#include <SDL.h>
#include <SDL_image.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include "kiss.h"

char *title = "SDL 04 - Key Presses";
SDL_Window *window;
SDL_Surface *screen;
SDL_Surface *image;

int
init_sdl(void)
{
   int status = -1;
   int x = SDL_WINDOWPOS_UNDEFINED;
   int y = SDL_WINDOWPOS_UNDEFINED;
   int width = 800;
   int height = 366;
   int flags = 0;       // SDL_WINDOW_FULLSCREEN_DESKTOP

   SDL_INIT(SDL_INIT_VIDEO);
   IMG_INIT(IMG_INIT_PNG);
   window = SDL_CREATEWINDOW(title, x, y, width, height, flags);
   screen = SDL_GETWINDOWSURFACE(window);
   status = 0;
error:
   return status;
}

#define INIT_SDL(...) SDL_ZERO(init_sdl, __VA_ARGS__)

void
close_sdl(void)
{
   SDL_DestroyWindow(window);
   SDL_Quit();
}

int
draw(int x, int y)
{
   int status = -1;
   uint32_t colour = SDL_MapRGB(screen->format, 0xFF, 0x7F, 0x3F);
   SDL_Rect dstrect = { x, y, image->w, image->h };
   SDL_FILLRECT(screen, NULL, colour);
   SDL_BLITSURFACE(image, NULL, screen, &dstrect);
   SDL_UPDATEWINDOWSURFACE(window);
   status = 0;
error:
   return status;
}

#define DRAW(...) SDL_ZERO(draw, __VA_ARGS__)

int x = 0;
int y = 0;
int d = 4;

void
key_down(SDL_Keycode k)
{
   switch (k)
     {
      case SDLK_LEFT:
        x -= d;
        break;

      case SDLK_RIGHT:
        x += d;
        break;

      case SDLK_UP:
        y -= d;
        break;

      case SDLK_DOWN:
        y += d;
        break;

      default:
        x = 0;
        y = 0;
        break;
     }
}

int
main(void)
{
   int exit_status = EXIT_FAILURE;
   bool quit = 0;
   SDL_Event e;

   INIT_SDL();

   image = IMG_LOAD("logo.png");

   while (!quit)
     {
        DRAW(x, y);
        SDL_WAITEVENT(&e);
        if (e.type == SDL_QUIT)
          quit = 1;
        else if (e.type == SDL_KEYDOWN)
          key_down(e.key.keysym.sym);
     }

   exit_status = EXIT_SUCCESS;
error:
   SDL_FreeSurface(image);
   close_sdl();
   exit(exit_status);
}