#include <cstdlib>
#include <ctime>

#include <QGuiApplication>
#include <QScreen>
#include <QWidget>
#include <QMenuBar>
#include <QFileDialog>
#include <QInputDialog>
#include <QDirIterator>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>
#include <QTextStream>
#include <QJsonObject>
#include <QJsonArray>
#include <QJsonDocument>
#include <QMessageBox>

#include <QDebug>

#include "Experiment.hpp"


Experiment::Experiment ():QMainWindow()
{
  createActions ();
  createMenus ();
  
  filenames = NULL;
  filenames_json = NULL;
  suffix = NULL;
  choice = NULL;
  algo_side='X';
  dNFixed = false;
  expeInit = false;

  setWindowTitle (tr ("DSL - Draw Strength Line"));

  QScreen *screen = QGuiApplication::primaryScreen ();
  QRect screenGeometry = screen->geometry ();
  screenWidth = screenGeometry.width () - 200;
  screenHeight = screenGeometry.height () - 200;

  QWidget *central= new QWidget(this);
  setCentralWidget (central);
  setContentsMargins(0, 0, 0, 0);

  QVBoxLayout *layoutV = new QVBoxLayout(central);
  layoutV->setSpacing(0);
  layoutV->setContentsMargins(0, 0, 0, 0);
  central->setLayout(layoutV);

  // First line of the interface
  QHBoxLayout *layoutH1 = new QHBoxLayout(central);
  layoutH1->setSpacing(0);
  layoutH1->setContentsMargins(0, 0, 0, 0);
  layoutV->addLayout(layoutH1);
  
  waLeft = new WorkArea (((screenWidth-spaceInBetween)/2), screenHeight, central);
  waLeft->setContentsMargins(0, 0, 0, 0);
  layoutH1->addWidget(waLeft);

  QWidget *w1SpaceInBetween = new QWidget(central);
  w1SpaceInBetween->setContentsMargins(0, 0, 0, 0);
  w1SpaceInBetween->setFixedSize(spaceInBetween,0);
  layoutH1->addWidget(w1SpaceInBetween);
  
  waRight = new WorkArea (((screenWidth-spaceInBetween)/2), screenHeight, central);
  waRight->setContentsMargins(0, 0, 0, 0);
  layoutH1->addWidget(waRight);

  // second line of interface
  QWidget *hSpaceInBetween = new QWidget(central);
  hSpaceInBetween->setContentsMargins(0, 0, 0, 0);
  hSpaceInBetween->setFixedSize(0, spaceInBetween);
  layoutV->addWidget(hSpaceInBetween);

  // third line of interface
  QHBoxLayout *layoutH2 = new QHBoxLayout(central);
  layoutH2->setSpacing(0);
  layoutH2->setContentsMargins(0, 0, 0, 0);
  layoutV->addLayout(layoutH2);

  leftButton = new QPushButton("Image de gauche", central);
  leftButton->setFixedHeight(30);
  connect(leftButton, SIGNAL(clicked(bool)), this, SLOT(leftImage()));
  layoutH2->addWidget(leftButton);

  QWidget *w2SpaceInBetween = new QWidget();
  w2SpaceInBetween->setContentsMargins(0, 0, 0, 0);
  w2SpaceInBetween->setFixedSize(spaceInBetween,0);
  layoutH2->addWidget(w2SpaceInBetween);

  rightButton = new QPushButton("Image de droite", central);
  rightButton->setFixedHeight(30);
  connect(rightButton, SIGNAL(clicked(bool)), this, SLOT(rightImage()));
  layoutH2->addWidget(rightButton);

  // Fourth line of the interface
  progressBar = new QProgressBar(central);
  progressBar->setFixedHeight(20);
  progressBar->setRange(0, maxProgressBar);
  progressBar->setValue(0);
  layoutV->addWidget(progressBar);

  timer = new QTimer(central);
  timer->setSingleShot(false);
  timer->setInterval(time);
  
  setFixedSize (screenWidth, screenHeight);

}

void
Experiment::start ()
{

  QString dir;
  QString* directoryname;
  
  if(!dNFixed)
    {
      dir = QString(QDir::currentPath()+"/data");
      directoryname = new QString(dir);
      
      QDir::setCurrent(*directoryname);
      dNFixed = true;
    }else
    {
      dir = QString(QDir::currentPath());
      directoryname = new QString(dir);
    }

  
  if(!(QDir(*directoryname).exists()))
    {
      QMessageBox msgBox;
      msgBox.setText("Data files can't be found. data folder is nedded.");
      msgBox.exec();
      std::exit(EXIT_FAILURE);
    }
  
  if(!dir.isEmpty())
    {
      bool ok=false;
      suffix = new QString(QInputDialog::getText(this, tr("Your ID"),
						 tr("ID to use :"), QLineEdit::Normal,
						 QDir::home().dirName(), &ok));

      if((*suffix) == "algo" || (*suffix) == "random" || (*suffix) == "_algo" || (*suffix) == "_random")
	{
	  QMessageBox msgBox;
	  msgBox.setText("Your name can't be [_]algo or [_]random.");
	  msgBox.exec();
	  ok = false;
	}
      
      if(ok)
	{
	  delete filenames;
	  delete filenames_json;
	  delete choice;
	  filenames = new QStringList();
	  filenames_json = new QStringList();
	  choice = new QStringList();
	  
	  QDirIterator it(*directoryname, {"*.jpg"}, QDir::Files);
	  while (it.hasNext()) {
	    filenames->append( it.next() );
	  }

	  for(int i = 0 ; i<filenames->size() ; i++)
	    {
	      QString jsonFile(QDir::currentPath ().append("/").append(QFileInfo(filenames->at(i)).baseName().append(*suffix_IA).append(".json")));
	      if(! (QFile(jsonFile).exists()) )
		{
		  qDebug() << "ATTENTION !!!! " << jsonFile << " file missing";
		  ok=false;
		}else{
		filenames_json->append(jsonFile);
	      }
	    }

	  if(!ok)
	    std::exit(EXIT_FAILURE);

	  std::srand(static_cast<unsigned int>(std::time(nullptr)+std::rand())); 
	  
	  for(int i = 0 ; i<filenames->size()*2 ; i++)
	    {
	      int rand1 = std::rand()%filenames->size();
	      int rand2 = std::rand()%filenames->size();
	      filenames->swapItemsAt(rand1, rand2);
	      filenames_json->swapItemsAt(rand1, rand2);
	    }
	  openedImage = -1;

	  expeInit = true;
	  openNext();
	}
    }
  
}

void Experiment::leftImage(){
  if(expeInit)
    {
      if((algo_side != 'L') && (algo_side != 'R'))
	{
	  qDebug() << "Something went wrong";
	  QApplication::quit();
	}
      if(algo_side == 'L')
	choice->append(QString("algo"));
      else
	choice->append(QString("random"));
      
      openNext();
    }
}

void Experiment::rightImage(){
  if(expeInit)
    {
      if((algo_side != 'L') && (algo_side != 'R'))
	{
	  qDebug() << "Something went wrong";
	  QApplication::quit();
	}
      if(algo_side == 'R')
	choice->append(QString("algo"));
      else
	choice->append(QString("random"));
      
      openNext();
    }
}


void
Experiment::openNext (){
  openedImage = openedImage+1;
  
  progressBar->setValue((int)((openedImage+1.0)/(filenames->size())*100.0));
  
  if(openedImage >= filenames->size())
    {
      qDebug() << "That's all folks !" << Qt::endl;

      /* Saving result file*/
      QJsonObject root;
      QJsonArray choices;
      
      for (int i = 0; i < choice->size (); i++){
	QJsonObject choiceOnImage;
	choiceOnImage["index"] = i;
	choiceOnImage["image"] = QString(filenames->at(i));
	choiceOnImage["choice"] = QString(choice->at(i));
	choices.push_back(choiceOnImage);
      }
      
      root["choices"] = choices;
      
      QByteArray ba = QJsonDocument(root).toJson();
      QFile fout((*suffix)+QString::fromStdString (".json"));
      fout.open(QIODevice::WriteOnly);
      fout.write(ba);
      
      QApplication::quit();
    }
  else
    {

      waLeft->loadImage (filenames->at(openedImage).toStdString ());
      waRight->loadImage (filenames->at(openedImage).toStdString ());

      std::srand(static_cast<unsigned int>(std::time(nullptr)+std::rand()));
      if((std::rand()%2) == 0)
	{
	  waLeft->loadSL (filenames_json->at(openedImage).toStdString ());
	  algo_side='L';
	  for(int i = 0 ; i < waLeft->getNumberOfLines() ; i++)
	    {
	      waRight->addRandomSL();
	      QString jsonFile = QDir::currentPath ().append("/").append(QFileInfo(filenames->at(openedImage)).baseName().append(QString("_random")).append(".json"));
	      waRight->saveStrengthLine (jsonFile.toStdString ());
	    }
	}
      else
	{
	  waRight->loadSL (filenames_json->at(openedImage).toStdString ());
	  algo_side='R';
	  for(int i = 0 ; i < waRight->getNumberOfLines() ; i++)
	    {
	      waLeft->addRandomSL();
	      QString jsonFile = QDir::currentPath ().append("/").append(QFileInfo(filenames->at(openedImage)).baseName().append(QString("_random")).append(".json"));
	      waLeft->saveStrengthLine (jsonFile.toStdString ());
	    }
	}
      waLeft->setReadOnly(true);
      waRight->setReadOnly(true);
      waLeft->repaint();
      waRight->repaint();
      setFixedSize (waLeft->geometry().width()*2+spaceInBetween, waLeft->geometry().height()+waLeft->geometry().y()+spaceInBetween+leftButton->geometry().height()+22); // +22 ??!!
    }

}

void
Experiment::createActions ()
{
  startAct = new QAction (tr ("&Start"), this);
  startAct->setShortcuts (QKeySequence::Save);
  connect (startAct, &QAction::triggered, this, &Experiment::start);

  exitAct = new QAction (tr ("E&xit"), this);
  exitAct->setShortcuts (QKeySequence::Quit);
  connect (exitAct, &QAction::triggered, this, &QWidget::close);
}

void
Experiment::createMenus ()
{
  fileMenu = menuBar ()->addMenu (tr ("&File"));
  fileMenu->addAction (startAct);

  fileMenu->addSeparator ();

  fileMenu->addAction (exitAct);
}