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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
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*      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen       *
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*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper is free software: you can redistribute it and/or modify       *
*  it under the terms of the GNU Lesser General Public License as            *
*  published by the Free Software Foundation, either version 3 of            *
*  the License, or (at your option) any later version with the               *
*  following exceptions:                                                     *
*                                                                            *
*  If other files instantiate templates or use macros                        *
*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper 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 Lesser General Public License for more details.                       *
*                                                                            *
*  You should have received a copy of the GNU LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
*                                                                            *
\*===========================================================================*/

/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
\*===========================================================================*/
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//== INCLUDES =================================================================
#include <QPolygonF>
#include <QGraphicsItem>
#include <QFontMetrics>
#include <QPainter>

#include "connectionPoint.hh"
#include "connection.hh"
#include "elementInOut.hh"
#include "graphicsScene.hh"
#include "elementArea.hh"
#include "text.hh"
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#include "../parser/inout.hh"
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#define SIZE  20

//== NAMESPACES ===============================================================
namespace VSI {

//=============================================================================
//
//  CLASS VSI::ConnectionPoint - IMPLEMENTATION
//
//=============================================================================


QColor colors_[] = { QColor(255, 0, 0),
                     QColor(255, 0, 255),
                     QColor(255, 128, 0),
                     QColor(224, 224, 0),
                     QColor(0, 192, 0),
                     QColor(0, 0, 255) };

//------------------------------------------------------------------------------

/// Constructor
ConnectionPoint::ConnectionPoint (ElementInOut *_e, QGraphicsItem *_parent) :
  QGraphicsEllipseItem (_parent),
  inout_ (_e),
  width_ (5)
{
  setRect (0, 0, width_, width_);

  setBrush (QColor (64,64,64));

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  setAcceptHoverEvents (true);
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}

//------------------------------------------------------------------------------

/// Destructor
ConnectionPoint::~ConnectionPoint ()
{
}

//------------------------------------------------------------------------------

/// Sets the geometry
void ConnectionPoint::setGeometry (const QRectF &_rect)
{
  QGraphicsEllipseItem::setPos (_rect.topLeft ());
  QGraphicsLayoutItem::setGeometry (_rect);
  setRect (0, 0, width_, width_);
}

//------------------------------------------------------------------------------

// size informations for layouting
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QSizeF ConnectionPoint::sizeHint (Qt::SizeHint _which, const QSizeF &/*_constraint*/) const
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{
  QSizeF sh;
  switch (_which) {
    case Qt::MinimumSize:
    case Qt::PreferredSize:
    case Qt::MaximumSize:
      sh = QSizeF(width_, width_);
      break;
    default:
      break;
  }

  return sh;
}

//------------------------------------------------------------------------------

// start a new connection on press
void ConnectionPoint::mousePressEvent (QGraphicsSceneMouseEvent *_event)
{
  Connection *c = new Connection (this, scene ());
  static_cast<GraphicsScene *>(scene ())->setActiveConnection (c);
  QGraphicsEllipseItem::mousePressEvent(_event);
}

//------------------------------------------------------------------------------

/// Position for connections
QPointF ConnectionPoint::connectPos ()
{
  QGraphicsItem *elementArea = dynamic_cast<GraphicsScene *> (scene ())->elementArea ();
  
  if (inout_->type () == ElementInOut::TypeInput)
    return elementArea->mapFromScene (mapToScene (QPointF (0, width_ / 2)));
  return elementArea->mapFromScene (mapToScene (QPointF (width_, width_ / 2)));
}

//------------------------------------------------------------------------------

/// sets the state
void ConnectionPoint::setState(State _state)
{
  setBrush (colors_[_state]);

  QString stateStr;

  switch (_state)
  {
    case NoValue:
      stateStr = "[NOT CONNECTED]";
      break;
    case Optional:
      stateStr = "[OPTIONAL]";
      break;
    case RuntimeInput:
      stateStr = "[ASK DURING EXECUTION]";
      break;
    case UserInput:
      stateStr = "[CONSTANT SET]";
      break;
    case Connected:
      stateStr = "[CONNECTED]";
      break;
    case OutputNotConnected:
      stateStr = "[NOT CONNECTED]";
      break;
  }

  stateStr += " " + inout_->inOut ()->longDescription () + " (" + inout_->inOut ()->typeString () + ")";
  setToolTip (stateStr);
  inout_->typeTextItem ()->setToolTip (stateStr);
  inout_->descriptionTextItem ()->setToolTip (stateStr);
}

//------------------------------------------------------------------------------

// highlight connection if mouse over
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void ConnectionPoint::hoverEnterEvent (QGraphicsSceneHoverEvent * /*_event*/)
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{
  foreach (Connection *c, inout_->connections ())
  {
    QPen p = c->pen ();

    if (inOut ()->inOut ()->typeString () == "data")
      p.setWidth (6);
    else
      p.setWidth (4);

    p.setColor (QColor (0, 0, 255));
    c->setPen (p);
  }
}

//------------------------------------------------------------------------------

// remove highlight 
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void ConnectionPoint::hoverLeaveEvent (QGraphicsSceneHoverEvent * /*_event*/)
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{
  foreach (Connection *c, inout_->connections ())
  {
    QPen p = c->pen ();

    if (inOut ()->inOut ()->typeString () == "data")
      p.setWidth (4);
    else
      p.setWidth (2);

    p.setColor (QColor (0, 0, 0));
    c->setPen (p);
  }
}

//------------------------------------------------------------------------------

/// Sets the diameter
void ConnectionPoint::setWidth(int _width)
{
  width_ = _width;
  updateGeometry ();
}

//------------------------------------------------------------------------------

// painting
void ConnectionPoint::paint(QPainter *_painter, const QStyleOptionGraphicsItem * _option, QWidget *_widget)
{
  QGraphicsEllipseItem::paint (_painter, _option, _widget);

  float wH = width_ / 2.0;
  float wT = width_ / 3.0;
  float wS = width_ / 6.0;

  QPainterPath path;
  path.moveTo (0, 0);
  path.arcTo (0, 0, width_, width_, 0, 360);

  QRadialGradient rG (QPointF(width_ * 0.8, width_), width_ * 0.8);
  rG.setColorAt(0, QColor (255, 255, 255, 128));
  rG.setColorAt(1, Qt::transparent);
  _painter->setBrush (rG);
  _painter->setPen (Qt::NoPen);
  _painter->drawPath (path);

  path = QPainterPath ();
  path.moveTo (1, wH);
  path.arcTo (1, 1, width_ - 2, width_ - 2, 180, - 165);
  path.cubicTo (QPointF (wH + wT, wH + wS), QPointF (wH + wS, wH - wS), QPointF (wH, wH));
  path.cubicTo (QPointF (wT, wH + wS), QPointF (wS, wH + wS), QPointF (1, wH));

  rG.setCenter (wS, 0);
  rG.setFocalPoint(wS, 0);
  rG.setRadius (width_);
  rG.setColorAt(0, Qt::white);
  rG.setColorAt(1, Qt::transparent);
  _painter->setBrush (rG);
  _painter->setPen (Qt::NoPen);
  _painter->drawPath(path);
}

//------------------------------------------------------------------------------
}