#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 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.Diagnostics;
using System.Threading;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Hive;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Clients.Hive.Slave.Tests {
  [Item("Mock Job", "Represents mocked Job which just SpinWaits.")]
  [StorableClass]
  public class MockJob : NamedItem, IJob {
    public virtual bool IsParallelizable {
      get { return false; }
    }

    [Storable]
    protected bool computeInParallel;
    public bool ComputeInParallel {
      get { return computeInParallel; }
      set {
        if (computeInParallel != value) {
          computeInParallel = value;
          OnComputeInParallelChanged();
        }
      }
    }

    [Storable]
    private int indexInParentOptimizerList = -1;
    public int IndexInParentOptimizerList {
      get { return indexInParentOptimizerList; }
      set { this.indexInParentOptimizerList = value; }
    }

    [Storable]
    private bool collectChildJobs;
    public bool CollectChildJobs {
      get { return collectChildJobs; }
      set { collectChildJobs = value; }
    }

    private int ms = 1000; //ms
    private bool spinWait;
    public MockJob(int ms, bool spinWait) {
      this.ms = ms;
      this.spinWait = spinWait;
    }
    public MockJob() { }
    [StorableConstructor]
    protected MockJob(bool deserializing) { }
    protected MockJob(MockJob original, Cloner cloner)
      : base(original, cloner) {
      this.ComputeInParallel = original.ComputeInParallel;
      this.IndexInParentOptimizerList = original.IndexInParentOptimizerList;
      this.CollectChildJobs = original.CollectChildJobs;
      this.ExecutionTime = original.executionTime;
      this.ExecutionState = original.executionState;
      this.ms = original.ms;
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new MockJob(this, cloner);
    }

    [Storable]
    private ExecutionState executionState;
    public virtual ExecutionState ExecutionState {
      get { return executionState; }
      set {
        if (executionState != value) {
          this.executionState = value;
          OnExecutionStateChanged();
        }
      }
    }

    [Storable]
    private TimeSpan executionTime;
    public TimeSpan ExecutionTime {
      get { return executionTime; }
      set {
        if (executionTime != value) {
          executionTime = value;
          OnExecutionTimeChanged();
        }
      }
    }

    public virtual void Prepare() {
      this.ExecutionState = HeuristicLab.Core.ExecutionState.Prepared;
    }

    public virtual void Start() {
      new Thread(Run).Start();
    }

    private void Run() {
      try {
        if (spinWait) {
          Stopwatch watch = new Stopwatch();
          watch.Start();
          do {
            Thread.SpinWait(1000);
          } while (watch.ElapsedMilliseconds < ms);
          watch.Stop();
        } else {
          Thread.Sleep(ms);
        }
        Stop();
        OnJobStopped();
      }
      catch (ThreadAbortException) {
        //this happens when the appdomain is killed (e.g. abort from server)
        Stop();
      }
      catch (Exception e) {
        this.ExecutionState = HeuristicLab.Core.ExecutionState.Stopped;
        OnJobFailed(e);
      }
    }

    public virtual void Pause() {
      this.ExecutionState = HeuristicLab.Core.ExecutionState.Paused;
    }

    public virtual void Stop() {
      ExecutionState = HeuristicLab.Core.ExecutionState.Stopped;
    }

    public virtual void Resume(IEnumerable<IJob> childJobs) {
      ExecutionState = HeuristicLab.Core.ExecutionState.Stopped;
    }

    #region Events
    public event EventHandler<EventArgs<IJob>> NewChildJob;
    protected virtual void OnNewChildJob(IJob job) {
      EventHandler<EventArgs<IJob>> handler = NewChildJob;
      if (handler != null) handler(this, new EventArgs<IJob>(job));
    }

    public event EventHandler WaitForChildJobs;
    protected virtual void OnWaitForChildJobs() {
      EventHandler handler = WaitForChildJobs;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler DeleteChildJobs;
    protected virtual void OnDeleteChildJobs() {
      EventHandler handler = DeleteChildJobs;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler ComputeInParallelChanged;
    protected virtual void OnComputeInParallelChanged() {
      EventHandler handler = ComputeInParallelChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler ExecutionTimeChanged;
    protected virtual void OnExecutionTimeChanged() {
      EventHandler handler = ExecutionTimeChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler ExecutionStateChanged;
    protected virtual void OnExecutionStateChanged() {
      EventHandler handler = ExecutionStateChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler JobFailed;
    protected virtual void OnJobFailed(Exception e) {
      EventHandler handler = JobFailed;
      EventArgs<Exception> ev = new EventArgs<Exception>(e);
      if (handler != null) handler(this, ev);
    }

    public event EventHandler JobStopped;
    protected virtual void OnJobStopped() {
      EventHandler handler = JobStopped;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    public event EventHandler JobPaused;
    protected virtual void OnJobPaused() {
      EventHandler handler = JobPaused;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    #endregion
  }
}