module PeopleHelper
  # Show someone's birthday in human-readable form,
  # plus their current age.
  # 
  # Example output: "10th October 1975 (age 31)"
  def show_birthday(bday)
    if bday.blank?
      out = nil
    else
      current_date = DateTime.now
      age = current_date.year - bday.year
      
      # If someone hasn't had their birthday yet this year,
      # we need to recalculate their age.
      closest_bday = Date.new(current_date.year, bday.month, bday.day)
      if closest_bday > current_date
        age -= 1
      end
      
      out = human_date(bday) + ' (age ' + age.to_s + ')'
    end
    
    out
  end
end