Done

bin/tictactoe

@@ -1,3 +1,5 @@
 #!/usr/bin/env ruby
 
 require_relative '../config/environment'
+
+Game.new.start

lib/board.rb

@@ -0,0 +1,45 @@
+require 'pry'
+class Board
+  attr_accessor :cells
+
+  def initialize
+    @cells = Array.new(9, " ")
+  end
+
+  def reset!
+    initialize
+  end
+
+  def display 
+    puts " #{@cells[0]} | #{@cells[1]} | #{@cells[2]} "
+    puts "-----------"
+    puts " #{@cells[3]} | #{@cells[4]} | #{@cells[5]} "
+    puts "-----------"
+    puts " #{@cells[6]} | #{@cells[7]} | #{@cells[8]} "
+  end
+
+  def position(pos)
+    @cells[pos.to_i - 1]
+  end
+
+  def full?
+    @cells.none?(" ")
+  end
+
+  def turn_count 
+    9 - @cells.count(" ")
+  end
+
+  def taken?(pos)
+    position(pos) == " " ? false : true
+  end
+
+  def valid_move?(pos)
+    !taken?(pos) && pos.to_i.between?(1, 9)
+  end
+
+  def update(pos, token)
+    turn_count.even? ? token = "X" : token = "O"
+    @cells[pos.to_i - 1] = token if valid_move?(pos)
+  end
+end

lib/game.rb

@@ -0,0 +1,97 @@
+require 'pry'
+class Game
+  WIN_COMBINATIONS = [
+    [0,1,2], [3,4,5], [6,7,8],
+    [0,3,6], [1,4,7], [2,5,8],
+    [0,4,8], [2,4,6]
+    ]
+
+  attr_accessor :player_1, :player_2, :board
+
+  def initialize(player_1 = nil, player_2 = nil, board = nil)
+    player_1 == nil ? @player_1 = Players::Human.new("X") : @player_1 = player_1
+    player_2 == nil ? @player_2 = Players::Human.new("O") : @player_2 = player_2
+    board == nil ? @board = Board.new : @board = board
+  end
+
+  def current_player
+    @board.cells.count(" ").odd? ? @player_1 : @player_2
+  end
+
+  def won? 
+    WIN_COMBINATIONS.detect {|win| 
+      @board.cells[win[0]] == "X" && 
+      @board.cells[win[1]] == "X" && 
+      @board.cells[win[2]] == "X" ||
+      @board.cells[win[0]] == "O" && 
+      @board.cells[win[1]] == "O" && 
+      @board.cells[win[2]] == "O"
+      }
+  end
+
+  def draw?
+    won? == nil && @board.full?
+  end
+
+  def over? 
+    won? != nil || draw?
+  end
+
+  def winner 
+    won?.nil? ? nil : @board.cells[won?[0]]
+  end
+
+  def turn
+    valid = false
+    until valid == true
+      pos = current_player.move(@board)
+      valid = @board.valid_move?(pos)
+    end
+    @board.update(pos, current_player.token)
+  end
+
+  def play
+    until over?
+      turn
+      @board.display
+    end
+    if won? 
+      puts "Congratulations #{winner}!"
+    elsif draw?
+      puts "Cat's Game!"
+    end
+  end
+
+  def start
+    puts "Welcome to Tic-Tac-Toe!"
+    puts "Select a game:"
+    puts " - Make the computer play itself, click '0'."
+    puts " - Play versus the computer, click '1'."
+    puts " - Play against a friend, click '2'."
+    @game_type = gets.chomp.to_i
+    case @game_type 
+      when 0 #computer vs computer
+        @player_1 = Players::Computer.new("X")
+        @player_2 = Players::Computer.new("O")
+        play
+      when 1 #player vs computer
+        @player_1 = Players::Human.new("X")
+        @player_2 = Players::Computer.new("O")
+        play
+      when 2 #player vs player
+        puts "Great! Who wants to go first and be 'X'?"
+        play
+    end
+  end
+end
+
+
+
+
+
+
+
+
+
+
+

lib/player.rb

@@ -0,0 +1,9 @@
+class Player
+  attr_reader :token
+
+  @@board_pos = ["1", "2", "3", "4", "5", "6", "7", "8", "9"]
+
+  def initialize(token)
+    @token = token
+  end
+end

lib/players/computer.rb

@@ -0,0 +1,83 @@
+require 'pry'
+module Players 
+  class Computer < Player
+    def move(board)
+      puts "Computer: Select a number 1-9."
+      if board.cells.count(" ") == 9
+          @@board_pos.delete(@@board_pos.sample)
+      #center    
+        elsif board.cells[4] == " "
+          @@board_pos.delete("5") #center
+        elsif board.cells[4] == "X"
+          @@board_pos.delete("8") #bottom-center, counter to X in center position
+      #top-center
+        elsif board.cells[4] == "X" && board.cells[7] == "X" && board.cells[1] == " " ||
+          board.cells[0] == "X" && board.cells[2] == "X" && board.cells[1] == " " ||
+          board.cells[4] == "O" && board.cells[7] == "O" && board.cells[1] == " " ||
+          board.cells[0] == "O" && board.cells[2] == "O" && board.cells[1] == " "
+            @@board_pos.delete("2") #top-center
+      #left-center    
+        elsif board.cells[4] == "X" && board.cells[5] == "X" && board.cells[3] == " " ||
+          board.cells[0] == "X" && board.cells[6] == "X" && board.cells[3] == " " ||
+          board.cells[4] == "O" && board.cells[5] == "O" && board.cells[3] == " " ||
+          board.cells[0] == "O" && board.cells[6] == "O" && board.cells[3] == " "
+            @@board_pos.delete("4") #left-center
+      #right-center
+        elsif board.cells[4] == "X" && board.cells[3] == "X" && board.cells[5] == " " ||
+          board.cells[2] == "X" && board.cells[5] == "X" && board.cells[5] == " " ||
+          board.cells[4] == "O" && board.cells[3] == "O" && board.cells[5] == " " ||
+          board.cells[2] == "O" && board.cells[5] == "O" && board.cells[5] == " "
+            @@board_pos.delete("6") #right-
+      #bottom-center
+        elsif board.cells[4] == "X" && board.cells[1] == "X" && board.cells[7] == " " ||
+          board.cells[6] == "X" && board.cells[8] == "X" && board.cells[7] == " " ||
+          board.cells[4] == "O" && board.cells[1] == "O" && board.cells[7] == " " ||
+          board.cells[6] == "O" && board.cells[8] == "O" && board.cells[7] == " "
+            @@board_pos.delete("8") #bottom-center
+      #top-left
+        elsif board.cells[1] == "X" && board.cells[2] == "X" && board.cells[0] == " " ||
+          board.cells[3] == "X" && board.cells[6] == "X" && board.cells[0] == " " || 
+          board.cells[4] == "X" && board.cells[8] == "X" && board.cells[0] == " " ||
+          board.cells[1] == "X" && board.cells[3] == "X" && board.cells[0] == " " ||        
+          board.cells[1] == "O" && board.cells[2] == "O" && board.cells[0] == " " ||
+          board.cells[3] == "O" && board.cells[6] == "O" && board.cells[0] == " " || 
+          board.cells[4] == "O" && board.cells[8] == "O" && board.cells[0] == " " ||
+          board.cells[1] == "X" && board.cells[3] == "X" && board.cells[0] == " "
+            @@board_pos.delete("1") #top-left
+      #top-right
+        elsif board.cells[0] == "X" && board.cells[1] == "X" && board.cells[2] == " " || 
+          board.cells[5] == "X" && board.cells[8] == "X" && board.cells[2] == " " || 
+          board.cells[4] == "X" && board.cells[6] == "X" && board.cells[2] == " " || 
+          board.cells[1] == "X" && board.cells[5] == "X" && board.cells[2] == " " ||
+          board.cells[0] == "O" && board.cells[1] == "O" && board.cells[2] == " " || 
+          board.cells[5] == "O" && board.cells[8] == "O" && board.cells[2] == " " || 
+          board.cells[4] == "O" && board.cells[6] == "O" && board.cells[2] == " " ||
+          board.cells[1] == "O" && board.cells[5] == "O" && board.cells[2] == " "
+            @@board_pos.delete("3") #top-right
+      #bottom-left
+        elsif board.cells[7] == "X" && board.cells[8] == "X" && board.cells[6] == " " || 
+          board.cells[0] == "X" && board.cells[3] == "X" && board.cells[6] == " " || 
+          board.cells[2] == "X" && board.cells[4] == "X" && board.cells[6] == " " ||
+          board.cells[3] == "X" && board.cells[7] == "X" && board.cells[6] == " " ||          
+          board.cells[7] == "O" && board.cells[8] == "O" && board.cells[6] == " " || 
+          board.cells[0] == "O" && board.cells[3] == "O" && board.cells[6] == " " || 
+          board.cells[2] == "O" && board.cells[4] == "O" && board.cells[6] == " " ||
+          board.cells[3] == "O" && board.cells[7] == "O" && board.cells[6] == " "
+          @@board_pos.delete("7") #bottom-left
+      #bottom-right
+        elsif board.cells[6] == "X" && board.cells[7] == "X" && board.cells[8] == " " || 
+          board.cells[2] == "X" && board.cells[5] == "X" && board.cells[8] == " " || 
+          board.cells[0] == "X" && board.cells[4] == "X" && board.cells[8] == " " ||
+          board.cells[5] == "X" && board.cells[7] == "X" && board.cells[8] == " " ||
+          board.cells[6] == "O" && board.cells[7] == "O" && board.cells[8] == " " || 
+          board.cells[2] == "O" && board.cells[5] == "O" && board.cells[8] == " " || 
+          board.cells[0] == "O" && board.cells[4] == "O" && board.cells[8] == " " ||
+          board.cells[5] == "O" && board.cells[7] == "O" && board.cells[8] == " "
+          @@board_pos.delete("9") #bottom-right
+      #random
+        else
+          @@board_pos.delete(@@board_pos.sample)
+      end
+    end
+  end
+end

lib/players/human.rb

@@ -0,0 +1,11 @@
+require 'pry'
+module Players
+  class Human < Player 
+    def move(board)
+      puts "Select a number 1-9."
+      pos = gets.chomp
+      @@board_pos.delete(pos)
+      pos
+    end
+  end
+end

spec/02_player_spec.rb

@@ -18,4 +18,4 @@
       expect(player).to_not respond_to(:token=)
     end
   end
-end
+end

spec/03_human_player_spec.rb

@@ -15,4 +15,4 @@
       expect(human.move(Board.new)).to eq("1")
     end
   end
-end
+end

spec/04_game_spec.rb

@@ -348,4 +348,4 @@
 
   describe 'start' do
   end
-end
+end

spec/05_computer_player_spec.rb

@@ -17,4 +17,4 @@
       expect(valid_moves).to include(computer_move)
     end
   end
-end
+end