#include "konwinlib.h"
#include "konsofren.h"
#include "kontime.h"

#ifdef KON_MODULE_DEBUG
#include "konassets.h"
#include "konfont.h"
#include "kondebug.h"
#endif

#define GAME_WIDTH 320
#define GAME_HEIGHT 180

typedef struct app {
	kon_window_t *window;
	kon_display_t *display;
	kon_camera_t camera;
	kon_material_t material;
	kon_light_t light;
	kon_time last;
	float angle;
#ifdef KON_MODULE_DEBUG
	kon_assets_t *assets;
	kon_font_t *font;
	kon_debug_t *debug;
#endif
} app_t;

static void frame(void *data)
{
	app_t *app = (app_t *)data;
	kon_display_t *display = app->display;
	kon_event_t ev;
	kon_time now;
	kon_mat4_t model, viewProjection;

	while (kon_pollEvent(app->window, &ev)) {
#ifdef KON_MODULE_DEBUG
		if (kon_debugFeedEvent(app->debug, &ev)) continue;
#endif
		if (ev.type == KON_EVENT_RESIZE) {
			kon_resizeDisplay(display, ev.width, ev.height);
		}
		if (ev.type == KON_EVENT_KEY_DOWN && ev.key == KON_KEY_O) {
			app->camera.projection = (app->camera.projection == KON_PROJECTION_PERSPECTIVE)
				? KON_PROJECTION_ORTHOGRAPHIC : KON_PROJECTION_PERSPECTIVE;
		}
	}

	now = kon_getTime();
	app->angle += (float)(now - app->last);
	app->last = now;

	model = kon_mat4Identity();
	model = kon_mat4Rotate(model, KON_VEC3(app->angle * 0.5f, app->angle, 0));
	viewProjection = kon_cameraViewProjection(&app->camera, display->game->width, display->game->height);

	kon_clearFramebuffer(display->game, KON_BACKGROUND_COLOR);
	kon_drawMesh(display->game, viewProjection, model, &kon_cubeMesh, &app->material, &app->light, KON_RENDER_DEFAULT);

	kon_presentDisplay(display);
#ifdef KON_MODULE_DEBUG
	kon_debugFrame(app->debug);
	kon_debugDraw(app->debug, display->screen);
#endif
	kon_blitPixels(app->window, display->screen->data, display->screen->width, display->screen->height);
	kon_sleep(0.008);
}

int main(void)
{
	app_t app = {0};

	if (!kon_init()) return 1;

	app.window = kon_createWindow("engine", 0, 0, 800, 600, KON_WINDOW_CENTER | KON_WINDOW_RESIZABLE);
	if (!app.window) return 1;
#ifdef KON_DEVELOPER
	kon_setExitKey(app.window, KON_KEY_F10);
#else
	kon_setExitKey(app.window, KON_KEY_ESCAPE);
#endif

	app.display = kon_createDisplay(GAME_WIDTH, GAME_HEIGHT, 800, 600);
	if (!app.display) return 1;

	app.camera = kon_cameraDefault();
	app.camera.position = KON_VEC3(3, 3, 6);
	app.material = kon_materialColor(0xFFC8C8FF);
	app.light = kon_lightDefault();
	app.last = kon_getTime();

#ifdef KON_MODULE_DEBUG
	app.assets = kon_assetsCreate(NULL, "assets");
	{
		kon_blob_t *ttf = kon_assetBlob(app.assets, "font.ttf");

		if (ttf) app.font = kon_loadFont(ttf->data, ttf->size, 14.0f);
		app.debug = kon_debugCreate(app.font);
		kon_debugSetAssets(app.debug, app.assets);
		kon_debugLog(app.debug, ttf ? "loaded font.ttf" : "put a font.ttf in assets/ for the console");
	}
#endif

	kon_runMainLoop(app.window, frame, &app);

#ifdef KON_MODULE_DEBUG
	kon_debugDestroy(app.debug);
	kon_freeFont(app.font);
	kon_assetsDestroy(app.assets);
#endif

	kon_freeDisplay(app.display);
	kon_destroyWindow(app.window);
	kon_deinit();
	return 0;
}