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using System;
using System.Text.RegularExpressions;
using System.Xml;
using NLog;
using static MeasurementManagerLib.SwitchMeasurementManager;

namespace ProgramLib
{
   /// <summary>
   /// Class that manages anything to do with Special Test Equipment (STE)
   /// </summary>
   internal class TestStation
   {
      #region PrivateClassMembers
      private static NLog.ILogger _logger;

      #endregion

      public TestStation()
      {
         _logger = LogManager.GetCurrentClassLogger();

         Program.Instance().InitializeSwitchMeasurementManager();
      }

      /// <summary>
      /// Perform cable checks
      /// </summary>
      /// <param name="name"></param>
      /// <returns></returns>
      public void PerformCableChecks()
      {
         try
         {
            if (Program.Instance().IsThereHardware)
            {
               if (Program.Instance().UutInfo.UniversalCableId == UutInfo.UniversalCable.NOT_SET)
               {
                  if (CableCheck(ProgramSpecificConfigIni.W1_CABLE_PART_NUMBER.ToString()))
                  {
                     Program.Instance().UutInfo.UniversalCableId = UutInfo.UniversalCable.W1;
                     CableCheck(ProgramSpecificConfigIni.W1_CABLE_SERIAL_NUMBER.ToString());
                  }
               }

               if (Program.Instance().UutInfo.UniversalCableId == UutInfo.UniversalCable.NOT_SET)
               {
                  if (CableCheck(ProgramSpecificConfigIni.W2_CABLE_PART_NUMBER.ToString()))
                  {
                     Program.Instance().UutInfo.UniversalCableId = UutInfo.UniversalCable.W2;
                     CableCheck(ProgramSpecificConfigIni.W2_CABLE_SERIAL_NUMBER.ToString());
                  }
               }

               if (Program.Instance().UutInfo.UniversalCableId == UutInfo.UniversalCable.NOT_SET)
               {
                  throw new Exception($"Universal cable ({UutInfo.UniversalCable.W1.ToString()}/{UutInfo.UniversalCable.W2.ToString()}) is not connected.");
               }

               // check if UUT is SELF_TEST Cable
               if (Program.Instance().UutInfo.UutBuildLevel == UutInfo.BuildLevel.NOT_SET)
               {
                  if (CableCheck(ProgramSpecificConfigIni.W5_CABLE_PART_NUMBER.ToString()))
                  {
                     Program.Instance().UutInfo.UutBuildLevel = UutInfo.BuildLevel.SELF_TEST;
                     CableCheck(ProgramSpecificConfigIni.W5_CABLE_SERIAL_NUMBER.ToString());
                  }
               }

               // check for W3 Cable
               if (CableCheck(ProgramSpecificConfigIni.W3_CABLE_PART_NUMBER.ToString()))
               {
                  CableCheck(ProgramSpecificConfigIni.W3_CABLE_SERIAL_NUMBER.ToString());
                  if (Program.Instance().UutInfo.UutBuildLevel != UutInfo.BuildLevel.SELF_TEST)
                  {
                     Program.Instance().UutInfo.UutBuildLevel = UutInfo.BuildLevel.GMA;
                  }
                  Program.Instance().UutInfo.SacrificialCableId = UutInfo.SacrificialCable.W3;
               }

               // check for W4 Cable
               if (Program.Instance().UutInfo.SacrificialCableId == UutInfo.SacrificialCable.NOT_SET)
               {
                  if (CableCheck(ProgramSpecificConfigIni.W4_CABLE_PART_NUMBER.ToString()))
                  {
                     CableCheck(ProgramSpecificConfigIni.W4_CABLE_SERIAL_NUMBER.ToString());
                     if (Program.Instance().UutInfo.UutBuildLevel != UutInfo.BuildLevel.SELF_TEST)
                     {
                        Program.Instance().UutInfo.UutBuildLevel = UutInfo.BuildLevel.AUR;
                     }
                     Program.Instance().UutInfo.SacrificialCableId = UutInfo.SacrificialCable.W4;
                  }
               }

               if (Program.Instance().UutInfo.SacrificialCableId == UutInfo.SacrificialCable.NOT_SET)
               {
                  throw new Exception($"Sacrificial cable ({UutInfo.SacrificialCable.W3.ToString()}/{UutInfo.SacrificialCable.W4.ToString()}) is not connected.");
               }
            }
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// Verify if cable self test has been run
      /// </summary>
      public bool VerifyCableSelfTestHasRun()
      {
         bool enforceSelfTestHasRun = false;

         try
         {
            string val = Program.Instance().ProgramSpecificConfig.ReadValue(ProgramSpecificConfigIni.GENERAL.ToString(), ProgramSpecificConfigIni.ENFORCE_CABLE_SELF_TEST_IS_RUN.ToString());

            if (String.Equals(val, "true", StringComparison.OrdinalIgnoreCase))
            {
               enforceSelfTestHasRun = true;
            }
         }
         catch (Exception) { }

         if (enforceSelfTestHasRun)
         {
            if (!Program.Instance().CableSelfTestHasRun && Program.Instance().IsThereHardware)
            {
               if (Program.Instance().UutInfo.UutBuildLevel != UutInfo.BuildLevel.SELF_TEST)
               {
                  if (Program.Instance().UutInfo.UniversalCableId != UutInfo.UniversalCable.NOT_SET
                         && Program.Instance().UutInfo.SacrificialCableId != UutInfo.SacrificialCable.NOT_SET)
                  {
                     XmlDocumentWrapper doc = new XmlDocumentWrapper(Program.Instance().FileAndFolderManager.GetFile(FileAndFolderManager.Files.CABLE_SELF_TEST_RUN_LOG));
                     XmlNode node = doc.GetNode(CableSelfTestConfigXml.SelfTestPath);

                     bool selfTestAlreadyRanToday = false;
                     while (node != null)
                     {
                        if (node.Attributes[CableSelfTestConfigXml.UniversalCableAttributeName] != null && String.Equals(node.Attributes[CableSelfTestConfigXml.UniversalCableAttributeName].Value, Program.Instance().UutInfo.UniversalCableId.ToString(), StringComparison.OrdinalIgnoreCase)
                           && node.Attributes[CableSelfTestConfigXml.SacrificialCableAttributeName] != null && String.Equals(node.Attributes[CableSelfTestConfigXml.SacrificialCableAttributeName].Value, Program.Instance().UutInfo.SacrificialCableId.ToString(), StringComparison.OrdinalIgnoreCase)
                           && node.Attributes[CableSelfTestConfigXml.LastRunDateAttributeName] != null)
                        {

                           string lastRunDateStr = node.Attributes[CableSelfTestConfigXml.LastRunDateAttributeName].Value;

                           DateTime lastRunDate = DateTime.Parse(lastRunDateStr);

                           if (lastRunDate == DateTime.Now.Date)
                              selfTestAlreadyRanToday = true;

                           break;
                        }
                        node = node.NextSibling;
                     }

                     if (!selfTestAlreadyRanToday)
                     {
                        throw new Exception($"Please run self-test on cables {Program.Instance().UutInfo.UniversalCableId} + {Program.Instance().UutInfo.SacrificialCableId}.");
                     }
                  }
                  else
                     throw new Exception("Please perform cable checks before cable self-test enforcement can begin.");
               }
               else
                  Program.Instance().CableSelfTestHasRun = true;
            }
            else
               Program.Instance().CableSelfTestHasRun = true;
         }
         else
            Program.Instance().CableSelfTestHasRun = true;


         return Program.Instance().CableSelfTestHasRun;
      }

      /// <summary>
      /// Verify cable id
      /// </summary>
      /// <param name="name"></param>
      /// <returns></returns>
      private bool CableCheck(string iniRelayKeyName)
      {
         bool checkPass = false;

         string relayName = Program.Instance().ProgramSpecificConfig.ReadValue(ProgramSpecificConfigIni.CABLE_ID_RELAYS.ToString(), iniRelayKeyName);

         DMMResistanceMeasurementFields dmmResistanceMeasurementInfo = Program.Instance().MalMeasurementLibManager.SwitchMeasurementManager.DmmResistanceMeasurements[relayName];
         double testResult = Program.Instance().MalMeasurementLibManager.SwitchMeasurementManager.DmmReadResistance(relayName);

         string cableAndPinId = dmmResistanceMeasurementInfo._cableAndPinId;
         if (Program.Instance().UutInfo.UniversalCableId == UutInfo.UniversalCable.W2 || Regex.IsMatch(relayName, UutInfo.UniversalCable.W2.ToString() + @"_", RegexOptions.IgnoreCase))
            cableAndPinId = Regex.Replace(cableAndPinId, UutInfo.UniversalCable.W1.ToString() + @"_", UutInfo.UniversalCable.W2.ToString() + @"_", RegexOptions.IgnoreCase);
         string description = $"{relayName}, {cableAndPinId} Measured {Util.AutoFormatNumberToString(testResult)} Range [{Util.AutoFormatNumberToString(dmmResistanceMeasurementInfo._lowerLimit)}, {Util.AutoFormatNumberToString(dmmResistanceMeasurementInfo._upperLimit)}]";
         _logger.Info(description);
         if (testResult >= dmmResistanceMeasurementInfo._lowerLimit && testResult <= dmmResistanceMeasurementInfo._upperLimit)
         {
            checkPass = true;
         }

         return checkPass;
      }
   }
}