/*

Copyright (C) 2011-2019 Michael Goffioul

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
<https://www.gnu.org/licenses/>.

*/

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

#include <QLineEdit>

#include "Container.h"
#include "EditControl.h"
#include "TextEdit.h"
#include "QtHandlesUtils.h"

namespace QtHandles
{

  EditControl*
  EditControl::create (const graphics_object& go)
  {
    Object *parent = Object::parentObject (go);

    if (parent)
      {
        Container *container = parent->innerContainer ();

        if (container)
          {
            uicontrol::properties& up = Utils::properties<uicontrol> (go);

            if ((up.get_max () - up.get_min ()) > 1)
              return new EditControl (go, new TextEdit (container));
            else
              return new EditControl (go, new QLineEdit (container));
          }
      }

    return nullptr;
  }

  EditControl::EditControl (const graphics_object& go, QLineEdit *edit)
    : BaseControl (go, edit), m_multiLine (false), m_textChanged (false)
  {
    init (edit);
  }

  void
  EditControl::init (QLineEdit *edit, bool callBase)
  {
    if (callBase)
      BaseControl::init (edit, callBase);

    m_multiLine = false;
    initCommon (edit);

    uicontrol::properties& up = properties<uicontrol> ();

    edit->setText (Utils::fromStdString (up.get_string_string ()));
    edit->setAlignment (Utils::fromHVAlign (up.get_horizontalalignment (),
                                            up.get_verticalalignment ()));

    connect (edit, SIGNAL (textEdited (const QString&)),
             SLOT (textChanged (void)));
    connect (edit, SIGNAL (editingFinished (void)),
             SLOT (editingFinished (void)));
    connect (edit, SIGNAL (returnPressed (void)),
             SLOT (returnPressed (void)));
  }

  EditControl::EditControl (const graphics_object& go, TextEdit *edit)
    : BaseControl (go, edit), m_multiLine (true), m_textChanged (false)
  {
    init (edit);
  }

  void
  EditControl::init (TextEdit *edit, bool callBase)
  {
    if (callBase)
      BaseControl::init (edit, callBase);

    m_multiLine = true;
    initCommon (edit);

    uicontrol::properties& up = properties<uicontrol> ();

    edit->setAcceptRichText (false);
    edit->setPlainText (Utils::fromStringVector (
                          up.get_string_vector ()).join ("\n"));

    connect (edit, SIGNAL (textChanged (void)),
             SLOT (textChanged (void)));
    connect (edit, SIGNAL (editingFinished (void)),
             SLOT (editingFinished (void)));
    connect (edit, SIGNAL (returnPressed (void)),
             SLOT (returnPressed (void)));
  }

  EditControl::~EditControl (void)
  { }

  void
  EditControl::initCommon (QWidget*)
  {
    m_textChanged = false;
  }

  void
  EditControl::update (int pId)
  {
    bool handled = false;

    if (m_multiLine)
      handled = updateMultiLine (pId);
    else
      handled = updateSingleLine (pId);

    if (! handled)
      {
        switch (pId)
          {
          default:
            BaseControl::update (pId);
            break;
          }
      }
  }

  bool
  EditControl::updateSingleLine (int pId)
  {
    uicontrol::properties& up = properties<uicontrol> ();
    QLineEdit *edit = qWidget<QLineEdit> ();

    switch (pId)
      {
      case uicontrol::properties::ID_STRING:
        edit->setText (Utils::fromStdString (up.get_string_string ()));
        return true;

      case uicontrol::properties::ID_HORIZONTALALIGNMENT:
      case uicontrol::properties::ID_VERTICALALIGNMENT:
        edit->setAlignment (Utils::fromHVAlign (up.get_horizontalalignment (),
                                                up.get_verticalalignment ()));
        return true;

      case uicontrol::properties::ID_MIN:
      case uicontrol::properties::ID_MAX:
        if ((up.get_max () - up.get_min ()) > 1)
          {
            QWidget *container = edit->parentWidget ();

            delete edit;
            init (new TextEdit (container), true);
          }
        return true;

      default:
        break;
      }

    return false;
  }

  bool
  EditControl::updateMultiLine (int pId)
  {
    uicontrol::properties& up = properties<uicontrol> ();
    TextEdit *edit = qWidget<TextEdit> ();

    switch (pId)
      {
      case uicontrol::properties::ID_STRING:
        edit->setPlainText (Utils::fromStringVector (
                              up.get_string_vector ()).join ("\n"));
        return true;

      case uicontrol::properties::ID_MIN:
      case uicontrol::properties::ID_MAX:
        if ((up.get_max () - up.get_min ()) <= 1)
          {
            QWidget *container = edit->parentWidget ();

            delete edit;
            init (new QLineEdit (container), true);
          }
        return true;

      default:
        break;
      }

    return false;
  }

  void
  EditControl::textChanged (void)
  {
    m_textChanged = true;
  }

  void
  EditControl::returnPressed (void)
  {
    QString txt = (m_multiLine
                   ? qWidget<TextEdit> ()->toPlainText ()
                   : qWidget<QLineEdit> ()->text ());

    if (m_textChanged)
      {
        if (m_multiLine)
          gh_manager::post_set (m_handle, "string",
                                Utils::toCellString (txt.split ("\n")), false);
        else
          gh_manager::post_set (m_handle, "string",
                                Utils::toStdString (txt), false);

        m_textChanged = false;
      }

    if (txt.length () > 0)
      gh_manager::post_callback (m_handle, "callback");
  }

  void
  EditControl::editingFinished (void)
  {
    if (m_textChanged)
      {
        QString txt = (m_multiLine
                       ? qWidget<TextEdit> ()->toPlainText ()
                       : qWidget<QLineEdit> ()->text ());
        if (m_multiLine)
          gh_manager::post_set (m_handle, "string",
                                Utils::toCellString (txt.split ("\n")), false);
        else
          gh_manager::post_set (m_handle, "string",
                                Utils::toStdString (txt), false);
        gh_manager::post_callback (m_handle, "callback");

        m_textChanged = false;
      }
  }

}
