fix: add more checks, fix power stone check and usestone not having a target entity field

src/main/java/uulm/teamname/marvelous/gamelibrary/gamelogic/GameLogic.java

@@ -136,9 +136,13 @@ public class GameLogic {
                             }
                         }
                         case MindStone -> {
+                            verifyCoordinates(state, data.targetField);
+
                             requireLineOfSight(state, data.originField, data.targetField);
                         }
                         case RealityStone -> {
+                            verifyCoordinates(state, data.targetField);
+
                             boolean rock = false;
                             boolean empty = true;
                             for(Entity entity: state.entities.findByPosition(data.targetField)) {
@@ -154,16 +158,28 @@ public class GameLogic {
                             }
                         }
                         case PowerStone -> {
-                            Character target = getCharacter(state, data.targetField, data.targetEntity);
+                            verifyCoordinates(state, data.targetField);
 
-                            requireAlive(target);
+                            Entity target = getAttackableWithoutID(state, data.targetField);
-                            requireOppositeTeam(origin, target);
+
+                            if(target instanceof Character) {
+                                Character targetCharacter = (Character)target;
+
+                                requireOppositeTeam(origin, targetCharacter);
+                                requireAlive(targetCharacter);
+                            }
+
+                            if(data.originField.distanceChebyshev(data.targetField) != 1) {
+                                throw new InvalidRequestException("Invalid melee target distance");
+                            }
                         }
                         case TimeStone -> {
                             // "👍  i approve" - the server
                         }
                         case SoulStone -> {
-                            Character target = getCharacter(state, data.targetField, data.targetEntity);
+                            verifyCoordinates(state, data.targetField);
+
+                            Character target = getCharacterWithoutID(state, data.targetField);
 
                             if(data.originEntity.equals(data.targetEntity)) {
                                 throw new InvalidRequestException("Invalid soul stone target (same as origin)");
@@ -211,6 +227,21 @@ public class GameLogic {
         return entity;
     }
 
+    /**
+     * Retrieves an attack-able Entity ({@link Character} or {@link Rock}) for a {@link Request}.
+     * @param state The game state to use
+     * @param position The requested position
+     * @return The found entity
+     * @throws InvalidRequestException if the entity is invalid or not found
+     */
+    private static Entity getAttackableWithoutID(GameState state, IntVector2 position) throws InvalidRequestException {
+        ArrayList<Entity> entities = state.entities.findByPosition(position);
+        if(entities.isEmpty() || entities.get(0).id.type == EntityType.NPC) {
+            throw new InvalidRequestException("Invalid target character or rock");
+        }
+        return entities.get(0);
+    }
+
     /**
      * Retrieves a {@link Character} for a {@link Request}.
      * @param state The game state to use
@@ -231,6 +262,25 @@ public class GameLogic {
         }
     }
 
+    /**
+     * Retrieves a {@link Character} for a {@link Request}.
+     * @param state The game state to use
+     * @param position The requested position
+     * @return The found character
+     * @throws InvalidRequestException if the character is invalid or not found
+     */
+    private static Character getCharacterWithoutID(GameState state, IntVector2 position) throws InvalidRequestException {
+        ArrayList<Entity> entities = state.entities.findByPosition(position);
+        if(entities.isEmpty() || !(entities.get(0) instanceof Character) || entities.get(0).id.type == EntityType.NPC) {
+            throw new InvalidRequestException("Invalid origin or target character");
+        }
+        try {
+            return (Character)entities.get(0);
+        }catch(Exception ignored) {
+            throw new InvalidRequestException("Invalid origin or target character (cast failed)");
+        }
+    }
+
     /**
      * Verifies that a {@link Character} has a turn.
      */