#include "Viewer.h"
#include <X3DTK/GL/renderer.h>

#include <math.h>
#include <iostream>
#include <qfiledialog.h>
#include <qmessagebox.h> 

using namespace X3DTK;
using namespace std;

Viewer::Viewer(const char *file)
: normLength(1.0f), normal(false)
{
  x3dfile = (char *)file;
}

Viewer::~Viewer()
{
  // Releases scene graphs of scene.
  scene.release();
}

void Viewer::keyPressEvent(QKeyEvent *e)
{
  switch (e->key())
  {
    case Qt::Key_L : 
      loadFile(); break;
    case Qt::Key_N : 
      normal = !normal;
      scene.setNormal(normal);
      break;
    case Qt::Key_Minus :
      normLength /= 2.0f;
      scene.setNormalLength(normLength);
      break;
    case Qt::Key_Plus :
      normLength *= 2.0f;
      scene.setNormalLength(normLength);
      break;
    default: 
      QGLViewer::keyPressEvent(e);
  }
  updateGL();
}

void Viewer::loadFile()
{
  QString name = QFileDialog::getOpenFileName("", "X3D files (*.x3d *.X3D);;All files (*)", this);
  
  // In case of Cancel
  if (name.isEmpty())
    return;

  // Loads the file name.
  scene.load(name, false);

  // QGLViewer settings
  setSceneBoundingBox(
    qglviewer::Vec(scene.getBBoxMin()[0],scene.getBBoxMin()[1],scene.getBBoxMin()[2]), 
    qglviewer::Vec(scene.getBBoxMax()[0],scene.getBBoxMax()[1],scene.getBBoxMax()[2])
  );
  showEntireScene();
}

void Viewer::init()
{
#ifdef GL_RESCALE_NORMAL
  glEnable(GL_RESCALE_NORMAL);
#endif
  about();
  loadFile();
}

void Viewer::draw()
{
  // Draws the scene.
  scene.draw();
}

void Viewer::about()
{
  QMessageBox::about(this, "about the glNormalViewer", "this is an example showing how to create a new processor that displays the normals of a model.Type 'h' to display help");
}

QString Viewer::helpString() const
{
  QString message("");
  
  message += "<b>N</b>" + QString(" enables or disables the display of normals<br>");
  message += "<b>+</b>" + QString(" increases the length of normals<br>");
  message += "<b>-</b>" + QString(" decreases the length of normals<br>");
  message += "<b>L</b>" + QString(" loads a new file<br>");
  
  message += QGLViewer::helpString();
  
  return message;
}

void Viewer::help() const
{
  QMessageBox *mb = new QMessageBox("help", helpString(), QMessageBox::NoIcon,QMessageBox::Ok | QMessageBox::Default, QMessageBox::NoButton,QMessageBox::NoButton, NULL, "Help", false,Qt::WStyle_DialogBorder | Qt::WType_Dialog | Qt::WDestructiveClose);
  mb->show();
}