move backend to subfolder

tanks-backend/TanksServer/GameLogic/CollideBullets.cs

@@ -0,0 +1,88 @@
+namespace TanksServer.GameLogic;
+
+internal sealed class CollideBullets(
+    MapEntityManager entityManager,
+    MapService map,
+    IOptions<GameRules> options,
+    TankSpawnQueue tankSpawnQueue
+) : ITickStep
+{
+    private const int ExplosionRadius = 3;
+
+    public Task TickAsync(TimeSpan _)
+    {
+        entityManager.RemoveBulletsWhere(BulletHitsTank);
+        entityManager.RemoveBulletsWhere(TryHitAndDestroyWall);
+        entityManager.RemoveBulletsWhere(TimeoutBullet);
+        return Task.CompletedTask;
+    }
+
+    private bool TimeoutBullet(Bullet bullet)
+    {
+        if (bullet.Timeout > DateTime.Now)
+            return false;
+
+        var radius = bullet.IsExplosive ? ExplosionRadius : 0;
+        ExplodeAt(bullet.Position.ToPixelPosition(), radius, bullet.Owner);
+        return true;
+    }
+
+    private bool TryHitAndDestroyWall(Bullet bullet)
+    {
+        var pixel = bullet.Position.ToPixelPosition();
+        if (!map.Current.IsWall(pixel))
+            return false;
+
+        var radius = bullet.IsExplosive ? ExplosionRadius : 0;
+        ExplodeAt(pixel, radius, bullet.Owner);
+
+        return true;
+    }
+
+    private bool BulletHitsTank(Bullet bullet)
+    {
+        if (!TryHitTankAt(bullet.Position, bullet.Owner))
+            return false;
+
+        if (bullet.IsExplosive)
+            ExplodeAt(bullet.Position.ToPixelPosition(), ExplosionRadius, bullet.Owner);
+        return true;
+    }
+
+    private bool TryHitTankAt(FloatPosition position, Player owner)
+    {
+        foreach (var tank in entityManager.Tanks)
+        {
+            var (topLeft, bottomRight) = tank.Bounds;
+            if (position.X < topLeft.X || position.X > bottomRight.X ||
+                position.Y < topLeft.Y || position.Y > bottomRight.Y)
+                continue;
+
+            if (owner != tank.Owner)
+                owner.Scores.Kills++;
+            tank.Owner.Scores.Deaths++;
+
+            entityManager.Remove(tank);
+            tankSpawnQueue.EnqueueForDelayedSpawn(tank.Owner);
+            return true;
+        }
+
+        return false;
+    }
+
+    private void ExplodeAt(PixelPosition pixel, int i, Player owner)
+    {
+        for (var x = pixel.X - i; x <= pixel.X + i; x++)
+        for (var y = pixel.Y - i; y <= pixel.Y + i; y++)
+        {
+            var offsetPixel = new PixelPosition(x, y);
+            if (options.Value.DestructibleWalls)
+            {
+                map.Current.DestroyWallAt(offsetPixel);
+                owner.Scores.WallsDestroyed++;
+            }
+
+            TryHitTankAt(offsetPixel.ToFloatPosition(), owner);
+        }
+    }
+}