#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2014 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;
using System;
using System.Windows.Forms;

namespace HeuristicLab.Core.Networks.Views {
  public partial class NetworkItemSelector : UserControl {
    protected Func<INetworkItem, bool> networkItemCondition;
    protected INetworkItem root;
    public INetworkItem Root {
      get { return root; }
    }
    public string Caption {
      get { return networkItemsGroupBox.Text; }
      set {
        if (InvokeRequired)
          Invoke(new Action<string>(s => { Caption = s; }), value);
        else
          networkItemsGroupBox.Text = value;
      }
    }
    public TreeView NetworkItemsTreeView {
      get { return networkItemsTreeView; }
    }
    protected INetworkItem selectedNetworkItem;
    public INetworkItem SelectedNetworkItem {
      get {
        return selectedNetworkItem;
      }
      protected set {
        if (selectedNetworkItem != value) {
          selectedNetworkItem = value;
          OnSelectedNetworkItemChanged();
        }
      }
    }

    public NetworkItemSelector() {
      InitializeComponent();
      root = null;
      networkItemCondition = null;
      selectedNetworkItem = null;
    }

    public virtual void Configure(INetworkItem root) {
      Configure(root, null, (e) => true);
    }
    public virtual void Configure(INetworkItem root, INetworkItem selectedNetworkItem) {
      Configure(root, selectedNetworkItem, (e) => true);
    }
    public virtual void Configure(INetworkItem root, INetworkItem selectedNetworkItem, Type networkItemType) {
      Configure(root, selectedNetworkItem, (e) => { return networkItemType.IsAssignableFrom(e.GetType()); });
    }
    public virtual void Configure(INetworkItem root, INetworkItem selectedNetworkItem, Func<INetworkItem, bool> networkItemCondition) {
      if (root == null) throw new ArgumentNullException("root");
      if (networkItemCondition == null) throw new ArgumentNullException("networkItemCondition");
      if (InvokeRequired)
        Invoke(new Action<INetworkItem, INetworkItem, Func<INetworkItem, bool>>(Configure), root, selectedNetworkItem, networkItemCondition);
      else {
        this.root = root;
        this.networkItemCondition = networkItemCondition;
        this.selectedNetworkItem = null;
        networkItemsTreeView.Nodes.Clear();
        imageList.Images.Clear();

        TreeNode selectedNode;
        var n = CreateTreeNode(Root, selectedNetworkItem, networkItemCondition, out selectedNode);
        if (n != null)
          networkItemsTreeView.Nodes.Add(n);
        if (selectedNode != null) {
          networkItemsTreeView.SelectedNode = selectedNode;
          selectedNode.EnsureVisible();
        }
      }
    }

    public event EventHandler SelectedNetworkItemChanged;
    protected virtual void OnSelectedNetworkItemChanged() {
      var handler = SelectedNetworkItemChanged;
      if (handler != null) SelectedNetworkItemChanged(this, EventArgs.Empty);
    }

    #region Control Events
    protected virtual void networkItemsTreeView_AfterSelect(object sender, TreeViewEventArgs e) {
      if (networkItemsTreeView.SelectedNode == null)
        SelectedNetworkItem = null;
      else {
        var selected = (INetworkItem)networkItemsTreeView.SelectedNode.Tag;
        SelectedNetworkItem = ((networkItemCondition != null) && !networkItemCondition(selected)) ? null : selected;
      }
    }
    #endregion

    #region Helpers
    protected virtual TreeNode CreateTreeNode(INetworkItem networkItem, INetworkItem selectedNetworkItem, Func<INetworkItem, bool> networkItemCondition, out TreeNode selectedNode) {
      selectedNode = null;
      if (networkItem == null) return null;

      TreeNode node = new TreeNode(networkItem.Name);
      node.Tag = networkItem;
      foreach (var child in networkItem.Children) {
        TreeNode selected;
        var n = CreateTreeNode(child, selectedNetworkItem, networkItemCondition, out selected);
        if (n != null) {
          node.Nodes.Add(n);
          if (selected != null) selectedNode = selected;
        }

      }
      if (!networkItemCondition(networkItem) && (node.Nodes.Count == 0))
        return null;

      imageList.Images.Add(networkItem.ItemImage);
      node.ImageIndex = imageList.Images.Count - 1;
      node.SelectedImageIndex = node.ImageIndex;
      node.ToolTipText = networkItem.GetType().GetPrettyName();

      if (networkItem == selectedNetworkItem) selectedNode = node;
      return node;
    }
    #endregion
  }
}