Post_24.2.rb

class FindSantas

  def get_family_members(santa_list)
    list_length = santa_list.length 
    family_members = santa_list.group_by{|person| person.last }.values.select{|last_name| 
					  last_name.size >= list_length/2.0}
  end

  def assign_random_santa(santa_list, santa_shuffled)
    santa_list.each do |person|
      potential = santa_shuffled.select{ |potential_person| person.not_self(potential_person) }
      person.assigned_santa = potential [ rand ] unless potential.empty?
      santa_shuffled.delete(person.assigned_santa)
    end
  end
		
  def assign_correct_santa(random_list)
    random_list.each do |person|
      potential = random_list.select{ |other_person| person.swap_santa(person, other_person) }
      raise if potential.empty?
        other_person = potential [ rand ]
        to_swap = person.assigned_santa
        person.assigned_santa = other_person.assigned_santa
        other_person.assigned_santa = to_swap
      end
    end
  end