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

using namespace std;

// Constructor initialized with FACE drawing. 

Viewer::Viewer()
: entity(FACE)
{
}

// Changing entity flag.

void Viewer::keyPressEvent(QKeyEvent *e)
{
  switch (e->key())
  {
    case Qt::Key_L : loadFile(); break;
    case Qt::Key_V : entity = VERTEX; break;
    case Qt::Key_E : entity = EDGE; break;
    case Qt::Key_F : entity = FACE; break;
    default        : QGLViewer::keyPressEvent(e);
  }
  // Refreshing drawing to take in account appearance changes.
  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);

  // 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()
{
  loadFile();
}

void Viewer::draw()
{
  if (scene.getMesh() == 0) return;
  
  // Switching entity.
  
  switch (entity)
  {
    case VERTEX:
      drawer.drawVertices(scene.getMesh());
      break;
    case EDGE:
      drawer.drawEdges(scene.getMesh());
      break;
    case FACE:
      drawer.drawFaces(scene.getMesh());
      break;
    default:
      break;      
  }
}

QString Viewer::helpString() const
{
  QString message("");
  
  message += "<b>L</b>" + QString(" loads a new file<br>");
  message += "<b>V</b>" + QString(" draws the vertices<br>");
  message += "<b>E</b>" + QString(" draws the edges<br>");
  message += "<b>F</b>" + QString(" draws the faces<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();
}