module RailsConnector

# The CMS widget class
# @api public
class BasicWidget
  include AttributeContent

  def self.type_computer
    @_type_computer ||= TypeComputer.new(RailsConnector::BasicWidget, ::Widget)
  end

  def self.reset_type_computer!
    @_type_computer = nil
  end

  attr_accessor :id, :obj, :container, :container_field_name

  alias_method :initialize, :update_data

  delegate :widget_from_pool, to: :obj

  def obj_class
    data_from_cms.value_of('_obj_class')
  end

  def ==(other)
    other.respond_to?(:obj) && obj == other.obj && other.respond_to?(:id) && id == other.id
  end

  def eql?(other)
    self == other
  end

  # Reverts content changes of this widget. Widget attributes of this widget are not effected.
  # After calling this method it's as if this widget has been never modified in the current working copy.
  # This method does not work with +new+ or +deleted+ widgets.
  # This method also does also not work for the +published+ workspace or the +rtc+ working copy.
  def revert
    Workspace.current.raise_if_reverting_objs_impossible

    previous_obj_content =
        CmsRestApi.get("revisions/#{Workspace.current.base_revision_id}/objs/#{obj.id}")

    if previous_widget_content = previous_obj_content["_widget_pool"]["#{id}"]
      previous_widget_content.delete_if do |attribute_name, _|
        type_of_attribute(attribute_name) == "widget"
      end
      CmsRestApi.put("workspaces/#{Workspace.current.id}/objs/#{obj.id}",
          { obj: {_widget_pool: {id => previous_widget_content}} })
    else
      raise "cannot revert changes, since widget is new."
    end
  end

  def hash
    (id + obj.id).hash
  end

  # returns the entity ({BasicObj} or {BasicWidget}) that references this widget
  # @api public
  def container
    @container || cache_container_and_field_name_for_widget.first
  end

  # returns the name of the widget field that references this widget
  # @api public
  def container_field_name
    @container_field_name || cache_container_and_field_name_for_widget.second
  end

  private

  def cache_container_and_field_name_for_widget
    @cache_container_and_field_name_for_widget ||= obj.container_and_field_name_for_widget(id)
  end
end

end