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using Raytheon.Common;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Raytheon.MeasurementManager.PowerSupply
{
   /// <summary>
	/// Define non-specific constants
	/// </summary>
   internal static class Util
   {
      /// <summary>
      /// Read from the XML file the time for this power system
      /// If time of power off is available, we return this time
      /// If time of last self test run is available, we return this time
      /// </summary>
      /// <param name="name"></param>
      /// <returns></returns>
      public static string GetLastSavedTime(string powerSystem, IConfigurationFile powerOffAndSelfTestConfig)
      {
         string savedTime = "";
         string powerOffTime = "";
         string selfTestTime = "";

         List<PowerSupplySelfTestTime> powerOffEntryListTemp = new List<PowerSupplySelfTestTime>();

         List<PowerSupplySelfTestTime> powerOffEntryList = powerOffAndSelfTestConfig.ReadList<PowerSupplySelfTestTime>(nameof(PowerSupplySelfTestTime), nameof(PowerSupplySelfTestTime), powerOffEntryListTemp);

         foreach (var powerOffEntry in powerOffEntryList)
         {
            if (powerOffEntry._powerSystem == powerSystem)
            {
               if (DateTime.TryParse(powerOffEntry._powerOffTime, out DateTime dt))
                  powerOffTime = powerOffEntry._powerOffTime;
               
               if (DateTime.TryParse(powerOffEntry._selfTestTime, out dt))
                  selfTestTime = powerOffEntry._selfTestTime;
            }
         }

         if (String.IsNullOrEmpty(powerOffTime))
            savedTime = selfTestTime;
         else if (String.IsNullOrEmpty(selfTestTime))
            savedTime = powerOffTime;
         else if (!String.IsNullOrEmpty(powerOffTime) && !String.IsNullOrEmpty(selfTestTime))
         {
            if (DateTime.TryParse(powerOffTime, out DateTime powerOffDt) && DateTime.TryParse(selfTestTime, out DateTime selfTestDt))
            {
               if (DateTime.Compare(powerOffDt, selfTestDt) == 1)
                  savedTime = powerOffTime;
               else
                  savedTime = selfTestTime;
            }
         }

         return savedTime;
      }

      /// <summary>
      /// Save time of power off or self test event
      /// </summary>
      /// <param name="name"></param>
      /// <returns></returns>
      public static void SaveTime(string powerSystem, string powerOffTime, string selfTestTime, IConfigurationFile powerOffAndSelfTestConfig)
      {
         List<PowerSupplySelfTestTime> powerOffEntryListTemp = new List<PowerSupplySelfTestTime>();

         List<PowerSupplySelfTestTime> powerOffEntryList = powerOffAndSelfTestConfig.ReadList<PowerSupplySelfTestTime>(nameof(PowerSupplySelfTestTime), nameof(PowerSupplySelfTestTime), powerOffEntryListTemp);

         var entry = powerOffEntryList.Find(b => b._powerSystem == powerSystem);

         if (entry != null)
         {
            if (!string.IsNullOrEmpty(powerOffTime))
               entry._powerOffTime = powerOffTime;

            if (!string.IsNullOrEmpty(selfTestTime))
               entry._selfTestTime = selfTestTime;
         }
         else
         {
            PowerSupplySelfTestTime data = new PowerSupplySelfTestTime(powerSystem, powerOffTime, selfTestTime);
            if (string.IsNullOrEmpty(powerOffTime))
               data._powerOffTime = Raytheon.Common.GeneralConstants.DefaultConfigValue;

            if (string.IsNullOrEmpty(selfTestTime))
               data._selfTestTime = Raytheon.Common.GeneralConstants.DefaultConfigValue;

            powerOffEntryList.Add(data);
         }

         powerOffAndSelfTestConfig.WriteList(nameof(PowerSupplySelfTestTime), nameof(PowerSupplySelfTestTime), powerOffEntryList);
      }
   }
}