Initial pass on wave spawning.

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Assets/Scripts/Enemy.cs

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+using UnityEngine;
+
+namespace DefaultNamespace
+{
+    // TODO (Michael): Empty behavior until we decide more on how enemies should be structured. Mainly being used for 
+    // other systems to have something to reference.
+    public class Enemy : MonoBehaviour
+    {
+        
+    }
+}

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Assets/Scripts/EnemyRuntimeSetSO.cs

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+using UnityEngine;
+
+namespace DefaultNamespace
+{
+    [CreateAssetMenu(menuName = "Enemy Runtime Set", fileName =
+        "EnemyRuntimeSet")]
+    public class EnemyRuntimeSetSO : RuntimeSetSO<Enemy>
+    {
+        
+    }
+}

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Assets/Scripts/Events/SpawnWaveSOEventChannelSO.cs

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+using UnityEngine;
+using UnityEngine.Events;
+using Wave;
+
+namespace Events
+{
+    [CreateAssetMenu(menuName = "Events/Spawn Wave SO Event Channel")]
+    public class SpawnWaveSOEventChannelSO : ScriptableObject
+    {
+        public event UnityAction<SpawnWaveSO> OnEventRaised;
+
+        public void RaiseEvent(SpawnWaveSO spawnWave)
+        {
+            OnEventRaised?.Invoke(spawnWave);
+        }
+    }
+}

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Assets/Scripts/Level/LevelDirector.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using Wave;
+
+namespace Level
+{
+    public class LevelDirector : MonoBehaviour
+    {
+        [SerializeField] private WaveSpawner waveSpawner;
+        [SerializeField] private List<SpawnWaveSO> spawnWaves;
+
+        private void Start()
+        {
+            waveSpawner.Begin(spawnWaves);
+        }
+    }
+}

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Assets/Scripts/RuntimeSetSO.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+public abstract class RuntimeSetSO<T> : ScriptableObject
+{
+    [HideInInspector] [SerializeField] private List<T> items = new();
+    
+    public IReadOnlyCollection<T> Items => items;
+    public bool IsEmpty => items.Count == 0;
+    
+    public void Add(T thing)
+    {
+        if (!items.Contains(thing))
+        {
+            items.Add(thing);
+        }
+    }
+    
+    public void Remove(T thing)
+    {
+        if (items.Contains(thing))
+        {
+            items.Remove(thing);
+        }
+    }
+}

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Assets/Scripts/Wave/SpawnDistribution.cs

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+namespace Wave
+{
+    public enum SpawnDistribution
+    {
+        Uniform,
+        Random,
+        DiskRandom
+    }
+}

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Assets/Scripts/Wave/SpawnPackSO.cs

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+using System.Collections.Generic;
+using DefaultNamespace;
+using UnityEngine;
+using UnityEngine.Assertions;
+
+namespace Wave
+{
+    [CreateAssetMenu(fileName = "SpawnPack", menuName = "Spawn/Pack", order = 0)]
+    public class SpawnPackSO : ScriptableObject
+    {
+        [SerializeField] private List<Enemy> possibleEnemies;
+        [SerializeField] [Min(0)] private int minCount;
+        [SerializeField] [Min(0)] private int maxCount;
+        
+        public IReadOnlyCollection<Enemy> EnemiesToSpawn()
+        {
+            Assert.IsTrue(possibleEnemies.Count > 0);
+            
+            var count = Random.Range(minCount, maxCount);
+            var enemiesToSpawn = new List<Enemy>();
+            
+            for (var i = 0; i < count; i++)
+            {
+                var enemyIndex = Random.Range(0, possibleEnemies.Count);
+                enemiesToSpawn.Add(possibleEnemies[enemyIndex]);
+            }
+
+            return enemiesToSpawn;
+        }
+    }
+}

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Assets/Scripts/Wave/SpawnWaveSO.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Serialization;
+
+namespace Wave
+{
+    [CreateAssetMenu(fileName = "SpawnWave", menuName = "Spawn Wave", order = 0)]
+    public class SpawnWaveSO : ScriptableObject
+    {
+        [SerializeField] private List<SpawnPackSO> packs;
+        [SerializeField] private SpawnDistribution distribution;
+        [SerializeField] [Min(10)] private float radius;
+        [SerializeField] [Min(0)] private float packRadius;
+        [SerializeField] [Min(0)] private float timeBetweenSpawns;
+        [SerializeField] [Min(0)] private float timeBetweenPacks;
+        [SerializeField] [Min(0)] private float timeToComplete;
+        
+        
+        public IReadOnlyCollection<SpawnPackSO> Packs => packs;
+        public SpawnDistribution Distribution => distribution;
+        public float Radius => radius;
+        public float PackRadius => packRadius;
+        public float TimeBetweenSpawns => timeBetweenSpawns;
+        public float TimeBetweenPacks => timeBetweenPacks;
+        public float TimeToComplete => timeToComplete;
+    }
+}

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Assets/Scripts/Wave/WaveSpawner.cs

@@ -0,0 +1,129 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using DefaultNamespace;
+using Events;
+using UnityEngine;
+using UnityEngine.Assertions;
+using Random = UnityEngine.Random;
+
+namespace Wave
+{
+    public class WaveSpawner : MonoBehaviour
+    {
+        [SerializeField] private SpawnWaveSOEventChannelSO startNewSpawnWaveEventChannel;
+        [SerializeField] private SpawnWaveSOEventChannelSO endSpawnWaveEventChannel;
+
+        [SerializeField] private EnemyRuntimeSetSO enemyRuntimeSet;
+        [SerializeField] private Transform spawnCenter;
+        [SerializeField] private float minimumSpawnRadius;
+        [SerializeField] [Min(0)] private float timeBetweenClearedWaves;
+        [SerializeField] [Min(0)] private float timeBeforeFirstWave;
+
+        private float _timeSinceLastSpawnWaveStarted;
+        private Coroutine _handleSpawnWaves;
+
+        private bool HasWaveBeenCleared => enemyRuntimeSet.IsEmpty;
+
+        public void Begin(IEnumerable<SpawnWaveSO> spawnWaves)
+        {
+            Assert.IsNull(_handleSpawnWaves);
+            _handleSpawnWaves = StartCoroutine(CO_HandleSpawnWaves(spawnWaves));
+        }
+
+        public void End()
+        {
+            StopCoroutine(_handleSpawnWaves);
+        }
+
+        private IEnumerator CO_HandleSpawnWaves(IEnumerable<SpawnWaveSO> spawnWaves)
+        {
+            yield return new WaitForSeconds(timeBeforeFirstWave);
+
+            foreach (var spawnWave in spawnWaves)
+            {
+                startNewSpawnWaveEventChannel.RaiseEvent(spawnWave);
+                yield return SpawnWave(spawnWave);
+                _timeSinceLastSpawnWaveStarted = 0.0f;
+
+                yield return new WaitUntil(() =>
+                    _timeSinceLastSpawnWaveStarted >= spawnWave.TimeToComplete
+                    || HasWaveBeenCleared);
+
+                endSpawnWaveEventChannel.RaiseEvent(spawnWave);
+                yield return new WaitForSeconds(timeBetweenClearedWaves);
+            }
+        }
+
+        private IEnumerator SpawnWave(SpawnWaveSO spawnWave)
+        {
+            var enemyPacksToSpawn = spawnWave.Packs.Select(pack => pack.EnemiesToSpawn()).ToList().AsReadOnly();
+            var totalPacksToSpawn = enemyPacksToSpawn.Count;
+            
+
+            var numberPacksSpawned = 0;
+            foreach (var enemyPackToSpawn in enemyPacksToSpawn)
+            {
+                numberPacksSpawned++;
+                var waveCompletionPercentage = (float) numberPacksSpawned / (float) totalPacksToSpawn;
+
+                // TODO (Michael): Both the pack and enemy position samplers need to be a bit smarter. I think in most scenarios the pack circle just needs to not overlap with other pack circles. 
+                // The enemy spawns probably need something like a poission disk sampler so that monsters dont overlap. The enemy spawn radius at the pack's position should also probably scale with the size of the pack.
+                var enemyPackSpawnCenter = CalculatePackSpawnPosition(waveCompletionPercentage, spawnWave);
+                
+                foreach (var enemy in enemyPackToSpawn)
+                {
+
+                    var spawnLocation = CalculateEnemySpawnPosition(enemyPackSpawnCenter, spawnWave.PackRadius);
+                    var spawnedEnemy = Instantiate(enemy, spawnLocation, Quaternion.identity);
+                    enemyRuntimeSet.Add(spawnedEnemy);
+                    
+                    if (spawnWave.TimeBetweenSpawns > 0.0f)
+                    {
+                        yield return new WaitForSeconds(spawnWave.TimeBetweenSpawns);
+                    }
+                }
+                
+                if (spawnWave.TimeBetweenPacks > 0.0f)
+                {
+                    yield return new WaitForSeconds(spawnWave.TimeBetweenPacks);
+                }
+            }
+        }
+
+        private Vector3 CalculatePackSpawnPosition(float waveCompletionPercentage, SpawnWaveSO spawnWave)
+        {
+            var angle = waveCompletionPercentage * 2 * MathF.PI;
+            var unitCirclePosition = Random.insideUnitCircle;
+            var swizzledUnitCirclePosition = new Vector3(unitCirclePosition.x, 0, unitCirclePosition.y);
+            
+            var spawnOffset = spawnWave.Distribution switch
+            {
+                SpawnDistribution.Uniform => new Vector3(Mathf.Cos(angle), 0, Mathf.Sin(angle)) * spawnWave.Radius,
+                SpawnDistribution.Random => swizzledUnitCirclePosition.normalized *  spawnWave.Radius,
+                SpawnDistribution.DiskRandom => swizzledUnitCirclePosition *  spawnWave.Radius,
+                _ => throw new ArgumentOutOfRangeException(nameof(spawnWave.Distribution), spawnWave.Distribution, null)
+            };
+            
+            spawnOffset += spawnOffset.normalized * (minimumSpawnRadius + spawnWave.PackRadius);
+
+            return spawnCenter.position + spawnOffset;
+        }
+
+        private Vector3 CalculateEnemySpawnPosition(Vector3 center, float radius)
+        {
+            var unitCirclePosition = Random.insideUnitCircle;
+            var swizzledUnitCirclePosition = new Vector3(unitCirclePosition.x, 0, unitCirclePosition.y);
+
+            var spawnOffset = swizzledUnitCirclePosition * radius;
+
+            return center + spawnOffset;
+        }
+        
+        private void Update()
+        {
+            _timeSinceLastSpawnWaveStarted += Time.deltaTime;
+        }
+    }
+}

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