my_hanoi_game.rb

class Hanoi
  def initialize
    @disc = Array.new(3) {Array.new(1)}
    @disc[0] = (1..3).to_a.reverse
    choose_mode
    play
  end

  def choose_mode
    puts "Welcome to Hanoi! It starts with 3 discs, would you like to play more?\ny/n?"
    answer = gets.chomp.downcase
    case answer
     when "y"
       puts "How many discs would you like to to play with?   Enter a number > 3"
       number = gets.chomp.to_i
       @disc = Array.new(3) {Array.new(1)}
       @disc[0] = (1..number).to_a.reverse
     when "n" then @disc
    end
    display_game
  end

  def display_game
    p @disc
  end

  def ask_for_moves
    puts "Which pile do you want to move from? (Enter number between 1 ~ 3) "
    @start_pile = gets.chomp.to_i - 1
    puts "And which pile you like to move it to? (Enter number between 1 ~ 3)"
    @end_pile = gets.chomp.to_i - 1
  end

  def move_disc
    disc_to_move = @disc[@start_pile].pop
    if  @disc[@end_pile].last == nil || @disc[@end_pile].empty?
     @disc[@end_pile][0] = disc_to_move
    elsif disc_to_move < @disc[@end_pile].last
     @disc[@end_pile].push(disc_to_move)
    else
      @disc[@start_pile].push(disc_to_move)
      puts "You can't place a bigger disc on top of a smaller one   \nTry again!"
      puts "\n"
      display_game
      ask_for_moves
    end
    display_game
  end

  def play
    until win?
    ask_for_moves
    move_disc
    end
    puts "You Won! Play again?\ny/n?"
    play_again = gets.chomp.downcase
    case play_again
      when "y" then Hanoi.new
        when "n" then exit
    end
  end

  def win?
    @disc.first.empty? && @disc[1..2].any?(&:empty?)
  end
end
game = Hanoi.new