Merge pull request 'enemies spawn held in place' (#5) from enemies-spawn-held-in-place into main

Reviewed-on: #5

Assets/_Project/Scripts/Gameplay/EnemyHealth.cs

@@ -66,6 +66,7 @@ namespace TD.Gameplay
         private float     pendingMaxHp    = 100f;
         private int       pendingLivesCost = 1;
         private bool      pendingIsFlying;
+        private bool      pendingIsHeld;
         private bool      hasPendingInit;
 
         // ----- Server-local runtime state -------------------------------------
@@ -97,11 +98,17 @@ namespace TD.Gameplay
             NetworkVariableReadPermission.Everyone,
             NetworkVariableWritePermission.Server);
 
+        private readonly NetworkVariable<bool> isHeld = new NetworkVariable<bool>(
+            false,
+            NetworkVariableReadPermission.Everyone,
+            NetworkVariableWritePermission.Server);
+
         // ----- Public state ---------------------------------------------------
 
         public float CurrentHp => hp.Value;
         public float MaxHp     { get; private set; } = 100f;
         public bool  IsDead    => hp.Value <= 0f;
+        public bool  IsHeld    => isHeld.Value;
 
         /// <summary>
         /// True if this enemy flies over tower footprints.
@@ -126,11 +133,12 @@ namespace TD.Gameplay
         /// and before <c>NetworkObject.Spawn()</c>. Mirrors the
         /// <c>TowerInstance.InitializeServer</c> pattern.
         /// </summary>
-        public void InitializeServer(float maxHp, int livesCost, bool flying)
+        public void InitializeServer(float maxHp, int livesCost, bool flying, bool held = false)
         {
             pendingMaxHp      = maxHp;
             pendingLivesCost  = livesCost;
             pendingIsFlying   = flying;
+            pendingIsHeld     = held;
             hasPendingInit    = true;
 
             // Cache locally on the server immediately — clients resolve via NV.
@@ -146,12 +154,19 @@ namespace TD.Gameplay
             {
                 hp.Value       = pendingMaxHp;
                 isFlying.Value = pendingIsFlying;
+                isHeld.Value   = pendingIsHeld;
                 hasPendingInit = false;
             }
 
             // Non-server clients resolve MaxHp from the replicated hp initial value.
             if (!IsServer)
                 MaxHp = hp.Value;
+
+            // Apply initial held state on all peers and watch for future changes.
+            // isHeld.OnValueChanged doesn't fire for the initial replication, so we
+            // apply it explicitly here as well.
+            ApplyHeldState(isHeld.Value);
+            isHeld.OnValueChanged += (_, current) => ApplyHeldState(current);
         }
 
         public override void OnNetworkDespawn()
@@ -166,6 +181,23 @@ namespace TD.Gameplay
 
         // ----- Server API -----------------------------------------------------
 
+        /// <summary>
+        /// Sets whether this enemy is held. Held enemies are untargetable and do not
+        /// move. Server-only; the NetworkVariable replicates the change to all peers.
+        /// </summary>
+        public void SetHeld(bool held)
+        {
+            if (!IsServer) return;
+            isHeld.Value = held;
+        }
+
+        private void ApplyHeldState(bool held)
+        {
+            if (IsDead) return;
+            foreach (var col in GetComponentsInChildren<Collider>())
+                col.enabled = !held;
+        }
+
         /// <summary>
         /// Applies damage to this enemy. Server-only; silently no-ops on clients.
         /// <paramref name="type"/> is accepted for future resistance lookups (Phase 1.5+).

Assets/_Project/Scripts/Gameplay/EnemyMovement.cs

@@ -71,6 +71,7 @@ namespace TD.Gameplay
         // possible if pathing is dynamic).
         private bool              hasLeakedOriginZone;
         private EnemyStatus       status;
+        private EnemyHealth       health;
         private bool              hasReachedGoal;
         private bool              wasStuck;        // dedupes the "no path" warning
 
@@ -119,6 +120,7 @@ namespace TD.Gameplay
         public override void OnNetworkSpawn()
         {
             status = GetComponent<EnemyStatus>();
+            health = GetComponent<EnemyHealth>();
 
             // Randomize the walk-cycle phase on every peer independently. Animations
             // are purely visual and not replicated, so each client picks its own offset —
@@ -172,6 +174,7 @@ namespace TD.Gameplay
         private void Update()
         {
             if (!IsServer) return;
+            if (health != null && health.IsHeld) return;
             if (remainingPath.Count == 0) return;
 
             float effectiveSpeed = moveSpeed * (status != null ? status.GetSpeedMultiplier() : 1f);

Assets/_Project/Scripts/Gameplay/WaveDefinition.cs

@@ -5,8 +5,7 @@ using UnityEngine;
 namespace TD.Gameplay
 {
     /// <summary>
-    /// A single spawn group within a wave: one enemy type, how many of them,
-    /// and how long to wait between each spawn.
+    /// A single spawn group within a wave: one enemy type and how many of them.
     /// </summary>
     [Serializable]
     public struct WaveEntry
@@ -16,10 +15,6 @@ namespace TD.Gameplay
 
         [Tooltip("How many enemies of this type to spawn.")]
         public int Count;
-
-        [Tooltip("Seconds between each burst. Enemies spawn in bursts of 10% of Count at a time.")]
-        public float SpawnInterval;
-
     }
 
     /// <summary>
@@ -29,16 +24,21 @@ namespace TD.Gameplay
     /// <remarks>
     /// Entries are processed in array order. Multiple entries let designers mix enemy
     /// types within one wave (e.g. 10 fast scouts followed by 3 armoured brutes).
-    /// The wave is not considered complete until all spawned enemies are dead or have
-    /// leaked — not just until all entries are spawned.
+    /// All enemies spawn held at wave start; they are released in 10% chunks separated
+    /// by <see cref="ReleaseInterval"/> seconds. The wave is not complete until all
+    /// enemies are dead or have leaked.
     /// </remarks>
     [CreateAssetMenu(fileName = "WaveDefinition", menuName = "TD/Wave Definition", order = 4)]
     public class WaveDefinition : ScriptableObject
     {
         [Tooltip("Seconds between the wave-number advancing (start of prep) and the " +
-                 "first enemy spawning. Gives players time to build before the wave hits.")]
+                 "first enemies becoming visible. Gives players time to build before the horde appears.")]
         public float PrepTime = 10f;
 
+        [Tooltip("Seconds between each chunk release. All enemies spawn held at wave " +
+                 "start and are released 10% at a time on this interval.")]
+        public float ReleaseInterval = 2f;
+
         [Tooltip("Enemy groups that make up this wave. Processed in order.")]
         public WaveEntry[] Entries;
     }

Assets/_Project/Scripts/Gameplay/WaveManager.cs

@@ -100,6 +100,9 @@ namespace TD.Gameplay
         private int       currentWaveIndex = -1;  // -1 = not yet started
         private Coroutine activeWaveCoroutine;
 
+        private readonly System.Collections.Generic.List<EnemyHealth> heldEnemies
+            = new System.Collections.Generic.List<EnemyHealth>();
+
         // ----- NGO lifecycle ----------------------------------------------
 
         public override void OnNetworkSpawn()
@@ -314,6 +317,7 @@ namespace TD.Gameplay
             // skipping the prep timer so spawning starts immediately.
             activeEnemyCount = 0;
             spawningComplete = false;
+            heldEnemies.Clear();
             StartNextWave(skipPrep: true);
         }
 
@@ -349,26 +353,35 @@ namespace TD.Gameplay
             // whether prep was skipped or just expired.
             prepCountdown.Value = 0f;
 
-            // Spawn phase.
+            // Spawn all enemies at once in a held (untargetable, immobile) state.
             if (def.Entries != null)
             {
                 foreach (var entry in def.Entries)
                 {
                     if (entry.EnemyType == null || entry.Count <= 0) continue;
-
-                    int chunkSize = Mathf.Max(1, Mathf.RoundToInt(entry.Count * 0.1f));
-                    for (int i = 0; i < entry.Count; i += chunkSize)
-                    {
-                        int burst = Mathf.Min(chunkSize, entry.Count - i);
-                        for (int j = 0; j < burst; j++)
-                            SpawnEnemyInAllZones(entry.EnemyType);
-
-                        if (entry.SpawnInterval > 0f)
-                            yield return new WaitForSeconds(entry.SpawnInterval);
-                    }
+                    for (int i = 0; i < entry.Count; i++)
+                        SpawnEnemyInAllZones(entry.EnemyType, held: true);
                 }
             }
 
+            // Release in chunks of 10% of the total held count.
+            int total     = heldEnemies.Count;
+            int chunkSize = Mathf.Max(1, Mathf.RoundToInt(total * 0.1f));
+            while (heldEnemies.Count > 0)
+            {
+                int burst = Mathf.Min(chunkSize, heldEnemies.Count);
+                for (int i = 0; i < burst; i++)
+                {
+                    var h = heldEnemies[0];
+                    heldEnemies.RemoveAt(0);
+                    if (h != null && !h.IsDead)
+                        h.SetHeld(false);
+                }
+
+                if (heldEnemies.Count > 0)
+                    yield return new WaitForSeconds(def.ReleaseInterval);
+            }
+
             spawningComplete = true;
 
             // If every spawned enemy was already resolved before this coroutine finished
@@ -378,7 +391,7 @@ namespace TD.Gameplay
 
         // ----- Spawn helpers ----------------------------------------------
 
-        private void SpawnEnemyInAllZones(EnemyDefinition def)
+        private void SpawnEnemyInAllZones(EnemyDefinition def, bool held = false)
         {
             var loader = LevelLoader.Instance;
             if (loader?.LevelData?.PlayerZones == null) return;
@@ -401,7 +414,7 @@ namespace TD.Gameplay
                 // PlayerZoneVolume (so OwnerGrid[spawnerTile] = None).
                 var spawner = zone.Spawners[0];
                 (float xHalf, float zHalf) = ComputeSpawnerHalfExtents(spawner.TileArea);
-                SpawnEnemy(def, spawner.TilePosition, zone.Owner, xHalf, zHalf);
+                SpawnEnemy(def, spawner.TilePosition, zone.Owner, xHalf, zHalf, held);
             }
         }
 
@@ -427,7 +440,7 @@ namespace TD.Gameplay
         }
 
         private void SpawnEnemy(EnemyDefinition def, Vector2Int spawnerTile, PlayerSlot ownerSlot,
-                                float xHalfExtent = 0f, float zHalfExtent = 0f)
+                                float xHalfExtent = 0f, float zHalfExtent = 0f, bool held = false)
         {
             if (def.EnemyPrefab == null)
             {
@@ -454,8 +467,9 @@ namespace TD.Gameplay
                 return;
             }
 
-            health.InitializeServer(def.MaxHp, def.LivesCost, def.IsFlying);
+            health.InitializeServer(def.MaxHp, def.LivesCost, def.IsFlying, held);
             movement.InitializeServer(def.MoveSpeed, spawnerTile, ownerSlot);
+            if (held) heldEnemies.Add(health);
 
             health.OnDied         += HandleEnemyKilled;
             movement.OnZoneLeaked += HandleZoneLeak;