module Scrivito

module ClientAttributeSerializer
  def self.serialize_obj(obj)
    serialized_output = {}

    # system attributes
    serialized_output.merge!(serialize_system_attrs(obj))

    # custom attributes
    serialized_output.merge!(serialize_custom_attrs(obj))

    # _widget_pool
    serialized_output.merge!(serialize_widget_pool(obj.widgets))

    serialized_output
  end

  def self.serialize_system_attrs(obj)
    {
      '_id'        => obj.id,
      '_obj_class' => obj.obj_class_name,
      '_path'      => obj.path,
      '_permalink' => obj.permalink,
    }
  end

  def self.serialize_custom_attrs(obj_or_widget)
    Hash[
      obj_or_widget.attribute_definitions.map do |definition|
        name = definition.name
        type = definition.type
        value = obj_or_widget[name]

        [name, serialize_custom_attr_value(type, value)]
      end
    ]
  end

  def self.serialize_widget_pool(widgets)
    {
      '_widget_pool' => Hash[
        widgets.map do |widget|
          [widget.id, serialize_widget(widget)]
        end
      ]
    }
  end

  def self.serialize_custom_attr_value(type, value)
    return unless value

    case type
    when 'binary'        then serialize_binary_value(value)
    when 'date'          then serialize_date_value(value)
    when 'enum'          then serialize_enum_value(value)
    when 'html'          then serialize_html_value(value)
    when 'link'          then serialize_link_value(value)
    when 'linklist'      then serialize_linklist_value(value)
    when 'multienum'     then serialize_multienum_value(value)
    when 'reference'     then serialize_reference_value(value)
    when 'referencelist' then serialize_referencelist_value(value)
    when 'string'        then serialize_string_value(value)
    when 'stringlist'    then serialize_stringlist_value(value)
    when 'widgetlist'    then serialize_widgetlist_value(value)
    end
  end

  def self.serialize_binary_value(value)
    {'url' => value.url, 'filename' => value.filename}
  end

  def self.serialize_date_value(value)
    DateAttribute.serialize_for_client(value)
  end

  def self.serialize_enum_value(value)
    value
  end

  def self.serialize_html_value(value)
    value
  end

  def self.serialize_link_value(value)
    value.to_cms_api_linklist_params.stringify_keys
  end

  def self.serialize_linklist_value(value)
    value.map do |link|
      serialize_link_value(link)
    end
  end

  def self.serialize_multienum_value(value)
    value.map do |enum|
      serialize_enum_value(enum)
    end
  end

  def self.serialize_reference_value(value)
    value.id
  end

  def self.serialize_referencelist_value(value)
    value.map do |reference|
      serialize_reference_value(reference)
    end
  end

  def self.serialize_string_value(value)
    value
  end

  def self.serialize_stringlist_value(value)
    value.map do |string|
      serialize_string_value(string)
    end
  end

  def self.serialize_widgetlist_value(value)
    value.map do |widget|
      widget.id
    end
  end

  def self.serialize_widget(widget)
    {
      '_obj_class' => widget.obj_class_name
    }.merge(serialize_custom_attrs(widget))
  end
end

end