using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading.Tasks;
using System.Timers;
using System.Runtime.InteropServices;
using SafeMobileLib;
using System.Text.RegularExpressions;
using SafeMobileLib.Registration;
using SafeMobileLib.Helpers;
using System.Configuration;
using System.Windows.Controls;
using SDRGatewayService.Enums;
using System.Threading;

namespace SDRGatewayService
{
    //sc create SDRGatewayService binPath="E:\WorkSpace_cSharp\SafeDispatch_v4\ServiceGatewaySDR\bin\Debug\SDRGatewayService.exe" start= auto
    //C:\Windows\Microsoft.NET\Framework64\v4.0.30319>InstallUtil.exe /u E:\WorkSpace_cSharp\Services\MyNewService\MyNewService\bin\Debug\SDRGatewayService.exe
    public enum ServiceState
    {
        SERVICE_STOPPED = 0x00000001,
        SERVICE_START_PENDING = 0x00000002,
        SERVICE_STOP_PENDING = 0x00000003,
        SERVICE_RUNNING = 0x00000004,
        SERVICE_CONTINUE_PENDING = 0x00000005,
        SERVICE_PAUSE_PENDING = 0x00000006,
        SERVICE_PAUSED = 0x00000007,
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct ServiceStatus
    {
        public int dwServiceType;
        public ServiceState dwCurrentState;
        public int dwControlsAccepted;
        public int dwWin32ExitCode;
        public int dwServiceSpecificExitCode;
        public int dwCheckPoint;
        public int dwWaitHint;
    };

    public partial class SDRGatewayService : ServiceBase
    {
        public bool registered = false;
        private int eventId = 1;
        private SDR SDRConnector;

        [DllImport("advapi32.dll", SetLastError = true)]
        private static extern bool SetServiceStatus(IntPtr handle, ref ServiceStatus serviceStatus);

        public SDRGatewayService(string[] args)
        {
            InitializeComponent();
            string eventSourceName = "SDRGatewayServiceSource";
            string logName = "SDRGatewayServiceLog";
            if (args.Count() > 0)
            {
                eventSourceName = args[0];
            }
            if (args.Count() > 1)
            {
                logName = args[1];
            }
            eventLog1 = new System.Diagnostics.EventLog();
            if (!System.Diagnostics.EventLog.SourceExists(eventSourceName))
            {
                System.Diagnostics.EventLog.CreateEventSource(eventSourceName, logName);
            }
            eventLog1.Source = eventSourceName;
            eventLog1.Log = logName;


        }

        protected override void OnStart(string[] args)
        {
            // Update the service state to Start Pending.  
            ServiceStatus serviceStatus = new ServiceStatus();
            serviceStatus.dwCurrentState = ServiceState.SERVICE_START_PENDING;
            serviceStatus.dwWaitHint = 100000;
            SetServiceStatus(this.ServiceHandle, ref serviceStatus);
            
            

            // Set up a timer to trigger every minute.  
            System.Timers.Timer timer = new System.Timers.Timer();
            timer.Interval = 20000; // 60 seconds  
            timer.Elapsed += new System.Timers.ElapsedEventHandler(this.OnTimer);
            timer.Start();

            // Update the service state to Running.  
            serviceStatus.dwCurrentState = ServiceState.SERVICE_RUNNING;
            SetServiceStatus(this.ServiceHandle, ref serviceStatus);


            this.OnRegistrationCompleted += OnRegistrationResponseHandler;

            Register(true);

        }

        public void OnTimer(object sender, ElapsedEventArgs e)
        {
            if (!registered)
                Register(true);
        }

        protected override void OnStop()
        {
        }

        private void eventLog1_EntryWritten(object sender, EntryWrittenEventArgs e)
        {

        }

        //#region Service COntrol
        ///// <summary>
        ///// Start a service by it's name
        ///// </summary>
        ///// <param name="ServiceName"></param>
        //public void startService(string ServiceName)
        //{
        //    ServiceController sc = new ServiceController();
        //    sc.ServiceName = ServiceName;

        //    Console.WriteLine("The {0} service status is currently set to {1}", ServiceName, sc.Status.ToString());

        //    if (sc.Status == ServiceControllerStatus.Stopped)
        //    {
        //        // Start the service if the current status is stopped.
        //        Console.WriteLine("Starting the {0} service ...", ServiceName);
        //        try
        //        {
        //            // Start the service, and wait until its status is "Running".
        //            sc.Start();
        //            sc.WaitForStatus(ServiceControllerStatus.Running);

        //            // Display the current service status.
        //            Console.WriteLine("The {0} service status is now set to {1}.", ServiceName, sc.Status.ToString());
        //        }
        //        catch (InvalidOperationException e)
        //        {
        //            Console.WriteLine("Could not start the {0} service.", ServiceName);
        //            Console.WriteLine(e.Message);
        //        }
        //    }
        //    else
        //    {
        //        Console.WriteLine("Service {0} already running.", ServiceName);
        //    }
        //}

        ///// <summary>
        ///// Stop a service that is active
        ///// </summary>
        ///// <param name="ServiceName"></param>
        //public void stopService(string ServiceName)
        //{
        //    ServiceController sc = new ServiceController();
        //    sc.ServiceName = ServiceName;

        //    Console.WriteLine("The {0} service status is currently set to {1}", ServiceName, sc.Status.ToString());

        //    if (sc.Status == ServiceControllerStatus.Running)
        //    {
        //        // Start the service if the current status is stopped.
        //        Console.WriteLine("Stopping the {0} service ...", ServiceName);
        //        try
        //        {
        //            // Start the service, and wait until its status is "Running".
        //            sc.Stop();
        //            sc.WaitForStatus(ServiceControllerStatus.Stopped);

        //            // Display the current service status.
        //            Console.WriteLine("The {0} service status is now set to {1}.", ServiceName, sc.Status.ToString());
        //        }
        //        catch (InvalidOperationException e)
        //        {
        //            Console.WriteLine("Could not stop the {0} service.", ServiceName);
        //            Console.WriteLine(e.Message);
        //        }
        //    }
        //    else
        //    {
        //        Console.WriteLine("Cannot stop service {0} because it's already inactive.", ServiceName);
        //    }
        //}

        //public bool IsServiceRunning(string ServiceName)
        //{
        //    ServiceController sc = new ServiceController();
        //    sc.ServiceName = ServiceName;

        //    if (sc.Status == ServiceControllerStatus.Running)
        //    {
        //        return true;
        //    }
        //    else
        //    {
        //        return false;
        //    }
        //}
        //#endregion

        #region MainForm
        private MessageBuss msgBuss;
        private SMSmanager sms;
        private PingThread pingThread;
        
        private Gateway currentGateway = null;

        UInt32 callOutNumber = 1;
        byte cm_msg_id = 1;

        public void MainForm()
        {
            Version v = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            Utils.WriteEventLog(Program.COMPANY, "Version: " + v.ToString() +Environment.NewLine +
                "SDR gateway. SafeMobile 2012-2017", EventLogEntryType.Information, (int)EventId.EVENT_SDR);
                        
            ConfigurationManager.AppSettings.Set("SDR_Autoconnect", "true");

        }

        void pingThread_OnNewPingComplete(bool status, string ip)
        {
            if (status)
            {
                Utils.WriteLine("Ping to " + ip + " succeded");
            }
            else
            {
                Utils.WriteLine("Ping to " + ip + " failed");
            }
        }


        /// <summary>
        /// Verify if an IP address is a valid IP address
        /// </summary>
        /// <param name="ip">IP which needs to be checked</param>
        /// <returns>True if the email is a valid one, or false otherwise</returns>
        bool IsValidIP(string ip)
        {
            Match match = Regex.Match(ip, @"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}");
            return match.Success;
        }
        

        delegate void PropertyChangedCallback(SDR.SDR_STATUS register);
        void SDRConnector_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            Utils.WriteEventLog(Program.COMPANY, "New value for radio status: " + ((SDR)sender).registered, EventLogEntryType.Information, (int)EventId.EVENT_SDR);
        }


        private async void Register(bool registered)
        {
            RegistrationResponse regResponse = await RegistrationHelper.RegisterGateway(ConfigHelper.ServerIP, ConfigHelper.RegPort);
            // raise event for registration completed
            OnRegistrationCompleted?.Invoke(regResponse);
        }

        #region REGISTRATION HANDLER
        private void OnRegistrationResponseHandler(RegistrationResponse regResponse)
        {
            switch (regResponse.RegistrationStatus)
            {
                case RegistrationCode.ServerUnreachable:
                    onRegistrationServerUnreachable();
                    break;
                case RegistrationCode.Unauthorized:
                    onRegistraionUnauthorized();
                    break;
                case RegistrationCode.Registered:
                    onRegistrationCompleted(regResponse);
                    registered = true;
                    break;

            }
        }
        //need to add a way to reconnect.
        private void onRegistrationServerUnreachable()
        {
            Utils.WriteEventLog(Program.COMPANY, "Application Server is unreachable. Please check internet connection and the application server IP in the configuration file.", EventLogEntryType.Error, (int)EventId.EVENT_SDR);
            if(!ServiceControlUtils.IsServiceRunning("AppServerService"))
                ServiceControlUtils.startService("AppServerService");
            registered = false;
        }
        //need to add a way to reconnect.
        private void onRegistraionUnauthorized()
        {
            Utils.WriteEventLog(Program.COMPANY, "Please register this gateway in the admin module.", EventLogEntryType.Error, (int)EventId.EVENT_SDR);
            registered = false;
        }
                

        private void onRegistrationCompleted(RegistrationResponse response)
        {
            String currentIP = "127.0.0.1";

            // this gateway is on other computer than the application server is
            if (!ConfigHelper.ServerIP.Equals("127.0.0.1"))
                currentIP = RegistrationHelper.GatewayIP;

            // update values for Message bus, database received from AppServer 
            ConfigurationManager.AppSettings.Set("dbIP", response.DataBaseServerIP);
            ConfigurationManager.AppSettings.Set("dbPassword", response.DataBasePassword);
            ConfigurationManager.AppSettings.Set("dbPort", response.DataBasePort.ToString());
            ConfigurationManager.AppSettings.Set("dbSchema", response.DataBaseName);
            ConfigurationManager.AppSettings.Set("dbUser", response.DataBaseUser);
            ConfigurationManager.AppSettings.Set("busIP", response.MessageBusIP);
            ConfigurationManager.AppSettings.Set("busPort", response.MessageBusPort.ToString());

            DBgatewaysManager gatewayManager = new DBgatewaysManager(ConfigHelper.DBip, ConfigHelper.DBSchema,
               ConfigHelper.DBUser, ConfigHelper.DBPassword, ConfigHelper.DBPort);

            // get current gateway
            currentGateway = getGateway(currentIP, gatewayManager);

            List<RadioGateway> radioGws = getRadioGWsFromDB(currentGateway.Id, gatewayManager);

            // check if any sdr gateway is defined
            if (radioGws.Count == 0)
            {
                onNoRadioGatewayDefined();
                return;
            }
            else
            {
                RadioGateway currentRadioGw = radioGws[0];
                // search for radioGws with same identifier as this gateway
                foreach (RadioGateway rg in radioGws)
                {
                    if (rg.Name.ToLower().Equals(ConfigHelper.GatewayName.ToLower()))
                    {
                        currentRadioGw = rg;
                        break;
                    }
                }

                // update values for current gateway
                ConfigurationManager.AppSettings.Set("SDR_ISSI", currentRadioGw.Imei.ToString());
                ConfigurationManager.AppSettings.Set("SDR_IP", currentRadioGw.Ip);

                // remove all others gateways from the list
                radioGws.Clear();
                radioGws.Add(currentRadioGw);
            }

            if (ConfigHelper.SdrPing > 0)
            {
                pingThread = new PingThread(ConfigHelper.SdrIp, ConfigHelper.SdrPing);

                pingThread.OnNewPingComplete += new PingThread.NewPingCompleteDEl(pingThread_OnNewPingComplete);
            }

            Utils.WriteEventLog(Program.COMPANY, "Starting application.", EventLogEntryType.Information, (int)EventId.EVENT_SDR);
            SDRConnector = new SDR();
            


            // set if the message needs to be stored on the server and resent once at X seconds
            SDRConnector.setStoreAndForwardOption(ConfigHelper.SdrStoreTM == 1 ? true : false);
            SDRConnector.PropertyChanged += new PropertyChangedEventHandler(SDRConnector_PropertyChanged);
            //SDRConnector.Start();
            msgBuss = new MessageBuss(ConfigHelper.MsgBusIp, ConfigHelper.MsgBusPort.ToString(), SDRConnector);
            msgBuss.OnPollRequest += delegate (Int64 radioID, bool isLong, string seqNumber)
            {
                SDRConnector.Send_Imed_Loc_req((UInt32)radioID, isLong, seqNumber);
            };

            msgBuss.OnSDSRequest += delegate (Int64 radioID, Int64 gatewayID, Int64 gatewayRadioID, string message, int type, string seqID)
            {
                SDRConnector.SEND_SMS((uint)radioID, message);
                
                Utils.WriteEventLog(Program.COMPANY, "SMSConfirm.getFromConfirmationQueue(hret.seq_no)=" + seqID, EventLogEntryType.Information, (int)EventId.EVENT_SDR);
                string test = "#242#1#";

                //send SMS ack to message bus
                MessageBuss.SendOnMsgBuss(seqID, test);
            };
            msgBuss.OnUnitsUpdated += delegate ()
            {
                DBvehiclesManager dbVehManager = new DBvehiclesManager(ConfigHelper.DBip, ConfigHelper.DBSchema, ConfigHelper.DBUser, ConfigHelper.DBPassword, ConfigHelper.DBPort);

                try
                {
                    lock (SDR.dictionaryLock)
                    {
                        SDR.RadioIdToLastPosDictionary = dbVehManager.getImeiLastPosDictionary(true);
                        Utils.WriteEventLog(Program.COMPANY, "Received " + SDR.RadioIdToLastPosDictionary.Count + " units", EventLogEntryType.Information, (int)EventId.EVENT_SDR);
                        StringBuilder sb = new StringBuilder();
                        foreach (var item in SDR.RadioIdToLastPosDictionary)
                        {
                            sb.AppendFormat("{0:#############}, ", item.Key);
                            //Utils.Write(String.Format("{0:#############}      |||| ", item.Key), ConsoleType.ALL);
                        }
                        string result = sb.ToString().TrimEnd();//when converting to string we also want to trim the redundant new line at the very end
                        Utils.WriteEventLog(Program.COMPANY ,result, EventLogEntryType.Information, (int)EventId.EVENT_SDR);
                    }
                }
                catch (Exception ex)
                {
                    Utils.WriteEventLog(Program.COMPANY, "Unable to get assigned units " + ex.ToString(), EventLogEntryType.Error, (int)EventId.EVENT_SDR);
                }
            };
            msgBuss.OnCallOutRequest += delegate (ulong destISSI, ushort callOutSeverity, string GeoName)
            {
                SDRConnector.SendCallOut((uint)destISSI, callOutSeverity, GeoName);
            };
            msgBuss.OnCallOutStopRequest += delegate (ulong destISSI, ushort callOutSeverity)
            {
                SDRConnector.SendCallOutStop((uint)destISSI, callOutSeverity);
            };

            

            sms = new SMSmanager(SDRConnector);

            if (ConfigHelper.HasSdrAutoconnect)
                SDRConnector.Start();

        }



        #endregion

        #region GATEWAY - RADIO GATEWAY

        private Gateway getGateway(String gatewayIP, DBgatewaysManager gatewayManager)
        {
            List<Gateway> allGateways = gatewayManager.getAllGateways();

            foreach (Gateway g in allGateways)
            {
                if (g.Ip == gatewayIP)
                {
                    Utils.WriteEventLog(Program.COMPANY, "Gateway IP found in registration tabel. ID: " + g.Id, EventLogEntryType.Information, (int)EventId.EVENT_SDR);
                    currentGateway = g;
                    ConfigurationManager.AppSettings.Set("id", g.Id.ToString());
                    ConfigurationManager.AppSettings.Set("thisIP", g.Ip.ToString());

                    // TODO update thegateway infos in the config file
                    return g;
                }
            }
            return null;
        }

        private List<RadioGateway> getRadioGWsFromDB(Int64 gatewayID, DBgatewaysManager gatewayManager)
        {

            List<RadioGateway> list = gatewayManager.gelAllRadioGateways(gatewayID);
            List<RadioGateway> listtoreturn = new List<RadioGateway>();
            foreach (RadioGateway g in list)
                listtoreturn.Add(g);

            return listtoreturn;
        }


        private void onNoRadioGatewayDefined()
        {
            Utils.WriteEventLog(Program.COMPANY, "No SDR controller defined in the admin module for this computer. Please contact your administrator.",
                EventLogEntryType.Error, (int)EventId.EVENT_SDR);
        }
        #endregion

        private void CloseApp()
        {
            OnStop();
        }


        #region EVENTS
        public delegate void RegistrationCompleted(RegistrationResponse response);
        public event RegistrationCompleted OnRegistrationCompleted;
        #endregion

        

    }
    #endregion

}