#include <isogfx/backend.h>
#include <isogfx/isogfx.h>

#include <gfx/app.h>

#include <assert.h>
#include <stdbool.h>

static const int WINDOW_WIDTH  = 1408;
static const int WINDOW_HEIGHT = 960;
static const int MAX_FPS       = 60;

// Virtual screen dimensions.
static const int SCREEN_WIDTH  = 704;
static const int SCREEN_HEIGHT = 480;

typedef struct GfxAppState {
  IsoBackend* backend;
  IsoGfx*     iso;
  int         xpick;
  int         ypick;
  SpriteSheet stag_sheet;
  Sprite      stag;
} GfxAppState;

static bool init(GfxAppState* state, int argc, const char** argv) {
  assert(state);
  (void)argc;
  (void)argv;

  if (!(state->iso = isogfx_new(&(IsoGfxDesc){
            .screen_width = SCREEN_WIDTH, .screen_height = SCREEN_HEIGHT}))) {
    return false;
  }
  IsoGfx* iso = state->iso;

  isogfx_resize(iso, SCREEN_WIDTH, SCREEN_HEIGHT);

  if (!isogfx_load_world(iso, "/home/jeanne/assets/tilemaps/demo1.tm")) {
    return false;
  }

  if (!isogfx_load_sprite_sheet(
          iso, "/home/jeanne/assets/tilesets/scrabling/critters/stag/stag.ss",
          &state->stag_sheet)) {
    return false;
  }

  state->stag = isogfx_make_sprite(iso, state->stag_sheet);
  isogfx_set_sprite_position(iso, state->stag, 5, 4);

  if (!(state->backend = IsoBackendInit(iso))) {
    return false;
  }

  return true;
}

static void shutdown(GfxAppState* state) {
  assert(state);
  //
}

static void update(GfxAppState* state, double t, double dt) {
  assert(state);
  (void)dt;

  IsoGfx* iso = state->iso;
  isogfx_update(iso, t);
}

static void render(GfxAppState* state) {
  assert(state);

  IsoGfx* iso = state->iso;
  isogfx_render(iso);
  IsoBackendRender(state->backend, iso);
}

static void resize(GfxAppState* state, int width, int height) {
  assert(state);

  IsoBackendResizeWindow(state->backend, state->iso, width, height);
}

int main(int argc, const char** argv) {
  GfxAppState state = {0};
  gfx_app_run(
      &(GfxAppDesc){
          .argc              = argc,
          .argv              = argv,
          .width             = WINDOW_WIDTH,
          .height            = WINDOW_HEIGHT,
          .max_fps           = MAX_FPS,
          .update_delta_time = MAX_FPS > 0 ? 1.0 / (double)MAX_FPS : 0.0,
          .title             = "Isometric Renderer",
          .app_state         = &state},
      &(GfxAppCallbacks){
          .init     = init,
          .update   = update,
          .render   = render,
          .resize   = resize,
          .shutdown = shutdown});
  return 0;
}