# encoding: utf-8

I18n.load_path << File.join(
  File.dirname(__FILE__), "validations", "locale", "en.yml"
)

module CouchRest
  module Model

    # This applies to both Model::Base and Model::CastedModel
    module Dirty
      extend ActiveSupport::Concern
      include CouchRest::Model::CastedBy  # needed for base_doc
      include ActiveModel::Dirty

      included do
        # internal dirty setting - overrides global setting.
        # this is used to temporarily disable dirty tracking when setting 
        # attributes directly, for performance reasons.
        self.send(:attr_accessor, :disable_dirty)
      end

      def use_dirty?
        bdoc = base_doc
        bdoc && !bdoc.disable_dirty
      end

      def couchrest_attribute_will_change!(attr)
        return if attr.nil? || !use_dirty?
        attribute_will_change!(attr)
        couchrest_parent_will_change!
      end

      def couchrest_parent_will_change!
        @casted_by.couchrest_attribute_will_change!(casted_by_attribute) if @casted_by
      end

      private

      # return the attribute name this object is referenced by in the parent
      def casted_by_attribute
        return @casted_by_attribute if @casted_by_attribute
        attr = @casted_by.attributes
        @casted_by_attribute = attr.keys.detect { |k| attr[k] == self }
      end

    end
  end
end