using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using HeuristicLab.MainForm;
using HeuristicLab.Core.Views;
using HeuristicLab.Core;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Problems.MetaOptimization.Views {
  /// <summary>
  /// The visual representation of a <see cref="ParameterConfiguration"/>.
  /// </summary>
  [View("ParameterConfigurationList View")]
  [Content(typeof(ParameterConfigurationList), true)]
  public partial class ParameterConfigurationListView : ItemCollectionView<IParameterConfiguration> {
    /// <summary>
    /// Gets or sets the variable to represent visually.
    /// </summary>
    /// <remarks>Uses property <see cref="ViewBase.Item"/> of base class <see cref="ViewBase"/>.
    /// No own data storage present.</remarks>
    public new ParameterConfigurationList Content {
      get { return (ParameterConfigurationList)base.Content; }
      set { base.Content = value; }
    }

    public ParameterConfigurationListView() {
      InitializeComponent();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.CheckedItemsChanged += new Collections.CollectionItemsChangedEventHandler<IParameterConfiguration>(Content_CheckedItemsChanged);
    }

    protected override void DeregisterContentEvents() {
      Content.CheckedItemsChanged -= new Collections.CollectionItemsChangedEventHandler<IParameterConfiguration>(Content_CheckedItemsChanged);
      base.DeregisterContentEvents();
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      while (itemsListView.Items.Count > 0) RemoveListViewItem(itemsListView.Items[0]);
      viewHost.Content = null;
      if (Content != null) {
        Caption += " (" + Content.GetType().Name + ")";
        foreach (IParameterConfiguration item in Content.CheckedItems)
          AddListViewItem(CreateListViewItem(item));
        AdjustListViewColumnSizes();
        SortItemsListView(SortOrder.Ascending);
      }
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
    }

    protected override void addButton_Click(object sender, EventArgs e) {
      var selectorDialog = new ObjectSelectorDialog<IParameterConfiguration>(from c in Content
                                                                             where !Content.ItemChecked(c)
                                                                             group c by c.Category);
      if (selectorDialog.ShowDialog() == DialogResult.OK) {
        Content.SetItemCheckedState(selectorDialog.Item, true);
      }
    }

    protected override void removeButton_Click(object sender, EventArgs e) {
      if (itemsListView.SelectedItems.Count > 0) {
        foreach (ListViewItem item in itemsListView.SelectedItems)
          Content.SetItemCheckedState((IParameterConfiguration)item.Tag, false);
        itemsListView.SelectedItems.Clear();
      }
    }

    private void Content_CheckedItemsChanged(object sender, Collections.CollectionItemsChangedEventArgs<IParameterConfiguration> e) {
      foreach (IParameterConfiguration item in e.Items) {
        if (!Content.ItemChecked(item)) {
          ListViewItem found = FindListViewItem(item);
          if(found != null)
            RemoveListViewItem(found);
        } else {
          ListViewItem found = FindListViewItem(item);
          if (found == null)
            AddListViewItem(CreateListViewItem(item));
        }
      }
    }

    #region Helpers
    private ListViewItem FindListViewItem(IParameterConfiguration tag) {
      foreach (ListViewItem item in itemsListView.Items) {
        if (item.Tag == tag)
          return item;
      }
      return null;
    }
    #endregion
  }
}