improve spawn position checks

TanksServer/GameLogic/SpawnQueue.cs

@@ -0,0 +1,36 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace TanksServer.GameLogic;
+
+internal sealed class SpawnQueue(
+    IOptions<PlayersConfiguration> options
+)
+{
+    private ConcurrentQueue<Player> _queue = new();
+    private ConcurrentDictionary<Player, DateTime> _spawnTimes = new();
+    private readonly TimeSpan _spawnDelay = TimeSpan.FromMilliseconds(options.Value.SpawnDelayMs);
+
+    public void EnqueueForImmediateSpawn(Player player)
+    {
+        _queue.Enqueue(player);
+    }
+
+    public void EnqueueForDelayedSpawn(Player player)
+    {
+        _queue.Enqueue(player);
+        _spawnTimes.AddOrUpdate(player, DateTime.MinValue, (_, _) => DateTime.Now + _spawnDelay);
+    }
+
+    public bool TryDequeueNext([MaybeNullWhen(false)] out Player player)
+    {
+        if (!_queue.TryDequeue(out player))
+            return false;
+
+        var now = DateTime.Now;
+        if (_spawnTimes.GetOrAdd(player, DateTime.MinValue) <= now)
+            return true;
+
+        _queue.Enqueue(player);
+        return false;
+    }
+}