module Translatable
  extend ActiveSupport::Concern

  included do
    accepts_nested_attributes_for :translations, :reject_if => :empty_translation_in_params?
  end

  def find_translation_by_locale(locale)
    translations.find_by_locale(locale)
  end

  def translated_versions
    translations
  end

  def ordered_translations
    translations.select do |translation|
      I18n.available_locales.include?(translation.locale)
    end.sort_by do |translation|
      I18n.available_locales.index(translation.locale)
    end
  end

  def build_all_translations
    I18n.available_locales.each do |locale|
      if translations.none? { |translation| translation.locale == locale }
        translations.build(:locale => locale)
      end
    end
  end

  def translated_versions=(translation_attrs)
      warn "[DEPRECATION] #{self.class.name}#translated_versions= will be replaced " \
           "by #{self.class.name}#translations_attributes= as of release 0.22"
      self.translations_attributes = translation_attrs
  end

  private

  def empty_translation_in_params?(attributes)
    attributes.select { |k, v| v.present? && k.to_s != 'locale' }.empty?
  end
end