#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Hive.Client.ExecutionEngine;
using HeuristicLab.Hive.Client.Common;
using System.Threading;
using System.Reflection;
using System.Diagnostics;
using System.Security.Permissions;
using System.Security.Policy;
using System.Security;
using HeuristicLab.Hive.Client.Communication;
using HeuristicLab.Hive.Contracts.BusinessObjects;
using HeuristicLab.Hive.Contracts;
using System.Runtime.Remoting.Messaging;
using HeuristicLab.PluginInfrastructure;
using System.ServiceModel;
using System.ServiceModel.Description;
using HeuristicLab.Hive.Client.Core.ClientConsoleService;
using HeuristicLab.Hive.Client.Core.ConfigurationManager;
using HeuristicLab.Hive.Client.Communication.ServerService;
using HeuristicLab.Hive.JobBase;


namespace HeuristicLab.Hive.Client.Core {
  public class Core: MarshalByRefObject {
    public delegate string GetASnapshotDelegate();

    Dictionary<long, Executor> engines = new Dictionary<long, Executor>();
    Dictionary<long, AppDomain> appDomains = new Dictionary<long, AppDomain>();
    Dictionary<long, Job> jobs = new Dictionary<long, Job>();

    private WcfService wcfService;

    public void Start() {

      ClientConsoleServer server = new ClientConsoleServer();
      server.StartClientConsoleServer(new Uri("net.tcp://127.0.0.1:8000/ClientConsole/"));

      ConfigManager manager = ConfigManager.Instance;
      manager.Core = this;

      wcfService = WcfService.Instance;
      ConnectionContainer cc = ConfigManager.Instance.GetServerIPAndPort();
      if (cc.IPAdress != String.Empty && cc.Port != 0) {
        wcfService.Connect(cc.IPAdress, cc.Port);
      }

      wcfService.LoginCompleted += new EventHandler<LoginCompletedEventArgs>(wcfService_LoginCompleted);
      wcfService.PullJobCompleted += new EventHandler<PullJobCompletedEventArgs>(wcfService_PullJobCompleted);
      wcfService.SendJobResultCompleted += new EventHandler<SendJobResultCompletedEventArgs>(wcfService_SendJobResultCompleted);      
      wcfService.ConnectionRestored += new EventHandler(wcfService_ConnectionRestored);
      wcfService.ServerChanged += new EventHandler(wcfService_ServerChanged);
       
      Heartbeat beat = new Heartbeat { Interval = 10000 };
      beat.StartHeartbeat();     

      MessageQueue queue = MessageQueue.GetInstance();
      while (true) {
        MessageContainer container = queue.GetMessage();
        Debug.WriteLine("Main loop received this message: " + container.Message.ToString());
        Logging.GetInstance().Info(this.ToString(), container.Message.ToString());
        DetermineAction(container);
      }
    }

    private void DetermineAction(MessageContainer container) {
      switch (container.Message) {
        case MessageContainer.MessageType.AbortJob:
          engines[container.JobId].Abort();
          break;
        case MessageContainer.MessageType.JobAborted:
          Debug.WriteLine("-- Job Aborted Message received");
          break;

        case MessageContainer.MessageType.RequestSnapshot:
          engines[container.JobId].RequestSnapshot();
          break;
        case MessageContainer.MessageType.SnapshotReady:
          Thread ssr = new Thread(new ParameterizedThreadStart(GetSnapshot));
          ssr.Start(container.JobId);          
          break;

        case MessageContainer.MessageType.FetchJob: 
          wcfService.PullJobAsync(Guid.NewGuid());
          break;          
        case MessageContainer.MessageType.FinishedJob:
          Thread finThread = new Thread(new ParameterizedThreadStart(GetFinishedJob));
          finThread.Start(container.JobId);          
          break;      
      }
    }

    #region Async Threads for the EE
    
    private void GetFinishedJob(object jobId) {
      long jId = (long)jobId;
      byte[] sJob = engines[jId].GetFinishedJob();

      JobResult jobResult = new JobResult { Job = jobs[jId], Result = sJob, Client = ConfigManager.Instance.GetClientInfo() };
      wcfService.SendJobResultAsync(jobResult, true);      
    }

    private void GetSnapshot(object jobId) {
      long jId = (long)jobId;
      byte[] obj = engines[jId].GetSnapshot();
    }

    #endregion

    #region wcfService Events

    void wcfService_ConnectionRestored(object sender, EventArgs e) {
      //Do some fancy new things here... e.g: check all appdomains if there are still active Jobs that need to be transmitted
    }

    void wcfService_LoginCompleted(object sender, LoginCompletedEventArgs e) {
      if (e.Result.Success) {
        Logging.GetInstance().Info(this.ToString(), "Login completed to Hive Server @ " + DateTime.Now);        
      } else
        Logging.GetInstance().Error(this.ToString(), e.Result.StatusMessage);
    }    

    void wcfService_PullJobCompleted(object sender, PullJobCompletedEventArgs e) {
      if (e.Result.StatusMessage != ApplicationConstants.RESPONSE_COMMUNICATOR_NO_JOBS_LEFT) {
        bool sandboxed = false;

        PluginManager.Manager.Initialize();
        AppDomain appDomain =  PluginManager.Manager.CreateAndInitAppDomainWithSandbox(e.Result.Job.Id.ToString(), sandboxed, typeof(TestJob));
        appDomain.UnhandledException += new UnhandledExceptionEventHandler(appDomain_UnhandledException);

        jobs.Add(e.Result.Job.Id, e.Result.Job);
        appDomains.Add(e.Result.Job.Id, appDomain);

        Executor engine = (Executor)appDomain.CreateInstanceAndUnwrap(typeof(Executor).Assembly.GetName().Name, typeof(Executor).FullName);
        engine.JobId = e.Result.Job.Id;
        engine.Queue = MessageQueue.GetInstance();
        engine.Start(e.Result.SerializedJob);
        engines.Add(e.Result.Job.Id, engine);

        ClientStatusInfo.JobsFetched++;

        Debug.WriteLine("Increment FetchedJobs to:" + ClientStatusInfo.JobsFetched);
      }
    }

    void wcfService_SendJobResultCompleted(object sender, SendJobResultCompletedEventArgs e) {
      if (e.Result.Success) {
        AppDomain.Unload(appDomains[e.Result.Job.Id]);
        appDomains.Remove(e.Result.Job.Id);
        engines.Remove(e.Result.Job.Id);
        jobs.Remove(e.Result.Job.Id);
        ClientStatusInfo.JobsProcessed++;
        Debug.WriteLine("ProcessedJobs to:" + ClientStatusInfo.JobsProcessed);
      } else {
        Debug.WriteLine("Job sending FAILED!");
      }
    }

    void wcfService_ServerChanged(object sender, EventArgs e) {
      foreach(KeyValuePair<long, AppDomain> entries in appDomains)
        AppDomain.Unload(appDomains[entries.Key]);
      appDomains = new Dictionary<long, AppDomain>();
      engines = new Dictionary<long, Executor>();
      wcfService.LoginAsync(ConfigManager.Instance.GetClientInfo());
    }


    #endregion

    public Dictionary<long, Executor> GetExecutionEngines() {
      return engines;
    }

    void appDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) {
      Logging.GetInstance().Error(this.ToString(), " Exception: " + e.ExceptionObject.ToString());
    }
  }
}