using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.ServiceModel.Discovery;

namespace ArchestrAServices.Common.Resolution;

public class Resolution
{
	private static string MostRecentIPAddressFromExe;

	[Obsolete("Use ArchestrAServices.Common.HostedService.Resolution.GetDiscoveryEndpointMetadata() instead.")]
	public static EndpointDiscoveryMetadata GetDiscoveryEndpointMetada(EndpointDiscoveryMetadata metaData)
	{
		string errorMessage;
		return GetDiscoveryEndpointMetada(metaData, out errorMessage);
	}

	[Obsolete("Use ArchestrAServices.Common.HostedService.Resolution.GetDiscoveryEndpointMetadata() instead.")]
	public static EndpointDiscoveryMetadata GetDiscoveryEndpointMetada(EndpointDiscoveryMetadata metaData, out string errorMessage)
	{
		errorMessage = string.Empty;
		try
		{
			if (metaData != null)
			{
				string[] array = null;
				NetworkInterface[] array2 = null;
				try
				{
					array2 = NetworkInterface.GetAllNetworkInterfaces();
				}
				catch (NetworkInformationException)
				{
					array2 = null;
				}
				if (array2 != null)
				{
					List<string> list = new List<string>();
					NetworkInterface[] array3 = array2;
					foreach (NetworkInterface networkInterface in array3)
					{
						if (networkInterface.NetworkInterfaceType != NetworkInterfaceType.Ethernet)
						{
							continue;
						}
						foreach (UnicastIPAddressInformation unicastAddress in networkInterface.GetIPProperties().UnicastAddresses)
						{
							if (unicastAddress.Address.AddressFamily == AddressFamily.InterNetwork && unicastAddress.SuffixOrigin != SuffixOrigin.LinkLayerAddress)
							{
								if (unicastAddress.SuffixOrigin == SuffixOrigin.Manual || unicastAddress.SuffixOrigin == SuffixOrigin.OriginDhcp)
								{
									list.Insert(0, unicastAddress.Address.ToString());
								}
								else
								{
									list.Add(unicastAddress.Address.ToString());
								}
							}
						}
					}
					list.Add(Environment.MachineName);
					array = list.ToArray();
				}
				UriBuilder uriBuilder = new UriBuilder(metaData.Address.Uri);
				if (uriBuilder != null && !string.IsNullOrEmpty(uriBuilder.Host))
				{
					metaData.ListenUris.Clear();
					string[] array4 = array;
					foreach (string host in array4)
					{
						uriBuilder.Host = host;
						Uri uri = uriBuilder.Uri;
						metaData.ListenUris.Add(uri);
					}
				}
			}
		}
		catch (Exception ex2)
		{
			errorMessage = "GetDiscoveryEndpointMetada: Exception " + ex2.Message;
		}
		return metaData;
	}

	[Obsolete("Legacy method. No longer supported due to deprecated Win32 methods being used.")]
	public static string ResolveIPAddress(string HostOrIP, out string errorMessage)
	{
		string empty = string.Empty;
		errorMessage = string.Empty;
		if (!Environment.Is64BitProcess)
		{
			try
			{
				empty = ResolveLocalIPAddr(HostOrIP, out errorMessage);
			}
			catch (Exception ex)
			{
				empty = string.Empty;
				errorMessage = "ResolveIPAddress caught exception: " + ex.Message;
			}
		}
		else
		{
			if (string.IsNullOrEmpty(MostRecentIPAddressFromExe))
			{
				string text = Guid.NewGuid().ToString() + "_Resolution";
				using PipeServer pipeServer = new PipeServer(text);
				if (File.Exists("aaASBResolveIP.exe"))
				{
					try
					{
						Process.Start("aaASBResolveIP.exe", text + " " + HostOrIP);
						MostRecentIPAddressFromExe = pipeServer.ReadString();
					}
					catch (Exception ex2)
					{
						errorMessage = $"ResolveIPAddress called in 64-bit process - exception starting or reading from helper process aaASBResolveIP.exe: {ex2.Message}";
					}
				}
				else
				{
					errorMessage = "ResolveIPAddress called in 64-bit process - could not find helper process aaASBResolveIP.exe, no resolution";
				}
			}
			empty = MostRecentIPAddressFromExe;
		}
		return empty;
	}

	private unsafe static string ResolveLocalIPAddr(string HostOrIP, out string errorMessage)
	{
		WinSock.WSAData lpWSAData;
		int num = WinSock.WSAStartup(514, out lpWSAData);
		string result = string.Empty;
		errorMessage = "Unknown failure in ResolveLocalIPAddr";
		if (num == 0)
		{
			int addr = WinSock.inet_addr(HostOrIP);
			WinSock.hostent* ptr = null;
			if (addr != -1)
			{
				int len = 4;
				ptr = WinSock.gethostbyaddr(ref addr, len, ProtocolFamily.InterNetwork);
				if (ptr == null)
				{
					result = string.Empty;
					errorMessage = "ResolveLocalIPAddr: call to gethostbyaddr for IP address " + HostOrIP + " failed to resolve a hostent struct";
				}
			}
			else
			{
				ptr = WinSock.gethostbyname(HostOrIP);
				if (ptr == null)
				{
					result = string.Empty;
					errorMessage = "ResolveLocalIPAddr: call to gethostbyname for host name " + HostOrIP + " failed to resolve a hostent struct";
				}
			}
			if (ptr != null)
			{
				byte* h_addr_list = *ptr->h_addr_list;
				int num2 = *h_addr_list;
				int num3 = h_addr_list[1];
				int num4 = h_addr_list[2];
				int num5 = h_addr_list[3];
				result = $"{num2}.{num3}.{num4}.{num5}";
				errorMessage = string.Empty;
			}
			WinSock.WSACleanup();
		}
		else
		{
			result = string.Empty;
			errorMessage = "ResolveLocalIPAddr: unable to initialize WinSock, WSAStartup returned error";
		}
		return result;
	}
}