#include <SDL2/SDL.h>
#include <emscripten.h>
#include <emscripten/bind.h>
#include <iostream>
#include <lvgl/lvgl.h>
#include <stdlib.h>
#include <unistd.h>

using namespace emscripten;

void setCanvasSize(int width, int height) {
    std::cout << "canvas size: " << width << "*" << height << std::endl;
}

EMSCRIPTEN_BINDINGS(lvglapp) {
    function("setCanvasSize", &setCanvasSize);
}

int monitor_hor_res, monitor_ver_res;
static void hal_init(void);

extern "C" {
void lv_demo_widgets(void);
void do_loop();
}

int main(int argc, char **argv) {
    monitor_hor_res = atoi(argv[1]);
    monitor_ver_res = atoi(argv[2]);
    printf("Starting with screen resolution of %dx%d px\n", monitor_hor_res, monitor_ver_res);

    lv_init();
    hal_init();

    lv_demo_widgets();

    emscripten_set_main_loop(do_loop, -1, true);
    return 0;
}

void do_loop() {
    /* Periodically call the lv_task handler.
     * It could be done in a timer interrupt or an OS task too.*/
    lv_task_handler();
}

static void hal_init(void) {
    lv_display_t *disp = lv_sdl_window_create(monitor_hor_res, monitor_ver_res);
    lv_sdl_window_set_resizeable(disp, true);
    lv_group_t *g = lv_group_create();
    lv_group_set_default(g);

    lv_sdl_mouse_create();
    lv_sdl_mousewheel_create();
    lv_sdl_keyboard_create();

    lv_indev_t *mouse = lv_sdl_mouse_create();
    lv_indev_set_group(mouse, lv_group_get_default());

    lv_indev_t *mousewheel = lv_sdl_mousewheel_create();
    lv_indev_set_group(mousewheel, lv_group_get_default());

    lv_indev_t *keyboard = lv_sdl_keyboard_create();
    lv_indev_set_group(keyboard, lv_group_get_default());
}