using System.Collections.Generic;
using System.Threading.Tasks;

public partial class Universe
{
    public decimal CurrentTick { get; private set; }
    public List<GameObject> GameObjects { get; private set; }

    public Ship PlayerShip { get; private set; }

    public Universe()
    {
        this.GameObjects = new List<GameObject>();
    }

    public decimal SimulateTick()
    {
        this.CurrentTick++;

        List<Task> galaxySimulationTasks = new List<Task>();

        foreach (GameObject gameObject in this.GameObjects)
        {
            if (gameObject.GetType().Name == "Galaxy")
            {
                Task galaxySimulation = new Task(() => gameObject.Simulate());
                galaxySimulation.Start();
                galaxySimulationTasks.Add(galaxySimulation);

                continue;
            }
            gameObject.Simulate();
        }

        Task.WaitAll(galaxySimulationTasks.ToArray());

        return this.CurrentTick;
    }
}