using System.Runtime.CompilerServices;
using ILGPU;
using ILGPU.Runtime;

namespace PerfectNumbers.Core.Gpu.Accelerators;

public readonly struct HeuristicCombinedGpuViews(
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorsEnding1,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorsEnding3,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorsEnding7,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorsEnding9,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorSquaresEnding1,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorSquaresEnding3,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorSquaresEnding7,
		ArrayView1D<ulong, Stride1D.Dense> combinedDivisorSquaresEnding9)
{
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorsEnding1 = combinedDivisorsEnding1;
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorsEnding3 = combinedDivisorsEnding3;
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorsEnding7 = combinedDivisorsEnding7;
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorsEnding9 = combinedDivisorsEnding9;
	public readonly (ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>) CombinedDivisorsAndSquaresEnding1 = (combinedDivisorsEnding1, combinedDivisorSquaresEnding1);

	public readonly (ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>) CombinedDivisorsAndSquaresEnding3 = (combinedDivisorsEnding3, combinedDivisorSquaresEnding3);

	public readonly (ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>) CombinedDivisorsAndSquaresEnding7 = (combinedDivisorsEnding7, combinedDivisorSquaresEnding7);

	public readonly (ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>) CombinedDivisorsAndSquaresEnding9 = (combinedDivisorsEnding9, combinedDivisorSquaresEnding9);

	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorSquaresEnding1 = combinedDivisorSquaresEnding1;
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorSquaresEnding3 = combinedDivisorSquaresEnding3;
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorSquaresEnding7 = combinedDivisorSquaresEnding7;
	// public readonly ArrayView1D<ulong, Stride1D.Dense> CombinedDivisorSquaresEnding9 = combinedDivisorSquaresEnding9;

	private static readonly (ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>)EmptyCombinedDivisorsAndSquares = (ArrayView1D<ulong, Stride1D.Dense>.Empty, ArrayView1D<ulong, Stride1D.Dense>.Empty);

	// [MethodImpl(MethodImplOptions.AggressiveInlining)]
	// public ArrayView1D<ulong, Stride1D.Dense> SelectDivisors(byte ending) => ending switch
	// {
	// 	1 => CombinedDivisorsEnding1,
	// 	3 => CombinedDivisorsEnding3,
	// 	7 => CombinedDivisorsEnding7,
	// 	9 => CombinedDivisorsEnding9,
	// 	_ => ArrayView1D<ulong, Stride1D.Dense>.Empty,
	// };

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>) SelectDivisorsAndSquares(byte ending) => ending switch
	{
		1 => CombinedDivisorsAndSquaresEnding1,
		3 => CombinedDivisorsAndSquaresEnding3,
		7 => CombinedDivisorsAndSquaresEnding7,
		9 => CombinedDivisorsAndSquaresEnding9,
		_ => EmptyCombinedDivisorsAndSquares,
	};

	// [MethodImpl(MethodImplOptions.AggressiveInlining)]
	// public ArrayView1D<ulong, Stride1D.Dense> SelectDivisorSquares(byte ending) => ending switch
	// {
	// 	1 => CombinedDivisorSquaresEnding1,
	// 	3 => CombinedDivisorSquaresEnding3,
	// 	7 => CombinedDivisorSquaresEnding7,
	// 	9 => CombinedDivisorSquaresEnding9,
	// 	_ => ArrayView1D<ulong, Stride1D.Dense>.Empty,
	// };
}