class Locale < ApplicationRecord
  before_save :lock_tag_creation!, if: :will_generate_tag_names?
  after_save :generate_tag_names!, if: :needs_tag_names?

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

  enum :code, ja: 'ja', ain_kana: 'ain-Kana'

  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 lock_tag_creation!
    SharedResourceIdAllocator.lock_space!(Tag, 'tags')
  end

  def needs_tag_names?
    deprecated_at.nil? && (saved_change_to_code? || saved_change_to_deprecated_at?)
  end

  def generate_tag_names! = TagNameCompletion.for_locale!(self)
end