#include <cstdio>
#include <GL/glew.h>
#include <SDL3/SDL.h>
#include <SDL3/SDL_error.h>
#include <SDL3/SDL_events.h>
#include <SDL3/SDL_oldnames.h>
#include <SDL3/SDL_video.h>

int main(int argc, char** argv) {
  /* Init SDL. */
  if(!SDL_Init(SDL_INIT_VIDEO)) {
    printf("SDL could not initialise! SDL_ERROR: %s\n", SDL_GetError());
    return 1;
  }

  /* Set OpenGL attributes. */
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

  /* Create a window. */
  SDL_Window* window = SDL_CreateWindow(
    "Bettola Client",
    1280,
    720,
    SDL_WINDOW_OPENGL
  );

  if(window == NULL) {
    printf("Unable to create window! SDL_ERROR: %s\n", SDL_GetError());
    return 1;
  }

  /* Create OpenGL context. */
  SDL_GLContext context = SDL_GL_CreateContext(window);
  if(context == NULL) {
    printf("OpenGL context could not be created! SDL_ERROR: %s\n", SDL_GetError());
    return 1;
  }

  /* Initialise GLEW. */
  glewExperimental = GL_TRUE;
  GLenum glewError = glewInit();
  if(glewError != GLEW_OK) {
    printf("Error initialising GLEW! %s\n", glewGetErrorString(glewError));
    return 1;
  }

  printf("SDL/OpenGL initialisation succes.\n");

  bool running = true;
  while(running) {
    /* Event handling. */
    SDL_Event event;
    while(SDL_PollEvent(&event)) {
      if(event.type == SDL_EVENT_QUIT) {
        running = false;
      }
    }

    /* Rendering. */
    glClearColor(0.1f, 0.1f, 0.1, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    /* It's really odd to call it SwapWindow now, rather than SwapBuffer. */
    SDL_GL_SwapWindow(window);
  }

  /* Cleanup. */
  SDL_GL_DestroyContext(context);
  SDL_DestroyWindow(window);
  SDL_Quit();

  return 0;
}