Major updates to the HUD and selectable objects

Assets/_Project/Scripts/Gameplay/Builder.cs

@@ -46,7 +46,7 @@ namespace TD.Gameplay
     /// traversal.</para>
     /// </remarks>
     [RequireComponent(typeof(NetworkObject))]
-    public class Builder : NetworkBehaviour, IMinimapEntity
+    public class Builder : NetworkBehaviour, IMinimapEntity, ISelectable
     {
         // ----- Static registry --------------------------------------------
 
@@ -156,6 +156,8 @@ namespace TD.Gameplay
         /// <summary>Maximum jobs allowed in the queue.</summary>
         public int MaxQueueDepth => settings.maxQueueDepth;
 
+        // ----- ISelectable ------------------------------------------------
+
         /// <summary>Display name shown in the HUD portrait. Stub until MatchState provides player names.</summary>
         public string DisplayName
         {
@@ -167,6 +169,15 @@ namespace TD.Gameplay
             }
         }
 
+        public SelectableKind Kind => SelectableKind.Builder;
+
+        public Transform SelectionTransform => transform;
+
+        // Builders are point units; the visible silhouette is roughly 1 unit wide.
+        // 0.6 puts a small visible gap between the silhouette and the ring.
+        // Bump up if BuilderSettings later exposes a width or selection radius.
+        public float SelectionRadius => 0.6f;
+
         /// <summary>True if a tile is currently part of any queued or constructing job.</summary>
         /// <remarks>
         /// Used by <c>TowerPlacementManager</c> to reject placement on tiles already
@@ -232,6 +243,14 @@ namespace TD.Gameplay
                 s_byClientId.Remove(OwnerClientId);
             MinimapEntityRegistry.Deregister(this);
 
+            // Clear local selection if THIS builder was selected. Without this,
+            // SelectionState (and any subscriber holding our reference — HUD,
+            // SelectionVisualizer) keeps pointing at a soon-to-be-destroyed Unity
+            // object and throws MissingReferenceException on the next access.
+            // Local-only state, so safe to touch from any peer.
+            if (SelectionState.Instance != null && SelectionState.Instance.IsSelected(this))
+                SelectionState.Instance.Clear();
+
             // Server-only cleanup: despawn any remaining build-site visuals so they
             // don't leak when a player disconnects mid-construction.
             if (IsServer)
@@ -980,7 +999,30 @@ namespace TD.Gameplay
             jobs.RemoveAt(0);
         }
 
-        // Cancels the job at index i. Used for cancel-all and any future targeted cancel.
+        /// <summary>
+        /// Server-only: cancel the job in this builder's queue whose anchor matches
+        /// <paramref name="targetAnchor"/>. Refunds gold, frees the footprint tiles
+        /// (restoring walkability if the stage was blocking), and despawns the
+        /// build-site visual. Returns true if a matching job was found and
+        /// cancelled. Used by <see cref="BuildSiteVisual.RequestCancelRpc"/> so the
+        /// player can cancel a specific in-progress build from the HUD without
+        /// affecting other queued/constructing builds.
+        /// </summary>
+        public bool ServerCancelJobAtAnchor(Vector2Int targetAnchor)
+        {
+            if (!IsServer) return false;
+            for (int i = 0; i < jobs.Count; i++)
+            {
+                if (jobs[i].Anchor == targetAnchor)
+                {
+                    ServerCancelJobAt(i);
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        // Cancels the job at index i. Used for cancel-all and targeted cancel paths.
         private void ServerCancelJobAt(int index)
         {
             if (index < 0 || index >= jobs.Count) return;