using System.Collections.Generic;
using System.Numerics;
using System.Runtime.InteropServices;
using Nerfed.Runtime.Graphics;
using Nerfed.Runtime.Graphics.PackedVector;

namespace Nerfed.Runtime;

/// <summary>
/// Conversion utilities for interop.
/// </summary>
public static class Conversions
{
	private readonly static Dictionary<VertexElementFormat, uint> Sizes = new Dictionary<VertexElementFormat, uint>
	{
		{ VertexElementFormat.Byte4, (uint) Marshal.SizeOf<Byte4>() },
		{ VertexElementFormat.Color, (uint) Marshal.SizeOf<Color>() },
		{ VertexElementFormat.Float, (uint) Marshal.SizeOf<float>() },
		{ VertexElementFormat.HalfVector2, (uint) Marshal.SizeOf<HalfVector2>() },
		{ VertexElementFormat.HalfVector4, (uint) Marshal.SizeOf<HalfVector4>() },
		{ VertexElementFormat.NormalizedShort2, (uint) Marshal.SizeOf<NormalizedShort2>() },
		{ VertexElementFormat.NormalizedShort4, (uint) Marshal.SizeOf<NormalizedShort4>() },
		{ VertexElementFormat.Short2, (uint) Marshal.SizeOf<Short2>() },
		{ VertexElementFormat.Short4, (uint) Marshal.SizeOf<Short4>() },
		{ VertexElementFormat.Uint, (uint) Marshal.SizeOf<uint>() },
		{ VertexElementFormat.Vector2, (uint) Marshal.SizeOf<Vector2>() },
		{ VertexElementFormat.Vector3, (uint) Marshal.SizeOf<Vector3>() },
		{ VertexElementFormat.Vector4, (uint) Marshal.SizeOf<Vector4>() }
	};

	public static byte BoolToByte(bool b)
	{
			return (byte) (b ? 1 : 0);
		}

	public static bool ByteToBool(byte b)
	{
			return b != 0;
		}

	public static int BoolToInt(bool b)
	{
			return b ? 1 : 0;
		}

	public static bool IntToBool(int b)
	{
			return b != 0;
		}

	public static uint VertexElementFormatSize(VertexElementFormat format)
	{
			return Sizes[format];
		}
}