using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using HeuristicLab.Core;

namespace HeuristicLab.Problems.MetaOptimization.Views {
  public partial class ObjectSelectorDialog<T> : Form where T : IItem {
    private bool initialized;
    private List<IItem> items;
    private IEnumerable<IGrouping<string, T>> selectableItems;

    private T item;
    public T Item {
      get { return item; }
    }

    public ObjectSelectorDialog(IEnumerable<IGrouping<string, T>> selectableItems) {
      this.initialized = false;
      this.items = new List<IItem>();
      this.item = default(T);
      this.selectableItems = selectableItems;
      InitializeComponent();
    }

    private void ObjectSelectorDialog_Load(object sender, EventArgs e) {
      if (!initialized) {
        itemsListView.SmallImageList = new ImageList();
        
        foreach (IGrouping<string, T> item in selectableItems) {
          ListViewGroup group = new ListViewGroup(item.Key);
          itemsListView.Groups.Add(group);
          foreach (T i in item) {
            items.Add(i);
            string[] columns;
            if(i is INamedItem) {
              INamedItem ni = i as INamedItem;
              columns = new string[] { ni.Name, ni.Description, ni.GetType().Name };
            } else {
              columns = new string[] { i.ItemName, i.ItemDescription, i.GetType().Name };
            }
            ListViewItem value = new ListViewItem(columns, group);
            itemsListView.SmallImageList.Images.Add(i.ItemImage);
            value.ImageIndex = itemsListView.SmallImageList.Images.Count - 1;
            value.Tag = i;
            itemsListView.Items.Add(value);
          }
        }
        for (int i = 0; i < itemsListView.Columns.Count; i++)
          itemsListView.Columns[i].AutoResize(ColumnHeaderAutoResizeStyle.ColumnContent);
        initialized = true;
      }
    }

    private void ObjectSelectorDialog_Shown(object sender, EventArgs e) {
      item = default(T);
    }

    private void okButton_Click(object sender, EventArgs e) {
      if (itemsListView.SelectedItems.Count == 1) {
        item = (T)itemsListView.SelectedItems[0].Tag;
        DialogResult = DialogResult.OK;
        Close();
      }
    }

    private void itemsListView_DoubleClick(object sender, EventArgs e) {
      if (itemsListView.SelectedItems.Count == 1) {
        item = (T)itemsListView.SelectedItems[0].Tag;
        DialogResult = DialogResult.OK;
        Close();
      }
    }

    private void itemsListView_SelectedIndexChanged(object sender, EventArgs e) {
      okButton.Enabled = itemsListView.SelectedItems.Count == 1;
    }


  }
}