Refactor stackable items codebase

src/main/java/com/bartlomiejpluta/demo/entity/Player.java

@@ -55,6 +55,42 @@ public class Player extends Creature {
    }
 
    public boolean pushItemToEquipment(@NonNull Item item) {
+      if (item instanceof Ammunition ammo) {
+         if (ammo.getId().equals(getAmmunition().getId())) {
+            getAmmunition().increase(ammo.getCount());
+            return true;
+         }
+      }
+
+      if (item instanceof ItemStack stack) {
+         return pushItemStackToEquipment(stack);
+      }
+
+      return pushSingleItemToEquipment(item);
+   }
+
+   private boolean pushItemStackToEquipment(@NonNull ItemStack items) {
+      var availableSlot = -1;
+      for (int i = 0; i < equipment.length; ++i) {
+         if (equipment[i] instanceof ItemStack stack && stack.getId().equals(items.getId())) {
+            stack.increase(items.getCount());
+            return true;
+         }
+
+         if (availableSlot == -1 && equipment[i] == null) {
+            availableSlot = i;
+         }
+      }
+
+      if (availableSlot > -1) {
+         equipment[availableSlot] = items;
+         return true;
+      }
+
+      return false;
+   }
+
+   private boolean pushSingleItemToEquipment(@NonNull Item item) {
       for (int i = 0; i < equipment.length; ++i) {
          if (equipment[i] == null) {
             equipment[i] = item;

src/main/java/com/bartlomiejpluta/demo/world/item/ItemStack.java

@@ -1,6 +1,8 @@
 package com.bartlomiejpluta.demo.world.item;
 
 public interface ItemStack extends Item {
+   String getId();
+
    int getCount();
 
    void setCount(int count);

src/main/java/com/bartlomiejpluta/demo/world/item/UseableStackableItem.java

@@ -0,0 +1,18 @@
+package com.bartlomiejpluta.demo.world.item;
+
+import com.bartlomiejpluta.demo.entity.Creature;
+import lombok.NonNull;
+
+public abstract class UseableStackableItem extends StackableItem implements Useable {
+
+   protected UseableStackableItem(@NonNull String id, int count) {
+      super(id, count);
+   }
+
+   @Override
+   public void use(Creature creature) {
+      if (--count == 0) {
+         creature.removeItemFromEquipment(this);
+      }
+   }
+}

src/main/java/com/bartlomiejpluta/demo/world/potion/Medicament.java

@@ -3,12 +3,16 @@ package com.bartlomiejpluta.demo.world.potion;
 import DB.dao;
 import com.bartlomiejpluta.base.util.random.DiceRoller;
 import com.bartlomiejpluta.demo.entity.Creature;
-import com.bartlomiejpluta.demo.world.item.StackableItem;
 import com.bartlomiejpluta.demo.world.item.Useable;
+import com.bartlomiejpluta.demo.world.item.UseableStackableItem;
 import lombok.Getter;
 import lombok.NonNull;
 
-public class Medicament extends StackableItem implements Useable {
+import static java.lang.String.format;
+
+public class Medicament extends UseableStackableItem implements Useable {
+   @Getter
+   private final String id;
 
    @Getter
    private final String name;
@@ -24,14 +28,12 @@ public class Medicament extends StackableItem implements Useable {
       super(template.getIcon(), count);
       this.name = template.getName();
       this.roller = DiceRoller.of(template.getHp());
+      this.id = format("med:%s", template.getId());
    }
 
    @Override
    public void use(Creature creature) {
-      if(--count == 0) {
-         creature.removeItemFromEquipment(this);
-      }
-
+      super.use(creature);
       creature.heal(roller.roll());
    }
 }

src/main/java/com/bartlomiejpluta/demo/world/weapon/Ammunition.java

@@ -7,6 +7,8 @@ import lombok.Getter;
 import lombok.NonNull;
 import lombok.ToString;
 
+import static java.lang.String.format;
+
 @ToString
 public class Ammunition extends StackableItem implements Useable {
 
@@ -26,7 +28,7 @@ public class Ammunition extends StackableItem implements Useable {
    public Ammunition(@NonNull DB.model.AmmunitionModel template, int count) {
       super(template.getIcon(), count);
 
-      this.id = template.getId();
+      this.id = format("ammo:%s", template.getId());
       this.name = template.getName();
       this.appliesTo = template.getAppliesTo();
    }