#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.Resources;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;
using HeuristicLab.PluginInfrastructure;
using System;
using System.CodeDom.Compiler;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Windows.Forms;

namespace HeuristicLab.Scripting.Views {
  [View("ProgrammableItem View")]
  [Content(typeof(IProgrammableItem), false)]
  public partial class ProgrammableItemView : ItemView {
    public new IProgrammableItem Content {
      get { return (IProgrammableItem)base.Content; }
      set { base.Content = value; }
    }

    public ProgrammableItemView() {
      InitializeComponent();
      errorsListView.SmallImageList.Images.AddRange(new Image[] { VSImageLibrary.Warning, VSImageLibrary.Error });
    }

    protected override void DeregisterContentEvents() {
      Content.CodeChanged -= Content_CodeChanged;
      base.DeregisterContentEvents();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.CodeChanged += Content_CodeChanged;
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      errorsListView.Items.Clear();
      if (Content == null) {
        codeEditor.UserCode = string.Empty;
        variableStoreView.Content = null;
      } else {
        codeEditor.UserCode = Content.Code;
        foreach (var asm in Content.GetAssemblies())
          codeEditor.AddAssembly(asm);
        variableStoreView.Content = Content.VariableStore;
      }
      ShowCompilationResults();
      UpdateCompilationLabel();
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      compileButton.Enabled = Content != null && Content.CanChangeCode && !Locked && !ReadOnly;
      codeEditor.Enabled = Content != null && !Locked;
      codeEditor.ReadOnly = ReadOnly || Locked || ((Content != null) && !Content.CanChangeCode);
      variableStoreView.ReadOnly = (Content != null) && !Content.CanChangeCode;
    }

    protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, Keys keyData) {
      switch (keyData) {
        case Keys.F6:
          if (Content != null && !Locked)
            Compile();
          return true;
      }
      return base.ProcessCmdKey(ref msg, keyData);
    }

    protected virtual void Content_CodeChanged(object sender, EventArgs e) {
      if (InvokeRequired)
        Invoke(new EventHandler(Content_CodeChanged), sender, e);
      else {
        codeEditor.UserCode = Content.Code;
      }
    }

    private void compileButton_Click(object sender, EventArgs e) {
      Compile();
    }
    private void codeEditor_Validated(object sender, EventArgs e) {
      if ((Content != null) && Content.CanChangeCode) Content.Code = codeEditor.UserCode;
    }
    private void errorsListView_DoubleClick(object sender, EventArgs e) {
      if ((Content != null) && (Content.CompileErrors != null)) {
        codeEditor.ShowCompileErrors(Content.CompileErrors);
      }
    }

    #region Helpers
    protected virtual void Compile() {
      ReadOnly = true;
      Locked = true;
      errorsListView.Items.Clear();
      try {
        Content.Compile();
      } catch (Exception ex) {
        if (!(ex is InvalidOperationException) || (Content.CompileErrors == null))
          ErrorHandling.ShowErrorDialog(this, ex);
      }
      ShowCompilationResults();
      UpdateCompilationLabel();
      ReadOnly = false;
      Locked = false;
    }

    protected virtual void ShowCompilationResults() {
      if ((Content == null) || (Content.CompileErrors == null) || (Content.CompileErrors.Count == 0)) return;
      var errors = Content.CompileErrors.OfType<CompilerError>()
                                      .OrderBy(x => x.IsWarning)
                                      .ThenBy(x => x.Line)
                                      .ThenBy(x => x.Column);
      foreach (var e in errors) {
        var item = new ListViewItem();
        item.SubItems.AddRange(new[] {
          e.IsWarning ? "Warning" : "Error",
          e.ErrorNumber,
          e.Line.ToString(CultureInfo.InvariantCulture),
          e.Column.ToString(CultureInfo.InvariantCulture),
          e.ErrorText
        });
        item.ImageIndex = e.IsWarning ? 0 : 1;
        errorsListView.Items.Add(item);
      }

      foreach (ColumnHeader ch in errorsListView.Columns) {
        // adjusts column width to width of column header
        ch.Width = -2;
      }

      codeEditor.ShowCompileErrors(Content.CompileErrors);
    }

    protected virtual void UpdateCompilationLabel() {
      if ((Content == null) || (Content.CompileErrors == null)) {
        compilationLabel.ForeColor = SystemColors.ControlDarkDark;
        compilationLabel.Text = "Not compiled";
      } else if (Content.CompileErrors.HasErrors) {
        compilationLabel.ForeColor = Color.DarkRed;
        compilationLabel.Text = "Compilation failed";
      } else {
        compilationLabel.ForeColor = Color.DarkGreen;
        compilationLabel.Text = "Compilation successful";
      }
    }
    #endregion
  }
}