move backend to subfolder

tanks-backend/TanksServer/GameLogic/TankSpawnQueue.cs

@@ -0,0 +1,54 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace TanksServer.GameLogic;
+
+internal sealed class TankSpawnQueue(
+    IOptions<GameRules> options,
+    MapEntityManager entityManager
+): ITickStep
+{
+    private readonly ConcurrentQueue<Player> _queue = new();
+    private readonly ConcurrentDictionary<Player, DateTime> _spawnTimes = new();
+    private readonly TimeSpan _spawnDelay = TimeSpan.FromMilliseconds(options.Value.SpawnDelayMs);
+    private readonly TimeSpan _idleTimeout = TimeSpan.FromMilliseconds(options.Value.IdleTimeoutMs);
+
+    public void EnqueueForImmediateSpawn(Player player) => _queue.Enqueue(player);
+
+    public void EnqueueForDelayedSpawn(Player player)
+    {
+        _queue.Enqueue(player);
+        _spawnTimes.AddOrUpdate(player, DateTime.MinValue, (_, _) => DateTime.Now + _spawnDelay);
+    }
+
+    private bool TryDequeueNext([MaybeNullWhen(false)] out Player player)
+    {
+        if (!_queue.TryDequeue(out player))
+            return false; // no one on queue
+
+        if (player.LastInput + _idleTimeout < DateTime.Now)
+        {
+            // player idle
+            _queue.Enqueue(player);
+            return false;
+        }
+
+        var now = DateTime.Now;
+        if (_spawnTimes.GetOrAdd(player, DateTime.MinValue) > now)
+        {
+            // spawn delay
+            _queue.Enqueue(player);
+            return false;
+        }
+
+        return true;
+    }
+
+    public Task TickAsync(TimeSpan _)
+    {
+        if (!TryDequeueNext(out var player))
+            return Task.CompletedTask;
+
+        entityManager.SpawnTank(player);
+        return Task.CompletedTask;
+    }
+}