/*

Copyright (C) 2013-2017 John W. Eaton
Copyright (C) 2011-2016 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/>.

*/

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

#include <QInputDialog>
#include <QApplication>
#include <QClipboard>
#include <QMessageBox>
#include <QLineEdit>
#include <QHeaderView>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
#include <QMenu>
#include <QLabel>
#include <QCompleter>
#include <QSignalMapper>

#include "workspace-view.h"
#include "resource-manager.h"

#include "interpreter-private.h"
#include "symtab.h"

workspace_view::workspace_view (QWidget *p)
  : octave_dock_widget (p), m_view (new QTableView (this))
{
  setObjectName ("WorkspaceView");
  setWindowIcon (QIcon (":/actions/icons/logo.png"));
  set_title (tr ("Workspace"));
  setStatusTip (tr ("View the variables in the active workspace."));

  m_filter = new QComboBox (this);
  m_filter->setToolTip (tr ("Enter text to filter the workspace"));
  m_filter->setEditable (true);
  m_filter->setMaxCount (MaxFilterHistory);
  m_filter->setInsertPolicy (QComboBox::NoInsert);
  m_filter->setSizeAdjustPolicy (QComboBox::AdjustToMinimumContentsLengthWithIcon);
  QSizePolicy sizePol (QSizePolicy::Expanding, QSizePolicy::Preferred);
  m_filter->setSizePolicy (sizePol);
  m_filter->completer ()->setCaseSensitivity (Qt::CaseSensitive);

  QLabel *filter_label = new QLabel (tr ("Filter"));

  m_filter_checkbox = new QCheckBox ();

  m_view->setWordWrap (false);
  m_view->setContextMenuPolicy (Qt::CustomContextMenu);
  m_view->setShowGrid (false);
  (m_view->verticalHeader) ()->hide ();
  m_view->setAlternatingRowColors (true);
  m_view_previous_row_count = 0;

  // Set an empty widget, so we can assign a layout to it.
  setWidget (new QWidget (this));

  // Create the layouts
  m_filter_widget = new QWidget (this);
  QHBoxLayout *filter_layout = new QHBoxLayout ();

  filter_layout->addWidget (filter_label);
  filter_layout->addWidget (m_filter_checkbox);
  filter_layout->addWidget (m_filter);
  filter_layout->setMargin(0);
  m_filter_widget->setLayout (filter_layout);

  QVBoxLayout *ws_layout = new QVBoxLayout ();
  ws_layout->addWidget (m_filter_widget);
  ws_layout->addWidget (m_view);

  QSettings *settings = resource_manager::get_settings ();

  if (settings)
    {
      m_filter_shown = settings->value ("workspaceview/filter_shown",true).toBool ();
      m_filter_widget->setVisible (m_filter_shown);

      ws_layout->setMargin (2);

      // Set the empty widget to have our layout.
      widget ()->setLayout (ws_layout);

      // Initialize collapse/expand state of the workspace subcategories.

      //enable sorting (setting column and order after model was set)
      m_view->setSortingEnabled (true);
      // Initialize column order and width of the workspace
      m_view->horizontalHeader ()->restoreState (settings->value ("workspaceview/column_state").toByteArray ());

      // Set header properties for sorting
#if defined (HAVE_QT4)
      m_view->horizontalHeader ()->setClickable (true);
      m_view->horizontalHeader ()->setMovable (true);
#else
      m_view->horizontalHeader ()->setSectionsClickable (true);
      m_view->horizontalHeader ()->setSectionsMovable (true);
#endif
      m_view->horizontalHeader ()->setSortIndicator (settings->value ("workspaceview/sort_by_column",0).toInt (),
                                                   static_cast<Qt::SortOrder>
                                                   (settings->value ("workspaceview/sort_order", Qt::AscendingOrder).toUInt ()));
      m_view->horizontalHeader ()->setSortIndicatorShown (true);

      m_view->horizontalHeader ()->setContextMenuPolicy (Qt::CustomContextMenu);
      connect (m_view->horizontalHeader (),
               SIGNAL (customContextMenuRequested (const QPoint &)),
               this, SLOT (header_contextmenu_requested (const QPoint &)));

      // Init state of the filter
      m_filter->addItems (settings->value ("workspaceview/mru_list").toStringList ());

      bool filter_state =
        settings->value ("workspaceview/filter_active", false).toBool ();
      m_filter_checkbox->setChecked (filter_state);
      filter_activate (filter_state);
    }

  // Connect signals and slots.

  connect (m_filter, SIGNAL (editTextChanged (const QString&)),
           this, SLOT (filter_update (const QString&)));
  connect (m_filter_checkbox, SIGNAL (toggled (bool)),
           this, SLOT (filter_activate (bool)));
  connect (m_filter->lineEdit (), SIGNAL (editingFinished ()),
           this, SLOT (update_filter_history ()));

  connect (m_view, SIGNAL (customContextMenuRequested (const QPoint&)),
           this, SLOT (contextmenu_requested (const QPoint&)));

  connect (m_view, SIGNAL (doubleClicked (QModelIndex)),
           this, SLOT (handle_contextmenu_edit (void)));

  connect (this, SIGNAL (command_requested (const QString&)),
           p, SLOT (execute_command_in_terminal (const QString&)));

  connect (this, SIGNAL (edit_variable_signal (const QString&)),
           p, SLOT (edit_variable (const QString&)));
}

void workspace_view::setModel (workspace_model *model)
{
  m_filter_model.setSourceModel (model);
  m_filter_model.setFilterKeyColumn(0);

  m_view->setModel (&m_filter_model);

  // set the sorting after a model was set, it would be ignored otherwise
  QSettings *settings = resource_manager::get_settings ();
  m_view->sortByColumn (settings->value ("workspaceview/sort_by_column",0).toInt (),
                        static_cast<Qt::SortOrder> (settings->value ("workspaceview/sort_order", Qt::AscendingOrder).toUInt ()));

  m_model = model;
}

void
workspace_view::notice_settings (const QSettings *settings)
{
  int i;

  m_model->notice_settings (settings); // update colors of model first

  for (i = 0; i < m_columns_shown_keys.size (); i++)
    m_view->setColumnHidden (i + 1, ! settings->value (m_columns_shown_keys.at (i),true).toBool ());

  QString tool_tip;

  if (! settings->value ("workspaceview/hide_tool_tips",false).toBool ())
    {
      tool_tip  = QString (tr ("View the variables in the active workspace.<br>"));
      tool_tip += QString (tr ("Colors for variable attributes:"));
      for (i = 0; i < resource_manager::storage_class_chars ().length (); i++)
        {
          tool_tip +=
            QString (R"(<div style="background-color:%1;color:#000000">%2</div>)")
            .arg (m_model->storage_class_color (i).name ())
            .arg (resource_manager::storage_class_names ().at (i));
        }
    }

  setToolTip (tool_tip);

  m_columns_shown = QStringList ();
  m_columns_shown.append (tr ("Class"));
  m_columns_shown.append (tr ("Dimension"));
  m_columns_shown.append (tr ("Value"));
  m_columns_shown.append (tr ("Attribute"));

  m_columns_shown_keys = QStringList ();
  m_columns_shown_keys.append ("workspaceview/show_class");
  m_columns_shown_keys.append ("workspaceview/show_dimension");
  m_columns_shown_keys.append ("workspaceview/show_value");
  m_columns_shown_keys.append ("workspaceview/show_attribute");

  m_sig_mapper = nullptr;
}

void
workspace_view::save_settings (void)
{
  QSettings *settings = resource_manager::get_settings ();

  if (! settings)
    return;

  settings->setValue ("workspaceview/column_state",
                      m_view->horizontalHeader ()->saveState ());

  int sort_column = m_view->horizontalHeader ()->sortIndicatorSection ();
  Qt::SortOrder sort_order = m_view->horizontalHeader ()->sortIndicatorOrder ();
  settings->setValue ("workspaceview/sort_by_column", sort_column);
  settings->setValue ("workspaceview/sort_order", sort_order);

  settings->setValue ("workspaceview/filter_active",
                      m_filter_checkbox->isChecked ());
  settings->setValue ("workspaceview/filter_shown", m_filter_shown);

  QStringList mru;
  for (int i = 0; i < m_filter->count (); i++)
    mru.append (m_filter->itemText (i));
  settings->setValue ("workspaceview/mru_list", mru);

  settings->sync ();

  octave_dock_widget::save_settings ();

  if (m_sig_mapper)
    delete m_sig_mapper;
}

void
workspace_view::closeEvent (QCloseEvent *e)
{
  emit active_changed (false);
  QDockWidget::closeEvent (e);
}

void
workspace_view::filter_update (const QString& expression)
{
  m_filter_model.setFilterWildcard (expression);
  handle_model_changed ();
}

void
workspace_view::filter_activate (bool state)
{
  m_filter->setEnabled (state);
  m_filter_model.setDynamicSortFilter (state);

  if (state)
    filter_update (m_filter->currentText ());
  else
    filter_update (QString ());
}

void
workspace_view::update_filter_history (void)
{
  QString text = m_filter->currentText ();   // get current text
  int index = m_filter->findText (text);     // and its actual index

  if (index > -1)
    m_filter->removeItem (index);    // remove if already existing

  m_filter->insertItem (0, text);    // (re)insert at beginning
  m_filter->setCurrentIndex (0);
}

void
workspace_view::header_contextmenu_requested (const QPoint& mpos)
{
  QMenu menu (this);

  if (m_sig_mapper)
    delete m_sig_mapper;
  m_sig_mapper = new QSignalMapper (this);

  QSettings *settings = resource_manager::get_settings ();

  for (int i = 0; i < m_columns_shown.size (); i++)
    {
      QAction *action = menu.addAction (m_columns_shown.at (i),
                                        m_sig_mapper, SLOT (map ()));
      m_sig_mapper->setMapping (action, i);
      action->setCheckable (true);
      action->setChecked (settings->value (m_columns_shown_keys.at (i),true).toBool ());
    }

  connect (m_sig_mapper, SIGNAL (mapped (int)), this, SLOT (toggle_header (int)));

  menu.exec (m_view->mapToGlobal (mpos));
}

void
workspace_view::toggle_header (int col)
{
  QSettings *settings = resource_manager::get_settings ();

  QString key = m_columns_shown_keys.at (col);
  bool shown = settings->value (key,true).toBool ();

  m_view->setColumnHidden (col + 1, shown);

  settings->setValue (key, ! shown);
  settings->sync ();

  octave_dock_widget::save_settings ();
}

void
workspace_view::contextmenu_requested (const QPoint& qpos)
{
  QMenu menu (this);

  QModelIndex index = m_view->indexAt (qpos);

  // if it isnt Local, Glocal etc, allow the ctx menu
  if (index.isValid () && index.column () == 0)
    {
      QString var_name = get_var_name (index);

      menu.addAction (tr ("Open in Variable Editor"), this,
                      SLOT (handle_contextmenu_edit ()));

      menu.addAction (tr ("Copy name"), this,
                      SLOT (handle_contextmenu_copy ()));

      menu.addAction (tr ("Copy value"), this,
                      SLOT (handle_contextmenu_copy_value ()));

      QAction *rename = menu.addAction (tr ("Rename"), this,
                                        SLOT (handle_contextmenu_rename ()));

      QAbstractItemModel *m = m_view->model ();
      const workspace_model *wm = static_cast<const workspace_model *> (m);

      if (! wm->is_top_level ())
        {
          rename->setDisabled (true);
          rename->setToolTip (tr ("Only top-level symbols may be renamed"));
        }

      menu.addSeparator ();

      menu.addAction ("disp (" + var_name + ')', this,
                      SLOT (handle_contextmenu_disp ()));

      menu.addAction ("plot (" + var_name + ')', this,
                      SLOT (handle_contextmenu_plot ()));

      menu.addAction ("stem (" + var_name + ')', this,
                      SLOT (handle_contextmenu_stem ()));

      menu.addSeparator ();

    }

  if (m_filter_shown)
    menu.addAction (tr ("Hide filter"), this,
                    SLOT (handle_contextmenu_filter ()));
  else
    menu.addAction (tr ("Show filter"), this,
                    SLOT (handle_contextmenu_filter ()));

  menu.exec (m_view->mapToGlobal (qpos));
}

void
workspace_view::handle_contextmenu_copy (void)
{
  QModelIndex index = m_view->currentIndex ();

  if (index.isValid ())
    {
      QString var_name = get_var_name (index);

      QClipboard *clipboard = QApplication::clipboard ();

      clipboard->setText (var_name);
    }
}

void
workspace_view::handle_contextmenu_copy_value (void)
{
  QModelIndex index = m_view->currentIndex ();

  if (index.isValid ())
    {
      QString var_name = get_var_name (index);

      octave::symbol_scope *scope
        = octave::__get_current_scope__ ("workspace_view::handle_contextmenu_copy_value");

      octave_value val = scope ? scope->varval (var_name.toStdString ()) : 0;
      std::ostringstream buf;
      val.print_raw (buf, true);

      QClipboard *clipboard = QApplication::clipboard ();
      clipboard->setText (QString::fromStdString (buf.str ()));
    }
}

void
workspace_view::handle_contextmenu_rename (void)
{
  QModelIndex index = m_view->currentIndex ();

  if (index.isValid ())
    {
      QString var_name = get_var_name (index);

      QInputDialog *inputDialog = new QInputDialog ();

      inputDialog->setOptions (QInputDialog::NoButtons);

      bool ok = false;

      QString new_name
        = inputDialog->getText (nullptr, "Rename Variable", "New name:",
                                QLineEdit::Normal, var_name, &ok);

      if (ok && ! new_name.isEmpty ())
        {
          QAbstractItemModel *m = m_view->model ();
          m->setData (index, new_name, Qt::EditRole);
        }
    }
}

void
workspace_view::handle_contextmenu_edit (void)
{
  QModelIndex index = m_view->currentIndex ();

  if (index.isValid ())
    {
      index = index.sibling (index.row (), 0);

      QAbstractItemModel *m = m_view->model ();

      QMap<int, QVariant> item_data = m->itemData (index);

      QString var_name = item_data[0].toString ();

      emit edit_variable_signal (var_name);
    }
}

void
workspace_view::handle_contextmenu_disp (void)
{
  relay_contextmenu_command ("disp");
}

void
workspace_view::handle_contextmenu_plot (void)
{
  relay_contextmenu_command ("figure (); plot");
}

void
workspace_view::handle_contextmenu_stem (void)
{
  relay_contextmenu_command ("figure (); stem");
}

void
workspace_view::handle_contextmenu_filter (void)
{
  m_filter_shown = ! m_filter_shown;
  m_filter_widget->setVisible (m_filter_shown);
}

void
workspace_view::handle_model_changed (void)
{
  // m_view->resizeRowsToContents ();
  // Just modify those rows that have been added rather than go through
  // the whole list.  For-loop test will handle when number of rows reduced.
  QFontMetrics fm = m_view->fontMetrics ();
  int row_height = fm.height ();
  int new_row_count = m_filter_model.rowCount ();
  for (int i = m_view_previous_row_count; i < new_row_count; i++)
    m_view->setRowHeight (i, row_height);
  m_view_previous_row_count = new_row_count;
}

void
workspace_view::copyClipboard ()
{
  if (m_view->hasFocus ())
    handle_contextmenu_copy ();
}

void
workspace_view::selectAll ()
{
  if (m_view->hasFocus ())
    m_view->selectAll ();
}

void
workspace_view::relay_contextmenu_command (const QString& cmdname)
{
  QModelIndex index = m_view->currentIndex ();

  if (index.isValid ())
    {
      QString var_name = get_var_name (index);

      emit command_requested (cmdname + " (" + var_name + ");");
    }
}

QString
workspace_view::get_var_name (QModelIndex index)
{
  index = index.sibling (index.row (), 0);
  QAbstractItemModel *m = m_view->model ();
  QMap<int, QVariant> item_data = m->itemData (index);

  return item_data[0].toString ();
}