using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Net.Http.Headers;
using NPOI.HPSF;
using NPOI.SS.Formula.Functions;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Web;
 

namespace WMS.Util
{
	/// <summary>
	/// 描 述：网络操作
	/// </summary>
	public class NetUtil
	{
		#region Ip(获取Ip)
		/// <summary>
		/// 获取Ip
		/// </summary>
		public static string Ip
		{
			get
			{
				var result = string.Empty;
				if (WebUtil.HttpContext != null)
					result = GetWebClientIp();
				if (result.IsEmpty())
					result = GetLanIp();
				return result;
			}
		}
		/// <summary>
		/// 获取Web客户端的Ip
		/// </summary>
		/// <returns></returns>
		private static string GetWebClientIp()
		{
			var ip = GetWebRemoteIp();
			foreach (var hostAddress in Dns.GetHostAddresses(ip))
			{
				if (hostAddress.AddressFamily == AddressFamily.InterNetwork)
					return hostAddress.ToString();
			}
			return string.Empty;
		}

		public static string GetWebRemoteIp()
		{
			string remoteIp = null;
			// Get the IP address of the client making the request
			if (WebUtil.HttpContext.Request.Headers["X-Forwarded-For"] != "")
			{
				string[] forwardedFor = WebUtil.HttpContext.Request.Headers["X-Forwarded-For"].ToString().Split(',');
				if (forwardedFor.Length > 0)
				{
					remoteIp = forwardedFor[forwardedFor.Length - 1];
				}
			}
			else
			{
				//remoteIp = WebUtil.HttpContext.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
				// Use the HTTP_X_FORWARDED_FOR environment variable
				remoteIp = WebUtil.HttpContext.Request.Headers["HTTP_X_FORWARDED_FOR"];
			}

			return remoteIp;
		}
		/// <summary>
		/// 获取局域网IP
		/// </summary>
		/// <returns></returns>
		private static string GetLanIp()
		{
			foreach (var hostAddress in Dns.GetHostAddresses(Dns.GetHostName()))
			{
				if (hostAddress.AddressFamily == AddressFamily.InterNetwork)
					return hostAddress.ToString();
			}
			return string.Empty;
		}
		#endregion

		#region Host(获取主机名)
		/// <summary>
		/// 获取主机名
		/// </summary>
		public static string Host
		{
			get
			{
				return WebUtil.HttpContext == null ? Dns.GetHostName() : GetWebClientHostName();
			}
		}
		public string GetClientHostName()
		{
			string hostname = "";

			if (WebUtil.HttpContext.Request.Headers.ContainsKey("X-Forwarded-Host"))
			{
				hostname = WebUtil.HttpContext.Request.Headers["X-Forwarded-Host"];
			}
			else
			{
				hostname = WebUtil.HttpContext.Request.Host.Host;
			}

			return hostname;
		}
		/// <summary>
		/// 获取Web客户端主机名
		/// </summary>
		/// <returns></returns>
		private static string GetWebClientHostName()
		{

			var ip = GetWebRemoteIp();
			var result = Dns.GetHostEntry(IPAddress.Parse(ip)).HostName;
			if (result == "localhost.localdomain")
				result = Dns.GetHostName();
			return result;
		}

		#endregion

		#region Browser(获取浏览器信息)
		/// <summary>
		/// 获取浏览器信息
		/// </summary>
		//public static string Browser
		//{
		//	get
		//	{
		//		if (WebUtil.HttpContext == null)
		//			return string.Empty;
		//		var browser = WebUtil.HttpContext.Request.Browser;
		//		return string.Format("{0} {1}", browser.Browser, browser.Version);
		//	}
		//} 
	#endregion
}
}