Week8

week7/homework/features/step_definitions/tic-tac-toe-steps.rb

@@ -1,5 +1,8 @@
 require 'rspec/mocks/standalone'
 
+current_dir = File.expand_path(File.dirname(__FILE__))
+require "#{current_dir}/../../lib/tic_tac_toe.rb"
+
 Given /^I start a new Tic\-Tac\-Toe game$/ do
   @game = TicTacToe.new
 end
@@ -13,7 +16,7 @@
 end
 
 Then /^randomly chooses who goes first$/ do
-  [@game.player, "Computer"].should include @game.current_player
+  [@game.player, "Computer"].should include @game.current_player.name
 end
 
 Then /^who is X and who is O$/ do
@@ -26,7 +29,7 @@
 end
 
 Given /^it is my turn$/ do
-  @game.current_player.should eq "Renee"
+  @game.current_player.name.should eq "Renee"
 end
 
 Given /^the computer knows my name is Renee$/ do
@@ -35,7 +38,7 @@
 
 Then /^the computer prints "(.*?)"$/ do |arg1|
   @game.should_receive(:puts).with(arg1)
-  @game.indicate_palyer_turn
+  @game.indicate_player_turn
 end
 
 Then /^waits for my input of "(.*?)"$/ do |arg1|
@@ -45,7 +48,7 @@
 
 Given /^it is the computer's turn$/ do
   @game = TicTacToe.new(:computer, :O)
-  @game.current_player.should eq "Computer"
+  @game.current_player.name.should eq "Computer"
 end
 
 Then /^the computer randomly chooses an open position for its move$/ do
@@ -74,11 +77,11 @@
 end
 
 When /^"(.*?)" is not taken$/ do |arg1|
-  @old_pos.should eq " "
+  @old_pos.should eq nil
 end
 
 Then /^it is now the computer's turn$/ do
-  @game.current_player.should eq "Computer"
+  @game.current_player.name.should eq "Computer"
 end
 
 When /^there are three X's in a row$/ do
@@ -118,7 +121,7 @@
 end
 
 Then /^computer should ask me for another position "(.*?)"$/ do |arg1|
-  @game.board[arg1.to_sym] = ' '
+  @game.board[arg1.to_sym] = nil
   @game.should_receive(:get_player_move).twice.and_return(@taken_spot, arg1)
   @game.player_move.should eq arg1.to_sym
 end

week7/homework/lib/tic_tac_toe.rb

@@ -0,0 +1,209 @@
+require 'pry'
+
+class Player
+  attr_accessor :name, :symbol, :winner
+end
+
+
+class TicTacToe
+
+  SYMBOLS = [:X, :O]
+
+  attr_accessor :board
+
+  def initialize(first_player = nil, player_symbol = nil)
+    @computer_player = Player.new
+    @computer_player.name = "Computer"
+
+    @human_player = Player.new
+
+    @players = {:player => @human_player, :computer => @computer_player}
+
+    # player_order is an array like [:player, :computer]
+    if first_player
+      @player_order = []
+      player_names = @players.keys
+
+      @player_order << player_names.delete(first_player)
+      @player_order << player_names[0]
+    else
+      @player_order = @players.keys.shuffle
+    end
+
+    # Randomize the symbol order
+    symbols = SYMBOLS.dup.shuffle
+
+    if player_symbol
+      @players[:player].symbol = symbols.delete(player_symbol)
+    end
+
+    # Iterate over all the players that don't yet have symbols, and assign them one
+    @players.values.select { |player| !player.symbol }.each_with_index do |player, index|
+      player.symbol = symbols[index]
+    end
+
+    @current_player_index = 0
+
+    @board = {
+      :A1 => nil, :A2 => nil, :A3 => nil,
+      :B1 => nil, :B2 => nil, :B3 => nil,
+      :C1 => nil, :C2 => nil, :C3 => nil
+    }
+  end
+
+  def player_for_symbol(symbol)
+    @players.values.find { |player| player.symbol == symbol }
+  end
+
+  def player=(name)
+    @human_player.name = name
+  end
+
+  def player
+    @human_player.name
+  end
+
+  def player_symbol
+    @human_player.symbol
+  end
+
+  def computer_symbol
+    @computer_player.symbol
+  end
+
+  def welcome_player 
+    "Welcome #{@human_player.name}"
+  end
+
+  def current_player
+    key = @player_order[@current_player_index]
+    @players[key]
+  end
+
+  def advance_player
+    @current_player_index = (@current_player_index + 1) % 2
+  end
+
+  def indicate_player_turn
+    puts "#{@human_player.name}'s Move:"
+  end
+
+  def get_player_move
+    gets.chomp
+  end
+
+  def open_spots
+    @board.keys.select { |key| @board[key] == nil }
+  end
+
+  def open?(position)
+    open_spots.include?(position)
+  end
+
+  def taken?(position)
+    !open?(position)
+  end
+
+  def computer_move
+
+    puts "Computer's Move:"
+
+    position = open_spots.shuffle.first # :A2
+
+    puts position
+
+    @board[position] = computer_symbol
+
+    advance_player
+
+    position
+  end
+
+  def player_move
+    position = nil
+
+    begin
+      if position
+        puts "That spot is taken, please choose another:"
+      else
+        puts "It's your turn, please make a move:"
+      end
+
+      position = get_player_move.to_sym
+    end until open?(position)
+
+    @board[position] = player_symbol
+
+    advance_player
+
+    position
+  end
+
+  def determine_winner
+    win_scenarios = [
+      %w[A1 A2 A3],
+      %w[B1 B2 B3],
+      %w[C1 C2 C3],
+      %w[A1 B1 C1],
+      %w[A2 B2 C2],
+      %w[A3 B3 C3],
+      %w[A3 B2 C1],
+      %w[A1 B2 C3]
+    ].map { |array| array.map(&:to_sym) }
+
+    # Find the winning scenenario
+    win = win_scenarios.find do |scenario|
+      board_state = scenario.map { |c| @board[c] }
+
+      board_state.all? { |i| i == :O } || board_state.all? { |i| i == :X }
+    end
+
+    # Figure out which player won
+    if win
+      # [:B1, :B2, :B3]
+      winning_symbol = @board[win.first]
+      winning_player = player_for_symbol(winning_symbol)
+      winning_player.winner = true
+      @winner = winning_player
+    end
+
+  end
+
+  def player_won?
+    @human_player.winner
+  end
+
+  def computer_won?
+    @computer_player.winner
+  end
+
+  def spots_open?
+    open_spots.any?
+  end
+
+  def over?
+    @winner || !spots_open? 
+  end
+
+  def draw?
+    over? && !@winner
+  end
+
+  def current_state
+<<-BOARD
+    A   B   C
+  -------------
+1 | #{present_board_at(:A1)} | #{present_board_at(:B1)} | #{present_board_at(:C1)} |
+  -------------
+2 | #{present_board_at(:A2)} | #{present_board_at(:B2)} | #{present_board_at(:C2)} |
+  -------------
+3 | #{present_board_at(:A3)} | #{present_board_at(:B3)} | #{present_board_at(:C3)} |
+  -------------
+
+BOARD
+  end
+
+  def present_board_at(slot)
+    @board[slot] || " "
+  end
+end

week7/homework/play_game.rb

@@ -1,15 +1,24 @@
-require './features/step_definitions/tic-tac-toe.rb'
+current_dir = File.expand_path(File.dirname(__FILE__))
+require "#{current_dir}/lib/tic_tac_toe.rb"
 
 @game = TicTacToe.new
+
+puts "What's your name player?"
+
+name = gets.chomp
+@game.player = name
+
 puts @game.welcome_player
 
 until @game.over?
-	case @game.current_player
+	case @game.current_player.name
 	when "Computer"
 		@game.computer_move
 	when @game.player
-		@game.indicate_palyer_turn
+		@game.indicate_player_turn
 		@game.player_move
+  else
+    raise "It's nobody's move!"
 	end
 	puts @game.current_state
 	@game.determine_winner