#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.Drawing;
using System.IO;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Optimization;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Persistence.Default.Xml;

namespace HeuristicLab.Clients.OKB {
  [Item("OKB Experiment", "...")]
  [Creatable("OKB")]
  [StorableClass]
  public sealed class OKBExperiment : NamedItem, IOptimizer, IStorableContent {
    public string Filename { get; set; }

    public override Image ItemImage {
      get {
        if (Algorithm != null) return Algorithm.ItemImage;
        else return HeuristicLab.Common.Resources.VS2008ImageLibrary.Event;
      }
    }

    [Storable]
    private long AlgorithmId { get; set; }
    [Storable]
    private IAlgorithm algorithm;
    private IAlgorithm Algorithm {
      get { return algorithm; }
      set {
        DeregisterAlgorithmEvents();
        algorithm = value;
        RegisterAlgorithmEvents();
        algorithm.Problem = Problem;
        OnChanged();
      }
    }
    private long ProblemId { get; set; }
    private IProblem problem;
    public IProblem Problem {
      get { return problem; }
      private set {
        problem = value;
        if (Algorithm != null) Algorithm.Problem = problem;
        OnChanged();
      }
    }

    public IKeyedItemCollection<string, IParameter> Parameters {
      get {
        if (Algorithm != null) return Algorithm.Parameters;
        else return null;
      }
    }
    public ResultCollection Results {
      get {
        if (Algorithm != null) return Algorithm.Results;
        else return null;
      }
    }
    public RunCollection Runs {
      get {
        if (Algorithm != null) return Algorithm.Runs;
        else return null;
      }
    }
    public ExecutionState ExecutionState {
      get {
        if (Algorithm != null) return Algorithm.ExecutionState;
        else return ExecutionState.Stopped;
      }
    }
    public TimeSpan ExecutionTime {
      get {
        if (Algorithm != null) return Algorithm.ExecutionTime;
        else return TimeSpan.Zero;
      }
    }

    public OKBExperiment()
      : base() {
      name = ItemName;
      description = ItemDescription;
    }
    [StorableConstructor]
    private OKBExperiment(bool deserializing) : base(deserializing) { }

    public void LoadAlgorithm(long id) {
      AlgorithmId = id;
      AlgorithmData algorithmData = OKBClient.Instance.GetAlgorithmData(id);

      using (MemoryStream stream = new MemoryStream(algorithmData.Data)) {
        Algorithm = XmlParser.Deserialize<IAlgorithm>(stream);
      }
    }
    public void LoadProblem(long id) {
      ProblemId = id;
      ProblemData problemData = OKBClient.Instance.GetProblemData(id);

      using (MemoryStream stream = new MemoryStream(problemData.Data)) {
        Problem = XmlParser.Deserialize<IProblem>(stream);
      }
    }

    public void Pause() {
      Algorithm.Pause();
    }
    public void Prepare(bool clearRuns) {
      if (Algorithm != null) Algorithm.Prepare(clearRuns);
    }
    public void Prepare() {
      Algorithm.Prepare();
    }
    public void Start() {
      Algorithm.Start();
    }
    public void Stop() {
      Algorithm.Stop();
    }

    #region Events
    public event EventHandler Changed;
    private void OnChanged() {
      EventHandler handler = Changed;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler<EventArgs<Exception>> ExceptionOccurred;
    private void OnExceptionOccurred(Exception exception) {
      EventHandler<EventArgs<Exception>> handler = ExceptionOccurred;
      if (handler != null) handler(this, new EventArgs<Exception>(exception));
    }
    public event EventHandler ExecutionStateChanged;
    private void OnExecutionStateChanged() {
      EventHandler handler = ExecutionStateChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler ExecutionTimeChanged;
    private void OnExecutionTimeChanged() {
      EventHandler handler = ExecutionTimeChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Prepared;
    private void OnPrepared() {
      EventHandler handler = Prepared;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Started;
    private void OnStarted() {
      EventHandler handler = Started;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Paused;
    private void OnPaused() {
      EventHandler handler = Paused;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Stopped;
    private void OnStopped() {
      EventHandler handler = Stopped;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    private void RegisterAlgorithmEvents() {
      if (Algorithm != null) {
        Algorithm.ExceptionOccurred += new EventHandler<EventArgs<Exception>>(Algorithm_ExceptionOccurred);
        Algorithm.ExecutionStateChanged += new EventHandler(Algorithm_ExecutionStateChanged);
        Algorithm.ExecutionTimeChanged += new EventHandler(Algorithm_ExecutionTimeChanged);
        Algorithm.ItemImageChanged += new EventHandler(Algorithm_ItemImageChanged);
        Algorithm.Paused += new EventHandler(Algorithm_Paused);
        Algorithm.Prepared += new EventHandler(Algorithm_Prepared);
        Algorithm.Started += new EventHandler(Algorithm_Started);
        Algorithm.Stopped += new EventHandler(Algorithm_Stopped);
      }
    }
    private void DeregisterAlgorithmEvents() {
      if (Algorithm != null) {
        Algorithm.ExceptionOccurred -= new EventHandler<EventArgs<Exception>>(Algorithm_ExceptionOccurred);
        Algorithm.ExecutionStateChanged -= new EventHandler(Algorithm_ExecutionStateChanged);
        Algorithm.ExecutionTimeChanged -= new EventHandler(Algorithm_ExecutionTimeChanged);
        Algorithm.ItemImageChanged -= new EventHandler(Algorithm_ItemImageChanged);
        Algorithm.Paused -= new EventHandler(Algorithm_Paused);
        Algorithm.Prepared -= new EventHandler(Algorithm_Prepared);
        Algorithm.Started -= new EventHandler(Algorithm_Started);
        Algorithm.Stopped -= new EventHandler(Algorithm_Stopped);
      }
    }
    private void Algorithm_ExceptionOccurred(object sender, EventArgs<Exception> e) {
      OnExceptionOccurred(e.Value);
    }
    private void Algorithm_ExecutionStateChanged(object sender, EventArgs e) {
      OnExecutionStateChanged();
    }
    private void Algorithm_ExecutionTimeChanged(object sender, EventArgs e) {
      OnExecutionTimeChanged();
    }
    private void Algorithm_ItemImageChanged(object sender, EventArgs e) {
      OnItemImageChanged();
    }
    private void Algorithm_Paused(object sender, EventArgs e) {
      OnPaused();
    }
    private void Algorithm_Prepared(object sender, EventArgs e) {
      OnPrepared();
    }
    private void Algorithm_Started(object sender, EventArgs e) {
      OnStarted();
    }
    private void Algorithm_Stopped(object sender, EventArgs e) {
      OnStopped();
    }
    #endregion
  }
}