using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Hive.Contracts.BusinessObjects;
using System.Timers;
using HeuristicLab.Hive.Contracts;
using System.Collections;
using System.Threading;

namespace HeuristicLab.Hive.Server.ServerConsole {
  public class JobDataFetcher {
    public List<State> PollStates { get; set; }    

    public event EventHandler NewDataAvailable;

    private System.Timers.Timer timer;

    public List<JobDto> CachedJobs { get; set; }

    public double Interval {
      get { return timer.Interval; }
      set { timer.Interval = value; }
    }

    private int _nrOfEntriesOnPage;
    public int NrOfEntriesOnPage {
      get {
        return _nrOfEntriesOnPage;
      }
      set {
        Console.WriteLine("Setting for " + PollStates + " changed to: " + value);        
        _nrOfEntriesOnPage = value;        
        Thread t = new Thread(new ThreadStart(DoUpdateRun));
        t.Start();        
      }
    }    
    public int CurrentPage { get; set; }

    public JobDataFetcher(IEnumerable<State> states, int nrOfEntries) {
      PollStates = new List<State>();
      CachedJobs = new List<JobDto>();
      NrOfEntriesOnPage = nrOfEntries;
      CurrentPage = 0;
      PollStates.AddRange(states);
      timer = new System.Timers.Timer();
      timer.Interval = 5000;
      timer.Elapsed += new ElapsedEventHandler(Timer_Elapsed);      
    }

    public void Start() {
      timer.Start();
    }

    public void Forward() {
      CurrentPage++;
      DoUpdateRun();
    }
    public void Backward() {
      if (CurrentPage != 0)
        CurrentPage--;
      DoUpdateRun();
    } 

    private void Timer_Elapsed(object sender, ElapsedEventArgs e) {
      DoUpdateRun();
    }

    private void DoUpdateRun() {      
      foreach (State stat in PollStates) {
        ResponseList<JobDto> resList = ServiceLocator.GetJobManager().GetAllJobsWithFilter(stat, CurrentPage * NrOfEntriesOnPage,
                                                            NrOfEntriesOnPage);
        if (resList.Success) {
          if (resList.List.Count == 0) {
            if (CurrentPage > 0) {
              CurrentPage--;
            }
          } else {
            CachedJobs = new List<JobDto>();
            CachedJobs.AddRange(resList.List);
          }
        }
      }
      if (NewDataAvailable != null)
        NewDataAvailable(this, new EventArgs());
    }
  }
}