using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Serilog;
using Wood.Util.Browser;

namespace Wood.Util
{
    public class NetHelper
    {
        private static HttpContext HttpContext
        {
            get { return GlobalContext.ServiceProvider?.GetService<IHttpContextAccessor>()!.HttpContext!; }
        }

        public static string Ip
        {
            get
            {
                string result = string.Empty;
                if (HttpContext != null)
                {
                    result = GetWebClientIp();
                }
                if (string.IsNullOrEmpty(result))
                {
                    result = GetLanIp();
                }
                return result;
            }
        }

        private static string GetWebClientIp()
        {
            try
            {
                string ip = GetWebRemoteIp();
                foreach (var hostAddress in Dns.GetHostAddresses(ip))
                {
                    if (hostAddress.AddressFamily == AddressFamily.InterNetwork)
                    {
                        return hostAddress.ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                Log.Error(ex,"获取IP失败！");
            }
            return string.Empty;
        }

        public static string GetLanIp()
        {
            try
            {
                foreach (var hostAddress in Dns.GetHostAddresses(Dns.GetHostName()))
                {
                    if (hostAddress.AddressFamily == AddressFamily.InterNetwork)
                    {
                        return hostAddress.ToString();
                    }
                }
            }
            catch (Exception ex)
			{
				Log.Error(ex, "获取LanIP失败！");
			}
            return string.Empty;
        }

       

        private static string GetWebRemoteIp()
        {
            try
            {
                string? ip = HttpContext?.Connection?.RemoteIpAddress?.ToString();
                if (HttpContext != null && HttpContext.Request != null)
                {
                    if (HttpContext.Request.Headers.ContainsKey("X-Real-IP"))
                    {
                        ip = HttpContext.Request.Headers["X-Real-IP"].ToString();
                    }

                    if (HttpContext.Request.Headers.ContainsKey("X-Forwarded-For"))
                    {
                        ip = HttpContext.Request.Headers["X-Forwarded-For"].ToString();
                    }
                }
                return ip??"";
            }
            catch (Exception ex)
			{
				Log.Error(ex, "获取客户端远程IP失败！");
			}
            return string.Empty;
        }

        public static string Browser
        {
            get
            {
                try
                {
                    var browser = HttpContext.Request.Headers["User-Agent"];
                    var agent = UserAgent.ToString();
                    return BrowserHelper.GetBrwoserInfo(agent);
                }
                catch (Exception ex)
				{
					Log.Error(ex, "获取端远程浏览器信息失败！");
				}
                return string.Empty;
            }
        }

        public static string UserAgent
        {
            get
            {
                string? userAgent = string.Empty;
                try
                {
                    userAgent = HttpContext?.Request?.Headers["User-Agent"];
                }
                catch (Exception ex)
				{
					Log.Error(ex, "获取端远程浏览器【User-Agent】失败！");
				}
                return userAgent??string.Empty;
            }
        }

		#region 判断是否是外网IP
		public static bool IsInnerIP(string ipAddress)
		{
			bool isInnerIp = false;
			long ipNum = GetIpNum(ipAddress);
			/**
                私有IP：A类 10.0.0.0-10.255.255.255
                            B类 172.16.0.0-172.31.255.255
                            C类 192.168.0.0-192.168.255.255
                当然，还有127这个网段是环回地址 
           **/
			long aBegin = GetIpNum("10.0.0.0");
			long aEnd = GetIpNum("10.255.255.255");
			long bBegin = GetIpNum("172.16.0.0");
			long bEnd = GetIpNum("172.31.255.255");
			long cBegin = GetIpNum("192.168.0.0");
			long cEnd = GetIpNum("192.168.255.255");
			isInnerIp = IsInner(ipNum, aBegin, aEnd) || IsInner(ipNum, bBegin, bEnd) || IsInner(ipNum, cBegin, cEnd) || ipAddress.Equals("127.0.0.1");
			return isInnerIp;
		}

		/// <summary>
		/// 把IP地址转换为Long型数字
		/// </summary>
		/// <param name="ipAddress">IP地址字符串</param>
		/// <returns></returns>
		private static long GetIpNum(string ipAddress)
		{
			string[] ip = ipAddress.Split('.');
			long a = int.Parse(ip[0]);
			long b = int.Parse(ip[1]);
			long c = int.Parse(ip[2]);
			long d = int.Parse(ip[3]);

			long ipNum = a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d;
			return ipNum;
		}

		private static bool IsInner(long userIp, long begin, long end)
		{
			return (userIp >= begin) && (userIp <= end);
		}
		#endregion

		public static string GetOSVersion()
        {
            var osVersion = string.Empty;
            try
            {
                var userAgent = UserAgent;
                if (userAgent.Contains("NT 10"))
                {
                    osVersion = "Windows 10";
                }
                else if (userAgent.Contains("NT 6.3"))
                {
                    osVersion = "Windows 8";
                }
                else if (userAgent.Contains("NT 6.1"))
                {
                    osVersion = "Windows 7";
                }
                else if (userAgent.Contains("NT 6.0"))
                {
                    osVersion = "Windows Vista/Server 2008";
                }
                else if (userAgent.Contains("NT 5.2"))
                {
                    osVersion = "Windows Server 2003";
                }
                else if (userAgent.Contains("NT 5.1"))
                {
                    osVersion = "Windows XP";
                }
                else if (userAgent.Contains("NT 5"))
                {
                    osVersion = "Windows 2000";
                }
                else if (userAgent.Contains("NT 4"))
                {
                    osVersion = "Windows NT4";
                }
                else if (userAgent.Contains("Android"))
                {
                    osVersion = "Android";
                }
                else if (userAgent.Contains("Me"))
                {
                    osVersion = "Windows Me";
                }
                else if (userAgent.Contains("98"))
                {
                    osVersion = "Windows 98";
                }
                else if (userAgent.Contains("95"))
                {
                    osVersion = "Windows 95";
                }
                else if (userAgent.Contains("Mac"))
                {
                    osVersion = "Mac";
                }
                else if (userAgent.Contains("Unix"))
                {
                    osVersion = "UNIX";
                }
                else if (userAgent.Contains("Linux"))
                {
                    osVersion = "Linux";
                }
                else if (userAgent.Contains("SunOS"))
                {
                    osVersion = "SunOS";
                }
            }
            catch (Exception ex)
            {
                Log.Error(ex, "获取OS版本信息失败！");
            }
            return osVersion;
        }
    }
}