fix upgrades

Assets/Scripts/Entities/Enemy/Enemy.cs

@@ -12,6 +12,7 @@ public class Enemy : Entity
         public EnemyAbility ability;
         public float currentCooldown;
     }
+    public static event Action OnDamaged;
     [Header("Targetting")]
     public Entity closestTarget;
     public float engagementRange;
@@ -112,6 +113,12 @@ public class Enemy : Entity
         }
     }
 
+    public override void TakeDamage(float damage)
+    {
+        base.TakeDamage(damage);
+        OnDamaged?.Invoke();
+    }
+
     protected virtual void DropUpgrade(UpgradeDrop drop)
     {
         float random = Random.Range(0, 100);

Assets/Scripts/Entities/Enemy/EnemySpawner.cs

@@ -29,10 +29,14 @@ public class EnemySpawner : MonoBehaviour
     [SerializeField] private float currentSpawnTime;
     [Header("Boss")]
     public Enemy bossEnemy;
+    private Enemy bossEnemyInstance;
     public Transform bossSpawnPoint;
+    [SerializeField] private GameObject bossUI;
+    [SerializeField] private Transform bossHealthBar;
     [Header("Cache")]
     [SerializeField] private Transform enemyFolder;
     [SerializeField] private Marisa player;
+
     private void Update()
     {
         if (canSpawn)
@@ -46,16 +50,24 @@ public class EnemySpawner : MonoBehaviour
         }
     }
 
-    public void SpawnEnemy(Enemy enemy, Vector3 location)
+    public Enemy SpawnEnemy(Enemy enemy, Vector3 location)
     {
         Enemy newEnemy = Instantiate(enemy, location, Quaternion.identity);
         newEnemy.transform.SetParent(enemyFolder);
         newEnemy.closestTarget = player; //idk if there's actually gonna be any other target lol
+        return newEnemy;
     }
 
     public void StartBoss()
     {
-        SpawnEnemy(bossEnemy, bossSpawnPoint.position);
+        bossEnemyInstance = SpawnEnemy(bossEnemy, bossSpawnPoint.position);
+        bossUI.SetActive(true);
         canSpawn = false;
+        Enemy.OnDamaged += UpdateBossHealthBar; //this kinda sucks but it technically works??
+    }
+
+    private void UpdateBossHealthBar()
+    {
+        bossHealthBar.localScale = new Vector3(Math.Clamp(bossEnemyInstance.health / bossEnemyInstance.maxHealth, 0, bossEnemyInstance.maxHealth), 1, 1);
     }
 }

Assets/Scripts/Entities/Entity.cs

@@ -1,3 +1,4 @@
+using System;
 using UnityEngine;
 
 public class Entity : MonoBehaviour
@@ -11,6 +12,7 @@ public class Entity : MonoBehaviour
     [Header("Stats")]
     public float health;
     public float maxHealth;
+
     [Header("Movement")] 
     [SerializeField] private bool isFacingRight;
     [SerializeField] protected Rigidbody2D rb;
@@ -37,7 +39,7 @@ public class Entity : MonoBehaviour
             rb.linearVelocity = moveDirection * speed;
         }
     }
-    public void TakeDamage(float damage)
+    public virtual void TakeDamage(float damage)
     {
         health -= damage;
         if (health < 0)

Assets/Scripts/Entities/Marisa.cs

@@ -9,6 +9,8 @@ public class Marisa : Entity
     public Vector2 mouseWorldPos;
     public Transform firingPointBase;
     public Transform firingPoint;
+    [Header("UI")]
+    [SerializeField] private Transform hpBarUI;
     private void Update()
     {
         mouseWorldPos = cam.ScreenToWorldPoint(Input.mousePosition);
@@ -20,4 +22,15 @@ public class Marisa : Entity
         moveDirection = new Vector2(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"));
         base.FixedUpdate();
     }
+
+    public override void TakeDamage(float damage)
+    {
+        base.TakeDamage(damage);
+        UpdateHealthUI();
+    }
+
+    private void UpdateHealthUI()
+    {
+        hpBarUI.localScale = new Vector3(Math.Clamp(health/maxHealth,0,maxHealth), 1,1);
+    }
 }