module AgeConcern

# File app/models/concerns/age_concern.rb, line 17
def age_months(now: nil)
  date_of_birth = __send__(self.class.date_of_birth_field_for_age)
  now ||= Time.current

  day_is_greater_or_equal = now.day >= date_of_birth.day

  (now.year - date_of_birth.year) * 12 + now.month - date_of_birth.month -
    (day_is_greater_or_equal ? 0 : 1)
end

# File app/models/concerns/age_concern.rb, line 27
def age_years(now: nil)
  date_of_birth = __send__(self.class.date_of_birth_field_for_age)
  now ||= Time.current

  month_is_greater = now.month > date_of_birth.month
  month_matches = now.month == date_of_birth.month
  day_is_greater_or_equal = now.day >= date_of_birth.day

  now.year - date_of_birth.year -
    (
      if month_is_greater || (month_matches && day_is_greater_or_equal)
        0
      else
        1
      end
    )
end

# File app/models/concerns/age_concern.rb, line 7
def date_of_birth_field_for_age(name = nil)
  @date_of_birth_field_for_age = name if name

  @date_of_birth_field_for_age
end