#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2016 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 HeuristicLab.Common.Resources;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.Data.Views;
using HeuristicLab.MainForm;
using HeuristicLab.Optimization;
using HeuristicLab.OptimizationExpertSystem.Common;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace HeuristicLab.OptimizationExpertSystem {
  [View("Solver View")]
  [Content(typeof(KnowledgeCenter), IsDefaultView = false)]
  public partial class SolverView : KnowledgeCenterViewBase {
    private EnumValueView<SeedingStrategyTypes> seedingStrategyView;
    private CheckedItemListView<IScope> seedingSolutionsView;
    protected virtual bool SuppressEvents { get; set; }

    public SolverView() {
      InitializeComponent();
      algorithmStartButton.Text = string.Empty;
      algorithmStartButton.Image = VSImageLibrary.Play;
      algorithmCloneButton.Text = string.Empty;
      algorithmCloneButton.Image = VSImageLibrary.Clone;
      seedingStrategyView = new EnumValueView<SeedingStrategyTypes>() {
        Dock = DockStyle.Fill
      };
      seedingSolutionsView = new CheckedItemListView<IScope>() {
        Dock = DockStyle.Fill
      };
      seedingStrategyPanel.Controls.Add(seedingStrategyView);
      solutionSeedingTabPage.Controls.Add(seedingSolutionsView);
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      SuppressEvents = true;
      try {
        if (Content == null) {
          maxEvaluationsView.Content = null;
          solverParametersView.Content = null;
          runsView.Content = null;
          seededRunsView.Content = null;
          seedingStrategyView.Content = null;
          seedingSolutionsView.Content = null;
        } else {
          maxEvaluationsView.Content = Content.MaximumEvaluations;
          runsView.Content = Content.InstanceRuns;
          seededRunsView.Content = Content.SeededRuns;
          seedingStrategyView.Content = Content.SeedingStrategy;
          seedingSolutionsView.Content = Content.SolutionSeedingPool;
        }
      } finally { SuppressEvents = false; }
      UpdateSuggestedInstancesCombobox();
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      suggestedInstancesComboBox.Enabled = Content != null && !ReadOnly && !Locked;
      algorithmStartButton.Enabled = Content != null && !ReadOnly && !Locked && suggestedInstancesComboBox.SelectedIndex >= 0;
      algorithmCloneButton.Enabled = Content != null && !ReadOnly && !Locked && suggestedInstancesComboBox.SelectedIndex >= 0;
      runsView.Enabled = Content != null;
    }

    #region Update Controls
    private void UpdateSuggestedInstancesCombobox() {
      var prevSelection = (AlgorithmInstanceItem)suggestedInstancesComboBox.SelectedItem;
      var prevNewIndex = -1;
      suggestedInstancesComboBox.Items.Clear();
      if (Content == null) return;

      var ranking = Content.GetAlgorithmInstanceRanking().ToList();

      for (var i = 0; i < ranking.Count; i++) {
        suggestedInstancesComboBox.Items.Add(new AlgorithmInstanceItem(ranking[i]));
        if (prevSelection == null || ranking[i].Key.Name == prevSelection.Item.Key.Name)
          prevNewIndex = prevSelection == null ? 0 : i;
      }
      suggestedInstancesComboBox.SelectedIndex = prevNewIndex;
    }
    #endregion

    #region Content Event Handlers
    protected override void OnAlgorithmInstanceStarted(IAlgorithm algorithm) {
      base.OnAlgorithmInstanceStarted(algorithm);
      var form = new AlgorithmControlForm(algorithm, showOnlyFinalResultCheckBox.Checked);
      form.Show(resultsDockPanel);
    }

    protected override void OnRecommendationModelChanged() {
      base.OnRecommendationModelChanged();
      UpdateSuggestedInstancesCombobox();
    }
    #endregion

    #region Control Event Handlers
    private void AlgorithmStartButtonOnClick(object sender, EventArgs e) {
      if (suggestedInstancesComboBox.SelectedIndex >= 0)
        Content.StartAlgorithmAsync(Content.AlgorithmInstances.Select((a, i) => new { Alg = a, Index = i}).Single(x => x.Alg.Name == ((AlgorithmInstanceItem)suggestedInstancesComboBox.SelectedItem).Item.Key.Name).Index);
    }

    private void AlgorithmCloneButtonOnClick(object sender, EventArgs e) {
      if (suggestedInstancesComboBox.SelectedIndex >= 0)
        MainForm.ShowContent((IAlgorithm)Content.AlgorithmInstances[Content.AlgorithmInstances.Select((a, i) => new { Alg = a, Index = i }).Single(x => x.Alg.Name == ((AlgorithmInstanceItem)suggestedInstancesComboBox.SelectedItem).Item.Key.Name).Index].Clone());
    }

    private void SuggestedInstancesComboBoxOnSelectedIndexChanged(object sender, EventArgs e) {
      if (InvokeRequired) { Invoke((Action<object, EventArgs>)SuggestedInstancesComboBoxOnSelectedIndexChanged, sender, e); return; }
      if (suggestedInstancesComboBox.SelectedIndex >= 0) {
        var alg = Content.AlgorithmInstances[Content.AlgorithmInstances.Select((a, i) => new { Alg = a, Index = i }).Single(x => x.Alg.Name == ((AlgorithmInstanceItem)suggestedInstancesComboBox.SelectedItem).Item.Key.Name).Index];
        solverParametersView.Content = alg.Parameters;
        var engineAlg = alg as EngineAlgorithm;
        if (engineAlg != null) operatorGraphViewHost.Content = engineAlg.OperatorGraph;
        else operatorGraphViewHost.Content = new Data.StringValue("Algorithm is not modeled as an operator graph.");
      } else {
        solverParametersView.Content = null;
        operatorGraphViewHost.Content = null;
      }
      SetEnabledStateOfControls();
    }
    #endregion

    #region Helper Classes and Methods
    private class AlgorithmInstanceItem {
      private readonly KeyValuePair<IAlgorithm, double> item;
      public KeyValuePair<IAlgorithm, double> Item { get { return item; } }

      public AlgorithmInstanceItem(KeyValuePair<IAlgorithm, double> item) {
        this.item = item;
      }

      public override string ToString() {
        return item.Value.ToString("N0") + ": " + item.Key.Name;
      }
    }
    #endregion
  }
}