using System;

//namespace lib;

public static class GuidExt
{
	extension(Guid g)
	{
		public string Log => $"{g.LastUShort():X8}";
	}

	public static System.Guid GuidFromLongs( long a, long b )
	{
		byte[] guidData = new byte[16];
		Array.Copy( BitConverter.GetBytes( a ), guidData, 8 );
		Array.Copy( BitConverter.GetBytes( b ), 0, guidData, 8, 8 );
		return new System.Guid( guidData );
	}

	public static (long, long) ToLongs( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		var long1 = BitConverter.ToInt64( bytes, 0 );
		var long2 = BitConverter.ToInt64( bytes, 8 );
		return (long1, long2);
	}

	public static System.Guid GuidFromULongs( ulong a, ulong b )
	{
		byte[] guidData = new byte[16];
		Array.Copy( BitConverter.GetBytes( a ), guidData, 8 );
		Array.Copy( BitConverter.GetBytes( b ), 0, guidData, 8, 8 );
		return new System.Guid( guidData );
	}

	public static (ulong, ulong) ToULongs( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		var ulong1 = BitConverter.ToUInt64( bytes, 0 );
		var ulong2 = BitConverter.ToUInt64( bytes, 8 );
		return (ulong1, ulong2);
	}

	public static System.Guid GuidFromInts( int a, int b, int c, int d )
	{
		byte[] guidData = new byte[16];
		Array.Copy( BitConverter.GetBytes( a ), guidData, 4 );
		Array.Copy( BitConverter.GetBytes( b ), 0, guidData, 4, 4 );
		Array.Copy( BitConverter.GetBytes( c ), 0, guidData, 8, 4 );
		Array.Copy( BitConverter.GetBytes( d ), 0, guidData, 12, 4 );
		return new System.Guid( guidData );
	}

	public static (int, int, int, int) ToInts( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		var a = BitConverter.ToInt32( bytes, 0 );
		var b = BitConverter.ToInt32( bytes, 4 );
		var c = BitConverter.ToInt32( bytes, 8 );
		var d = BitConverter.ToInt32( bytes, 12 );
		return (a, b, c, d);
	}


	public static uint LastUInt( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		var d = BitConverter.ToUInt32( bytes, 12 );
		return d;
	}

	public static System.Guid GuidFromUInts( uint a, uint b, uint c, uint d )
	{
		byte[] guidData = new byte[16];
		Array.Copy( BitConverter.GetBytes( a ), guidData, 4 );
		Array.Copy( BitConverter.GetBytes( b ), 0, guidData, 4, 4 );
		Array.Copy( BitConverter.GetBytes( c ), 0, guidData, 8, 4 );
		Array.Copy( BitConverter.GetBytes( d ), 0, guidData, 12, 4 );
		return new System.Guid( guidData );
	}

	public static (uint, uint, uint, uint) ToUInts( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		var a = BitConverter.ToUInt32( bytes, 0 );
		var b = BitConverter.ToUInt32( bytes, 4 );
		var c = BitConverter.ToUInt32( bytes, 8 );
		var d = BitConverter.ToUInt32( bytes, 12 );
		return (a, b, c, d);
	}

	public static ushort LastUShort( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		return BitConverter.ToUInt16( bytes, 14 );
	}

	public static byte LastByte( this System.Guid guid )
	{
		var bytes = guid.ToByteArray();
		return bytes[7];
	}
}