animal_cannon.rb

class Animal

  attr_accessor :name

  def self.named(name)
    self.new(name)
  end

  def initialize(name)
    self.name = name
  end

  def make_noise
    puts "#{name} says #{sound}"
  end

  def sound
    ""
  end

end

class Kitten < Animal

  def sound
    "meow!"
  end

end

class Human < Animal

  def sound
    "ouch!"
  end

end

class AnimalCannon

  attr_accessor :target, :ammunition

  def self.load(target: nil, ammunition: nil)
    self.new(target,ammunition)
  end

  def initialize(target,ammunition)
    @target = target
    @ammunition = ammunition
  end

  def fire
    puts "Cannon fires the #{ammunition.class.to_s.downcase} named #{ammunition.name}."
    ammunition.make_noise
    sleep 3
    target.make_noise
  end

end

pool_of_kittens = [
  Kitten.named("Bill"),
  Kitten.named("Bull"),
  Kitten.named("Findus"),
  Kitten.named("Pelle")
]

available_targets = [
  Human.named("Zeeraw"),
  Human.named("Cordite")
]

2.times do
  AnimalCannon.load(
    target: available_targets.sample,
    ammunition: pool_of_kittens.sample
  ).fire
end