#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2019 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.Collections.Generic;
using System.Windows.Forms;
using HeuristicLab.MainForm;
using HeuristicLab.MainForm.WindowsForms;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Views {
  [View("SymbolicExpression View")]
  [Content(typeof(ISymbolicExpressionTree), false)]
  public partial class SymbolicExpressionView : AsynchronousContentView {
    private readonly List<ISymbolicExpressionTreeStringFormatter> treeFormattersList = new List<ISymbolicExpressionTreeStringFormatter>();

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

    public SymbolicExpressionView() {
      InitializeComponent();
      IEnumerable<ISymbolicExpressionTreeStringFormatter> formatters = ApplicationManager.Manager.GetInstances<ISymbolicExpressionTreeStringFormatter>();
      treeFormattersList = new List<ISymbolicExpressionTreeStringFormatter>();
      foreach (ISymbolicExpressionTreeStringFormatter formatter in formatters) {
        treeFormattersList.Add(formatter);
        formattersComboBox.Items.Add(formatter.Name);
      }
      if (formattersComboBox.Items.Count > 0)
        formattersComboBox.SelectedIndex = treeFormattersList.FindIndex(0, treeFormattersList.Count, (f) => f.Name.Contains("Default"));
      else
        formattersComboBox.SelectedIndex = -1;
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      UpdateTextbox();
    }

    private void UpdateTextbox() {
      if (Content == null || formattersComboBox.SelectedIndex < 0)
        textBox.Text = string.Empty;
      else {
        try {
          textBox.Text = treeFormattersList[formattersComboBox.SelectedIndex].Format(Content);
        }
        catch (ArgumentException) { textBox.Text = "Cannot format the symbolic expression tree with the selected formatter."; }
        catch (NotSupportedException) { textBox.Text = "Formatting of the symbolic expression tree is not supported by the selected formatter."; }
      }
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      textBox.Enabled = Content != null;
      textBox.ReadOnly = ReadOnly;
    }

    private void formattersComboBox_SelectedIndexChanged(object sender, System.EventArgs e) {
      UpdateTextbox();
    }

  }
}