Update Project

Assets/Scripts/Gameplay/Pipes/PipePool.cs

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+using System.Collections.Generic;
+using Zenject;
+
+namespace FlappyBird.Gameplay.Pipes
+{
+    /// <summary>
+    /// Pure C# object pool for PipeView prefab instances.
+    /// Pre-warming is deferred to Initialize() (called by Zenject after the
+    /// container is fully built) to avoid a circular dependency:
+    ///   PipePool → Factory → PipeView → IPipePool → PipePool
+    /// </summary>
+    public sealed class PipePool : IPipePool, IInitializable
+    {
+        private readonly Stack<PipeView>  _inactive = new Stack<PipeView>();
+        private readonly PipeSettings     _settings;
+        private readonly PipeView.Factory _factory;
+
+        /// <summary>Constructor injection — no instantiation here.</summary>
+        public PipePool(PipeSettings settings, PipeView.Factory factory)
+        {
+            _settings = settings;
+            _factory  = factory;
+        }
+
+        // ── IInitializable ─────────────────────────────────────────────────
+
+        /// <summary>
+        /// Called by Zenject after all bindings are resolved.
+        /// Safe to call Factory.Create() here because IPipePool is already registered.
+        /// </summary>
+        public void Initialize()
+        {
+            Prewarm(_settings.InitialPoolSize);
+        }
+
+        // ── IPipePool ──────────────────────────────────────────────────────
+
+        /// <inheritdoc/>
+        public PipeView Get()
+        {
+            PipeView pipe = _inactive.Count > 0
+                ? _inactive.Pop()
+                : _factory.Create();
+
+            pipe.OnSpawn();
+            return pipe;
+        }
+
+        /// <inheritdoc/>
+        public void Return(PipeView pipe)
+        {
+            pipe.OnDespawn();
+            _inactive.Push(pipe);
+        }
+
+        // ── Private helpers ────────────────────────────────────────────────
+
+        private void Prewarm(int count)
+        {
+            for (int i = 0; i < count; i++)
+            {
+                PipeView pipe = _factory.Create();
+                pipe.OnDespawn();
+                _inactive.Push(pipe);
+            }
+        }
+    }
+}