/*
* This template contains code for creating an empty 
* window in OpenGL. 
*/

#include "glad/glad.h"
#include "GLFW/glfw3.h"
#include "classes/Classes.h"

// Prototypes. 
void framebuffer_size_callback(GLFWwindow *window, int width, int height);
void processInput(GLFWwindow *window);

// Constants. 
const unsigned int WINDOW_WIDTH = 800;
const unsigned int WINDOW_HEIGHT = 600;

int main(void) {
    // Initialisation and configuration. 
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    // Create window. 
    GLFWwindow *window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "OpenGL_Project", NULL, NULL);
    if (window == NULL) {
        LogInfo("Failed to create GLFW window.");
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        LogInfo("Failed to initialise GLAD."); 
        return -1;
    }

    while (!glfwWindowShouldClose(window)) {
        processInput(window);

        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    glfwDestroyWindow(window);
    glfwTerminate();
    return 0;
}

void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
    glViewport(0, 0, width, height);
}

void processInput(GLFWwindow *window) {
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
        glfwSetWindowShouldClose(window, true);
    }
}