P5: OO Inheritance.rb

class Vehicle
  attr_reader :color
  def initialize(attributes)
    @color = attributes[:color]
    @wheels = attributes[:wheels]
    @engine_status = :off
  end

  def drive
    @stutus = :driving
  end

  def brake
    @status = :stopped
  end

  def is_on?
    if @engine_status == :on
      return true
    else
      return false
    end
  end

  def turn_on
    @engine_status = :on   
  end

  def turn_off
    @engine_status = :off
  end
end


class Car < Vehicle
  def initialize(attributes = {})
    super(attributes)
  end
  
  def needs_gas?
    return [true,true,false].sample
  end

  def drive_slow
    @status = :driving_super_slow
  end
end


class Bus < Vehicle
  attr_reader :passengers
  def initialize(attributes = {})
    super(attributes)
    @num_seats = attributes[:num_seats]
    @fare = attributes[:fare]
    @passengers=[]
  end

  def drive
    return self.brake if stop_requested?
    super
  end
 
  def admit_passenger(passenger,money)
    @passengers << passenger if money > @fare
  end
  
  def stop_requested?
    return [true,false].sample
  end
  
  def needs_gas?
    return [true,true,true,false].sample
  end
end


class Motorbike < Vehicle
  def initialize(attributes = {})
    super(attributes)
  end

  def drive
    super
    @speed = :fast
  end
 
  def needs_gas?
    return [true,false,false,false].sample
  end

  def weave_through_traffic
    @status = :driving_like_a_crazy_person
  end
end




test = Vehicle.new({:color => "red"})
p test.color == "red"

ducati = Motorbike.new({:color => "yellow", :wheels => 2})
megabus = Bus.new({:color => "green", :wheels => 6, :num_seats => 125, :fare => 125.00})
ford = Car.new({:color => "red", :wheels => 4})


p ducati.drive == :fast
p ducati.brake == :stopped
p ducati.weave_through_traffic == :driving_like_a_crazy_person
p ford.drive == :driving
p ford.brake == :stopped
p ford.needs_gas? == false || true
p megabus.brake == :stopped
p megabus.admit_passenger("Ryan", 150) == megabus.passengers
p megabus.admit_passenger("Katie", 150) == megabus.passengers
p megabus.stop_requested? == false || true
p megabus.brake == :stopped
p ducati.is_on? == false
p ducati.turn_on == :on
p ducati.is_on? == true
p ford.is_on? == false