#include <stdio.h>
#include <string.h>

#include <wayland-client.h>

struct wl_compositor *compositor;
struct wl_shm *shm;
struct wl_shell *shell;

void registry_global_handler
(
    void *data,
    struct wl_registry *registry,
    uint32_t name,
    const char *interface,
    uint32_t version
) {
    if (strcmp(interface, "wl_compositor") == 0) {
        compositor = wl_registry_bind(registry, name,
            &wl_compositor_interface, 3);
    } else if (strcmp(interface, "wl_shm") == 0) {
        shm = wl_registry_bind(registry, name,
            &wl_shm_interface, 1);
    } else if (strcmp(interface, "wl_shell") == 0) {
        shell = wl_registry_bind(registry, name,
            &wl_shell_interface, 1);
    }
}

void registry_global_remove_handler
(
    void *data,
    struct wl_registry *registry,
    uint32_t name
) {}

const struct wl_registry_listener registry_listener = {
    .global = registry_global_handler,
    .global_remove = registry_global_remove_handler
};

int main(void)
{
    struct wl_display *display = wl_display_connect(NULL);
    struct wl_registry *registry = wl_display_get_registry(display);
    wl_registry_add_listener(registry, &registry_listener, NULL);

    // wait for the "initial" set of globals to appear
    wl_display_roundtrip(display);

    // all our objects should be ready!
    if (compositor && shm && shell) {
        printf("Got them all!\n");
    } else {
        printf("Some required globals unavailable\n");
        return 1;
    }

    while (1) {
        wl_display_dispatch(display);
    }
}