gistfile2.txt

$ruby roullette.rb
0
Charlie bet $10 on 13.
He rolled a 29.
His payout is $0.

roulette.rb

require 'httparty'

class Roulette
  include HTTParty
  base_uri 'roulette.engineyard.com/'
  default_timeout 3

  attr_accessor :amount, :numbers
  def self.bet(amount)
    new.bet(amount)
  end

  def bet(amount)
    @amount = amount
    self
  end

  def on(*numbers)
    @numbers = numbers
    self
  end

  def payout
    winner? ? (36 - bets_placed)/bets_placed * @amount  : 0
  end

  def bets_placed
    @numbers.count
  end

  def winner?
    @numbers.include? roll
  end

  def roll
    @roll ||= get['winning_number'].to_i
  end

  def get
    self.class.get('').parsed_response
  end

  def results
    "Charlie bet $#{amount} on #{numbers.join(', ')}.\n" <<
    "He rolled a #{roll}.\n" <<
    "His payout is $#{payout}."
  end

end


puts Roulette.bet(10).on(13).payout
puts Roulette.bet(10).on(13).results