vehicle.rb

class Vehicle

  def powerplant(args)
    @engine
    @transmission
    @drivetrain
  end

  def chassis(args)
    @suspension
    @orientation
    
  end

  def drive
    @status = :driving
  end

  def speed
    if @status == :driving 
      @speed = :fast
    else 
      @status = :slow
    end
  end

  def brake
    @status = :stopped    
  end

  def needs_gas?
    return [true,true,false].sample
  end

end

class Car < Vehicle
  @@WHEELS = 4
  
  def initialize(args)
    @color = args[:color]
    @wheels = @@WHEELS
  end

end


class Bus < Vehicle
  attr_reader :passengers
  def initialize(args)
    @color = args[:color]
    @wheels = args[:wheels]
    @num_seats = args[:num_seats]
    @fare = args[:fare]
    @passengers=[]
  end
  
  def drive
    return self.brake if stop_requested?
    @status = :driving
  end
  
  def admit_passenger(passenger,money)
    money > @fare ? @passengers << passenger : "get off the bus!"
  end

  def stop_requested?
    return [true,false].sample
  end

end

class Motorbike < Vehicle
  @@WHEELS = 2
  def initialize(args)
    @color = args[:color]
    @wheels = @@WHEELS

  end

  def weave_through_traffic
    @status = :driving_like_a_crazy_person
  end
end

########### "Driver" Code Below ############################################

bus_args = {:color => "yellow", :wheels => 6, :num_seats => 25, :fare => 2}
other_bus_args = {color: "silver", wheels: 8, num_seats: 30, fare: 2}
tesla_args = {color: "blue"}


school = Bus.new(bus_args)


p school

p school.admit_passenger("Jake", 1)

ducati = Motorbike.new(:color => "red")

p ducati.weave_through_traffic

p school.stop_requested?

tesla = Car.new(tesla_args)

p tesla

p tesla.drive

p tesla.speed
p tesla.needs_gas?