using MarketData.MarketDataModel;
using MarketData.DataAccess;
using MarketData.Utils;

namespace MarketData.Helper
{
  public class CompanyProfileThreadHelper : ThreadHelper
  {
    public CompanyProfile CompanyProfile{get;set;}

		public CompanyProfileThreadHelper()
		{
		}
    public CompanyProfileThreadHelper(CompanyProfile companyProfile, ManualResetEvent resetEvent)
    {
      CompanyProfile=companyProfile;
      ResetEvent=resetEvent;
    }
  }

  public class CompanyProfileMarketDataHelper : MarketDataHelperBase<CompanyProfile>
  {
    private static int MaxThreads = (int)ThreadHelperEnum.MaxThreads;
    private static int SLEEP_TIME_MS = 500;

    public CompanyProfileMarketDataHelper()
    {
    }

    public bool UpdateCompanyProfiles()
		{
		  return UpdateCompanyProfile();
		}

    public bool UpdateCompanyProfile(String symbol=null)
    {
      Profiler profiler=new Profiler();
      try
      {
			  if(null==symbol)
				{
				  Queue=CompanyProfileDA.GetCompanyProfiles();
				}
				else
				{
          CompanyProfile companyProfile=CompanyProfileDA.GetCompanyProfile(symbol);
          if(null==companyProfile)return false;
				  Queue = new CompanyProfile[]{companyProfile}.ToList();
				}
        Index=-1;
        ManualResetEvent[] resetEvents = new ManualResetEvent[MaxThreads];
        for (int eventIndex = 0; eventIndex < resetEvents.Length; eventIndex++)resetEvents[eventIndex] = new ManualResetEvent(true);
        MDTrace.WriteLine(String.Format("Queuing company profile fetches ..."));    
        DateTime modified=DateTime.Now;
        while (true)
        {
          ManualResetEvent[] availableEvents=GetAvailableEvents(resetEvents);
          ManualResetEvent[] busyEvents=GetBusyEvents(resetEvents);
          MDTrace.WriteLine(LogLevel.DEBUG,$"Available:{availableEvents.Length} Busy:{busyEvents.Length}");
          if (null == PeekQueueItem() && 0==busyEvents.Length)
          {
            MDTrace.WriteLine(LogLevel.DEBUG,String.Format("Queue contains {0} items, busy events {1}, all done.",0,busyEvents.Length));
            break;
          }
          for (int index = 0; index < availableEvents.Length; index++)
          {
            CompanyProfile queueItem=GetQueueItem();
            if (null != queueItem)
            {
              availableEvents[index].Reset();
							CompanyProfileThreadHelper companyProfileThreadHelper = new CompanyProfileThreadHelper(queueItem,availableEvents[index]);
							ThreadPool.QueueUserWorkItem(ThreadPoolCallback, companyProfileThreadHelper);
							try { Thread.Sleep(SLEEP_TIME_MS); }catch (Exception) { ;}
            }
            else
            {
              busyEvents=GetBusyEvents(resetEvents);
              if(busyEvents.Length!=availableEvents.Length)
              {
                ManualResetEvent[] resizedEvents=new ManualResetEvent[busyEvents.Length];
                Array.Copy(busyEvents, resizedEvents,busyEvents.Length);
                resetEvents = resizedEvents;
              }
              break;
            }
          }    // for
          MDTrace.WriteLine(LogLevel.DEBUG,"[UpdateCompanyProfile] waiting for free slots...");
          if(resetEvents.Length>0)WaitHandle.WaitAny(resetEvents);
          if(null==PeekQueueItem())resetEvents=ResizeEvents(resetEvents);
        }    // while
        MDTrace.WriteLine(LogLevel.DEBUG,"[UpdateCompanyProfile] completed.");
        return true;
      }
      finally
      {
        MDTrace.WriteLine(LogLevel.DEBUG,String.Format("[UpdateCompanyProfile] End, total took {0}(ms)",profiler.End()));
      }
    }		

    public void ThreadPoolCallback(Object companyProfileThreadHelperContext)
    {
      CompanyProfileThreadHelper companyProfileThreadHelper = (CompanyProfileThreadHelper)companyProfileThreadHelperContext;
      try
      {
        MDTrace.WriteLine(LogLevel.DEBUG,String.Format("[UpdateCompanyProfile] Thread {0} started for {1}...", Thread.CurrentThread.ManagedThreadId, companyProfileThreadHelper.CompanyProfile.Symbol));
        LoadCompanyProfileEx(companyProfileThreadHelper.CompanyProfile);
        MDTrace.WriteLine(LogLevel.DEBUG,String.Format("[UpdateCompanyProfile] Thread {0} ended for {1}", Thread.CurrentThread.ManagedThreadId,  companyProfileThreadHelper.CompanyProfile.Symbol));
      }
      finally
      {
        companyProfileThreadHelper.ResetEvent.Set();
      }
    }

    private static void LoadCompanyProfileEx(CompanyProfile companyProfile)
    {
      CompanyProfile marketCompanyProfile = MarketDataHelper.GetCompanyProfile(companyProfile.Symbol);
      if (null == marketCompanyProfile)
      {
        MDTrace.WriteLine(LogLevel.DEBUG,"[[UpdateCompanyProfile]] No company profile for symbol '" + companyProfile.Symbol + "'");
        return;
      }
			if(!String.IsNullOrEmpty(marketCompanyProfile.Sector) && !marketCompanyProfile.Sector.Equals("N/A"))companyProfile.Sector=marketCompanyProfile.Sector;
			if(!String.IsNullOrEmpty(marketCompanyProfile.Industry) && !marketCompanyProfile.Industry.Equals("N/A"))companyProfile.Industry=marketCompanyProfile.Industry;
      if(!String.IsNullOrEmpty(marketCompanyProfile.Description) && !marketCompanyProfile.Description.Equals("N/A"))companyProfile.Description=marketCompanyProfile.Description;
      MDTrace.WriteLine(LogLevel.DEBUG,String.Format("[UpdateCompanyProfile] Updating company profile.....Symbol:{0} Sector:{1} Industry:{2}",companyProfile.Symbol,companyProfile.Sector, companyProfile.Industry));
      CompanyProfileDA.UpdateCompanyProfile(companyProfile);
		}
  }
}