tictactoe.rb

require 'pry'

def draw_board(b)
  system 'clear'
  puts ""
  puts "  #{b[1]}  |  #{b[2]}  |  #{b[3]}  "
  puts "-----+-----+-----"
  puts "  #{b[4]}  |  #{b[5]}  |  #{b[6]}  "
  puts "-----+-----+-----"
  puts "  #{b[7]}  |  #{b[8]}  |  #{b[9]}  "
end

def empty_positions(b)
  b.select {|k, v| v == ' ' }.keys
end

def player_picks(b)
  open = empty_positions(b)
  puts "Pick a position #{open}"
  pos = gets.chomp.to_i
  b[pos] = 'X'
end

def computer_picks(b)
  pos = empty_positions(b).sample
  if b[5] == ' '
    b[5] = 'O'
  else
    b[pos] = 'O'
  end
end

def check_winner(b)
  winning_lines = [[1,2,3], [4,5,6], [7,8,9], [1,4,7], [2,5,8], [3,6,9], [1,5,9], [3,5,7]]
  winning_lines.each do |line|
    if b[line[0]] == 'O' && b[line[1]] == 'O' && b[line[2]] == 'O'
      return 'Computer'
    end
    if b[line[0]] == 'X' && b[line[1]] == 'X' && b[line[2]] == 'X'
      return 'Player'
    end
  end
  return nil
end


board = {1 => ' ', 2 => ' ', 3 => ' ', 4 => ' ', 5 => ' ', 6 => ' ', 7 => ' ', 8 => ' ', 9 => ' '}

draw_board(board)

begin
  player_picks(board)
  computer_picks(board)
  draw_board(board)
  winner = check_winner(board)
  #binding.pry
end until winner || empty_positions(board).empty?

if winner
  puts "#{winner} won!"
else
  puts "game ended in a tie"
end