ready4god2513 · October 3, 2014 22:24 · Oct 3, 2014 · Oct 3, 2014
diff --git a/tictactoe → tictactoe.rb b/tictactoe → tictactoe.rb
diff --git a/tictactoe b/tictactoe
@@ -0,0 +1,85 @@
+require 'set'
+
+class TicTacToe
+
+  WINNING_LINES = [
+    Set.new([0, 1, 2]),
+    Set.new([0, 3, 6]),
+    Set.new([0, 4, 8]),
+    Set.new([1, 4, 7]),
+    Set.new([2, 5, 8]),
+    Set.new([2, 4, 6]),
+    Set.new([3, 4, 5]),
+    Set.new([6, 7, 8])
+  ].freeze
+
+  attr_reader :players
+  Player = Struct.new(:name, :moves)
+
+  def initialize(player1, player2)
+    @players = []
+    @players << Player.new(player1, Set.new)
+    @players << Player.new(player2, Set.new)
+  end
+
+  def move(position)
+    return puts 'Move taken or invalid' unless available_move?(position)
+
+    take_turn do |player|
+      player.moves.add(position)
+      determine_game_standing
+    end
+
+    puts "#{current_player.name}'s turn"
+  end
+
+  def available_moves
+    Set[*(0..8).to_a] - taken_moves
+  end
+
+  private
+
+  def tie?
+    available_moves.empty? && !winner?
+  end
+
+  def determine_game_standing
+    notify_winner if winner?
+    notify_of_tie if tie?
+    reset if (tie? || winner?)
+  end
+
+  def available_move?(position)
+    available_moves.include?(position)
+  end
+
+  def notify_winner
+    puts "#{current_player.name} wins!"
+  end
+
+  def notify_tie
+    puts 'It\'s a tie!'
+  end
+
+  def taken_moves
+    players[0].moves | players[1].moves
+  end
+
+  def reset
+    players.each { |p| p.moves.clear }
+  end
+
+  def winner?
+    WINNING_LINES.any? { |l| l == current_player.moves }
+  end
+
+  def current_player
+    players.first
+  end
+
+  def take_turn
+    yield current_player
+    players.rotate!
+  end
+
+end
No results found