Devoir #1-2 ROCK-PAPER-SCISSORS

class WrongNumberOfPlayersError < StandardError ; end
class NoSuchStrategyError < StandardError ; end

public

def rps_result(m1, m2)
  # YOUR CODE HERE
end

def invalid?(turn)
  !['r', 'p', 's'].include?(turn[1])
end

def rps_game_winner(game)
  game = game.map {|player, strategy| [player, strategy.downcase]}
  raise WrongNumberOfPlayersError unless game.length == 2
  raise NoSuchStrategyError if game.any? { |turn| invalid?(turn) }

  winning_strategies = [['r', 's'], ['s', 'p'], ['p', 'r']]
  strategies = game.map { |turn| turn[1] }
  
  (winning_strategies.include?(strategies) ||
   strategies.first == strategies.last) ? game.first : game.last
end


def is_game?(game)
  game[0][0].is_a?(String)
end


def rps_tournament_winner(tournament)
  
  if is_game?(tournament)
    rps_game_winner(tournament)
  else
    left, right = tournament
    
    wleft = rps_tournament_winner(left)
    wright = rps_tournament_winner(right)
    rps_game_winner([wleft, wright])
  end
end

game = [["Philippe", "R"], ["Louis", "S"]]

tournament = [
                [
                  [ ["Armando", "P"], ["Dave", "S"] ],
                  [ ["Richard", "R"], ["Michael", "S"] ]
                ],
                [
                  [ ["Allen", "S"], ["Omer", "P"] ],
                  [ ["David E.", "R"], ["Richard X.", "P"] ]
                ],
                [
                  [ ["Allen", "S"], ["Omer", "P"] ],
                  [ ["David E.", "R"], ["Richard X.", "P"] ]
                ],
                [
                  [ ["Allen", "S"], ["Omer", "P"] ],
                  [ ["David E.", "R"], ["Richard X.", "P"] ]
                ],
                [
                  [ ["Allen", "S"], ["Omer", "P"] ],
                  [ ["David E.", "R"], ["Richard X.", "P"] ]
                ],
                [
                  [ ["Allen", "S"], ["Omer", "P"] ],
                  [ ["David E.", "R"], ["Richard X.", "P"] ]
                ]
              ]