#include <glad/glad.c>
// glad must be loaded before GLFW
#include <GLFW/glfw3.h>

#include "graphics.hpp"

#include <iostream>
#include <unistd.h>

void processInput(GLFWwindow *window) {
  // if user presses ESC, close the window
  if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
    glfwSetWindowShouldClose(window, true);
}

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

int mainWindow() {
  /* graphics stuff */
  glfwInit();
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
  // glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

  GLFWwindow *window = glfwCreateWindow(800, 600, "Shader Loader", NULL, NULL);
  if (window == NULL) {
    printf("Failed to create GLFW window\n");
    glfwTerminate();
    return -1;
  }
  glfwMakeContextCurrent(window);

  if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
    printf("Failed to initialize GLAD\n");
    return -1;
  }

  glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

  float vertices[] = {-0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f, 0.0f, 0.5f, 0.0f};

  unsigned int VBO;

  glGenBuffers(1, &VBO);
  glBindBuffer(GL_ARRAY_BUFFER, VBO);
  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

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

    glClearColor(0.8f, 0.4f, 0.1f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    glfwSwapBuffers(window);
    glfwPollEvents();
  }

  glfwTerminate();
  return 0;
}