#include <GLFW/glfw3.h>
#include <stdio.h>
#include <stdlib.h>

#define GL_SILENCE_DEPRECATION 1

int main() {
  // Initialize GLFW
  if (!glfwInit()) {
    return -1;
  }

  // Set the required options for GLFW
  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); // Required on Mac

  // Create a windowed mode window and its OpenGL context
  GLFWwindow *window = glfwCreateWindow(800, 600, "Blue screen", NULL, NULL);
  if (!window) {
    glfwTerminate();
    return -1;
  }

  glfwMakeContextCurrent(window);

  float vertices[6] = {-0.5f, -0.5f, 0.0f, 0.5f, 0.5f, -0.5f};

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

  const char *vertex_shader_src =
      "#version 330 core\n"
      "layout (location = 0) in vec3 aPos;\n"
      "void main()\n"
      "{\n"
      "   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
      "}\0";

  unsigned int vertex_shader;
  vertex_shader = glCreateShader(GL_VERTEX_SHADER);
  glShaderSource(vertex_shader, 1, &vertex_shader_src, NULL);
  glCompileShader(vertex_shader);

  int success;
  char info_log[512];
  glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);

  if (!success) {
    glGetShaderInfoLog(vertex_shader, 512, NULL, info_log);
    printf("ERROR::SHADER::VERTEX::COMPILATION_FAILED %s\n", info_log);
  }

  while (!glfwWindowShouldClose(window)) {
    glClearColor(0.1f, 0.1f, 0.25f, 0.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    glfwSwapBuffers(window);

    glfwPollEvents();
  }

  glfwTerminate();
  return 0;
}