Create AI scaffolding

api/src/main/java/com/bartlomiejpluta/base/api/game/ai/AI.java

@@ -0,0 +1,8 @@
+package com.bartlomiejpluta.base.api.game.ai;
+
+import com.bartlomiejpluta.base.api.game.map.layer.object.ObjectLayer;
+
+@FunctionalInterface
+public interface AI {
+   void nextActivity(ObjectLayer layer, float dt);
+}

api/src/main/java/com/bartlomiejpluta/base/api/game/ai/NPC.java

@@ -0,0 +1,7 @@
+package com.bartlomiejpluta.base.api.game.ai;
+
+import com.bartlomiejpluta.base.api.game.entity.Entity;
+
+public interface NPC extends Entity {
+   AI getStrategy();
+}

api/src/main/java/com/bartlomiejpluta/base/api/game/ai/RandomMovementAI.java

@@ -0,0 +1,34 @@
+package com.bartlomiejpluta.base.api.game.ai;
+
+import com.bartlomiejpluta.base.api.game.entity.Direction;
+import com.bartlomiejpluta.base.api.game.map.layer.object.ObjectLayer;
+
+import java.util.Random;
+
+public class RandomMovementAI implements AI {
+   private final Random random = new Random();
+   private final NPC npc;
+
+   private final float intervalSeconds;
+   private float accumulator = 0.0f;
+   private float threshold = 0.0f;
+
+   public RandomMovementAI(NPC npc, float intervalSeconds) {
+      this.npc = npc;
+      this.intervalSeconds = intervalSeconds;
+   }
+
+   @Override
+   public void nextActivity(ObjectLayer layer, float dt) {
+      if (!npc.isMoving()) {
+         if (accumulator > threshold) {
+            Direction direction = Direction.values()[random.nextInt(4)];
+            layer.pushMovement(npc.prepareMovement(direction));
+            accumulator = 0.0f;
+            threshold = random.nextFloat() * intervalSeconds;
+         }
+
+         accumulator += dt;
+      }
+   }
+}

api/src/main/java/com/bartlomiejpluta/base/api/game/entity/Entity.java

@@ -36,4 +36,8 @@ public interface Entity extends Placeable, Renderable, Updatable {
    void onAdd(ObjectLayer layer);
 
    void onRemove(ObjectLayer layer);
+
+   boolean isBlocking();
+
+   void setBlocking(boolean blocking);
 }

api/src/main/java/com/bartlomiejpluta/base/api/game/entity/EntityDelegate.java

@@ -171,6 +171,16 @@ public abstract class EntityDelegate implements Entity {
       entity.onRemove(layer);
    }
 
+   @Override
+   public boolean isBlocking() {
+      return entity.isBlocking();
+   }
+
+   @Override
+   public void setBlocking(boolean blocking) {
+      entity.setBlocking(blocking);
+   }
+
    @Override
    public void update(float dt) {
       entity.update(dt);