using System;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Security;

namespace ArchestrAServices.Common.Resolution;

[SuppressUnmanagedCodeSecurity]
internal class WinSock
{
	[StructLayout(LayoutKind.Sequential, Pack = 1)]
	public struct WSAData
	{
		[MarshalAs(UnmanagedType.U2)]
		public ushort wVersion;

		[MarshalAs(UnmanagedType.U2)]
		public ushort wHighVersion;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 257)]
		private byte[] szDescription;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 129)]
		private byte[] szSystemStatus;

		[MarshalAs(UnmanagedType.U2)]
		public ushort iMaxSockets;

		[MarshalAs(UnmanagedType.U2)]
		public ushort iMaxUdpDg;

		[MarshalAs(UnmanagedType.LPStr)]
		public string lpVendorInfo;
	}

	[StructLayout(LayoutKind.Sequential, Pack = 1)]
	public struct hostent
	{
		public IntPtr h_name;

		public IntPtr h_aliases;

		[MarshalAs(UnmanagedType.I2)]
		public short h_addrtype;

		[MarshalAs(UnmanagedType.I2)]
		public short h_length;

		public unsafe byte** h_addr_list;
	}

	internal const uint INADDR_NONE = uint.MaxValue;

	[DllImport("ws2_32", CharSet = CharSet.Ansi, SetLastError = true)]
	internal static extern int WSAStartup([In][MarshalAs(UnmanagedType.U2)] ushort wVersionRequested, [MarshalAs(UnmanagedType.Struct)] out WSAData lpWSAData);

	[DllImport("ws2_32", CharSet = CharSet.Ansi, SetLastError = true)]
	internal static extern int WSACleanup();

	[DllImport("ws2_32", CharSet = CharSet.Ansi, SetLastError = true)]
	internal unsafe static extern hostent* gethostbyaddr([In][MarshalAs(UnmanagedType.I4)] ref int addr, [In][MarshalAs(UnmanagedType.I4)] int len, [In] ProtocolFamily type);

	[DllImport("ws2_32", BestFitMapping = false, CharSet = CharSet.Ansi, SetLastError = true)]
	internal unsafe static extern hostent* gethostbyname([In] string host);

	[DllImport("ws2_32", BestFitMapping = false, CharSet = CharSet.Ansi, SetLastError = true)]
	internal static extern int inet_addr([In] string cp);
}