using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Threading.Tasks;
using xCommons.Models;

namespace xCommons.Helpers {
    public static class XNetworkHelper {
        /// <summary>
        /// Retrieve Application Host's Machin IP Addresses ...
        /// </summary>
        /// <returns>string</returns>
        public static string GetIp () {
            //
            var name = Dns.GetHostName (); // get container id
            var result = Dns.GetHostEntry (name)
                .AddressList
                .FirstOrDefault (
                    x => x.AddressFamily == AddressFamily.InterNetwork
                )
                .MapToIPv4 ()
                .ToString ();

            //
            return result;
        }

        /// <summary>
        /// Retrieve All Available IP's in Application Host's Machin ...
        /// </summary>
        /// <returns>a Collection of XNetworkInfo class instances</returns>
        public static IEnumerable<XNetworkInfo> GetNetworkInfos () {
            //
            var result = System.Net.NetworkInformation.NetworkInterface
                .GetAllNetworkInterfaces ()
                .Where (
                    ni =>
                    !ni.IsReceiveOnly &&
                    ni.OperationalStatus == OperationalStatus.Up &&
                    ni.NetworkInterfaceType != NetworkInterfaceType.Loopback
                )
                .SelectMany (ni =>
                    ni
                    .GetIPProperties ()
                    .GatewayAddresses
                    .Select (ga =>
                        new {
                            Name = ni.Name,
                                Description = ni.Description,
                                Gateway = ga.Address
                                .MapToIPv4 ()
                                .ToString (),
                                NI = ni
                        }
                    )
                )
                .SelectMany (data =>
                    data.NI
                    .GetIPProperties ()
                    .UnicastAddresses
                    .Select (ip =>
                        new  XNetworkInfo {
                            Name = data.Name,
                                Gateway = data.Gateway,
                                Description = data.Description,
                                NetworkInterface = data.NI,
                                IP = ip.Address
                                .MapToIPv4 ()
                                .ToString ()
                        }
                    )
                );

            //
            return result;
        }
    }
}