module ActiveModel::Serializable

def self.included(base)
  base.extend Utils
end

def as_json(options={})
  instrument do
    if root = options.fetch(:root, json_key)
      hash = { root => serializable_object(options) }
      hash.merge!(serializable_data)
      hash
    else
      serializable_object(options)
    end
  end
end

def embedded_in_root_associations
  {}
end

def get_namespace
  modules = self.class.name.split('::')
  modules[0..-2].join('::') if modules.size > 1
end

def instrument(&block)
  payload = { serializer: self.class.name }
  ActiveSupport::Notifications.instrument(INSTRUMENTATION_KEY, payload, &block)
end

def namespace
  if module_name = get_namespace
    Serializer.serializers_cache.fetch_or_store(module_name) do
      Utils._const_get(module_name)
    end
  end
end

def serializable_data
  embedded_in_root_associations.tap do |hash|
    if respond_to?(:meta) && meta
      hash[meta_key] = meta
    end
  end
end

def serializable_object_with_notification(options={})
  instrument { serializable_object(options) }
end