#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("Optimization Knowledge Base (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.VSImageLibrary.Event;
      }
    }

    private long algorithmId;
    public long AlgorithmId {
      get { return algorithmId; }
      private set {
        if (algorithmId != value) {
          algorithmId = value;
          OnAlgorithmIdChanged();
        }
      }
    }
    private IAlgorithm algorithm;
    private IAlgorithm Algorithm {
      get { return algorithm; }
      set {
        DeregisterAlgorithmEvents();
        algorithm = value;
        RegisterAlgorithmEvents();
        if ((algorithm != null) && (problem != null)) {
          algorithm.Problem = problem;
          algorithm.Prepare(true);
        }
      }
    }
    private long problemId;
    public long ProblemId {
      get { return problemId; }
      private set {
        if (problemId != value) {
          problemId = value;
          OnProblemIdChanged();
        }
      }
    }
    private IProblem problem;
    private IProblem Problem {
      get { return problem; }
      set {
        problem = value;
        if ((algorithm != null) && (problem != null)) {
          algorithm.Problem = problem;
          algorithm.Prepare(true);
        }
      }
    }

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

    #region Persistence Properties
    [Storable(Name = "AlgorithmId")]
    private long StorableAlgorithmId {
      get { return algorithmId; }
      set { algorithmId = value; }
    }
    [Storable(Name = "Algorithm")]
    private IAlgorithm StorableAlgorithm {
      get { return Algorithm; }
      set { Algorithm = value; }
    }
    [Storable(Name = "ProblemId")]
    private long StorableProblemId {
      get { return problemId; }
      set { problemId = value; }
    }
    [Storable(Name = "Problem")]
    private IProblem StorableProblem {
      get { return Problem; }
      set { Problem = value; }
    }
    [Storable(Name = "Runs")]
    private RunCollection StorableRuns {
      get { return runs; }
      set { runs = value; }
    }
    #endregion

    [StorableConstructor]
    private OKBExperiment(bool deserializing) : base(deserializing) { }
    private OKBExperiment(OKBExperiment original, Cloner cloner)
      : base(original, cloner) {
      algorithmId = original.algorithmId;
      algorithm = cloner.Clone(original.algorithm);
      problemId = original.problemId;
      problem = cloner.Clone(original.problem);
      runs = cloner.Clone(original.runs);
      RegisterAlgorithmEvents();
    }
    public OKBExperiment()
      : base() {
      name = ItemName;
      description = ItemDescription;
      runs = new RunCollection();
    }

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      RegisterAlgorithmEvents();
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new OKBExperiment(this, cloner);
    }

    public void Load(Algorithm algorithm) {
      if (algorithm == null) {
        Algorithm = null;
        AlgorithmId = 0;
      } else {
        try {
          if (AlgorithmId != algorithm.Id) {
            AlgorithmData algorithmData = OKBClient.Instance.GetAlgorithmData(algorithm.Id);
            using (MemoryStream stream = new MemoryStream(algorithmData.Data)) {
              Algorithm = XmlParser.Deserialize<IAlgorithm>(stream);
              Algorithm.StoreAlgorithmInEachRun = true;
            }
          }
          AlgorithmId = algorithm.Id;
        }
        catch (Exception ex) {
          Algorithm = null;
          AlgorithmId = 0;
          OnExceptionOccurred(ex);
        }
      }
    }
    public void Load(Problem problem) {
      if (problem == null) {
        Problem = null;
        ProblemId = 0;
      } else {
        try {
          if (ProblemId != problem.Id) {
            ProblemData problemData = OKBClient.Instance.GetProblemData(problem.Id);
            using (MemoryStream stream = new MemoryStream(problemData.Data)) {
              Problem = XmlParser.Deserialize<IProblem>(stream);
            }
          }
          ProblemId = problem.Id;
        }
        catch (Exception ex) {
          Problem = null;
          ProblemId = 0;
          OnExceptionOccurred(ex);
        }
      }
    }

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

    #region Events
    public event EventHandler AlgorithmIdChanged;
    private void OnAlgorithmIdChanged() {
      EventHandler handler = AlgorithmIdChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler ProblemIdChanged;
    private void OnProblemIdChanged() {
      EventHandler handler = ProblemIdChanged;
      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);
        Algorithm.Runs.ItemsAdded += new Collections.CollectionItemsChangedEventHandler<IRun>(algorithm_Runs_ItemsAdded);
        Algorithm.Runs.ItemsRemoved += new Collections.CollectionItemsChangedEventHandler<IRun>(algorithm_Runs_ItemsRemoved);
        Algorithm.Runs.CollectionReset += new Collections.CollectionItemsChangedEventHandler<IRun>(algorithm_Runs_CollectionReset);
      }
    }
    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);
        Algorithm.Runs.ItemsAdded -= new Collections.CollectionItemsChangedEventHandler<IRun>(algorithm_Runs_ItemsAdded);
        Algorithm.Runs.ItemsRemoved -= new Collections.CollectionItemsChangedEventHandler<IRun>(algorithm_Runs_ItemsRemoved);
        Algorithm.Runs.CollectionReset -= new Collections.CollectionItemsChangedEventHandler<IRun>(algorithm_Runs_CollectionReset);
      }
    }
    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) {
      try {
        OKBClient.Instance.AddRun(AlgorithmId, ProblemId, algorithm);
      }
      catch (Exception ex) {
        OnExceptionOccurred(ex);
      }
      OnStopped();
    }
    private void algorithm_Runs_ItemsAdded(object sender, Collections.CollectionItemsChangedEventArgs<IRun> e) {
      runs.AddRange(e.Items);
    }
    private void algorithm_Runs_ItemsRemoved(object sender, Collections.CollectionItemsChangedEventArgs<IRun> e) {
      runs.RemoveRange(e.Items);
    }
    private void algorithm_Runs_CollectionReset(object sender, Collections.CollectionItemsChangedEventArgs<IRun> e) {
      runs.Clear();
      runs.AddRange(algorithm.Runs);
    }
    #endregion
  }
}