3scale/porta

# frozen_string_literal: true

module SystemName

  extend ActiveSupport::Concern

  included do
    before_validation :generate_system_name, on: :create
    class_attribute :_system_human_name
  end

  module ClassMethods

    def validates_system_name(opts = {})
      validates :system_name, presence: true, format: { with: %r{\A\w[\w\-/_]+\z}, allow_nil: true }

      return unless opts[:uniqueness_scope]

      validates :system_name, uniqueness: opts[:uniqueness_scope] == true ? { case_sensitive: true } : { case_sensitive: true, scope: opts[:uniqueness_scope] }
    end

    def has_system_name(opts = {})
      attr_protected :system_name if opts.delete(:protected)
      self._system_human_name = opts.delete(:human_name) || :name
      validates_system_name(opts)
    end
  end

  protected

  def system_human_name
    send(_system_human_name)
  end

  # Generates system_name from 'system_human_name'
  def generate_system_name
    generate_system_name! if system_name.blank?
  end

  def generate_system_name!
    if system_human_name.present?
      slug = system_human_name.parameterize.underscore
      self.system_name = slug.presence || internal_system_name
    else
      # TODO: remove this branch when Feature#name validation is added
      # and this ticket resolved https://github.com/3scale/system/issues/908
      # See: https://issues.redhat.com/browse/THREESCALE-4179
      if is_a?(Feature)
        msg = "Deprecated API with missing feature name probably called."
        Rails.logger.warn msg
      end

      self.system_name = internal_system_name
    end
  end

  # This method is used when we need to generate a system_name
  # but there is no suitable 'name' (human_name) from which
  # we can guess a reasonable one.
  #
  def internal_system_name
    model_name = ActiveModel::Name.new(self.class, self.class.module_parent)
    "#{model_name.param_key}_#{SecureRandom.hex(6)}"
  end
end