Update Project

Assets/Scripts/Gameplay/Pipes/PipeSpawner.cs

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+using UnityEngine;
+namespace FlappyBird.Gameplay.Pipes
+{
+    /// <summary>
+    /// Pure C# service — all pipe-spawning and timing logic.
+    /// No MonoBehaviour, no Unity lifecycle. Ticked externally by PipeSpawnerTicker.
+    /// </summary>
+    public sealed class PipeSpawner : IPipeSpawner
+    {
+        private readonly IPipePool    _pool;
+        private readonly PipeSettings _settings;
+        private float _timer;
+        /// <summary>Constructor injection.</summary>
+        public PipeSpawner(IPipePool pool, PipeSettings settings)
+        {
+            _pool     = pool;
+            _settings = settings;
+        }
+        // ── IPipeSpawner ───────────────────────────────────────────────────
+        /// <inheritdoc/>
+        public void Tick(float deltaTime)
+        {
+            _timer += deltaTime;
+            if (_timer >= _settings.SpawnInterval)
+            {
+                _timer -= _settings.SpawnInterval;
+                SpawnPair();
+            }
+        }
+        /// <inheritdoc/>
+        public void ResetTimer() => _timer = 0f;
+        // ── Private helpers ────────────────────────────────────────────────
+        /// <summary>
+        /// Fetches a pipe pair from the pool, positions it with a random gap centre,
+        /// then places the top and bottom pipe transforms around that gap.
+        /// </summary>
+        private void SpawnPair()
+        {
+            float gapCentreY  = Random.Range(_settings.MinGapCentreY, _settings.MaxGapCentreY);
+            float halfGap     = _settings.GapSize * 0.5f;
+            float pipeOffset  = _settings.PipeHalfHeight; // shifts pivot to tip when centred
+
+            PipeView pipe = _pool.Get();
+
+            pipe.transform.position = new Vector3(_settings.SpawnX, 0f, 0f);
+
+            // Bottom pipe: pivot centre pushed downward so the tip meets the gap edge.
+            pipe.BottomPipe.position = new Vector3(
+                _settings.SpawnX,
+                gapCentreY - halfGap - pipeOffset,
+                0f);
+
+            // Top pipe: pivot centre pushed upward so the tip meets the gap edge.
+            pipe.TopPipe.position = new Vector3(
+                _settings.SpawnX,
+                gapCentreY + halfGap + pipeOffset,
+                0f);
+        }
+    }
+}