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

#include <QDebug>
#include <QStringList>

#include "WorkArea.hpp"

#include "StrengthLine.hpp"

WorkArea::WorkArea (int screenSizeX, int screenSizeY, QWidget * parent):
  QWidget(parent)
{
  this->screenSizeX = screenSizeX;
  this->screenSizeY = screenSizeY;
  readOnly = false;
  img = NULL;
  indexPointClicked = -1;

}

WorkArea::WorkArea (int screenSizeX, int screenSizeY, const std::string & filename, QWidget * parent):QWidget(parent)
{
  this->screenSizeX = screenSizeX;
  this->screenSizeY = screenSizeY;
  readOnly = false;
  img = NULL;
  indexPointClicked = -1;
  loadImage(filename);
}

WorkArea::WorkArea (int screenSizeX, int screenSizeY, const std::string & imageFilename, const std::string & SLFilename, bool readOnly, QWidget * parent):QWidget(parent)
{
  this->screenSizeX = screenSizeX;
  this->screenSizeY = screenSizeY;
  img = NULL;
  indexPointClicked = -1;
  loadImage(imageFilename);
  this->readOnly = readOnly;
  loadSL(SLFilename);
  /*QFile file(QString::fromStdString (SLFilename));
  if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    return;
  
  QTextStream in(&file);
  while (!in.atEnd()) {
    QString line = in.readLine();
    QStringList parts = line.split(" ");
    liste_points << new QPoint(parts[0].toInt(), parts[1].toInt());
    liste_points << new QPoint(parts[2].toInt(), parts[3].toInt());
  }
  file.close();*/
  
}

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::loadSL (const std::string & filename)
{
  liste_points.clear();
  QFile file(QString::fromStdString (filename));
  if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    return;
  
  QTextStream in(&file);
  while (!in.atEnd()) {
    QString line = in.readLine();
    QStringList parts = line.split(" ");
    liste_points << new QPoint(parts[0].toInt(), parts[1].toInt());
    liste_points << new QPoint(parts[2].toInt(), parts[3].toInt());
  }
  file.close();
}

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::setReadOnly(bool readOnly){
  this->readOnly = readOnly;
}


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++)
    {
      if(readOnly==false)
	{
	  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(readOnly==false)
    {
      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(readOnly==false)
    {
      if (indexPointClicked != -1)
	{
	  liste_points[indexPointClicked]->setX (event->x ());
	  liste_points[indexPointClicked]->setY (event->y ());
	}
    }
  repaint ();
}

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