it is done

core/src/mindustry/entities/traits/HealthTrait.java

@@ -0,0 +1,52 @@
+package mindustry.entities.traits;
+
+import arc.math.Mathf;
+
+public interface HealthTrait{
+
+    void health(float health);
+
+    float health();
+
+    float maxHealth();
+
+    boolean isDead();
+
+    void setDead(boolean dead);
+
+    default void onHit(SolidTrait entity){
+    }
+
+    default void onDeath(){
+    }
+
+    default boolean damaged(){
+        return health() < maxHealth() - 0.0001f;
+    }
+
+    default void damage(float amount){
+        health(health() - amount);
+        if(health() <= 0 && !isDead()){
+            onDeath();
+            setDead(true);
+        }
+    }
+
+    default void clampHealth(){
+        health(Mathf.clamp(health(), 0, maxHealth()));
+    }
+
+    default float healthf(){
+        return health() / maxHealth();
+    }
+
+    default void healBy(float amount){
+        health(health() + amount);
+        clampHealth();
+    }
+
+    default void heal(){
+        health(maxHealth());
+        setDead(false);
+    }
+}