#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>


void e() { std::cout << "breakpoint" << std::endl; };

void instantiateGLFWWindow() 
{
    glfwInit(); // we initialize glfw
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); 
    // we configure glfw , 
    // first argument is what option we want to configure, // the second sets the value of the option
    // see: https://www.glfw.org/docs/latest/window.html#window_hints
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    // We tell glfw we want to use smaller subset of OGL features without backwards-compatible one
    //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
    // We would use this one if we worked on macOs
}

int createWindowObject()
{
    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
    // we provide width and height of window
    // then name of the window
    // we ignore last 2 parameters
    // function returns  GLFW window object that we will use for other glfw operations
    if (window == NULL)
    {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
    // context of our window becomes the main context of current thread
    glfwMakeContextCurrent(window);
    return 0;
}

int initializeGLAD()
{
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
    {
    std::cout << "Failed to initialize GLAD" << std::endl;
    return -1;
    }    
    return 0;
}

int main()
{   
    if(initializeGLAD() == -1) return -1;
    instantiateGLFWWindow();
    if(createWindowObject() == -1) return -1;
    e();
    return 0;

}