#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.Collections.Generic;
using System.IO;
using System.Windows.Controls;
using System.Windows.Input;
using System.Xml;
using ICSharpCode.AvalonEdit.CodeCompletion;
using ICSharpCode.AvalonEdit.Highlighting;
using ICSharpCode.AvalonEdit.Highlighting.Xshd;

namespace HeuristicLab.Problems.GPDL.Views {
  /// <summary>
  /// Interaction logic for CodeEditor.xaml
  /// </summary>
  public partial class CodeEditor : UserControl {
    public string syntaxHighlighting { get; set; }
    private bool controlHeld = false;
    private CompletionWindow completionWindow;
    private ColorizeErrors errorLineTransformer;

    public CodeEditor() {
      InitializeComponent();

      LoadSyntaxHighlighting();

      // for auto-completion
      textEditor.TextArea.TextEntered += textEditor_TextArea_TextEntered;
      // show errors visually
      errorLineTransformer = new ColorizeErrors();
      textEditor.TextArea.TextView.LineTransformers.Add(errorLineTransformer);
    }

    private void textEditor_TextArea_TextEntered(object sender, TextCompositionEventArgs e) {
      if (e.Text == ".") {
        // Open code completion after the user has pressed dot:
        completionWindow = new CompletionWindow(textEditor.TextArea);
        IList<ICompletionData> data = completionWindow.CompletionList.CompletionData;
        data.Add(new MyCompletionData("Item1"));
        data.Add(new MyCompletionData("Item2"));
        data.Add(new MyCompletionData("Item3"));
        completionWindow.Show();
        completionWindow.Closed += delegate {
          completionWindow = null;
        };
      }
    }


    private void LoadSyntaxHighlighting() {
      textEditor.ShowLineNumbers = true;

      using (var s = new StringReader(Properties.Resources.GPDL)) {
        using (XmlTextReader reader = new XmlTextReader(s)) {
          textEditor.SyntaxHighlighting = HighlightingLoader.Load(reader, HighlightingManager.Instance);

        }
      }
    }

    private void textEditor_MouseWheel(object sender, MouseWheelEventArgs e) {
    }

    private void textEditor_KeyDown(object sender, KeyEventArgs e) {
      if (e.Key == Key.LeftCtrl || e.Key == Key.RightCtrl) controlHeld = true;
    }

    private void textEditor_KeyUp(object sender, KeyEventArgs e) {
      controlHeld = false;
    }

    internal void SetLexError(string msg, int line, int col) {
      errorLineTransformer.MarkLexError(msg, line, col);
      textEditor.TextArea.TextView.Redraw();
    }

    internal void SetSynError(string msg, int line, int col) {
      errorLineTransformer.MarkSynError(msg, line, col);
      textEditor.TextArea.TextView.Redraw();
    }

    internal void ClearErrors() {
      errorLineTransformer.ClearErrors();
      textEditor.TextArea.TextView.Redraw();
    }

    private void textEditor_PreviewMouseWheel(object sender, MouseWheelEventArgs e) {
      if (!controlHeld) return;
      if (e.Delta > 0)
        textEditor.FontSize += 1;
      else textEditor.FontSize -= 1;
      e.Handled = true;
    }
  }
}