using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using SafeMobileLib;
using System.Net.NetworkInformation;

namespace SDRgateway
{
    class PingThread
    {
        string ip;
        private int interval;
        bool status;
        private Thread t_Ping;
        /// <summary>
        /// ping class
        /// </summary>
        /// <param name="ip">dest IP</param>
        /// <param name="interval">interval for pings in seconds</param>
        public PingThread(string ip, int interval)
        {
            this.ip = ip;
            this.interval = interval;
            status = false;

            t_Ping = new Thread(new ThreadStart(Worker));
            t_Ping.IsBackground = true;
            t_Ping.Start();
        }

        public void Worker()
        {
            SM.Debug("PingThread started for " + ip + " interval:" + interval);
            int count = 0;
            while (true)
            {
                try
                {
                    Thread.Sleep(Program.cfg.SDR_ping * 1000);
                    DateTime time = DateTime.Now;
                    //SM.Debug(ip + " ping sent!");
                    Ping pingSender = new Ping();
                    PingReply pReply = pingSender.Send(ip);
                    if (pReply.Status == IPStatus.Success)
                    {
                        if (status == false) //going from OFF->ON
                            OnNewPingComplete(true, ip);
                        status = true;
                    }
                    else //if (pReply.Status == IPStatus.TimedOut)
                    {
                        if (status == true) //going from ON->OFF
                            OnNewPingComplete(false, ip);
                        status = false;
                    }
                    if (count++ % 10 == 0)
                        SM.Debug(String.Format("Gateway {0} is {1}", ip, (status ? "ONLINE" : "OFFLINE")));
                    //SM.Debug(ip + " ping delta:" + (DateTime.Now -time) + " status:" + status);

                    
                }
                catch
                {
                    Console.WriteLine("*** Could not ping: " + ip + " *****");
                }
                Thread.Sleep(interval);
            }
        }

        public delegate void NewPingCompleteDEl(bool status, string ip);
        public event NewPingCompleteDEl OnNewPingComplete;
    }
}