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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using NLog;
using ProgramLib.GUI.Model;
using ProgramLib.GUI.View;

namespace ProgramLib
{
   /// <summary>
   /// Class to spawn thread to update power supply data on GUI
   /// </summary>
   internal class PowerSupplyUpdateThread : BasicThread
   {
      private enum Events
      {
         GLOBAL_QUIT,
         QUIT,
         UUT_POWER_ON,
         UUT_POWER_OFF,

         // DO NOT change the name
         // This must be the last member in the enum
         EVENT_TIMED_OUT
      }

      private ILogger _logger;
      private LiveDataWindow _liveDataWindow;

      private Dictionary<string, PowerModuleDataModel> _powerModuleToPowerDataModelDict = new Dictionary<string, PowerModuleDataModel>(StringComparer.OrdinalIgnoreCase);
      int _pollRateMs;
      private StreamWriter _fileWriter;
      private List<string> _powerModulesToBeDisplayed = new List<string>();
      private string _logNamePrefix;
      private string _logFileExtension;

      /// <summary>
      /// Constructor
      /// </summary>
      public PowerSupplyUpdateThread(int pollRateMs, string logNamePrefix, string logFileExtension)
      {
         try
         {
            _logger = LogManager.GetCurrentClassLogger();

            _pollRateMs = pollRateMs;

            _logNamePrefix = logNamePrefix;

            _logFileExtension = logFileExtension;

            _liveDataWindow = (LiveDataWindow)ProgramLib.Program.Instance().GuiManager[ProgramGuiManager.WINDOWS.LIVE_DATA];

            ParseConfig();

            foreach (string powerModule in _powerModulesToBeDisplayed)
            {
               if (!_powerModuleToPowerDataModelDict.ContainsKey(powerModule))
               {
                  _powerModuleToPowerDataModelDict[powerModule] = new PowerModuleDataModel();
                  _powerModuleToPowerDataModelDict[powerModule].Name = powerModule;
                  _liveDataWindow.Dispatcher.Invoke((Action)delegate
                  {
                     _liveDataWindow.LiveDataWindowViewModel.AddPowerData(_powerModuleToPowerDataModelDict[powerModule]);
                  });
               }
            }
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// Method that executes on the thread.
      /// </summary>
      /// <param name=""></param>
      /// <returns></returns>
      protected override void DoWork()
      {
         _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is running...");

         try
         {
            Dictionary<Events, EventWaitHandle> eventDict = new Dictionary<Events, EventWaitHandle>();
            eventDict[Events.GLOBAL_QUIT] = Program.Instance().EventManager[EventManager.Events.GLOBAL_QUIT];
            eventDict[Events.QUIT] = _quitEvent;
            eventDict[Events.UUT_POWER_ON] = Program.Instance().EventManager[EventManager.Events.UUT_POWER_ON];
            eventDict[Events.EVENT_TIMED_OUT] = null;

            EventGroup<Events, EventWaitHandle> eventGroup = new EventGroup<Events, EventWaitHandle>(eventDict);

            while (true)
            {
               Events id = eventGroup.WaitAny();

               if (id == Events.UUT_POWER_ON)
               {
                  UpdatePowerSupplyData();
               }
               else
                  break;
            }
         }
         catch (Exception ex)
         {
            _logger?.Error(ex.Message + "\n" + ex.StackTrace);
         }

         _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is exiting...");

      }

      /// <summary>
      /// Log and update GUI with power supply data
      /// </summary>
      /// <param name=""></param>
      /// <returns></returns>
      private void UpdatePowerSupplyData()
      {
         _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is running...");

         try
         {
            Dictionary<Events, EventWaitHandle> eventDict = new Dictionary<Events, EventWaitHandle>();
            eventDict[Events.GLOBAL_QUIT] = Program.Instance().EventManager[EventManager.Events.GLOBAL_QUIT];
            eventDict[Events.QUIT] = _quitEvent;
            eventDict[Events.UUT_POWER_OFF] = Program.Instance().EventManager[EventManager.Events.UUT_POWER_OFF];
            eventDict[Events.EVENT_TIMED_OUT] = null;

            EventGroup<Events, EventWaitHandle> eventGroup = new EventGroup<Events, EventWaitHandle>(eventDict);

            const string LOG_PREFIX = "DateTime,Module,Voltage,VoltageSetpoint,Current,IsOutputOn";
            string logFilePath = Path.Combine(Program.Instance().FileAndFolderManager.GetFolder(FileAndFolderManager.Folders.DATA_TEST), Util.GenerateUniqueFilenameUsingDateTime(_logNamePrefix, _logFileExtension));
            _fileWriter = new StreamWriter(logFilePath);
            _fileWriter.Write(LOG_PREFIX);
            _fileWriter.Flush();

            while (true)
            {
               Events id = eventGroup.WaitAny(_pollRateMs);

               if (id == Events.EVENT_TIMED_OUT)
               {
                  string logText = String.Empty;
                  foreach (string powerModule in Program.Instance().PowerSupplySharedData.GetAllPowerModules())
                  {
                     PowerSupplyData data = Program.Instance().PowerSupplySharedData.GetData(powerModule);

                     if (data != null && data.Initialized)
                     {
                        if (_powerModuleToPowerDataModelDict.ContainsKey(powerModule))
                        {
                           _powerModuleToPowerDataModelDict[powerModule].ActualVoltage = data.Voltage.ToString("0.00");
                           _powerModuleToPowerDataModelDict[powerModule].ExpectedVoltage = data.PowerSupplyModuleInfo.voltageSetpoint_.ToString("0.00");
                           _powerModuleToPowerDataModelDict[powerModule].ActualCurrent = data.Current.ToString("0.00");
                        }
                     }

                     if (!String.IsNullOrEmpty(logText))
                        logText += "\r\n";

                     logText += DateTime.Now.ToString("yyyy_MM_dd") + "_" + DateTime.Now.ToString("HH_mm_ss") + "," + powerModule + "," + data.Voltage.ToString("0.00") +
                                   "," + data.PowerSupplyModuleInfo.voltageSetpoint_.ToString("0.00") + "," + data.Current.ToString("0.00") + "," + data.PowerSupplyModuleInfo.isOn_.ToString();

                  }

                  // log out the data
                  _fileWriter.WriteLine(logText);
                  _fileWriter.Flush();
               }
               else
                  break;
            }
         }
         catch (Exception)
         {
            throw;
         }
         finally
         {
            if (_fileWriter != null)
            {
               _fileWriter.Flush();
               _fileWriter.Close();
               _fileWriter = null;
            }

            foreach (KeyValuePair<string, PowerModuleDataModel> item in _powerModuleToPowerDataModelDict)
            {
               item.Value.ExpectedVoltage = "";
               item.Value.ActualVoltage = "";
               item.Value.ActualCurrent = "";
            }
         }

         _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is exiting...");
      }

      /// <summary>
		/// Parse ini file
		/// </summary>
		public void ParseConfig()
      {
         try
         {
            List<string> keys = Program.Instance().ProgramSpecificConfig.ReadAllKeys(ProgramSpecificConfigIni.POWER_MODULES_TO_BE_DISPLAYED.ToString());
            foreach (string key in keys)
            {
               string powerSupplyModule = Program.Instance().ProgramSpecificConfig.ReadValue(ProgramSpecificConfigIni.POWER_MODULES_TO_BE_DISPLAYED.ToString(), key);

               if (!_powerModulesToBeDisplayed.Contains(powerSupplyModule, StringComparer.OrdinalIgnoreCase))
                  _powerModulesToBeDisplayed.Add(powerSupplyModule);
            }
         }
         catch (Exception)
         {
            throw;
         }
      }
   }
}