using System.Runtime.CompilerServices;

namespace PerfectNumbers.Core.Cpu;

public static class ByteExtensions
{
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod3(this byte value, byte delta)
	{
		const int Modulus = 3;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}


	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod7(this byte value, byte delta)
	{
		const int Modulus = 7;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod13(this byte value, byte delta)
	{
		const int Modulus = 13;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod17(this byte value, byte delta)
	{
		const int Modulus = 17;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod19(this byte value, byte delta)
	{
		const int Modulus = 19;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod10(this byte value, byte delta)
	{
		const int Modulus = 10;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod11(this byte value, byte delta)
	{
		const int Modulus = 11;
		int sum = value + delta;

		if (sum >= Modulus)
		{
			sum -= Modulus;
		}

		return (byte)sum;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static byte AddMod8(this byte value, byte delta)
	{
		return (byte)((value + delta) & 7);
	}
}