monty-hall.rb

class MontyHall

  attr_accessor :choice_index, :doors, :choice
  attr_reader :switch_opt

  @@win_count = 0
  @@loss_count = 0

  def initialize(switch_opt)
    @doors = ["Car", "Goat", "Goat"].shuffle
    @switch_opt = switch_opt
  end

  def self.win_count
    @@win_count
  end

  def self.reset_win_and_loss_counts
    @@win_count = 0
    @@loss_count = 0
  end

  def self.loss_count
    @@loss_count
  end

  def run
    make_choice
    host_choice
    result
  end

  def make_choice
    # puts self.doors.inspect
    # puts "Which door? (0, 1, 2): "
    # self.choice_index = gets.chomp.to_i
    self.choice_index = 0
    self.choice = self.doors[choice_index]
    self.doors.delete_at(self.choice_index)
    self.doors.insert(self.choice_index, 0)
  end

  def host_choice
    @host_choice = self.doors.find do |door|
      door == "Goat"
    end
    @host_choice_index = self.doors.index(@host_choice)
    # switch?
    switch if self.switch_opt == true 
    self.doors.delete_at(@host_choice_index)
    self.doors.insert(@host_choice_index, 0)
  end

  def switch?
    puts self.doors.inspect
    puts "Behind door #{@host_choice_index} is a goat. Wanna swap with the last door?"
    input = gets.chomp
    if input == 'y'
      self.choice = self.doors.find do |door|
        door != 0
      end
    end
  end

  def switch
    self.choice = self.doors.find do |door|
      door != 0
    end
  end

  def result
    #puts self.doors.inspect
    if self.choice == "Car"
      @@win_count += 1
      #puts "Winner!"
    else
      @@loss_count += 1
      #puts "Loser!"
    end
  end
end

MontyHall.reset_win_and_loss_counts
1000000.times do
  MontyHall.new(true).run
end

puts "With Switching"
puts "Wins: #{MontyHall.win_count}"
puts "Losses: #{MontyHall.loss_count}"
puts "Win/Loss Percentage: #{(MontyHall.win_count.to_f/(MontyHall.win_count.to_f + MontyHall.loss_count.to_f)).round(2)*100}"

MontyHall.reset_win_and_loss_counts
1000000.times do
  MontyHall.new(false).run
end
puts ""
puts "Without Switching"
puts "Wins: #{MontyHall.win_count}"
puts "Losses: #{MontyHall.loss_count}"
puts "Win/Loss Percentage: #{(MontyHall.win_count.to_f/(MontyHall.win_count.to_f + MontyHall.loss_count.to_f)).round(2)*100}"