booking.rb

class Booking
  attr_reader :nights, :minibar_items, :room

  def initialize nights, minibar_items, room
    @nights = nights
    @minibar_items = minibar_items
    @room = room
  end

  def calculate_total_cost
    "$#{calculate_room_charge + calculate_minibar_charges + calculate_parking_charges}"
  end

  def calculate_room_charge
    nights * room.room_charge
  end

  def calculate_minibar_charges
    minibar_items * room.minibar_charges
  end

  def calculate_parking_charges
    nights * room.parking_charges
  end
end

class Room
  def room_charge
    # handle error
  end

  def minibar_charges
    # handle error
  end

  def parking_charges
    # handle error
  end
end

class NormalRoom < Room
  def room_charge
    50
  end

  def minibar_charges
    5
  end

  def parking_charges
    5
  end
end

class SuiteRoom < Room
  def room_charge
    90
  end

  def minibar_charges
    3
  end

  def parking_charges
    2
  end
end

room = NormalRoom.new
puts Booking.new(3, 2, room).calculate_total_cost


room = SuiteRoom.new
puts Booking.new(3, 2, room).calculate_total_cost