#include "Skybox.h"
#include <cmath>
#include <fstream>
#include <iostream>
#include <QMessageBox>
#include "Model.h"

using namespace std;

Skybox::Skybox() {

    // the position buffer
    positionBuffer = QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
    positionBuffer.setUsagePattern(QOpenGLBuffer::StaticDraw);
    positionBuffer.create();
    positionBuffer.bind();
    positionBuffer.allocate(&positions[0],
                            positions.size() * sizeof(QVector3D));
    positionBuffer.release();

	  // An dieser Stelle wird wieder die nullte Texturebene genutzt.
	  //glActiveTexture(GL_TEXTURE0);

	  skyImages.resize(6);

	  skyImages[0] = std::unique_ptr<QImage>(new QImage(
		  QString("skybox/right.png")));
	  skyImages[1] =
		  std::unique_ptr<QImage>(new QImage(QString("skybox/back.png")));
	  skyImages[2] = std::unique_ptr<QImage>(
		  new QImage(QString("skybox/down.png")));
	  skyImages[3] = std::unique_ptr<QImage>(new QImage(
		  QString("skybox/front.png")));
	  skyImages[4] = std::unique_ptr<QImage>(
		  new QImage(QString("skybox/left.png")));
	  skyImages[5] = std::unique_ptr<QImage>(new QImage(QString("skybox/up.png")));

	  texture = std::make_shared<QOpenGLTexture>(QOpenGLTexture::TargetCubeMap);
	  texture->create();
	  texture->setSize(skyImages[0]->width(), skyImages[0]->height(), skyImages[0]->depth());
	  texture->setFormat(QOpenGLTexture::RGBA8U);
	  texture->allocateStorage();



	  for (size_t i = 0; i < faces.size(); i++) {
		  texture->setData(0, 0, faces[i], QOpenGLTexture::RGBA, QOpenGLTexture::UInt8, skyImages[i]->constBits());
	  }

	  texture->setWrapMode(QOpenGLTexture::ClampToEdge);
	  texture->setMinificationFilter(QOpenGLTexture::LinearMipMapLinear);
	  texture->setMagnificationFilter(QOpenGLTexture::LinearMipMapLinear);
	  texture->generateMipMaps();

}

void Skybox::render(std::shared_ptr<QOpenGLShaderProgram> program, QVector3D cameraPosition) {

	int positionAttributeID = program->attributeLocation("position");
	program->enableAttributeArray(positionAttributeID);

	positionBuffer = QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
	positionBuffer.setUsagePattern(QOpenGLBuffer::StaticDraw);
	positionBuffer.create();
	positionBuffer.bind();
	positionBuffer.allocate(positions.data(), positions.size() * sizeof(QVector3D));

	//positionBuffer.bind();
	program->setAttributeBuffer(positionAttributeID, GL_FLOAT, 0, 3);
	positionBuffer.release();

	//glDrawArrays(GL_TRIANGLES, 0, 3);
 }