using System;
using System.Drawing;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Clients.Hive {
  [StorableClass]
  public class EngineJob : ItemJob {
    [Storable]
    protected IOperation initialOperation;
    public IOperation InitialOperation {
      get { return initialOperation; }
      set { initialOperation = value; }
    }

    public new IEngine Item {
      get { return (IEngine)base.Item; }
      set { base.Item = value; }
    }

    public override TimeSpan ExecutionTime {
      get { return Item.ExecutionTime; }
    }

    public override ExecutionState ExecutionState {
      get { return Item.ExecutionState; }
    }

    #region constructors and cloning
    public EngineJob() { }
    public EngineJob(IOperation initialOperation, IEngine engine) {
      this.initialOperation = initialOperation;
      this.Item = engine;
    }

    [StorableConstructor]
    protected EngineJob(bool deserializing) : base(deserializing) { }
    protected EngineJob(EngineJob original, Cloner cloner)
      : base(original, cloner) {
      this.initialOperation = cloner.Clone(original.initialOperation);
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new EngineJob(this, cloner);
    }
    #endregion

    public override bool IsParallelizable {
      get { return false; }
    }

    public override void Prepare() { }

    public override void Start() {
      Item.Prepare(initialOperation);
      Item.Start();
    }
    
    public override void Pause() {
      Item.Pause();
    }

    public override void Stop() {
      Item.Stop();
    }

    protected override void RegisterItemEvents() {
      base.RegisterItemEvents();
      Item.Stopped += new EventHandler(engine_Stopped);
      Item.Paused += new EventHandler(Item_Paused);
      Item.Started += new EventHandler(Item_Started);
      Item.ExceptionOccurred += new EventHandler<EventArgs<Exception>>(engine_ExceptionOccurred);
      Item.ExecutionStateChanged += new EventHandler(Item_ExecutionStateChanged);
      Item.ExecutionTimeChanged += new EventHandler(Item_ExecutionTimeChanged);
    }

    protected override void DeregisterItemEvents() {
      Item.Stopped -= new EventHandler(engine_Stopped);
      Item.Paused -= new EventHandler(Item_Paused);
      Item.Started -= new EventHandler(Item_Started);
      Item.ExceptionOccurred -= new EventHandler<EventArgs<Exception>>(engine_ExceptionOccurred);
      Item.ExecutionStateChanged -= new EventHandler(Item_ExecutionStateChanged);
      Item.ExecutionTimeChanged -= new EventHandler(Item_ExecutionTimeChanged);
      base.DeregisterItemEvents();
    }

    private void engine_ExceptionOccurred(object sender, EventArgs<Exception> e) {
      OnJobFailed(e);
    }

    private void engine_Stopped(object sender, EventArgs e) {
      OnJobStopped();
    }

    private void Item_Paused(object sender, EventArgs e) {
      OnJobPaused();
    }

    private void Item_ExecutionTimeChanged(object sender, EventArgs e) {
      OnExecutionTimeChanged();
    }

    private void Item_ExecutionStateChanged(object sender, EventArgs e) {
      OnExecutionStateChanged();
    }

    private void Item_Started(object sender, EventArgs e) {
      OnJobStarted();
    }

    public override bool CanChangeDescription {
      get { return false; }
    }

    public override bool CanChangeName {
      get { return false; }
    }

    public override string Description {
      get { return string.Empty; }
      set { throw new NotSupportedException(); }
    }

    public override string Name {
      get { return Item != null ? Item.ToString() : null; }
      set { throw new NotSupportedException(); }
    }

    public override string ItemDescription {
      get { return Description; }
    }

    public override Image ItemImage {
      get { return HeuristicLab.Common.Resources.VSImageLibrary.Operator; }
    }
    
    public override string ItemName {
      get { return "EngineJob"; }
    }

    public override Version ItemVersion {
      get { return null; }
    }
  }
}