/*

Copyright (C) 2011-2012 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/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <QApplication>
#include <QClipboard>
#include <QVBoxLayout>
#include <QMenu>

#include "error.h"

#include "cmd-hist.h"

#include "history-dockwidget.h"

history_dock_widget::history_dock_widget (QWidget *p)
  : octave_dock_widget (p)
{
  setObjectName ("HistoryDockWidget");
  setStatusTip (tr ("Browse and search the command history."));

  connect (this, SIGNAL (information (QString)),
           p, SLOT (report_status_message (QString)));

  connect (this, SIGNAL (command_double_clicked (const QString&)),
           p, SLOT (handle_command_double_clicked (const QString&)));

  construct ();
}

void
history_dock_widget::connect_visibility_changed (void)
{
  connect (this, SIGNAL (visibilityChanged (bool)),
           this, SLOT (handle_visibility (bool)));
}

void
history_dock_widget::construct ()
{
  _history_model = new QStringListModel ();
  _sort_filter_proxy_model.setSourceModel (_history_model);
  _history_list_view = new QListView (this);
  _history_list_view->setModel (&_sort_filter_proxy_model);
  _history_list_view->setAlternatingRowColors (true);
  _history_list_view->setEditTriggers (QAbstractItemView::NoEditTriggers);
  _history_list_view->setStatusTip (tr ("Doubleclick a command to transfer it to the terminal."));
  _history_list_view->setSelectionMode (QAbstractItemView::ExtendedSelection);
  _history_list_view->setContextMenuPolicy(Qt::CustomContextMenu);
  connect(_history_list_view, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(ctxMenu(const QPoint &)));

  _filter_line_edit = new QLineEdit (this);
  _filter_line_edit->setStatusTip (tr ("Enter text to filter the command history."));
  QVBoxLayout *vbox_layout = new QVBoxLayout ();

  setWindowIcon (QIcon(":/actions/icons/logo.png"));
  setWindowTitle (tr ("Command History"));
  setWidget (new QWidget ());

  vbox_layout->addWidget (_history_list_view);
  vbox_layout->addWidget (_filter_line_edit);
  vbox_layout->setMargin (2);

  widget ()->setLayout (vbox_layout);

  connect (_filter_line_edit, SIGNAL (textEdited (QString)),
           &_sort_filter_proxy_model, SLOT (setFilterWildcard (QString)));

  connect (_history_list_view, SIGNAL (doubleClicked (QModelIndex)),
           this, SLOT (handle_double_click (QModelIndex)));

  setFocusProxy (_filter_line_edit);
}

void history_dock_widget::ctxMenu(const QPoint &xpos) {
    QMenu menu(this);
    menu.addAction(tr("Copy"), this, SLOT(handle_contextmenu_copy(bool)));
    menu.addAction(tr("Evaluate"), this, SLOT(handle_contextmenu_evaluate(bool)));
    menu.exec(_history_list_view->mapToGlobal(xpos));
}

void history_dock_widget::handle_contextmenu_copy(bool)
{
  QString text;
  QItemSelectionModel *selectionModel = _history_list_view->selectionModel();
  QModelIndexList rows = selectionModel->selectedRows();
  QModelIndexList::iterator it;
  for (it=rows.begin() ; it != rows.end(); it++) {
    if ((*it).isValid()) {
      text += (*it).data().toString()+"\n";
    }
  }
  QApplication::clipboard()->setText(text);
}

void history_dock_widget::handle_contextmenu_evaluate(bool)
{
  QItemSelectionModel *selectionModel = _history_list_view->selectionModel();
  QModelIndexList rows = selectionModel->selectedRows();
  QModelIndexList::iterator it;
  for (it=rows.begin() ; it != rows.end(); it++) {
    if ((*it).isValid()) {
      emit command_double_clicked ((*it).data().toString()+"\n");
    }
  }
}

void
history_dock_widget::handle_double_click (QModelIndex modelIndex)
{
  emit command_double_clicked (modelIndex.data().toString()+"\n");
}

void
history_dock_widget::set_history (const QStringList& hist)
{
  _history_model->setStringList (hist);
  _history_list_view->scrollToBottom ();
}

void
history_dock_widget::append_history (const QString& hist_entry)
{
  QStringList lst = _history_model->stringList ();
  lst.append (hist_entry);
  _history_model->setStringList (lst);
  _history_list_view->scrollToBottom ();
}

void
history_dock_widget::clear_history (void)
{
  _history_model->setStringList (QStringList ());
}

void
history_dock_widget::focus (void)
{
  if (! isVisible ())
    setVisible (true);

  setFocus ();
  activateWindow ();
  raise ();
}

void
history_dock_widget::handle_visibility (bool visible)
{
  if (visible && ! isFloating ())
    focus ();
}