using CMS_CORE_Library.Models;
using Step.NC;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using TeamDev.SDK.MVVM;
using static CMS_CORE_Library.Models.DataStructures;
using static Step.Config.ServerConfig;
using static Step.Model.Constants;
using static Step.Utils.ExceptionManager;

namespace Step.Core
{
    internal static class ThreadsSupportFunctions
    {
        public static bool reconnectionIsRunning = false;

        private static ConcurrentDictionary<string, long> Timers = new ConcurrentDictionary<string, long>();
        private static ConcurrentDictionary<string, long> Counter = new ConcurrentDictionary<string, long>();

        private static Thread ConnThread;

        #region SupportFunctions

        internal static void TryNcConnection()
        {
            // Stop all the NC threads
            ThreadsHandler.Stop();
            StatReset();
            NcAdapter ncAdapter = new NcAdapter();
            CmsError cmsError = NO_ERROR;
            // Run loop until NC is connected
            while (!ncAdapter.numericalControl.NC_IsConnected())
            {
                // Try reconnection
                cmsError = ncAdapter.Connect();
                if (cmsError.errorCode == CMS_ERROR_CODES.SIEMENS_ENVIRONMENT_NOT_FOUND || cmsError.errorCode == CMS_ERROR_CODES.SIEMENS_HMI_NOT_RUNNING || cmsError.errorCode == CMS_ERROR_CODES.OSAI_TT_FOLDER_NOT_FOUND)
                    ManageLibraryError(cmsError);
                else if (cmsError.errorCode != CMS_ERROR_CODES.OK)
                {
                    ncAdapter.Dispose();
                }

                if (cmsError.errorCode == CMS_ERROR_CODES.SIEMENS_TOOL_TABLE_ERROR)
                    ManageLibraryError(cmsError);

                // Send status to UI
                MessageServices.Current.Publish(SEND_NC_STATUS, null, ncAdapter.numericalControl.NC_IsConnected());

                Thread.Sleep(1000);
            }


            if (NcConfig.NcVendor == NC_VENDOR.FANUC || NcConfig.NcVendor == NC_VENDOR.OSAI)
            {
                using (NcToolTableAdapter toolTable = new NcToolTableAdapter())
                {
                    toolTable.Connect();
                    // After reconecction write option
                    cmsError = toolTable.SetupNcToolManager();
                    if (cmsError.IsError())
                        ManageLibraryError(cmsError);
                    // cmsError = toolTable.RestoreTableLock();
                }
            }
            if (!cmsError.IsError())
            {
                if (ServerStartupConfig.AutoOpenCmsClient)
                    StartCMSClient();

                // Start/Restart NC threads
                ThreadsHandler.StartWorkers();
                reconnectionIsRunning = false;
            }
        }

        internal static void RestoreConnection()
        {
            if (reconnectionIsRunning == false)
            {   // Set thread as running state
                reconnectionIsRunning = true;

                // Start reconnection thread
                ConnThread = new Thread(() =>
                            TryNcConnection()
                );

                ConnThread.Start();
            }
        }

        internal static void AbortNcConnection()
        {
            if (ConnThread != null && ConnThread.IsAlive)
                ConnThread.Abort();
        }

        internal static void ManageLibraryError(CmsError cmsError)
        {
            switch (cmsError.errorCode)
            {
                case CMS_ERROR_CODES.NC_PROD_ERROR:
                    ManageError(ERROR_LEVEL.WARNING, cmsError.localizationKey);
                    break;

                case CMS_ERROR_CODES.NOT_CONNECTED:
                    RestoreConnection(); // If not connected try reconnection
                    break;

                case CMS_ERROR_CODES.SIEMENS_ENVIRONMENT_NOT_FOUND:
                case CMS_ERROR_CODES.OSAI_TT_FOLDER_NOT_FOUND:
                case CMS_ERROR_CODES.OPTION_NOT_CONSISTENT:
                case CMS_ERROR_CODES.SIEMENS_TOOL_TABLE_ERROR:
                    ManageError(ERROR_LEVEL.FATAL, cmsError.localizationKey);
                    break;

                case CMS_ERROR_CODES.SIEMENS_HMI_NOT_RUNNING:
                    ManageError(ERROR_LEVEL.FATAL, "SIEMENS HMI NOT RUNNING");
                    break;

                case CMS_ERROR_CODES.SELECTED_PROCESS:
                    ManageError(ERROR_LEVEL.WARNING, cmsError.localizationKey);
                    break;

                case CMS_ERROR_CODES.INTERNAL_ERROR:
                    ManageException(ERROR_LEVEL.FATAL, cmsError.exception);
                    break;
            }
        }

        internal static void UpdateStat(string functionName, long timer)
        {
            if (!Timers.ContainsKey(functionName))
                Timers.TryAdd(functionName, timer);
            else
                Timers[functionName] += timer;


            if (!Counter.ContainsKey(functionName))
                Counter.TryAdd(functionName, 1);
            else
                Counter[functionName]++;
        }

        internal static void StatThread()
        {
            while (true)
            {
                foreach (var value in Counter)
                {
                    if (ThreadsHandler.RunningThreadStatus.ContainsKey(value.Key) && Counter[value.Key] != 0)
                    {
                        ThreadsHandler.RunningThreadStatus[value.Key] = (Timers[value.Key] / Counter[value.Key]) + " mS";
                        Timers[value.Key] = 0;
                        Counter[value.Key] = 0;
                    }
                }

                MessageServices.Current.Publish(SEND_THREADS_STATUS, null, ThreadsHandler.RunningThreadStatus);

                Thread.Sleep(2000);
            }
        }

        private static void StatReset()
        {
            foreach (var value in Counter)
            {
                Timers[value.Key] = 0;
                Counter[value.Key] = 0;
            }
        }

        internal static int CalcSleepTime(int maxSleep, int execTime)
        {
            int sleep = 0;
            // Check if the execution time is greater than the half of the max sleep time
            if (maxSleep - execTime < maxSleep / 2)
            {
                sleep = maxSleep;
            }
            else
            {
                sleep = maxSleep - execTime;
            }

            return sleep;
        }

        internal static void StartCMSClient()
        {
            //Setup the Path Variable
            if (!ClientIsRunning())
            {

                ThreadsHandler.StartClient = new Thread(() => clientProcess());
                ThreadsHandler.StartClient.Start();
            }
        }

        private static void clientProcess()
        {
            string CMSClientPath = "";
            // Check if the system is 64/32 bit
            if (Environment.Is64BitOperatingSystem && File.Exists(CLIENT_PATH_64))
                CMSClientPath = CLIENT_PATH_64;
            else if (File.Exists(CLIENT_PATH_86))
                CMSClientPath = CLIENT_PATH_86;

            if (!String.IsNullOrEmpty(CMSClientPath))
            {
                Process pr = Process.Start(CMSClientPath, null);

                if (ServerStartupConfig.AutoOpenCmsClient)
                {
                    pr.WaitForExit();
                    MessageServices.Current.Publish(SEND_STOP_SERVER);
                }
            }
        }

        private static bool ClientIsRunning()
        {
            Process[] p = Process.GetProcessesByName(CLIENT_EXE_NAME_NOEXT);
            foreach (Process pr in p)
            {
                if (pr.MainWindowHandle != IntPtr.Zero)
                {
                    ShowWindow(pr.MainWindowHandle, 9);
                    SetForegroundWindow(pr.MainWindowHandle);
                    return true;
                }
            }
            return false;
        }

        internal static Dictionary<string, string> GetPlcAlarmsTranslations(string language)
        {
            using (NcAdapter ncAdapter = new NcAdapter())
            {
                Dictionary<string, string> returnValue = new Dictionary<string, string>();

                Dictionary<int, string> messages = new Dictionary<int, string>();
                // Read data from CN
                ncAdapter.numericalControl.NC_GetTranslatedPlcMessages(language, ref messages); // Avoid checking error because in the worst case "messages" is empty

                // Id start from 1
                for (int i = 1; i <= 1024; i++)
                {
                    // Get configurated alarms
                    var tmpAlarmConfig = InitialAlarmsConfig.Where(x => x.PlcId == i).FirstOrDefault();
                    // Default string
                    string message = string.Format(NOT_CONFIGURATED_ALARM_MESSAGE, i);
                    // If is configurated
                    if (tmpAlarmConfig != null)
                    {
                        // Find translated string
                        message = messages.Where(x => x.Key == tmpAlarmConfig.AlarmId).FirstOrDefault().Value;
                        if (message == null)
                            message = string.Format(NOT_FOUND_ALARM_MESSAGE, i);
                    }
                    // Add to dictionary
                    returnValue.Add(i.ToString("D6") + "|900", message);
                }
                return returnValue;
            }
        }


        [DllImport("user32.dll")]
        static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        #endregion SupportFunctions
    }
}