Health bar and player management refined

Assets/Scripts/HealthBarManager.cs

@@ -0,0 +1,56 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+public class HealthBarManager : MonoBehaviour
+{
+    public GameObject healthBarPrefab;
+    private Dictionary<GameObject, GameObject> playerHealthBars = new Dictionary<GameObject, GameObject>();
+
+    void Start()
+    {
+        GameManager.Instance.StartGameEvent += OnGameStart;
+        GameManager.Instance.EndGameEvent += OnGameEnd;
+    }
+
+    void OnDestroy()
+    {
+        GameManager.Instance.StartGameEvent -= OnGameStart;
+        GameManager.Instance.EndGameEvent -= OnGameEnd;
+    }
+
+    void Update()
+    {
+        foreach (var kvp in playerHealthBars)
+        {
+            GameObject player = kvp.Key;
+            GameObject healthBar = kvp.Value;
+            Vector3 screenPosition = Camera.main.WorldToScreenPoint(player.transform.position);
+            screenPosition.y += 15;
+            Vector3 worldPosition = Camera.main.ScreenToWorldPoint(screenPosition);
+            healthBar.transform.position = worldPosition;
+            healthBar.transform.rotation = Quaternion.identity;
+        }
+    }
+
+    private void OnGameStart()
+    {
+        foreach (GameObject player in GameManager.players)
+        {
+            if (!playerHealthBars.ContainsKey(player))
+            {
+                GameObject healthBar = Instantiate(healthBarPrefab);
+                healthBar.GetComponent<TerribleHealthBarScript>().SetPlayer(player);
+                playerHealthBars[player] = healthBar;
+            }
+        }
+    }
+
+    private void OnGameEnd()
+    {
+        foreach (var kvp in playerHealthBars)
+        {
+            Destroy(kvp.Value);
+        }
+        playerHealthBars.Clear();
+    }
+}