class Locale < ApplicationRecord
  attr_accessor :certified_tag_names_path

  around_save :save_with_tag_names!, if: :will_generate_tag_names?

  belongs_to :language, foreign_key: :language_code, primary_key: :code
  belongs_to :script, foreign_key: :script_code, primary_key: :code

  # Enum deserialisation uses the first key for each stored value.
  # Keep the legacy key for existing predicates, scopes and query arguments.
  enum :code, { ja: 'ja', 'ain-Kana' => 'ain-Kana', ain_kana: 'ain-Kana' }

  def code= value
    super(self.class.codes.fetch(value.to_s, value))
  end

  def self.nipponese = Locale.find('ja')

  private

  def will_generate_tag_names?
    deprecated_at.nil? && (will_save_change_to_code? || will_save_change_to_deprecated_at?)
  end

  def save_with_tag_names!
    completed = self.class.transaction(requires_new: true) do
      SharedResourceIdAllocator.lock_space!(Tag, 'tags')
      saved = yield
      raise ActiveRecord::RecordNotSaved, 'Locale save was halted' unless saved

      TagNameCompletion.for_locale!(self)
      true
    end
    unless completed
      raise ActiveRecord::RecordNotSaved, 'Locale tag completion was rolled back'
    end
  end
end