#include <QFile>
#include <QColor>
#include <QTextStream>

#include "WorkArea.hpp"

#include "StrengthLine.hpp"

WorkArea::WorkArea (int screenSizeX, int screenSizeY, QWidget * parent):
  QWidget
{
parent}

{
  this->screenSizeX = screenSizeX;
  this->screenSizeY = screenSizeY;
  indexPointClicked = -1;

  img = NULL;
}

WorkArea::~WorkArea ()
{
}

void
WorkArea::loadImage (const std::string & filename)
{
  img =
    new QImage (QImage (QString::fromStdString (filename)).
		scaled (screenSizeX, screenSizeY - this->geometry ().y (),
			Qt::KeepAspectRatio, Qt::FastTransformation));
  liste_points.clear ();
  resize (img->width (), img->height ());
}

void
WorkArea::saveStrengthLine (const std::string & filename)
{
  QFile file (QString::fromStdString (filename));

  if (!file.open (QIODevice::WriteOnly | QIODevice::Text))
    return;

  QTextStream out (&file);
  for (int i = 0; i < liste_points.size () / 2; i++)
    out << liste_points[i*2]->x () << " " << liste_points[i*2]->y () << " " << liste_points[i*2+1]->x () << " " << liste_points[i*2+1]->y () << "\n";

  file.close ();
}


void
WorkArea::paintEvent (QPaintEvent * event)
{
  QPainter painter (this);
  paint (painter);
}

void
WorkArea::paint (QPainter & painter)
{
  if (img != NULL)
    painter.drawImage (0, 0, *img);

  for (int i = 0; i < liste_points.length (); i++)
    {
      painter.setBrush (QBrush (Qt::green));
      painter.setPen (QPen (Qt::black));
      painter.drawEllipse (liste_points[i]->x () - taillePoint / 2,
			   liste_points[i]->y () - taillePoint / 2,
			   taillePoint, taillePoint);


      if ((i % 2) == 1)
	{
	  painter.setPen (QPen (Qt::red, epaisseurLigne));
	  std::pair < QPoint *, QPoint * >endPoints =
	    StrengthLine (liste_points[i - 1], liste_points[i]).toDraw (img);
	  painter.drawLine (*(std::get < 0 > (endPoints)),
			    *(std::get < 1 > (endPoints)));
	}

    }

}

void
WorkArea::mousePressEvent (QMouseEvent * event)
{
  if (img != NULL)
    {
      // Est ce qu'on a cliqué sur un point existant ?
      indexPointClicked = -1;
      for (int i = 0; i < liste_points.length (); i++)
	{
	  QPoint point = event->pos () - *(liste_points[i]);
	  if (point.manhattanLength () < taillePoint)
	    {
	      indexPointClicked = i;
	    }
	}

      // Clic gauche
      if (event->button () == Qt::LeftButton)
	{
	  if (indexPointClicked == -1)
	    {
	      indexPointClicked = liste_points.size ();
	      liste_points << new QPoint (event->x (), event->y ());
	    }
	}
      // Clic droit
      if (event->button () == Qt::RightButton)
	{
	  if (indexPointClicked != -1)
	    {
	      if (indexPointClicked == (liste_points.size () - 1))
		liste_points.removeAt (indexPointClicked);
	      else
		{
		  if ((indexPointClicked % 2) == 0)
		    {
		      QPoint *single =
			liste_points.takeAt (indexPointClicked + 1);
		      liste_points.removeAt (indexPointClicked);
		      liste_points << single;
		    }
		  else
		    {
		      QPoint *single =
			liste_points.takeAt (indexPointClicked - 1);
		      liste_points.removeAt (indexPointClicked - 1);
		      liste_points << single;
		    }
		}
	      indexPointClicked = -1;
	    }
	}
    }
  repaint ();
}

void
WorkArea::mouseMoveEvent (QMouseEvent * event)
{
  if (indexPointClicked != -1)
    {
      liste_points[indexPointClicked]->setX (event->x ());
      liste_points[indexPointClicked]->setY (event->y ());
    }
  repaint ();
}

void
WorkArea::mouseReleaseEvent (QMouseEvent * event)
{
  indexPointClicked = -1;
}