using System.Diagnostics;
using System.Runtime.CompilerServices;
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)
    {
        Debug.Assert(float.IsFinite(x));
        Debug.Assert(float.IsFinite(y));

        X = x;
        Y = y;
    }

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

public enum EntityState : byte
{
    Inactive = 0,
    Active,
    Removed,
    Dead
}

public enum PlayerInput : byte
{
    Up = 1 << 0,
    Down = 1 << 1,
    Left = 1 << 2,
    Right = 1 << 3
}

[StructLayout(LayoutKind.Sequential)]
public struct Player
{
    public EntityState State { get; }
    private byte input;
    public Vec2 Position { get; set; }
    public Vec2 Velocity { get; set; }
}

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

[StructLayout(LayoutKind.Sequential)]
public struct Snapshot
{
    [InlineArray(Constants.WorldMaxPlayers)]
    public struct PlayerArray
    {
        private Player _element0;
    }

    [InlineArray(Constants.WorldMaxBullets)]
    public struct BallArray
    {
        private Bullet _element0;
    }

    private byte active;
    public uint Tick { get; }
    public PlayerArray Players { get; }
    public BallArray Bullets { get; }
}

public enum LogLevel
{
    Trace,
    Debug,
    Info,
    Warn,
    Error,
    Fatal
}

public delegate void LoggerDelegate(LogLevel level, string source, int line, string message);