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Assets/FPS/Scripts/AI/EnemyManager.cs

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+using System.Collections.Generic;
+using Unity.FPS.Game;
+using UnityEngine;
+
+namespace Unity.FPS.AI
+{
+    public class EnemyManager : MonoBehaviour
+    {
+        public List<EnemyController> Enemies { get; private set; }
+        public int NumberOfEnemiesTotal { get; private set; }
+        public int NumberOfEnemiesRemaining => Enemies.Count;
+
+        void Awake()
+        {
+            Enemies = new List<EnemyController>();
+        }
+
+        public void RegisterEnemy(EnemyController enemy)
+        {
+            Enemies.Add(enemy);
+
+            NumberOfEnemiesTotal++;
+        }
+
+        public void UnregisterEnemy(EnemyController enemyKilled)
+        {
+            int enemiesRemainingNotification = NumberOfEnemiesRemaining - 1;
+
+            EnemyKillEvent evt = Events.EnemyKillEvent;
+            evt.Enemy = enemyKilled.gameObject;
+            evt.RemainingEnemyCount = enemiesRemainingNotification;
+            EventManager.Broadcast(evt);
+
+            // removes the enemy from the list, so that we can keep track of how many are left on the map
+            Enemies.Remove(enemyKilled);
+        }
+    }
+}