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using System;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;

namespace Ryujinx.Horizon.Sdk.Account
{
    [StructLayout(LayoutKind.Sequential)]
    public readonly record struct Uid
    {
        public readonly long High;
        public readonly long Low;

        public bool IsNull => (Low | High) == 0;

        public static Uid Null => new(0, 0);

        public Uid(long low, long high)
        {
            Low  = low;
            High = high;
        }

        public Uid(byte[] bytes)
        {
            High = BitConverter.ToInt64(bytes, 0);
            Low  = BitConverter.ToInt64(bytes, 8);
        }

        public Uid(string hex)
        {
            if (hex == null || hex.Length != 32 || !hex.All("0123456789abcdefABCDEF".Contains))
            {
                throw new ArgumentException("Invalid Hex value!", nameof(hex));
            }

            Low  = Convert.ToInt64(hex[16..], 16);
            High = Convert.ToInt64(hex[..16], 16);
        }

        public void Write(BinaryWriter binaryWriter)
        {
            binaryWriter.Write(High);
            binaryWriter.Write(Low);
        }

        public override string ToString()
        {
            return High.ToString("x16") + Low.ToString("x16");
        }

        public LibHac.Account.Uid ToLibHacUid()
        {
            return new LibHac.Account.Uid((ulong)High, (ulong)Low);
        }

        public UInt128 ToUInt128()
        {
            return new UInt128((ulong)High, (ulong)Low);
        }
    }
}