using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Web;

namespace Common
{
    public sealed class NetHelper
    {
        #region Ip(获取Ip)

        /// <summary>
        /// 获取Ip
        /// </summary>
        public static string Ip
        {
            get
            {
                var result = string.Empty;
                if (HttpContext.Current != null)
                    result = GetWebClientIp();
                if (!string.IsNullOrEmpty(result))
                    result = GetLanIp();
                return result;
            }
        }

        /// <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();
                }
                else
                {
                    return ip == "::1" ? "127.0.0.0" : ip;
                }
            }
            return string.Empty;
        }

        /// <summary>
        /// 获取Web远程Ip
        /// </summary>
        public static string GetWebRemoteIp()
        {
            return HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ?? HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
        }

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

        #endregion Ip(获取Ip)

        #region Host(获取主机名)

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

        /// <summary>
        /// 获取Web客户端主机名
        /// </summary>
        private static string GetWebClientHostName()
        {
            if (!HttpContext.Current.Request.IsLocal)
                return string.Empty;
            var ip = GetWebRemoteIp();
            var result = Dns.GetHostEntry(IPAddress.Parse(ip)).HostName;
            if (result == "localhost.localdomain")
                result = Dns.GetHostName();
            return result;
        }

        #endregion Host(获取主机名)

        #region Browser(获取浏览器信息)

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

        #endregion Browser(获取浏览器信息)

        #region 通过IP得到IP所在地省市



        /// <summary>
        /// 将Unicode编码转换成中文
        /// </summary>
        /// <param name="result"></param>
        /// <returns></returns>
        private static string ConvertUnicode2Chinese(string result)
        {
            Regex reg = new Regex(@"(?i)\\[uU]([0-9a-f]{4})");
            return reg.Replace(result, delegate (Match m)
            {
                return ((char)Convert.ToInt32(m.Groups[1].Value, 16)).ToString();
            });
        }

        private static bool HasContains(Predicate<string> handler, string str)
        {
            return handler.Invoke(str);
        }

        #endregion 通过IP得到IP所在地省市

        #region 其他

        /// <summary>
        /// IP地址信息
        /// </summary>
        private class IPAddressItem
        {
            public int ret { get; set; }
            public string start { get; set; }
            public string end { get; set; }
            public string country { get; set; }
            public string province { get; set; }
            public string city { get; set; }
            public string district { get; set; }
            public string isp { get; set; }
            public string type { get; set; }
            public string desc { get; set; }
        }

        #endregion 其他
    }
}