using NLog;
using System;
using System.Configuration;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Threading.Tasks;

namespace PingTool
{
    public static class Util
    {
        public static bool IsPingable(string thisPcIP, string address, int timeOut = Constant.PING_TIMEOUT_MS)
        {
            var pingTask = Task.Factory.StartNew(async () =>
            {
                bool isPingable = false;
                Ping pinger = new Ping();
                Logger pingLogger = LogManager.GetLogger(Constant.PING_LOGGER_FILE_NAME);
                try
                {
                    PingReply reply = await pinger.SendPingAsync(address, timeOut);
                    isPingable = reply.Status == IPStatus.Success;
                    if (!isPingable)
                    {
                        pingLogger.Log(LogLevel.Info, $"{DateTime.Now.ToString(Constant.DATETIME_FORMAT)}\tPing from {thisPcIP} to {address} status: {reply.Status}. Respone Time: {reply.RoundtripTime}");
                    }
                }
                catch (Exception ex)
                {
                    isPingable = false;
                    pingLogger.Log(LogLevel.Error, $"{DateTime.Now.ToString(Constant.DATETIME_FORMAT)}\tPing from {thisPcIP} to {address} exception: ", ex.Message);
                }
                finally
                {
                    pinger.Dispose();
                }
                return isPingable;
            });

            return pingTask.Result.Result;
        }

        public static string GetLocalIPAddress()
        {
            Logger pingLogger = LogManager.GetLogger(Constant.PING_LOGGER_FILE_NAME);
            try
            {
                string prefixIP = ConfigurationManager.AppSettings[Constant.PREFIX_IP_CONFIGURATION_KEY];
                string hostName = Dns.GetHostName();
                var localIPAddress = Dns.GetHostEntry(hostName)
                    .AddressList.Where(x => x.ToString().Contains(prefixIP))
                    .FirstOrDefault()
                    .ToString();
                pingLogger.Log(LogLevel.Info, $"{DateTime.Now.ToString(Constant.DATETIME_FORMAT)}\tLocal IP Address: {localIPAddress}");
                return localIPAddress;
            }
            catch (Exception ex)
            {
                pingLogger.Log(LogLevel.Error, $"{DateTime.Now.ToString(Constant.DATETIME_FORMAT)}\tException message: {ex.Message}");
                return string.Empty;
            }
        }
    }
}