#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 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.ComponentModel;
using System.Linq;
using HeuristicLab.MainForm;
using HeuristicLab.Problems.Instances.Views;

namespace HeuristicLab.Problems.Instances.QAPGenerator.Views {
  [View("QAP Instance Generators")]
  [Content(typeof(QAPInstanceGeneratorProvider), IsDefaultView = true)]
  public sealed partial class QAPInstanceGeneratorProviderView : ProblemInstanceProviderView<QAPData> {

    public new QAPInstanceGeneratorProvider Content {
      get { return (QAPInstanceGeneratorProvider)base.Content; }
      set { base.Content = value; }
    }

    private QAPInstanceGeneratorDescriptor SelectedDescriptor {
      get { return descriptorsComboBox.SelectedIndex >= 0 ? (QAPInstanceGeneratorDescriptor)descriptorsComboBox.SelectedItem : null; }
    }

    public QAPInstanceGeneratorProviderView() {
      InitializeComponent();
      splitContainer1.Visible = false;
      descriptorsComboBox.DisplayMember = "Name";
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      DeregisterDescriptorEvents();
      descriptorsComboBox.Items.Clear();
      if (Content == null) {
        descriptorViewHost.Content = null;
      } else {
        foreach (var descriptor in Content.GetDataDescriptors()) {
          descriptorsComboBox.Items.Add(descriptor);
        }
        descriptorsComboBox.SelectedIndex = descriptorsComboBox.Items.Count > 0 ? 0 : -1;
      }
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      loadButton.Enabled = !ReadOnly && !Locked && Content != null
        && SelectedDescriptor != null && SelectedDescriptor.IsConfigurationValid
        && GenericConsumer != null;
    }

    private void RegisterDescriptorEvents() {
      if (SelectedDescriptor != null)
        SelectedDescriptor.PropertyChanged += SelectedDescriptorOnPropertyChanged;
    }

    private void DeregisterDescriptorEvents() {
      foreach (var descriptor in descriptorsComboBox.Items.OfType<QAPInstanceGeneratorDescriptor>())
        descriptor.PropertyChanged -= SelectedDescriptorOnPropertyChanged;
    }

    private void SelectedDescriptorOnPropertyChanged(object sender, PropertyChangedEventArgs e) {
      SetEnabledStateOfControls();
    }

    private void descriptorsComboBox_SelectedIndexChanged(object sender, EventArgs e) {
      DeregisterDescriptorEvents();
      RegisterDescriptorEvents();
      descriptorViewHost.Content = (QAPInstanceGeneratorDescriptor)descriptorsComboBox.SelectedItem;
      SetEnabledStateOfControls();
    }

    private void loadButton_Click(object sender, EventArgs e) {
      GenericConsumer.Load(SelectedDescriptor.GetInstance());
    }
  }
}