randomize delay between zombie spawns

Assets/Scripts/ZombieSpawnerLogic.cs

@@ -4,15 +4,18 @@ using UnityEngine;
 public class ZombieSpawnerLogic : MonoBehaviour
 {
     public GameObject Prefab;
-    public byte CooldownSeconds = 5;
+    public byte MinCooldownSeconds = 5;
+    public byte MaxCooldownSeconds = 30;
     public byte MaxSpawns = 5;
 
+    private float _currentSpawnDelay;
     private float _lastSpawn;
     private readonly List<GameObject> _spawns = new();
 
     void Start()
     {
         _lastSpawn = Time.time;
+        PickNewSpawnDelay();
     }
 
     void FixedUpdate()
@@ -21,9 +24,15 @@ public class ZombieSpawnerLogic : MonoBehaviour
         AttemptZombieSpawn();
     }
 
+    private void PickNewSpawnDelay()
+    {
+        _currentSpawnDelay = Random.Range(MinCooldownSeconds, MaxCooldownSeconds);
+        Debug.Log($"Zombie spawner new spawn delay: {_currentSpawnDelay}s");
+    }
+
     private void AttemptZombieSpawn()
     {
-        if (Time.time - _lastSpawn < CooldownSeconds)
+        if (Time.time - _lastSpawn < _currentSpawnDelay)
         {
             return;
         }
@@ -38,6 +47,7 @@ public class ZombieSpawnerLogic : MonoBehaviour
         var newZombie = Instantiate(Prefab, transform);
         _spawns.Add(newZombie);
         _lastSpawn = Time.time;
+        PickNewSpawnDelay();
     }
 
     private void RemoveDestroyedZombies() => _spawns.RemoveAll(zombie => zombie == null);