Add EnemyWave and EnemyWavesManager classes; implement enemy spawning system for wave-based gameplay

Assets/Scripts/Systems/EnemyWavesManager.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Data;
+using KBCore.Refs;
+using Sirenix.OdinInspector;
+using Sirenix.Serialization;
+using UnityEngine;
+using Random = UnityEngine.Random;
+
+namespace Systems
+{
+    public class EnemyWavesManager : MonoBehaviour
+    {
+        [OdinSerialize, ListDrawerSettings(NumberOfItemsPerPage = 20), SerializeField]
+        private List<EnemyWave> waves = new();
+        
+        [OdinSerialize, SerializeField] private Transform[] spawnPoints;
+        
+        private Coroutine spawnCoroutine;
+        private List<GameObject> aliveEnemies = new();
+        [Self, SerializeField] private GameManager gameManager;
+
+        private void OnEnable()
+        {
+            gameManager.OnRoundStart += StartWave;
+            gameManager.OnRoundEnd += EndWave;
+        }
+
+        private void OnDisable()
+        {
+            gameManager.OnRoundStart -= StartWave;
+            gameManager.OnRoundEnd -= EndWave;
+        }
+
+        private void StartWave(int round)
+        {
+            if (spawnCoroutine != null) StopCoroutine(spawnCoroutine);
+            if (round - 1 < waves.Count) spawnCoroutine = StartCoroutine(SpawnWave(waves[round - 1]));
+        }
+
+        private void EndWave(int round)
+        {
+            foreach (var enemy in aliveEnemies)
+            {
+                if (!enemy) continue;
+                Destroy(enemy);
+            }
+            
+            aliveEnemies.Clear();
+            if (spawnCoroutine != null) StopCoroutine(spawnCoroutine);
+        }
+
+        private IEnumerator SpawnWave(EnemyWave wave)
+        {
+            foreach (var spawn in wave.spawns)
+            {
+                for (var i = 0; i < spawn.count; i++)
+                {
+                    var spawnPoint = spawnPoints[Random.Range(0, spawnPoints.Length)];
+                    var enemy = Instantiate(spawn.enemyPrefab, spawnPoint.position, Quaternion.identity);
+                    aliveEnemies.Add(enemy);
+                    yield return new WaitForSeconds(spawn.spawnInterval);
+                }
+            }
+        }
+    }
+}