using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using MarketData.MarketDataModel;
using MarketData.DataAccess;
using MarketData.Utils;

namespace MarketData.Helper
{
  public class EarningsAnnouncementsMarketDataHelper : MarketDataHelperBase<String>
  {
    private static int MaxThreads = 7; // (int)ThreadHelperEnum.MaxThreads;

    public EarningsAnnouncementsMarketDataHelper()
    {
    }
    public bool UpdateEarningsAnnouncements(String symbol=null)
    {
      Profiler profiler=new Profiler();
      try
      {
        if(symbol==null)Queue=PricingDA.GetSymbols();
        else (Queue=new List<String>()).Add(symbol);
        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 earnings announcement fetches ..."));    
        DateTime modified=DateTime.Now;
        while (true)
        {
          ManualResetEvent[] availableEvents=GetAvailableEvents(resetEvents);
          ManualResetEvent[] busyEvents=GetBusyEvents(resetEvents);
          if (null == PeekQueueItem() && 0==busyEvents.Length)
          {
            MDTrace.WriteLine(LogLevel.DEBUG,String.Format("Earnings announcement queue contains {0} items, busy events {1}, all done.",0,busyEvents.Length));
            break;
          }
          for (int index = 0; index < availableEvents.Length; index++)
          {
            symbol=GetQueueItem();
            if (null != symbol)
            {
              availableEvents[index].Reset();
              ThreadHelper earningsAnnouncementsThreadHelper = new ThreadHelper(symbol,modified,availableEvents[index]);
              ThreadPool.QueueUserWorkItem(ThreadPoolCallbackEarningsAnnouncements, earningsAnnouncementsThreadHelper);
            }
            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,"Earnings announcements waiting for free slots...");
          if(resetEvents.Length>0)WaitHandle.WaitAny(resetEvents);
          if(null==PeekQueueItem())resetEvents=ResizeEvents(resetEvents);
        }    // while
        MDTrace.WriteLine(LogLevel.DEBUG,"Earnings announcements  completed.");
        return true;
      }
      finally
      {
        MDTrace.WriteLine(LogLevel.DEBUG,String.Format("[UpdateEarningsAnnouncements]End, total took {0}(ms)",profiler.End()));
      }
    }
    public void ThreadPoolCallbackEarningsAnnouncements(Object earningsAnnouncementsThreadHelperContext)
    {
      ThreadHelper threadHelper = (ThreadHelper)earningsAnnouncementsThreadHelperContext;
			try
			{
				MDTrace.WriteLine(LogLevel.DEBUG,String.Format("Load earnings announcements, Thread {0} started for {1}...", Thread.CurrentThread.ManagedThreadId, threadHelper.Symbol));
				LoadEarningsAnnouncementsEx(threadHelper.Symbol,threadHelper.Modified);
				MDTrace.WriteLine(LogLevel.DEBUG,String.Format("Load earnings announcements, Thread {0} ended for {1}", Thread.CurrentThread.ManagedThreadId, threadHelper.Symbol));
			}
			finally
			{
			  threadHelper.ResetEvent.Set();
			}
    }
// Single threaded method, use for debugging a single symbol fetch without going through the queue
		public static void LoadEarningsAnnouncementsEx(String symbol,DateTime modified)
		{
      EarningsAnnouncements earningsAnnouncements=MarketDataHelper.GetEarningsAnnouncements(symbol);
      if(null==earningsAnnouncements||0==earningsAnnouncements.Count)
      {
        MDTrace.WriteLine(LogLevel.DEBUG,"Error loading earnings announcements for '"+symbol+"'");
        return;
      }
      MDTrace.WriteLine(String.Format("[UpdateEarningsAnnouncements] Got {0} for {1}",earningsAnnouncements.Count,symbol));
      if(!EarningsAnnouncementsDA.InsertEarningsAnnouncements(earningsAnnouncements))MDTrace.WriteLine(String.Format("[UpdateEarningsAnnouncements] Insert failed for {0}",symbol));
      else MDTrace.WriteLine(String.Format("[UpdateEarningsAnnouncements] Insert succeeded for {0}",symbol)); 
		}
  }
}