using System.Runtime.InteropServices;

namespace Djup.Native;

[StructLayout(LayoutKind.Sequential)]
public struct Vec2
{
    public float X { get; }
    public float Y { get; }

    public Vec2(float x, float y)
    {
        X = x;
        Y = y;
    }

    public override string ToString() => $"({X}, {Y})";
}

public enum EntityKind
{
    None = 0,
    Ball
}

[StructLayout(LayoutKind.Explicit)]
public struct Entity
{
    [FieldOffset(0)]
    public EntityKind kind;

    [FieldOffset(4)]
    public Ball ball;
}

[StructLayout(LayoutKind.Sequential)]
public struct Ball
{
    public Vec2 Position { get; set; }
    public Vec2 Velocity { get; set; }
}