($action, $callback = false)
    {
        $prefix = $this->config->get('app.hook_prefix');
        
        return has_filter($prefix.$action, $callback);
    }

    /**
     * Register a short code
     * @param string $action
     * @param null
     */
    public function addShortcode($action, $handler)
    {
        return add_shortcode(
            $action, $this->parseHookHandler($handler)
        );
    }

    /**
     * Execute a shortcode
     * @param  mixed $content
     * @param  boolean $ignore_html
     * @return mixed
     */
    public function doShortcode($content, $ignore_html = false)
    {
        return do_shortcode($content, $ignore_html);
    }

    /**
     * Parse a hookm handler
     * @param  mixed $handler
     * @return mixed
     */
    public function parseHookHandler($handler)
    {
        if (is_string($handler)) {

            if (function_exists($handler)) return $handler;
            
            if (count($array = preg_split('/::|@/', $handler)) < 2) {
                $array[] = 'handle';
            }

            list($class, $method) = $array;

            $class = $this->makeInstance($class);

            return is_callable($class) ? $class : [$class, $method];

        } else if (is_array($handler)) {
            list($class, $method) = $handler;
            if (is_string($class)) {
                $class = $this->makeInstance($class);
            }
            return [$class, $method];
        }

        return $handler;
    }

    /**
     * Chdeck if handler has fqn
     * @param  string|Closure $handler
     * @return boolean
     */
    public function hasNamespace($handler)
    {
        if ($handler instanceof \Closure) {
            return false;
        };
        
        $parts = array_filter(explode('\\', $handler));
        
        return count($parts) > 1;
    }

    /**
     * Resolve the namespace for a controller
     * @param  string $handler
     * @return mixed
     */
    public function getControllerNamespace($handler)
    {
        if ($this->hasNamespace($handler)) {
            return '';
        }

        return $this->controllerNamespace;
    }

    /**
     * Resolve the namespace for a policy
     * @param  string $handler
     * @return mixed
     */
    public function getPolicyNamespace($handler)
    {
        if ($this->hasNamespace($handler)) {
            return '';
        }

        return $this->policyNamespace;
    }

    /**
     * Make an instance by the container
     * @param  string $class
     * @return mixed
     */
    public function makeInstance($class)
    {
        if ($this->hasNamespace($class)) {
            $instance = $this->make($class);
        } else {
            $instance = $this->make($this->handlerNamespace . '\\' . $class);
        }

        return $instance;
    }

    /**
     * Retrieve the base url
     * @param  string $url
     * @return string
     */
    public function url($url = '')
    {
        return $this->baseUrl.ltrim($url, '/');
    }

    /**
     * Add ajax action
     * @param string $action
     * @param string|Clousure $handler
     * @param int $priority
     * @param string $scope
     */
    private function addAjaxAction($action, $handler, $priority, $scope)
    {
        if ($scope == 'admin') {
            return add_action(
                'wp_ajax_'.$action,
                $this->parseHookHandler($handler),
                $priority
            );
        }

        if ($scope == 'public') {
            return add_action(
                'wp_ajax_nopriv_'.$action,
                $this->parseHookHandler($handler),
                $priority
            );
        }
    }

    /**
     * Add ajax actions including non_prive
     * @param string $action
     * @param string|Clousure $handler
     * @param int $priority
     */
    public function addAjaxActions($action, $handler, $priority = 10)
    {
        $this->addAjaxAction($action, $handler, $priority, 'admin');
        $this->addAjaxAction($action, $handler, $priority, 'public');
    }

    /**
     * Add ajax action for privilaged user
     * @param string $action
     * @param string|Clousure $handler
     * @param int $priority
     */
    public function addAdminAjaxAction($action, $handler, $priority = 10)
    {
        return $this->addAjaxAction($action, $handler, $priority, 'admin');
    }

    /**
     * Add ajax action for non-privilaged user
     * @param string $action
     * @param string|Clousure $handler
     * @param int $priority
     */
    public function addPublicAjaxAction($action, $handler, $priority = 10)
    {
        return $this->addAjaxAction($action, $handler, $priority, 'public');
    }
}