Get updated data from wp_insert_post - wordpress

Question

i have problem with managing advanced custom fields (i have 4 of them). I want to check if some of them are empty when i add new post. I tried something like empty($_POST['name_of_post_meta']) but it does not work.
How can i catch
function wpse120996_add_custom_field_automatically($post_id)
{
global $wpdb;
if (!wp_is_post_revision($post_id)) {
$category = get_the_category($post_id);
$category = $category[0]->name;
$link = get_permalink($post_id);
if (($_POST['post_status'] == 'publish') && ($_POST['original_post_status'] != 'publish')) { // new post
$lector = get_post_meta($post_id, 'lektor_pl', true);
$subs_pl = get_post_meta($post_id, 'napisy_pl', true);
$orginal = get_post_meta($post_id, 'wersja_eng', true);
$subs_eng = get_post_meta($post_id, 'subs_eng', true);
if (empty($_POST['lektor_pl'])) {
$lector = 0;
}
if (empty($_POST['napisy_pl'])) {
$subs_pl = 0;
}
if (empty($_POST['wersja_eng'])) {
$orginal = 0;
}
if (empty($_POST['subs_eng'])) {
$subs_eng = 0;
}
if (!empty($_POST['lektor_pl'])) {
$lector = 1;
}
if (!empty($_POST['napisy_pl'])) {
$subs_pl = 1;
}
if (!empty($_POST['wersja_eng'])) {
$orginal = 1;
}
if (!empty($_POST['subs_eng'])) {
$subs_eng = 1;
}
$sql = $wpdb->prepare("INSERT INTO `wp_cron_notification` (`id`, `post_id`, `subb_pl` , `lector`, `subb_eng`, `orginal`,`link`, `category`) values (NULL, %s, %s, %s, %s, %s, %s, %s)", $post_id, $subs_pl, $lector, $subs_eng, $orginal, $link, $category);
$wpdb->query($sql) or die("ERROR #3");
}
}
}
add_action('wp_insert_post', 'wpse120996_add_custom_field_automatically', 1);
Thanks in advance for any help.

Answer 1

You can make use here of the ACF save_post function (http://www.advancedcustomfields.com/resources/acfsave_post/) which fires just after a post is saved. See more here:
If you put the following in your functions.php file you should be able to access the newly saved post and carry out code above. For example:
add_action('acf/save_post', 'post_save_update_title', 20);
function post_save_update_title($post_id){
//Your code here
}