using ERP.Framework.Exceptions;
using ERP.Framework.Resource;
using Microsoft.AspNetCore.Http;
using System.Net;
using System.Net.NetworkInformation;

namespace ERP.Framework.Utils
{
    public class IPUtil
    {
        public static string GetServerIp()
        {
            var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();

            foreach (NetworkInterface networkInterface in networkInterfaces)
            {
                // 过滤掉非活动和环回接口
                if (networkInterface.OperationalStatus == OperationalStatus.Up)
                {
                    IPInterfaceProperties ipProperties = networkInterface.GetIPProperties();

                    foreach (UnicastIPAddressInformation ipAddress in ipProperties.UnicastAddresses)
                    {
                        // 过滤IPv6地址和保留地址
                        if (ipAddress.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork &&
                            !IPAddress.IsLoopback(ipAddress.Address) &&
                            !ipAddress.Address.IsIPv6LinkLocal &&
                            !ipAddress.Address.IsIPv6Multicast &&
                            !ipAddress.Address.IsIPv6SiteLocal &&
                            !ipAddress.Address.IsIPv6Teredo)
                        {
                            return ipAddress.Address.ToString();
                        }
                    }
                }
            }

            throw new CodeException(message: FrameworkI18N.NoIP, code: ErrorCode.NO_IP);
        }

        /// <summary>
        /// 获取客户端IP
        /// </summary>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public static string GetClientIp()
        {
            var httpContextAccessor = new HttpContextAccessor();
            var httpContext = httpContextAccessor.HttpContext;

            var ip = httpContext!.Request.Headers["Cdn-Src-Ip"].FirstOrDefault();
            if (!string.IsNullOrEmpty(ip))
                return IpReplace(ip);

            ip = httpContext.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (!string.IsNullOrEmpty(ip))
                return IpReplace(ip);

            var remoteIpAddress = httpContext.Connection.RemoteIpAddress;

            if (remoteIpAddress != null)
            {
                return remoteIpAddress.ToString();
            }
            else
            {
                throw new CodeException(message: FrameworkI18N.NoIP, code: ErrorCode.NO_IP);
            }
        }

        /// <summary>
        /// 处理 IPV6
        /// </summary>
        /// <param name="inip"></param>
        /// <returns></returns>
        private static string IpReplace(string inip)
        {
            return inip.Contains("::ffff:") ? inip.Replace("::ffff:", "") : inip;
        }
    }
}