#include <stdlib.h>
#include <stdio.h>

#include <SDL2/SDL.h>

/**
 * I finally find out how this SDL should work on my machine.
 * In the past, I just so dumb to not initialize its renderer.
 *
 * On this case, I create renderer and let it render the black screen with `SDL_SetRenderDrawColor`.
 *
 * Important notes for me:
 * 1. The window would show nothing if it has no renderer.
 * 2. We MUST use one (at least) infinite loop on main thread, which is also handling triggered event.
 * 3. RenderClear here is only for debugging purpose, this help me to see the black screen that i've declared before.
 * 4. RenderPresent helps to updating the screen.
 * 5. DestroyWindow && Quit at the end.
 * 6. SDL Blocking the KDE's compositor, don't be panic if your GUI being messed up (sacrifice the appearance to the performance).
 */
int main(int argc, char **argv)
{
    int init_status = SDL_Init(SDL_INIT_EVERYTHING);
    if (init_status != 0) {
        fprintf(stderr, "Error on initialize the SDL.\n==> Error message: %s\n==> Error code: %d\n", SDL_GetError(), init_status);
        return EXIT_FAILURE;
    }

    SDL_Window *window = SDL_CreateWindow(
        "ChaerEngine - A Simple game engine written by @KennFatt",
        100, 100,
        640, 480,
        SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_RESIZABLE
    );
    if (window == NULL) {
        fprintf(stderr, "Error on create window. Error message: %s\n", SDL_GetError());
        return EXIT_FAILURE;
    }

    SDL_Renderer *renderer = SDL_CreateRenderer(
        window,
        -1,
        SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC
    );
    if (renderer == NULL) {
        SDL_DestroyWindow(window);
        fprintf(stderr, "Error on create renderer. Error message: %s\n", SDL_GetError());
        return EXIT_FAILURE;
    }

    SDL_Event ev;
    int err = 0;
    while (!err) {
        while (SDL_PollEvent(&ev)) {
            switch (ev.type) {
                case SDL_QUIT:
                    err = 1;
                break;

                default:
                    fprintf(stdout, "[Debug] Event type: %d\n", ev.type);
                break;
            }
        }

        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);
        SDL_RenderPresent(renderer);
    }

    SDL_DestroyWindow(window);
    SDL_Quit();

    return EXIT_SUCCESS;
}