tarynsauer

  def alphabeta(board, player, depth, alpha, beta)
    board.open_cells.each_key do |cell|
      board.add_marker(player.opponent.marker, cell)
      score = (apply_minimax(board, player.opponent, cell, depth += 1, alpha, beta) / depth.to_f)
      alpha = player.get_alpha(alpha, score)
      beta = player.get_beta(beta, score)
      board.remove_marker(cell)
      break if alpha >= beta
    end
    player.return_value(alpha, beta)

tarynsauer

class Minimizing < Player
  attr_accessor :marker, :turn, :opponent
  def initialize(player)
    @marker      = player.marker
    @turn        = player.turn
    @opponent    = player.opponent
  end

  def get_alpha(alpha, score)
    score > alpha ? score : alpha

tarynsauer

def apply_minimax(board, player, cell, depth, alpha, beta)
    return get_score(board, player) if board.game_over?
    if player.current_player?
      maximizing_player = Maximizing.new(player)
      alphabeta(board, maximizing_player, depth, alpha, beta)
    else
      minimizing_player = Minimizing.new(player)
      alphabeta(board, minimizing_player, depth, alpha, beta)
    end
  end

tarynsauer

Gem::Specification.new do |s|
  s.name        = 'ruby_ttt'
  s.version     = '0.0.2'
  s.summary     = "Tic-tac-toe game with computer player AI option."
  s.description = "A tic-tac-toe game with human vs. human, human vs. computer, and computer vs. computer options. When 'hard' level is selected, the computer is unbeatable and the AI uses the minimax algorithm."
  s.authors     = ["Taryn Sauer"]
  s.email       = '[email protected]'
  s.homepage    = 'http://rubygems.org/gems/ruby_ttt'

  s.add_development_dependency "rspec"

tarynsauer

helpers do

  def start_game(player_one_type, player_two_type)
    setup = new_game_setup
    setup.set_opponents
    setup.who_goes_first
    setup.player_one.player_type = player_one_type
    setup.player_two.player_type = player_two_type
    set_sessions(setup.board, setup.player_one, setup.player_two)
  end

tarynsauer

class WebUI < UI

  def print_active_board
    board_string = ''
    board.all_rows.each do |row|
      board_string += "<div class='row'>"
      row.each { |cell| board_string += "<button name='move' value='#{cell}'> #{board.all_cells[cell]} <span class='cell'>.</span></button>" }
      board_string += "</div>"
    end
    board_string

tarynsauer

class Game

  def verify_move(cell)
    board.add_marker(current_player.marker, cell) if board.available_cell?(cell)
  end

  def get_game_message
    board.empty? ? ui.first_move_message(current_player) : ui.next_move_message(current_player)
  end

tarynsauer

# GET ------------------------------
get '/' do
  session.clear
  erb :index
end

get '/play' do
  @board = session[:game].board
  @message = @board.empty? ? session[:setup].who_goes_first : session[:game].game_status_check
  if [email protected]_over?

tarynsauer

class CLIGame < Game
  attr_accessor :ui

  def initialize(board, player_one, player_two)
    super
    @ui = CLIUI.new(board)
  end

  def start_cli_game!
    begin

tarynsauer

class Game
  attr_accessor :board, :player_one, :player_two, :ui, :player_first_move
  def initialize(settings)
    @board = settings[:board]
    @player_one = settings[:player_one]
    @player_two = settings[:player_two]
    @player_first_move = settings[:player_first_move]
    @ui = UI.new
  end