#include "Utilities/gl_utilities.h"
#include <QtOpenGL>
#include <iostream>
#include "GLwindow.h"
using namespace Physika;

void GLwindow::initializeGL()
{
	if (glewInit() != GLEW_OK)
	{
		std::cout << "error: can't init glew!\n";
		std::exit(EXIT_FAILURE);
	}
	else {
		std::cout << "glew init successful" << std::endl;
	}
	glVerify(glClearColor(0.0, 0.2, 0.3, 1.0));
	glVerify(glShadeModel(GL_SMOOTH));
	glVerify(glEnable(GL_DEPTH_TEST));

	std::cout << "hahahaha" << std::endl;

	Driver::initGLResource();
}

void GLwindow::paintGL()
{
	glClearColor(0.2f, 0.3f, 0.3f, 10.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	Driver::draw(dynamic_cast<CameraInterface&>(camera));
}

void GLwindow::resizeGL(int w, int h)
{
	glViewport(0, 0, w, h);
	camera.setAspect(float(w) / h);
}

void GLwindow::mousePressEvent(QMouseEvent * event)
{
	lastPos = event->pos();
}

void GLwindow::mouseMoveEvent(QMouseEvent * event)
{
	QPoint pos = event->pos();
	QPoint deltaPos = pos - lastPos;
	lastPos = pos;
	float scale = 0.02f;  //sensitivity of the mouse
	float camera_radius = glm::length(camera.getFocusPosition() - camera.getPosition());
	if (event->buttons() & Qt::LeftButton) {
		camera.orbitLeft(deltaPos.x() *scale);
		camera.orbitUp(deltaPos.y()*scale);
	}
	if (event->buttons() & Qt::MiddleButton) {
		camera.zoomIn(camera_radius*deltaPos.y()*scale);
	}
	if (event->buttons() & Qt::RightButton) {
		scale *= 0.1f;
		camera.translateLeft(camera_radius*deltaPos.x()*scale);
		camera.translateUp(camera_radius*deltaPos.y()*scale);
	}
}

void GLwindow::wheelEvent(QWheelEvent * event)
{
	float scale = 0.02f;  //sensitivity of the mouse
	float camera_radius = glm::length(camera.getFocusPosition() - camera.getPosition());
	QPoint scroll = event->angleDelta();

	if (scroll.y() > 0)camera.zoomOut(camera_radius*scale);
	else if (scroll.y() < 0)camera.zoomIn(camera_radius*scale);

	lastPos = event->pos();
}