module Scrivito
module Backend

class ObjDataFromRest < ObjData
  def initialize(data)
    raise InternalError unless Hash === data
    @data = data
  end

  def raw_value_and_type_of(attribute_name)
    return [value_of_widget_pool, nil] if attribute_name == '_widget_pool'

    if attribute_data = @data[attribute_name]
      if attribute_name.starts_with?('_')
        [attribute_data, nil]
      else
        [attribute_data[1], attribute_data[0]]
      end
    else
      [nil, nil]
    end
  end

  def attribute_names
    @data.keys
  end

  def to_h
    @data
  end

  private

  def value_of_widget_pool
    if widget_pool = @data['_widget_pool']
      # using Hash#merge to "map" to a new Hash
      widget_pool.merge(widget_pool) do |id, raw_widget_data|
        self.class.new(raw_widget_data)
      end
    end
  end
end

end
end