using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.CompilerServices;
using System.Text;

namespace Nirvana.Common
{
    /// <summary>
    /// 网络操作
    /// </summary>
    public class Net
    {
        public static string Ip
        {
            get
            {
                try
                {
                    var result = string.Empty;
                    if (MyHttpContext.current != null)
                        result = GetWebClientIp();
                    if (string.IsNullOrWhiteSpace(result))
                        result = GetLanIp();
                    return result;
                }
                catch (System.Exception)
                {

                    return string.Empty;
                }
            }
        }


        /// <summary>
        /// 获取Web客户端的Ip
        /// </summary>
        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;
        }

        /// <summary>
        /// 获取远程IP
        /// </summary>
        /// <returns></returns>
        private static string GetWebRemoteIp()
        {
            var ip =  MyHttpContext.current.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (string.IsNullOrEmpty(ip))
            {
                ip = MyHttpContext.current.Connection.RemoteIpAddress.ToString();
            }
            return ip;
        }

        /// <summary>
        /// 获取局域网IP
        /// </summary>
        private static string GetLanIp()
        {
            string userIP = "";
            System.Net.NetworkInformation.NetworkInterface[] fNetworkInterfaces = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
            foreach (System.Net.NetworkInformation.NetworkInterface adapter in fNetworkInterfaces)
            {
                string fRegistryKey = "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}\\" + adapter.Id + "\\Connection";
                Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(fRegistryKey, false);
                if (rk != null)
                {
                    // 区分 PnpInstanceID      
                    // 如果前面有 PCI 就是本机的真实网卡          
                    string fPnpInstanceID = rk.GetValue("PnpInstanceID", "").ToString();
                    int fMediaSubType = Convert.ToInt32(rk.GetValue("MediaSubType", 0));
                    if (fPnpInstanceID.Length > 3 &&
                     fPnpInstanceID.Substring(0, 3) == "PCI")
                    {
                        //string fCardType = "物理网卡";
                        System.Net.NetworkInformation.IPInterfaceProperties fIPInterfaceProperties = adapter.GetIPProperties();
                        System.Net.NetworkInformation.UnicastIPAddressInformationCollection UnicastIPAddressInformationCollection = fIPInterfaceProperties.UnicastAddresses;
                        foreach (System.Net.NetworkInformation.UnicastIPAddressInformation UnicastIPAddressInformation in UnicastIPAddressInformationCollection)
                        {
                            if (UnicastIPAddressInformation.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                                userIP = UnicastIPAddressInformation.Address.ToString(); // Ip 地址     
                        }
                        break;
                    }

                }
            }
            return userIP;
        }

    }

}