/*

Copyright (C) 2011-2014 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
<http://www.gnu.org/licenses/>.

*/

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

#include <QAction>
#include <QActionEvent>
#include <QActionGroup>
#include <QApplication>
#include <QEvent>
#include <QFrame>
#include <QMainWindow>
#include <QMenu>
#include <QMenuBar>
#include <QMessageBox>
#include <QtDebug>
#include <QTimer>
#include <QToolBar>

#include "Canvas.h"
#include "Container.h"
#include "Figure.h"
#include "FigureWindow.h"
#include "MouseModeActionGroup.h"
#include "QtHandlesUtils.h"

namespace QtHandles
{

#define ABOUT_TEXT "<b>QtHandles</b> - a Qt-based toolkit for <a href=\"http://www.octave.org\">Octave</a>.<br><br>Copyright (C) 2011-2014 Michael Goffioul"

DECLARE_GENERICEVENTNOTIFY_SENDER(MenuBar, QMenuBar);

static bool hasUiControlChildren (const figure::properties& fp)
{
  Matrix kids = fp.get_all_children ();

  for (int i = 0; i < kids.numel (); i++)
    {
      graphics_object go (gh_manager::get_object (kids(i)));

      if (go && (go.isa ("uicontrol") || go.isa ("uipanel")
                 || go.isa ("uibuttongroup")))
        return true;
    }

  return false;
}

static bool hasUiMenuChildren (const figure::properties& fp)
{
  Matrix kids = fp.get_all_children ();

  for (int i = 0; i < kids.numel (); i++)
    {
      graphics_object go (gh_manager::get_object (kids(i)));

      if (go && go.isa ("uimenu"))
        return true;
    }

  return false;
}

static QRect boundingBoxToRect (const Matrix& bb)
{
  QRect r;

  if (bb.numel () == 4)
    {
      r = QRect (xround (bb(0)), xround (bb(1)),
                 xround (bb(2)), xround (bb(3)));
      if (! r.isValid ())
        r = QRect ();
    }

  return r;
}

Figure* Figure::create (const graphics_object& go)
{
  return new Figure (go, new FigureWindow ());
}

Figure::Figure (const graphics_object& go, FigureWindow* win)
     : Object (go, win), m_blockUpdates (false), m_mouseMode (NoMode),
       m_lastMouseMode (NoMode), m_figureToolBar (0), m_menuBar (0),
       m_innerRect (), m_outerRect ()
{
  m_container = new Container (win);
  win->setCentralWidget (m_container);

  figure::properties& fp = properties<figure> ();

  createFigureToolBarAndMenuBar ();

  int offset = 0;
  if (fp.toolbar_is ("figure")
      || (fp.toolbar_is ("auto") && ! hasUiControlChildren (fp)))
    offset += m_figureToolBar->sizeHint ().height ();
  else
    m_figureToolBar->hide ();
  if (fp.menubar_is ("figure") || hasUiMenuChildren (fp))
    offset += m_menuBar->sizeHint ().height () + 1;
  else
    m_menuBar->hide ();

  m_innerRect = boundingBoxToRect (fp.get_boundingbox (true));
  m_outerRect = boundingBoxToRect (fp.get_boundingbox (false));

  //qDebug () << "Figure::Figure:" << m_innerRect;
  win->setGeometry (m_innerRect.adjusted (0, -offset, 0, 0));
  //qDebug () << "Figure::Figure(adjusted)" << m_innerRect.adjusted (0, -offset, 0, 0);
  win->setWindowTitle (Utils::fromStdString (fp.get_title ()));

  int eventMask = 0;
  if (! fp.get_keypressfcn ().is_empty ())
    eventMask |= Canvas::KeyPress;
  if (! fp.get_keyreleasefcn ().is_empty ())
    eventMask |= Canvas::KeyRelease;
  m_container->canvas (m_handle)->setEventMask (eventMask);

  if (! fp.get_windowbuttonmotionfcn ().is_empty ())
    {
      m_container->setMouseTracking (true);
      m_container->canvas (m_handle)->qWidget ()->setMouseTracking (true);
    }

  connect (this, SIGNAL (asyncUpdate (void)),
           this, SLOT (updateContainer (void)));

  if (fp.is_visible ())
    QTimer::singleShot (0, win, SLOT (show ()));
  else
    win->hide ();

  win->addReceiver (this);
  m_container->addReceiver (this);
}

Figure::~Figure (void)
{
}

void Figure::createFigureToolBarAndMenuBar (void)
{
  QMainWindow* win = qWidget<QMainWindow> ();

  m_figureToolBar = win->addToolBar (tr ("Figure ToolBar"));
  m_figureToolBar->setMovable (false);
  m_figureToolBar->setFloatable (false);

  MouseModeActionGroup* mouseModeGroup = new MouseModeActionGroup (win);
  connect (mouseModeGroup, SIGNAL (modeChanged (MouseMode)),
           SLOT (setMouseMode (MouseMode)));
  m_figureToolBar->addActions (mouseModeGroup->actions ());

  m_menuBar = new MenuBar (win);
  win->setMenuBar (m_menuBar);

  QMenu* fileMenu = m_menuBar->addMenu (tr ("&File"));
  fileMenu->menuAction ()->setObjectName ("builtinMenu");
  fileMenu->addAction (tr ("&New Figure"), this, SLOT (fileNewFigure (void)));
  fileMenu->addAction (tr ("&Open..."))->setEnabled (false);
  fileMenu->addSeparator ();
  fileMenu->addAction (tr ("&Save"))->setEnabled (false);
  fileMenu->addAction (tr ("Save &As"))->setEnabled (false);
  fileMenu->addSeparator ();
  fileMenu->addAction (tr ("&Close Figure"), this,
                       SLOT (fileCloseFigure (void)), Qt::CTRL|Qt::Key_W);

  QMenu* editMenu = m_menuBar->addMenu (tr ("&Edit"));
  editMenu->menuAction ()->setObjectName ("builtinMenu");
  editMenu->addAction (tr ("Cop&y"), this, SLOT (editCopy (void)),
                       Qt::CTRL|Qt::Key_C)->setEnabled (false);
  editMenu->addAction (tr ("Cu&t"), this, SLOT (editCut (void)),
                       Qt::CTRL|Qt::Key_X)->setEnabled (false);
  editMenu->addAction (tr ("&Paste"), this, SLOT (editPaste(void)),
                       Qt::CTRL|Qt::Key_V)->setEnabled (false);
  editMenu->addSeparator ();
  editMenu->addActions (mouseModeGroup->actions ());

  QMenu* helpMenu = m_menuBar->addMenu (tr ("&Help"));
  helpMenu->menuAction ()->setObjectName ("builtinMenu");
  helpMenu->addAction (tr ("&About QtHandles"), this,
                       SLOT (helpAboutQtHandles (void)));
  helpMenu->addAction (tr ("About &Qt"), qApp, SLOT (aboutQt (void)));

  m_menuBar->addReceiver (this);
}

Container* Figure::innerContainer (void)
{
  return m_container;
}

void Figure::redraw (void)
{
  Canvas* canvas = m_container->canvas (m_handle);

  if (canvas)
    {
    canvas->redraw ();
    //canvas->setMouseMode (RotateMode);
    }

  foreach (QFrame* frame,
           qWidget<QWidget> ()->findChildren<QFrame*> ("UIPanel"))
    {
      Object* obj = Object::fromQObject (frame);

      if (obj)
        obj->slotRedraw ();
    }
}

void Figure::beingDeleted (void)
{
  Canvas* canvas = m_container->canvas (m_handle.value (), false);

  if (canvas)
    canvas->blockRedraw (true);

  m_menuBar->removeReceiver (this);
  m_container->removeReceiver (this);
  qWidget<FigureWindow> ()->removeReceiver (this);
}

void Figure::update (int pId)
{
  if (m_blockUpdates)
    return;

  figure::properties& fp = properties<figure> ();
  QMainWindow* win = qWidget<QMainWindow> ();

  m_blockUpdates = true;

  switch (pId)
    {
    case figure::properties::ID_POSITION:
        {
          m_innerRect = boundingBoxToRect (fp.get_boundingbox (true));
          //qDebug () << "Figure::update(position):" << m_innerRect;
          int offset = 0;

          foreach (QToolBar* tb, win->findChildren<QToolBar*> ())
            if (! tb->isHidden ())
              offset += tb->sizeHint ().height ();
          if (! m_menuBar->isHidden ())
            offset += m_menuBar->sizeHint ().height () + 1;
          //qDebug () << "Figure::update(position)(adjusted):" << m_innerRect.adjusted (0, -offset, 0, 0);
          win->setGeometry (m_innerRect.adjusted (0, -offset, 0, 0));
          //qDebug () << "Figure::update(position): done";
        }
      break;
    case figure::properties::ID_NAME:
    case figure::properties::ID_NUMBERTITLE:
      win->setWindowTitle (Utils::fromStdString (fp.get_title ()));
      break;
    case figure::properties::ID_VISIBLE:
      if (fp.is_visible ())
        QTimer::singleShot (0, win, SLOT (show ()));
      else
        win->hide ();
      break;
    case figure::properties::ID_TOOLBAR:
      if (fp.toolbar_is ("none"))
        showFigureToolBar (false);
      else if (fp.toolbar_is ("figure"))
        showFigureToolBar (true);
      else // "auto"
        showFigureToolBar (! hasUiControlChildren (fp));
      break;
    case figure::properties::ID_MENUBAR:
      showMenuBar (fp.menubar_is ("figure"));
      break;
    case figure::properties::ID_KEYPRESSFCN:
      if (fp.get_keypressfcn ().is_empty ())
        m_container->canvas (m_handle)->clearEventMask (Canvas::KeyPress);
      else
        m_container->canvas (m_handle)->addEventMask (Canvas::KeyPress);
      break;
    case figure::properties::ID_KEYRELEASEFCN:
      if (fp.get_keyreleasefcn ().is_empty ())
        m_container->canvas (m_handle)->clearEventMask (Canvas::KeyRelease);
      else
        m_container->canvas (m_handle)->addEventMask (Canvas::KeyRelease);
      break;
    case figure::properties::ID_WINDOWBUTTONMOTIONFCN:
        {
          bool hasCallback = ! fp.get_windowbuttonmotionfcn ().is_empty ();

          m_container->setMouseTracking (hasCallback);
          foreach (QWidget* w, m_container->findChildren<QWidget*> ())
            { w->setMouseTracking (hasCallback); }
        }
      break;
    default:
      break;
    }

  m_blockUpdates = false;
}

void Figure::showFigureToolBar (bool visible)
{
  if ((! m_figureToolBar->isHidden ()) != visible)
    {
      int dy = m_figureToolBar->sizeHint ().height ();
      QRect r = qWidget<QWidget> ()->geometry ();

      if (! visible)
        r.adjust (0, dy, 0, 0);
      else
        r.adjust (0, -dy, 0, 0);

      m_blockUpdates = true;
      qWidget<QWidget> ()->setGeometry (r);
      m_figureToolBar->setVisible (visible);
      m_blockUpdates = false;

      updateBoundingBox (false);

      if (visible)
        m_mouseMode = m_lastMouseMode;
      else
        {
          m_lastMouseMode = m_mouseMode;
          m_mouseMode = NoMode;
        }
    }
}

void Figure::showMenuBar (bool visible)
{
  int h1 = m_menuBar->sizeHint ().height ();

  foreach (QAction* a, m_menuBar->actions ())
    if (a->objectName () == "builtinMenu")
      a->setVisible (visible);

  int h2 = m_menuBar->sizeHint ().height ();

  if (! visible)
    visible = hasUiMenuChildren (properties<figure> ());

  if ((! m_menuBar->isHidden ()) != visible)
    {
      int dy = qMax (h1, h2) + 1;
      QRect r = qWidget<QWidget> ()->geometry ();

      //qDebug () << "Figure::showMenuBar:" << r;
      if (! visible)
        r.adjust (0, dy, 0, 0);
      else
        r.adjust (0, -dy, 0, 0);
      //qDebug () << "Figure::showMenuBar(adjusted):" << r;

      m_blockUpdates = true;
      qWidget<QWidget> ()->setGeometry (r);
      m_menuBar->setVisible (visible);
      m_blockUpdates = false;

      updateBoundingBox (false);
    }
}

void Figure::updateMenuBar (void)
{
  gh_manager::auto_lock lock;
  graphics_object go = object ();

  if (go.valid_object ())
    showMenuBar (Utils::properties<figure> (go).menubar_is ("figure"));
}

QWidget* Figure::menu (void)
{
  return qWidget<QMainWindow> ()->menuBar ();
}

struct UpdateBoundingBoxData
{
  Matrix m_bbox;
  bool m_internal;
  graphics_handle m_handle;
  Figure* m_figure;
};

void Figure::updateBoundingBoxHelper (void* data)
{
  gh_manager::auto_lock lock;

  UpdateBoundingBoxData* d = reinterpret_cast<UpdateBoundingBoxData*> (data);
  graphics_object go = gh_manager::get_object (d->m_handle);

  if (go.valid_object ())
    {
      figure::properties& fp = Utils::properties<figure> (go);

      //qDebug ("Figure::updateBoundingBoxHelper: internal=%d, bbox=[%g %g %g %g]",
      //        d->m_internal, d->m_bbox(0), d->m_bbox(1), d->m_bbox(2), d->m_bbox(3));
      fp.set_boundingbox (d->m_bbox, d->m_internal, false);

      if (d->m_internal)
        emit d->m_figure->asyncUpdate ();
    }

  delete d;
}

void Figure::updateBoundingBox (bool internal, int flags)
{
  QWidget* win = qWidget<QWidget> ();
  Matrix bb (1, 4);

  if (internal)
    {
      QRect r = m_innerRect;

      if (flags & UpdateBoundingBoxPosition)
        r.moveTopLeft (win->mapToGlobal (m_container->pos ()));
      if (flags & UpdateBoundingBoxSize)
        r.setSize (m_container->size ());

      if (r.isValid () && r != m_innerRect)
        {
          //qDebug() << "inner rect changed:" << m_innerRect << "->>" << r;
          m_innerRect = r;

          bb(0) = r.x ();
          bb(1) = r.y ();
          bb(2) = r.width ();
          bb(3) = r.height ();
        }
      else
        return;
    }
  else
    {
      QRect r = m_outerRect;

      if (flags & UpdateBoundingBoxPosition)
        r.moveTopLeft (win->pos ());
      if (flags & UpdateBoundingBoxSize)
        r.setSize (win->frameGeometry ().size ());

      if (r.isValid () && r != m_outerRect)
        {
          //qDebug() << "outer rect changed:" << m_outerRect << "->>" << r;
          m_outerRect = r;

          bb(0) = r.x ();
          bb(1) = r.y ();
          bb(2) = r.width ();
          bb(3) = r.height ();
        }
      else
        return;
    }

  UpdateBoundingBoxData* d = new UpdateBoundingBoxData ();

  d->m_bbox = bb;
  d->m_internal = internal;
  d->m_handle = m_handle;
  d->m_figure = this;

  //qDebug ("Figure::updateBoundingBox: internal=%d, bbox=[%g %g %g %g]",
  //        d->m_internal, d->m_bbox(0), d->m_bbox(1), d->m_bbox(2), d->m_bbox(3));
  gh_manager::post_function (Figure::updateBoundingBoxHelper, d);
}

bool Figure::eventNotifyBefore (QObject* obj, QEvent* event)
{
  if (! m_blockUpdates)
    {
      if (obj == m_container)
        {
          // Do nothing...
        }
      else if (obj == m_menuBar)
        {
          switch (event->type ())
            {
            case QEvent::ActionRemoved:
                {
                  QAction* a = dynamic_cast<QActionEvent*> (event)->action ();

                  if (! a->isSeparator ()
                      && a->objectName () != "builtinMenu")
                    updateMenuBar ();
                }
              break;
            default:
              break;
            }
        }
      else
        {
          switch (event->type ())
            {
            case QEvent::Close:
              event->ignore ();
              gh_manager::post_callback (m_handle, "closerequestfcn");
              return true;
            default:
              break;
            }
        }
    }

  return false;
}

void Figure::eventNotifyAfter (QObject* watched, QEvent* event)
{
  if (! m_blockUpdates)
    {
      if (watched == m_container)
        {
          switch (event->type ())
            {
            case QEvent::Resize:
              updateBoundingBox (true, UpdateBoundingBoxSize);
              break;
            case QEvent::ChildAdded:
              if (dynamic_cast<QChildEvent*> (event)->child
                  ()->isWidgetType())
                {
                  gh_manager::auto_lock lock;
                  const figure::properties& fp = properties<figure> ();

                  showFigureToolBar (! hasUiControlChildren (fp));
                }
            default:
              break;
            }
        }
      else if (watched == m_menuBar)
        {
          switch (event->type ())
            {
            case QEvent::ActionAdded:
                {
                  QAction* a = dynamic_cast<QActionEvent*> (event)->action ();

                  if (! a->isSeparator ()
                      && a->objectName () != "builtinMenu")
                    updateMenuBar ();
                }
              break;
            default:
              break;
            }
        }
      else
        {
          switch (event->type ())
            {
            case QEvent::Move:
              updateBoundingBox (false, UpdateBoundingBoxPosition);
              updateBoundingBox (true, UpdateBoundingBoxPosition);
              break;
            case QEvent::Resize:
              updateBoundingBox (false, UpdateBoundingBoxSize);
              break;
            default:
              break;
            }
        }
    }
}

void Figure::helpAboutQtHandles (void)
{
  QMessageBox::about (qWidget<QMainWindow> (), tr ("About QtHandles"),
                      ABOUT_TEXT);
}

void Figure::fileNewFigure (void)
{
}

void Figure::fileCloseFigure (void)
{
  qWidget<QMainWindow> ()->close ();
}

void Figure::editCopy (void)
{
}

void Figure::editCut (void)
{
}

void Figure::editPaste (void)
{
}

void Figure::addCustomToolBar (QToolBar* bar, bool visible)
{
  QMainWindow* win = qWidget<QMainWindow> ();

  if (! visible)
    win->addToolBar (bar);
  else
    {
      QSize sz = bar->sizeHint ();
      QRect r = win->geometry ();
      //qDebug () << "Figure::addCustomToolBar:" << r;

      r.adjust (0, -sz.height (), 0, 0);

      m_blockUpdates = true;
      win->setGeometry (r);
      win->addToolBarBreak ();
      win->addToolBar (bar);
      m_blockUpdates = false;

      //qDebug () << "Figure::addCustomToolBar:" << win->geometry ();
      updateBoundingBox (false);
    }
}

void Figure::showCustomToolBar (QToolBar* bar, bool visible)
{
  QMainWindow* win = qWidget<QMainWindow> ();

  if ((! bar->isHidden ()) != visible)
    {
      QSize sz = bar->sizeHint ();
      QRect r = win->geometry ();

      if (visible)
        r.adjust (0, -sz.height (), 0, 0);
      else
        r.adjust (0, sz.height (), 0, 0);

      m_blockUpdates = true;
      win->setGeometry (r);
      bar->setVisible (visible);
      m_blockUpdates = false;

      updateBoundingBox (false);
    }
}

void Figure::updateContainer (void)
{
  redraw ();
}

}; // namespace QtHandles