/*
 * nikwi-sdl12.c: the part of the SDL 1.2 API that Nikwi Deluxe uses, on top of SDL2, for the
 * fredygames.com browser build (Emscripten). See nikwi-sdl12.h.
 *
 * The game draws into the "screen" surface of SDL_SetVideoMode (here a 16-bit RGB565 surface in memory,
 * which is what the game's own graphics code assumes); each SDL_Flip uploads it to a streaming texture
 * and presents it.
 *
 * Copyright (C) 2026 FredyGames. Distributed under the same zlib license as Nikwi Deluxe's src/.
 */
#include "nikwi-sdl12.h"

#undef SDL_PollEvent

static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
static SDL_Texture *texture = NULL;
static SDL_Surface *screen = NULL;

SDL_Surface *
SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)
{
  (void) bpp;
  (void) flags;
  if (window == NULL)
    {
      window = SDL_CreateWindow ("Nikwi", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, 0);
      if (window == NULL)
        return NULL;
      renderer = SDL_CreateRenderer (window, -1, 0);
      if (renderer == NULL)
        return NULL;
    }
  if (texture != NULL)
    SDL_DestroyTexture (texture);
  if (screen != NULL)
    SDL_FreeSurface (screen);
  texture = SDL_CreateTexture (renderer, SDL_PIXELFORMAT_RGB565, SDL_TEXTUREACCESS_STREAMING, width, height);
  screen = SDL_CreateRGBSurfaceWithFormat (0, width, height, 16, SDL_PIXELFORMAT_RGB565);
  return screen;
}

int
SDL_Flip (SDL_Surface * surface)
{
  if (surface != screen || texture == NULL)
    return -1;
  SDL_UpdateTexture (texture, NULL, screen->pixels, screen->pitch);
  SDL_RenderClear (renderer);
  SDL_RenderCopy (renderer, texture, NULL, NULL);
  SDL_RenderPresent (renderer);
  return 0;
}

void
SDL_WM_SetCaption (const char *title, const char *icon)
{
  (void) icon;
  if (window != NULL && title != NULL)
    SDL_SetWindowTitle (window, title);
}

int
nikwi_PollEvent (SDL_Event * event)
{
  while (SDL_PollEvent (event))
    {
      if (event->type == SDL_KEYDOWN && event->key.repeat)
        continue;
      return 1;
    }
  return 0;
}