/*

Copyright (C) 2011-2017 Jacob Dawid

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

// Programming Note: this file has many lines longer than 80 characters
// due to long function, variable, and property names.  Please don't
// break those lines as it tends to make this code even harder to read.

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include "resource-manager.h"
#include "shortcut-manager.h"
#include "variable-editor.h"
#include "workspace-model.h"
#include "settings-dialog.h"
#include "ui-settings-dialog.h"
#include <QDir>
#include <QFileInfo>
#include <QFileDialog>
#include <QVector>
#include <QHash>
#include <QMessageBox>
#include <QTextCodec>

#if defined (HAVE_QSCINTILLA)
#  include "octave-qscintilla.h"
#  include "octave-txt-lexer.h"
#  include <QScrollArea>

#  if defined (HAVE_QSCI_QSCILEXEROCTAVE_H)
#    define HAVE_LEXER_OCTAVE 1
#    include <Qsci/qscilexeroctave.h>
#  elif defined (HAVE_QSCI_QSCILEXERMATLAB_H)
#    define HAVE_LEXER_MATLAB 1
#    include <Qsci/qscilexermatlab.h>
#  endif

#  include <Qsci/qscilexercpp.h>
#  include <Qsci/qscilexerbash.h>
#  include <Qsci/qscilexerperl.h>
#  include <Qsci/qscilexerbatch.h>
#  include <Qsci/qscilexerdiff.h>
#endif

#if defined (HAVE_QSCINTILLA)

static const int MaxLexerStyles = 64;
static const int MaxStyleNumber = 128;

static int
get_valid_lexer_styles (QsciLexer *lexer, int styles[])
{
  int max_style = 0;
  int actual_style = 0;
  while (actual_style < MaxStyleNumber && max_style < MaxLexerStyles)
    {
      if ((lexer->description (actual_style)) != "")  // valid style
        styles[max_style++] = actual_style;
      actual_style++;
    }
  return max_style;
}

static void
read_lexer_settings (Ui::settings_dialog *ui, QsciLexer *lexer, QSettings *settings)
{
  lexer->readSettings (*settings);
  int styles[MaxLexerStyles];  // array for saving valid styles
                               // (enum is not continuous)
  int max_style = get_valid_lexer_styles (lexer, styles);
  QGridLayout *style_grid = new QGridLayout ();
  QVector<QLabel*> description (max_style);
  QVector<QFontComboBox*> select_font (max_style);
  QVector<QSpinBox*> font_size (max_style);
  QVector<QCheckBox*> attrib_font (3 * max_style);
  QVector<color_picker*> color (max_style);
  QVector<color_picker*> bg_color (max_style);
  int default_size = 10;
  QFont default_font = QFont ();
  int label_width;
  QColor default_color = QColor ();
  QColor dummy_color = QColor (255, 0, 255);

  for (int i = 0; i < max_style; i++)  // create dialog elements for all styles
    {
      QString actual_name = lexer->description (styles[i]);
      QFont   actual_font = lexer->font (styles[i]);
      description[i] = new QLabel (actual_name);
      description[i]->setWordWrap (true);
      label_width = 24*description[i]->fontMetrics ().averageCharWidth ();
      description[i]->setMaximumSize (label_width, QWIDGETSIZE_MAX);
      description[i]->setMinimumSize (label_width, 1);
      select_font[i] = new QFontComboBox ();
      select_font[i]->setObjectName (actual_name + "_font");
      select_font[i]->setMaximumSize (label_width, QWIDGETSIZE_MAX);
      select_font[i]->setMinimumSize (label_width, 1);
      font_size[i] = new QSpinBox ();
      font_size[i]->setObjectName (actual_name + "_size");
      if (styles[i] == 0) // the default
        {
          select_font[i]->setCurrentFont (actual_font);
          default_font = actual_font;
          font_size[i]->setRange (6, 24);
          default_size = actual_font.pointSize ();
          font_size[i]->setValue (default_size);
          default_color = lexer->defaultPaper ();
          bg_color[i] = new color_picker (default_color);
        }
      else   // other styles
        {
          select_font[i]->setCurrentFont (actual_font);
          if (actual_font.family () == default_font.family ())
            select_font[i]->setEditText (lexer->description (0));
          font_size[i]->setRange (-4, 4);
          font_size[i]->setValue (actual_font.pointSize ()-default_size);
          font_size[i]->setToolTip (QObject::tr ("Difference to the default size"));
          if (lexer->paper (styles[i]) == default_color)
            bg_color[i] = new color_picker (dummy_color);
          else
            bg_color[i] = new color_picker (lexer->paper (styles[i]));
          bg_color[i]->setToolTip
            (QObject::tr ("Background color, pink (255, 0, 255) means default"));
        }
      attrib_font[0+3*i] = new QCheckBox (QObject::tr ("b", "short form for bold"));
      attrib_font[1+3*i] = new QCheckBox (QObject::tr ("i", "short form for italic"));
      attrib_font[2+3*i] = new QCheckBox (QObject::tr ("u", "short form for underlined"));
      attrib_font[0+3*i]->setChecked (actual_font.bold ());
      attrib_font[0+3*i]->setObjectName (actual_name + "_bold");
      attrib_font[1+3*i]->setChecked (actual_font.italic ());
      attrib_font[1+3*i]->setObjectName (actual_name + "_italic");
      attrib_font[2+3*i]->setChecked (actual_font.underline ());
      attrib_font[2+3*i]->setObjectName (actual_name + "_underline");
      color[i] = new color_picker (lexer->color (styles[i]));
      color[i]->setObjectName (actual_name + "_color");
      bg_color[i]->setObjectName (actual_name + "_bg_color");
      int column = 1;
      style_grid->addWidget (description[i], i, column++);
      style_grid->addWidget (select_font[i], i, column++);
      style_grid->addWidget (font_size[i], i, column++);
      style_grid->addWidget (attrib_font[0+3*i], i, column++);
      style_grid->addWidget (attrib_font[1+3*i], i, column++);
      style_grid->addWidget (attrib_font[2+3*i], i, column++);
      style_grid->addWidget (color[i], i, column++);
      style_grid->addWidget (bg_color[i], i, column++);
    }
  // place grid with elements into the tab
  QScrollArea *scroll_area = new QScrollArea ();
  QWidget *scroll_area_contents = new QWidget ();
  scroll_area_contents->setObjectName (QString (lexer->language ()) + "_styles");
  scroll_area_contents->setLayout (style_grid);
  scroll_area->setWidget (scroll_area_contents);
  ui->tabs_editor_lexers->addTab (scroll_area, lexer->language ());

  ui->tabs_editor_lexers->setCurrentIndex (settings->value ("settings/last_editor_styles_tab", 0).toInt ());
}

static void
write_lexer_settings (Ui::settings_dialog *ui, QsciLexer *lexer, QSettings *settings)
{
  QWidget *tab = ui->tabs_editor_lexers->
    findChild <QWidget *> (QString (lexer->language ()) + "_styles");
  int styles[MaxLexerStyles];  // array for saving valid styles
                               // (enum is not continuous)
  int max_style = get_valid_lexer_styles (lexer, styles);
  QFontComboBox *select_font;
  QSpinBox *font_size;
  QCheckBox *attrib_font[3];
  color_picker *color;
  color_picker *bg_color;
  int default_size = 10;
  QFont default_font = QFont ("Courier New", 10, -1, 0);
  QColor default_color = QColor ();
  QColor dummy_color = QColor (255, 0, 255);

  for (int i = 0; i < max_style; i++)  // get dialog elements and their contents
    {
      QString actual_name = lexer->description (styles[i]);
      select_font = tab->findChild <QFontComboBox *> (actual_name + "_font");
      font_size = tab->findChild <QSpinBox *> (actual_name + "_size");
      attrib_font[0] = tab->findChild <QCheckBox *> (actual_name + "_bold");
      attrib_font[1] = tab->findChild <QCheckBox *> (actual_name + "_italic");
      attrib_font[2] = tab->findChild <QCheckBox *> (actual_name + "_underline");
      color = tab->findChild <color_picker *> (actual_name + "_color");
      bg_color = tab->findChild <color_picker *> (actual_name + "_bg_color");
      QFont new_font = default_font;
      if (select_font)
        {
          new_font = select_font->currentFont ();
          if (styles[i] == 0)
            default_font = new_font;
          else if (select_font->currentText () == lexer->description (0))
            new_font = default_font;
        }
      if (font_size)
        {
          if (styles[i] == 0)
            {
              default_size = font_size->value ();
              new_font.setPointSize (font_size->value ());
            }
          else
            new_font.setPointSize (font_size->value ()+default_size);
        }
      if (attrib_font[0])
        new_font.setBold (attrib_font[0]->isChecked ());
      if (attrib_font[1])
        new_font.setItalic (attrib_font[1]->isChecked ());
      if (attrib_font[2])
        new_font.setUnderline (attrib_font[2]->isChecked ());
      lexer->setFont (new_font, styles[i]);
      if (styles[i] == 0)
        lexer->setDefaultFont (new_font);
      if (color)
        lexer->setColor (color->color (), styles[i]);
      if (bg_color)
        {
          if (styles[i] == 0)
            {
              default_color = bg_color->color ();
              lexer->setPaper (default_color, styles[i]);
              lexer->setDefaultPaper (default_color);
            }
          else
            {
              if (bg_color->color () == dummy_color)
                lexer->setPaper (default_color, styles[i]);
              else
                lexer->setPaper (bg_color->color (), styles[i]);
            }
        }
    }

  lexer->writeSettings (*settings);

  settings->setValue ("settings/last_editor_styles_tab", ui->tabs_editor_lexers->currentIndex ());
  settings->sync ();
}

#endif

settings_dialog::settings_dialog (QWidget *p, const QString& desired_tab):
  QDialog (p), ui (new Ui::settings_dialog)
{
  ui->setupUi (this);

  QSettings *settings = resource_manager::get_settings ();

  if (! settings)
    {
      QMessageBox msgBox
        (QMessageBox::Warning, tr ("Octave Settings"),
         tr ("Unable to save settings.  Missing settings file or unknown directory."));

      msgBox.exec ();

      return;
    }

  // restore last geometry
  restoreGeometry (settings->value ("settings/geometry").toByteArray ());

  // look for available language files and the actual settings
  QString qm_dir_name = resource_manager::get_gui_translation_dir ();
  QDir qm_dir (qm_dir_name);
  QFileInfoList qm_files = qm_dir.entryInfoList (QStringList ("*.qm"), QDir::Files | QDir::Readable, QDir::Name);

  for (int i = 0; i < qm_files.length (); i++)   // insert available languages
    ui->comboBox_language->addItem (qm_files.at (i).baseName ());
  // System at beginning
  ui->comboBox_language->insertItem (0, tr ("System setting"));
  ui->comboBox_language->insertSeparator (1);    // separator after System
  QString language = settings->value ("language", "SYSTEM").toString ();
  if (language == "SYSTEM")
    language = tr ("System setting");
  int selected = ui->comboBox_language->findText (language);
  if (selected >= 0)
    ui->comboBox_language->setCurrentIndex (selected);
  else
    ui->comboBox_language->setCurrentIndex (0);  // System is default

  // icon size
  QButtonGroup *icon_size_group = new QButtonGroup (this);
  icon_size_group->addButton (ui->icon_size_small);
  icon_size_group->addButton (ui->icon_size_normal);
  icon_size_group->addButton (ui->icon_size_large);
  int icon_size = settings->value ("toolbar_icon_size", 0).toInt ();
  ui->icon_size_normal->setChecked (true);  // the default
  ui->icon_size_small->setChecked (icon_size == -1);
  ui->icon_size_large->setChecked (icon_size == 1);

  // which icon has to be selected
  QButtonGroup *icon_group = new QButtonGroup (this);
  icon_group->addButton (ui->general_icon_octave);
  icon_group->addButton (ui->general_icon_graphic);
  icon_group->addButton (ui->general_icon_letter);
  QString widget_icon_set =
    settings->value ("DockWidgets/widget_icon_set", "NONE").toString ();
  ui->general_icon_octave->setChecked (true);  // the default (if invalid set)
  ui->general_icon_octave->setChecked (widget_icon_set == "NONE");
  ui->general_icon_graphic->setChecked (widget_icon_set == "GRAPHIC");
  ui->general_icon_letter->setChecked (widget_icon_set == "LETTER");

  // custom title bar of dock widget
  QVariant default_var = QColor (255, 255, 255);
  QColor bg_color = settings->value ("DockWidgets/title_bg_color", default_var).value<QColor> ();
  m_widget_title_bg_color = new color_picker (bg_color);
  m_widget_title_bg_color->setEnabled (false);
  ui->layout_widget_bgtitle->addWidget (m_widget_title_bg_color, 0);

  connect (ui->cb_widget_custom_style, SIGNAL (toggled (bool)),
           m_widget_title_bg_color, SLOT (setEnabled (bool)));

  default_var = QColor (192, 192, 192);
  QColor bg_color_active = settings->value ("DockWidgets/title_bg_color_active", default_var).value<QColor> ();
  m_widget_title_bg_color_active = new color_picker (bg_color_active);
  m_widget_title_bg_color_active->setEnabled (false);
  ui->layout_widget_bgtitle_active->addWidget (m_widget_title_bg_color_active, 0);

  connect (ui->cb_widget_custom_style, SIGNAL (toggled (bool)),
           m_widget_title_bg_color_active, SLOT (setEnabled (bool)));

  default_var = QColor (0, 0, 0);
  QColor fg_color = settings->value ("DockWidgets/title_fg_color", default_var).value<QColor> ();
  m_widget_title_fg_color = new color_picker (fg_color);
  m_widget_title_fg_color->setEnabled (false);
  ui->layout_widget_fgtitle->addWidget (m_widget_title_fg_color, 0);

  connect (ui->cb_widget_custom_style, SIGNAL (toggled (bool)),
           m_widget_title_fg_color, SLOT (setEnabled (bool)));

  default_var = QColor (0, 0, 0);
  QColor fg_color_active = settings->value ("DockWidgets/title_fg_color_active", default_var).value<QColor> ();
  m_widget_title_fg_color_active = new color_picker (fg_color_active);
  m_widget_title_fg_color_active->setEnabled (false);
  ui->layout_widget_fgtitle_active->addWidget (m_widget_title_fg_color_active, 0);

  connect (ui->cb_widget_custom_style, SIGNAL (toggled (bool)),
           m_widget_title_fg_color_active, SLOT (setEnabled (bool)));

  ui->sb_3d_title->setValue (settings->value ("DockWidgets/widget_title_3d", 50).toInt ());
  ui->cb_widget_custom_style->setChecked (settings->value ("DockWidgets/widget_title_custom_style", false).toBool ());

  // Cursor blinking: consider old terminal related setting if not yet set
  // TODO: This pref. can be deprecated / removed if Qt adds support for
  //       getting the cursor blink preferences from all OS environments
  if (settings->contains ("cursor_blinking"))
    {
      // Preference exists, read its value
      ui->cb_cursor_blinking->setChecked (settings->value ("cursor_blinking", true).toBool ());
    }
  else
    {
      // Pref. does not exist, so take old terminal related pref.
      ui->cb_cursor_blinking->setChecked (settings->value ("terminal/cursorBlinking", true).toBool ());
    }

  // prompt on exit
  ui->cb_prompt_to_exit->setChecked (settings->value ("prompt_to_exit", false).toBool ());

  // Main status bar
  ui->cb_status_bar->setChecked (settings->value ("show_status_bar", true).toBool ());

  // Octave startup
  ui->cb_restore_octave_dir->setChecked (settings->value ("restore_octave_dir", false).toBool ());
  ui->le_octave_dir->setText (settings->value ("octave_startup_dir").toString ());

  connect (ui->pb_octave_dir, SIGNAL (pressed (void)),
           this, SLOT (get_octave_dir (void)));

  //
  // editor
  //
  ui->useCustomFileEditor->setChecked (settings->value ("useCustomFileEditor", false).toBool ());
  ui->customFileEditor->setText (settings->value ("customFileEditor").toString ());
  ui->editor_showLineNumbers->setChecked (settings->value ("editor/showLineNumbers", true).toBool ());
  ui->editor_linenr_size->setValue (settings->value ("editor/line_numbers_size", 0).toInt ());

  resource_manager::combo_encoding (ui->editor_combo_encoding);

  default_var = QColor (240, 240, 240);
  QColor setting_color = settings->value ("editor/highlight_current_line_color", default_var).value<QColor> ();
  m_editor_current_line_color = new color_picker (setting_color);
  ui->editor_grid_current_line->addWidget (m_editor_current_line_color, 0, 3);
  m_editor_current_line_color->setMinimumSize (20, 10);
  m_editor_current_line_color->setEnabled (false);

  connect (ui->editor_highlightCurrentLine, SIGNAL (toggled (bool)),
           m_editor_current_line_color, SLOT (setEnabled (bool)));

  ui->editor_highlightCurrentLine->setChecked (settings->value ("editor/highlightCurrentLine", true).toBool ());
  ui->editor_long_line_marker->setChecked (settings->value ("editor/long_line_marker", true).toBool ());
  bool long_line =
    settings->value ("editor/long_line_marker_line", true).toBool ();
  ui->editor_long_line_marker_line->setChecked (long_line);
  bool long_back =
    settings->value ("editor/long_line_marker_background", false).toBool ();
  ui->editor_long_line_marker_background->setChecked (long_back);
  if (! (long_line || long_back))
    ui->editor_long_line_marker_line->setChecked (true);
  ui->editor_long_line_column->setValue (settings->value ("editor/long_line_column", 80).toInt ());
  ui->editor_break_checkbox->setChecked (settings->value ("editor/break_lines", false).toBool ());
  ui->editor_break_checkbox->setChecked (settings->value ("editor/break_lines_comments", false).toBool ());
  ui->editor_wrap_checkbox->setChecked (settings->value ("editor/wrap_lines", false).toBool ());
  ui->cb_edit_status_bar->setChecked (settings->value ("editor/show_edit_status_bar", true).toBool ());
  ui->cb_edit_tool_bar->setChecked (settings->value ("editor/show_toolbar", true).toBool ());
  ui->cb_code_folding->setChecked (settings->value ("editor/code_folding", true).toBool ());
  ui->editor_highlight_all_occurrences->setChecked (settings->value ("editor/highlight_all_occurrences", true).toBool ());

  ui->editor_auto_endif->setCurrentIndex (settings->value ("editor/auto_endif", 1).toInt () );
  ui->editor_codeCompletion->setChecked (settings->value ("editor/codeCompletion", true).toBool ());
  ui->editor_spinbox_ac_threshold->setValue (settings->value ("editor/codeCompletion_threshold", 2).toInt ());
  ui->editor_checkbox_ac_keywords->setChecked (settings->value ("editor/codeCompletion_keywords", true).toBool ());
  ui->editor_checkbox_ac_builtins->setEnabled (ui->editor_checkbox_ac_keywords->isChecked ());
  ui->editor_checkbox_ac_functions->setEnabled (ui->editor_checkbox_ac_keywords->isChecked ());
  ui->editor_checkbox_ac_builtins->setChecked (settings->value ("editor/codeCompletion_octave_builtins", true).toBool ());
  ui->editor_checkbox_ac_functions->setChecked (settings->value ("editor/codeCompletion_octave_functions", true).toBool ());
  ui->editor_checkbox_ac_document->setChecked (settings->value ("editor/codeCompletion_document", false).toBool ());
  ui->editor_checkbox_ac_case->setChecked (settings->value ("editor/codeCompletion_case", true).toBool ());
  ui->editor_checkbox_ac_replace->setChecked (settings->value ("editor/codeCompletion_replace", false).toBool ());
  ui->editor_ws_checkbox->setChecked (settings->value ("editor/show_white_space", false).toBool ());
  ui->editor_ws_indent_checkbox->setChecked (settings->value ("editor/show_white_space_indent", false).toBool ());
  ui->cb_show_eol->setChecked (settings->value ("editor/show_eol_chars", false).toBool ());
  ui->cb_show_hscrollbar->setChecked (settings->value ("editor/show_hscroll_bar", true).toBool ());
  ui->combo_oct_comment_str->setCurrentIndex (settings->value ("editor/octave_comment_string", 0).toInt ());

#if defined (HAVE_QSCINTILLA)
#  if defined (Q_OS_WIN32)
  int eol_mode = QsciScintilla::EolWindows;
#elif defined (Q_OS_MAC)
  int eol_mode = QsciScintilla::EolMac;
#else
  int eol_mode = QsciScintilla::EolUnix;
#endif
#else
  int eol_mode = 2;
#endif
  ui->combo_eol_mode->setCurrentIndex (settings->value ("editor/default_eol_mode", eol_mode).toInt ());
  ui->editor_auto_ind_checkbox->setChecked (settings->value ("editor/auto_indent", true).toBool ());
  ui->editor_tab_ind_checkbox->setChecked (settings->value ("editor/tab_indents_line", false).toBool ());
  ui->editor_bs_unind_checkbox->setChecked (settings->value ("editor/backspace_unindents_line", false).toBool ());
  ui->editor_ind_guides_checkbox->setChecked (settings->value ("editor/show_indent_guides", false).toBool ());
  ui->editor_ind_width_spinbox->setValue (settings->value ("editor/indent_width", 2).toInt ());
  ui->editor_ind_uses_tabs_checkbox->setChecked (settings->value ("editor/indent_uses_tabs", false).toBool ());
  ui->editor_tab_width_spinbox->setValue (settings->value ("editor/tab_width", 2).toInt ());
  ui->editor_longWindowTitle->setChecked (settings->value ("editor/longWindowTitle", false).toBool ());
  ui->editor_notebook_tab_width_min->setValue (settings->value ("editor/notebook_tab_width_min", 160).toInt ());
  ui->editor_notebook_tab_width_max->setValue (settings->value ("editor/notebook_tab_width_max", 300).toInt ());
  ui->editor_restoreSession->setChecked (settings->value ("editor/restoreSession", true).toBool ());
  ui->editor_create_new_file->setChecked (settings->value ("editor/create_new_file", false).toBool ());
  ui->editor_reload_changed_files->setChecked (settings->value ("editor/always_reload_changed_files", false).toBool ());
  ui->editor_hiding_closes_files->setChecked (settings->value ("editor/hiding_closes_files", false).toBool ());

  // terminal
  ui->terminal_fontName->setCurrentFont (QFont (settings->value ("terminal/fontName", "Courier New").toString ()));
  ui->terminal_fontSize->setValue (settings->value ("terminal/fontSize", 10).toInt ());
  ui->terminal_history_buffer->setValue (settings->value ("terminal/history_buffer", 1000).toInt ());
  ui->terminal_cursorUseForegroundColor->setChecked (settings->value ("terminal/cursorUseForegroundColor", true).toBool ());
  ui->terminal_focus_command->setChecked (settings->value ("terminal/focus_after_command", false).toBool ());
  ui->terminal_print_dbg_location->setChecked (settings->value ("terminal/print_debug_location", false).toBool ());

  QString cursorType
    = settings->value ("terminal/cursorType", "ibeam").toString ();

  QStringList items;
  items << QString ("0") << QString ("1") << QString ("2");
  ui->terminal_cursorType->addItems (items);
  ui->terminal_cursorType->setItemText (0, tr ("IBeam Cursor"));
  ui->terminal_cursorType->setItemText (1, tr ("Block Cursor"));
  ui->terminal_cursorType->setItemText (2, tr ("Underline Cursor"));

  if (cursorType == "ibeam")
    ui->terminal_cursorType->setCurrentIndex (0);
  else if (cursorType == "block")
    ui->terminal_cursorType->setCurrentIndex (1);
  else if (cursorType == "underline")
    ui->terminal_cursorType->setCurrentIndex (2);

  // file browser
  connect (ui->sync_octave_directory, SIGNAL (toggled (bool)),
           this, SLOT (set_disabled_pref_file_browser_dir (bool)));

  ui->sync_octave_directory->setChecked (settings->value ("filesdockwidget/sync_octave_directory", true).toBool ());
  ui->cb_restore_file_browser_dir->setChecked (settings->value ("filesdockwidget/restore_last_dir", false).toBool ());
  ui->le_file_browser_dir->setText (settings->value ("filesdockwidget/startup_dir").toString ());

  connect (ui->pb_file_browser_dir, SIGNAL (pressed (void)),
           this, SLOT (get_file_browser_dir (void)));

  ui->le_file_browser_extensions->setText (settings->value ("filesdockwidget/txt_file_extensions", "m;c;cc;cpp;h;txt").toString ());

  ui->checkbox_allow_web_connect->setChecked (settings->value ("news/allow_web_connection", false).toBool ());
  ui->useProxyServer->setChecked (settings->value ("useProxyServer", false).toBool ());
  ui->proxyHostName->setText (settings->value ("proxyHostName").toString ());

  int currentIndex = 0;
  QString proxyTypeString = settings->value ("proxyType").toString ();
  while ((currentIndex < ui->proxyType->count ())
         && (ui->proxyType->currentText () != proxyTypeString))
    {
      currentIndex++;
      ui->proxyType->setCurrentIndex (currentIndex);
    }

  ui->proxyPort->setText (settings->value ("proxyPort").toString ());
  ui->proxyUserName->setText (settings->value ("proxyUserName").toString ());
  ui->proxyPassword->setText (settings->value ("proxyPassword").toString ());

  // Workspace
  // colors
  read_workspace_colors (settings);
  // hide tool tips
  ui->cb_hide_tool_tips->setChecked (settings->value ("workspaceview/hide_tool_tips", false).toBool ());

  // terminal colors
  read_terminal_colors (settings);

  // variable editor
  ui->varedit_columnWidth->setText (settings->value ("variable_editor/column_width", "100").toString ());
  ui->varedit_autoFitColumnWidth->setChecked (settings->value ("variable_editor/autofit_column_width", false).toBool ());
  ui->varedit_autofitType->setCurrentIndex (settings->value ("autofit_type", 0).toInt ());
  ui->varedit_rowHeight->setText (settings->value ("variable_editor/row_height", "2").toString ());
  ui->varedit_rowAutofit->setChecked (settings->value ("variable_editor/autofit_row_height", true).toBool ());
  ui->varedit_font->setFont (QFont (settings->value ("variable_editor/font_name", settings->value ("terminal/fontName", "Courier New")).toString ()));
  ui->varedit_fontSize->setValue (settings->value ("variable_editor/font_size", QVariant (10)).toInt ());
  ui->varedit_useTerminalFont->setChecked (settings->value ("variable_editor/use_terminal_font", false).toBool ());
  ui->varedit_alternate->setChecked (settings->value ("variable_editor/alternate_rows", QVariant (false)).toBool ());

  // variable editor colors
  read_varedit_colors (settings);

  // shortcuts

  ui->cb_prevent_readline_conflicts->setChecked (settings->value ("shortcuts/prevent_readline_conflicts", true).toBool ());

  // initialize the tree view with all shortcut data
  shortcut_manager::fill_treewidget (ui->shortcuts_treewidget);

  // connect the buttons for import/export of the shortcut sets
  connect (ui->btn_import_shortcut_set, SIGNAL (clicked (void)),
           this, SLOT (import_shortcut_set (void)));

  connect (ui->btn_export_shortcut_set, SIGNAL (clicked (void)),
           this, SLOT (export_shortcut_set (void)));

  connect (ui->btn_default_shortcut_set, SIGNAL (clicked (void)),
           this, SLOT (default_shortcut_set (void)));

#if defined (HAVE_QSCINTILLA)

  // editor styles: create lexer, read settings, and create dialog elements
  QsciLexer *lexer;

#if defined (HAVE_LEXER_OCTAVE)

  lexer = new QsciLexerOctave ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

#elif defined (HAVE_LEXER_MATLAB)

  lexer = new QsciLexerMatlab ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

#endif

  lexer = new QsciLexerCPP ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerPerl ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerBatch ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerDiff ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerBash ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new octave_txt_lexer ();
  read_lexer_settings (ui, lexer, settings);
  delete lexer;

#endif

  // which tab is the desired one?
  show_tab (desired_tab);

  // connect button box signal
  connect (ui->button_box, SIGNAL (clicked (QAbstractButton *)),
           this, SLOT (button_clicked (QAbstractButton *)));
}

settings_dialog::~settings_dialog (void)
{
  delete ui;
}

void
settings_dialog::show_tab (const QString& tab)
{
  if (tab.isEmpty ())
    {
      QSettings *settings = resource_manager::get_settings ();
      if (settings)
        ui->tabWidget->setCurrentIndex (settings->value ("settings/last_tab", 0).toInt ());
    }
  else
    {
      QHash <QString, QWidget*> tab_hash;
      tab_hash["editor"] = ui->tab_editor;
      tab_hash["editor_styles"] = ui->tab_editor_styles;
      ui->tabWidget->setCurrentIndex (ui->tabWidget->indexOf (tab_hash.value (tab)));
    }
}

void
settings_dialog::get_octave_dir (void)
{
  get_dir (ui->le_octave_dir, tr ("Set Octave Startup Directory"));
}

void
settings_dialog::get_file_browser_dir (void)
{
  get_dir (ui->le_file_browser_dir, tr ("Set File Browser Startup Directory"));
}

void
settings_dialog::get_dir (QLineEdit *line_edit, const QString& title)
{
  QString dir = QFileDialog::getExistingDirectory
    (this, title, line_edit->text (), QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);

  line_edit->setText (dir);
}

void
settings_dialog::button_clicked (QAbstractButton *button)
{
  QDialogButtonBox::ButtonRole button_role = ui->button_box->buttonRole (button);

  if (button_role == QDialogButtonBox::ApplyRole
      || button_role == QDialogButtonBox::AcceptRole)
    {
      write_changed_settings (button_role == QDialogButtonBox::AcceptRole);
      emit apply_new_settings ();
    }

  if (button_role == QDialogButtonBox::RejectRole
      || button_role == QDialogButtonBox::AcceptRole)
    close ();
}

void
settings_dialog::set_disabled_pref_file_browser_dir (bool disable)
{
  ui->cb_restore_file_browser_dir->setDisabled (disable);

  if (! disable)
    {
      ui->le_file_browser_dir->setDisabled (ui->cb_restore_file_browser_dir->isChecked ());
      ui->pb_file_browser_dir->setDisabled (ui->cb_restore_file_browser_dir->isChecked ());
    }
  else
    {
      ui->le_file_browser_dir->setDisabled (disable);
      ui->pb_file_browser_dir->setDisabled (disable);
    }
}

// slots for import/export of shortcut sets
void
settings_dialog::import_shortcut_set (void)
{
  shortcut_manager::import_export (shortcut_manager::OSC_IMPORT);
}

void
settings_dialog::export_shortcut_set (void)
{
  shortcut_manager::import_export (shortcut_manager::OSC_EXPORT);
}

void
settings_dialog::default_shortcut_set (void)
{
  shortcut_manager::import_export (shortcut_manager::OSC_DEFAULT);
}

void
settings_dialog::write_changed_settings (bool closing)
{
  QSettings *settings = resource_manager::get_settings ();

  // the icon set
  QString widget_icon_set = "NONE";
  if (ui->general_icon_letter->isChecked ())
    widget_icon_set = "LETTER";
  else if (ui->general_icon_graphic->isChecked ())
    widget_icon_set = "GRAPHIC";
  settings->setValue ("DockWidgets/widget_icon_set", widget_icon_set);

  // language
  QString language = ui->comboBox_language->currentText ();
  if (language == tr ("System setting"))
    language = "SYSTEM";
  settings->setValue ("language", language);

  // dock widget title bar
  settings->setValue ("DockWidgets/widget_title_custom_style", ui->cb_widget_custom_style->isChecked ());
  settings->setValue ("DockWidgets/widget_title_3d", ui->sb_3d_title->value ());
  settings->setValue ("DockWidgets/title_bg_color", m_widget_title_bg_color->color ());
  settings->setValue ("DockWidgets/title_bg_color_active", m_widget_title_bg_color_active->color ());
  settings->setValue ("DockWidgets/title_fg_color", m_widget_title_fg_color->color ());
  settings->setValue ("DockWidgets/title_fg_color_active", m_widget_title_fg_color_active->color ());

  // icon size
  int icon_size = 0;
  if (ui->icon_size_small->isChecked ())
    icon_size = -1;
  else if (ui->icon_size_large->isChecked ())
    icon_size = 1;
  settings->setValue ("toolbar_icon_size", icon_size);

  // cursor blinking
  settings->setValue ("cursor_blinking", ui->cb_cursor_blinking->isChecked ());

  // promp to exit
  settings->setValue ("prompt_to_exit", ui->cb_prompt_to_exit->isChecked ());

  // status bar
  settings->setValue ("show_status_bar", ui->cb_status_bar->isChecked ());

  // Octave startup
  settings->setValue ("restore_octave_dir", ui->cb_restore_octave_dir->isChecked ());
  settings->setValue ("octave_startup_dir", ui->le_octave_dir->text ());

  //editor
  settings->setValue ("useCustomFileEditor", ui->useCustomFileEditor->isChecked ());
  settings->setValue ("customFileEditor", ui->customFileEditor->text ());
  settings->setValue ("editor/showLineNumbers", ui->editor_showLineNumbers->isChecked ());
  settings->setValue ("editor/line_numbers_size", ui->editor_linenr_size->value ());
  settings->setValue ("editor/highlightCurrentLine", ui->editor_highlightCurrentLine->isChecked ());
  settings->setValue ("editor/highlight_current_line_color", m_editor_current_line_color->color ());
  settings->setValue ("editor/long_line_marker", ui->editor_long_line_marker->isChecked ());
  settings->setValue ("editor/long_line_marker_line", ui->editor_long_line_marker_line->isChecked ());
  settings->setValue ("editor/long_line_marker_background", ui->editor_long_line_marker_background->isChecked ());
  settings->setValue ("editor/long_line_column", ui->editor_long_line_column->value ());
  settings->setValue ("editor/break_lines", ui->editor_break_checkbox->isChecked ());
  settings->setValue ("editor/break_lines_comments", ui->editor_break_comments_checkbox->isChecked ());
  settings->setValue ("editor/wrap_lines", ui->editor_wrap_checkbox->isChecked ());
  settings->setValue ("editor/code_folding", ui->cb_code_folding->isChecked ());
  settings->setValue ("editor/show_edit_status_bar", ui->cb_edit_status_bar->isChecked ());
  settings->setValue ("editor/show_toolbar", ui->cb_edit_tool_bar->isChecked ());
  settings->setValue ("editor/highlight_all_occurrences", ui->editor_highlight_all_occurrences->isChecked ());
  settings->setValue ("editor/codeCompletion", ui->editor_codeCompletion->isChecked ());
  settings->setValue ("editor/codeCompletion_threshold", ui->editor_spinbox_ac_threshold->value ());
  settings->setValue ("editor/codeCompletion_keywords", ui->editor_checkbox_ac_keywords->isChecked ());
  settings->setValue ("editor/codeCompletion_octave_builtins", ui->editor_checkbox_ac_builtins->isChecked ());
  settings->setValue ("editor/codeCompletion_octave_functions", ui->editor_checkbox_ac_functions->isChecked ());
  settings->setValue ("editor/codeCompletion_document", ui->editor_checkbox_ac_document->isChecked ());
  settings->setValue ("editor/codeCompletion_case", ui->editor_checkbox_ac_case->isChecked ());
  settings->setValue ("editor/codeCompletion_replace", ui->editor_checkbox_ac_replace->isChecked ());
  settings->setValue ("editor/auto_endif", ui->editor_auto_endif->currentIndex ());
  settings->setValue ("editor/show_white_space", ui->editor_ws_checkbox->isChecked ());
  settings->setValue ("editor/show_white_space_indent", ui->editor_ws_indent_checkbox->isChecked ());
  settings->setValue ("editor/show_eol_chars", ui->cb_show_eol->isChecked ());
  settings->setValue ("editor/show_hscroll_bar", ui->cb_show_hscrollbar->isChecked ());
  settings->setValue ("editor/default_eol_mode", ui->combo_eol_mode->currentIndex ());
  settings->setValue ("editor/octave_comment_string", ui->combo_oct_comment_str->currentIndex ());
  settings->setValue ("editor/default_encoding", ui->editor_combo_encoding->currentText ());
  settings->setValue ("editor/auto_indent", ui->editor_auto_ind_checkbox->isChecked ());
  settings->setValue ("editor/tab_indents_line", ui->editor_tab_ind_checkbox->isChecked ());
  settings->setValue ("editor/backspace_unindents_line", ui->editor_bs_unind_checkbox->isChecked ());
  settings->setValue ("editor/show_indent_guides", ui->editor_ind_guides_checkbox->isChecked ());
  settings->setValue ("editor/indent_width", ui->editor_ind_width_spinbox->value ());
  settings->setValue ("editor/indent_uses_tabs", ui->editor_ind_uses_tabs_checkbox->isChecked ());
  settings->setValue ("editor/tab_width", ui->editor_tab_width_spinbox->value ());
  settings->setValue ("editor/longWindowTitle", ui->editor_longWindowTitle->isChecked ());
  settings->setValue ("editor/notebook_tab_width_min", ui->editor_notebook_tab_width_min->value ());
  settings->setValue ("editor/notebook_tab_width_max", ui->editor_notebook_tab_width_max->value ());
  settings->setValue ("editor/restoreSession", ui->editor_restoreSession->isChecked ());
  settings->setValue ("editor/create_new_file", ui->editor_create_new_file->isChecked ());
  settings->setValue ("editor/hiding_closes_files", ui->editor_hiding_closes_files->isChecked ());
  settings->setValue ("editor/always_reload_changed_files", ui->editor_reload_changed_files->isChecked ());
  settings->setValue ("terminal/fontSize", ui->terminal_fontSize->value ());
  settings->setValue ("terminal/fontName", ui->terminal_fontName->currentFont ().family ());

  // file browser
  settings->setValue ("filesdockwidget/sync_octave_directory", ui->sync_octave_directory->isChecked ());
  settings->setValue ("filesdockwidget/restore_last_dir", ui->cb_restore_file_browser_dir->isChecked ());
  settings->setValue ("filesdockwidget/startup_dir", ui->le_file_browser_dir->text ());
  settings->setValue ("filesdockwidget/txt_file_extensions", ui->le_file_browser_extensions->text ());

  settings->setValue ("news/allow_web_connection", ui->checkbox_allow_web_connect->isChecked ());
  settings->setValue ("useProxyServer", ui->useProxyServer->isChecked ());
  settings->setValue ("proxyType", ui->proxyType->currentText ());
  settings->setValue ("proxyHostName", ui->proxyHostName->text ());
  settings->setValue ("proxyPort", ui->proxyPort->text ());
  settings->setValue ("proxyUserName", ui->proxyUserName->text ());
  settings->setValue ("proxyPassword", ui->proxyPassword->text ());
  settings->setValue ("terminal/cursorUseForegroundColor", ui->terminal_cursorUseForegroundColor->isChecked ());
  settings->setValue ("terminal/focus_after_command", ui->terminal_focus_command->isChecked ());
  settings->setValue ("terminal/print_debug_location", ui->terminal_print_dbg_location->isChecked ());
  settings->setValue ("terminal/history_buffer", ui->terminal_history_buffer->value ());

  // the cursor
  QString cursorType;
  switch (ui->terminal_cursorType->currentIndex ())
    {
    case 0: cursorType = "ibeam"; break;
    case 1: cursorType = "block"; break;
    case 2: cursorType = "underline";  break;
    }
  settings->setValue ("terminal/cursorType", cursorType);

#if defined (HAVE_QSCINTILLA)
  // editor styles: create lexer, get dialog contents, and write settings
  QsciLexer *lexer;

#if defined (HAVE_LEXER_OCTAVE)

  lexer = new QsciLexerOctave ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

#elif defined (HAVE_LEXER_MATLAB)

  lexer = new QsciLexerMatlab ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

#endif

  lexer = new QsciLexerCPP ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerPerl ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerBatch ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerDiff ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new QsciLexerBash ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

  lexer = new octave_txt_lexer ();
  write_lexer_settings (ui, lexer, settings);
  delete lexer;

#endif

  // Workspace
  write_workspace_colors (settings);
  // hide tool tips
  settings->setValue ("workspaceview/hide_tool_tips", ui->cb_hide_tool_tips->isChecked ());

  // Terminal
  write_terminal_colors (settings);

  // Variable editor
  settings->setValue ("variable_editor/autofit_column_width", ui->varedit_autoFitColumnWidth->isChecked ());
  settings->setValue ("variable_editor/autofit_type", ui->varedit_autofitType->currentIndex ());
  settings->setValue ("variable_editor/column_width", ui->varedit_columnWidth->text ());
  settings->setValue ("variable_editor/row_height", ui->varedit_rowHeight->text ());
  settings->setValue ("variable_editor/autofit_row_height", ui->varedit_rowAutofit->isChecked ());
  settings->setValue ("variable_editor/use_terminal_font", ui->varedit_useTerminalFont->isChecked ());
  settings->setValue ("variable_editor/alternate_rows", ui->varedit_alternate->isChecked ());
  settings->setValue ("variable_editor/font_name", ui->varedit_font->currentFont ().family ());
  settings->setValue ("variable_editor/font_size", ui->varedit_fontSize->value ());
  write_varedit_colors (settings);

  // shortcuts
  settings->setValue ("shortcuts/prevent_readline_conflicts", ui->cb_prevent_readline_conflicts->isChecked ());
  shortcut_manager::write_shortcuts (settings, closing);

  // settings dialog's geometry
  settings->setValue ("settings/last_tab", ui->tabWidget->currentIndex ());
  settings->setValue ("settings/geometry", saveGeometry ());

  settings->sync ();
}

void
settings_dialog::read_workspace_colors (QSettings *settings)
{

  QList<QColor> default_colors =
    resource_manager::storage_class_default_colors ();
  QStringList class_names = resource_manager::storage_class_names ();
  QString class_chars = resource_manager::storage_class_chars ();
  int nr_of_classes = class_chars.length ();

  QGridLayout *style_grid = new QGridLayout ();
  QVector<QLabel*> description (nr_of_classes);
  QVector<color_picker*> color (nr_of_classes);

  int column = 0;
  int row = 0;
  for (int i = 0; i < nr_of_classes; i++)
    {
      description[i] = new QLabel ("    " + class_names.at (i));
      description[i]->setAlignment (Qt::AlignRight);
      QVariant default_var = default_colors.at (i);
      QColor setting_color = settings->value ("workspaceview/color_" + class_chars.mid (i, 1), default_var).value<QColor> ();
      color[i] = new color_picker (setting_color);
      color[i]->setObjectName ("color_" + class_chars.mid (i, 1));
      color[i]->setMinimumSize (30, 10);
      style_grid->addWidget (description[i], row, 3*column);
      style_grid->addWidget (color[i], row, 3*column+1);
      if (++column == 3)
        {
          style_grid->setColumnStretch (4*column, 10);
          row++;
          column = 0;
        }
    }

  // place grid with elements into the tab
  ui->workspace_colors_box->setLayout (style_grid);
}

void
settings_dialog::write_workspace_colors (QSettings *settings)
{

  QString class_chars = resource_manager::storage_class_chars ();
  color_picker *color;

  for (int i = 0; i < class_chars.length (); i++)
    {
      color = ui->workspace_colors_box->findChild <color_picker *> ("color_" + class_chars.mid (i, 1));
      if (color)
        settings->setValue ("workspaceview/color_" + class_chars.mid (i, 1), color->color ());
    }
  settings->sync ();
}

void
settings_dialog::read_terminal_colors (QSettings *settings)
{

  QList<QColor> default_colors = resource_manager::terminal_default_colors ();
  QStringList class_names = resource_manager::terminal_color_names ();
  QString class_chars = resource_manager::terminal_color_chars ();
  int nr_of_classes = class_chars.length ();

  QGridLayout *style_grid = new QGridLayout ();
  QVector<QLabel*> description (nr_of_classes);
  QVector<color_picker*> color (nr_of_classes);

  int column = 0;
  int row = 0;
  for (int i = 0; i < nr_of_classes; i++)
    {
      description[i] = new QLabel ("    " + class_names.at (i));
      description[i]->setAlignment (Qt::AlignRight);
      QVariant default_var = default_colors.at (i);
      QColor setting_color = settings->value ("terminal/color_" + class_chars.mid (i, 1), default_var).value<QColor> ();
      color[i] = new color_picker (setting_color);
      color[i]->setObjectName ("terminal_color_" + class_chars.mid (i, 1));
      color[i]->setMinimumSize (30, 10);
      style_grid->addWidget (description[i], row, 2*column);
      style_grid->addWidget (color[i], row, 2*column+1);
      if (++column == 2)
        {
          style_grid->setColumnStretch (3*column, 10);
          row++;
          column = 0;
        }
    }

  // place grid with elements into the tab
  ui->terminal_colors_box->setLayout (style_grid);
}

void
settings_dialog::write_terminal_colors (QSettings *settings)
{
  QString class_chars = resource_manager::terminal_color_chars ();
  color_picker *color;

  for (int i = 0; i < class_chars.length (); i++)
    {
      color = ui->terminal_colors_box->findChild <color_picker *> ("terminal_color_" + class_chars.mid (i, 1));
      if (color)
        settings->setValue ("terminal/color_" + class_chars.mid (i, 1), color->color ());
    }

  settings->sync ();
}

void
settings_dialog::read_varedit_colors (QSettings *settings)
{
  QList<QColor> default_colors = variable_editor::default_colors ();
  QStringList class_names = variable_editor::color_names ();
  QString class_chars = resource_manager::varedit_color_chars ();
  int nr_of_classes = class_chars.length ();

  QGridLayout *style_grid = new QGridLayout ();
  QVector<QLabel*> description (nr_of_classes);
  QVector<color_picker*> color (nr_of_classes);

  int column = 0;
  int row = 0;
  for (int i = 0; i < nr_of_classes; i++)
    {
      description[i] = new QLabel ("    " + class_names.at (i));
      description[i]->setAlignment (Qt::AlignRight);
      QVariant default_var = default_colors.at (i);
      QColor setting_color = settings->value ("variable_editor/color_" + class_chars.mid (i, 1), default_var).value<QColor> ();
      color[i] = new color_picker (setting_color);
      color[i]->setObjectName ("varedit_color_" + class_chars.mid (i, 1));
      color[i]->setMinimumSize (30, 10);
      style_grid->addWidget (description[i], row, 2*column);
      style_grid->addWidget (color[i], row, 2*column+1);
      if (++column == 2)
        {
          style_grid->setColumnStretch (3*column, 10);
          row++;
          column = 0;
        }
    }

  // place grid with elements into the tab
  ui->varedit_colors_box->setLayout (style_grid);
}

void
settings_dialog::write_varedit_colors (QSettings *settings)
{
  QString class_chars = resource_manager::varedit_color_chars ();
  color_picker *color;

  for (int i = 0; i < class_chars.length (); i++)
    {
      color = ui->varedit_colors_box->findChild <color_picker *> ("varedit_color_" + class_chars.mid (i, 1));
      if (color)
        settings->setValue ("variable_editor/color_" + class_chars.mid (i, 1), color->color ());
    }

  settings->sync ();
}