifeTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.DECLARED_ATTACKERS;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        return game.getCombat().getAttackers().contains(this.getSourceId())
+                && game.getPlayer(game.getCombat().getDefenderId(this.getSourceId())) != null;
+    }
+
+    @Override
+    public boolean checkInterveningIfClause(Game game) {
+        Player defender = game.getPlayer(game.getCombat().getDefenderId(getSourceId()));
+        return defender != null
+                && game
+                .getOpponents(getControllerId())
+                .stream()
+                .map(game::getPlayer)
+                .filter(Objects::nonNull)
+                .mapToInt(Player::getLife)
+                .max()
+                .orElse(Integer.MIN_VALUE)
+                <= defender
+                .getLife();
+    }
+
+    @Override
+    public String getTriggerPhrase() {
+        return "Whenever this creature attacks a player, if no opponent has more life than that player, ";
+    }
+
+    @Override
+    public AttacksOpponentWithMostLifeTriggeredAbility copy() {
+        return new AttacksOpponentWithMostLifeTriggeredAbility(this);
+    }
+}