gistfile1.rb

# Holds the current point at any given moment
#   set:   the set we're in
#   game:  the game we're in
#   point: the point we're in (aggregated)
#
#   Ex:
#   +----------+---+---+---+----+
#   | Nadal*   | 6 | 4 | 5 | 30 |
#   +----------+---+---+---+----+ ==> Nadal is serving for: Point.new(3,8,4)
#   | Djokovic | 4 | 6 | 2 | 15 |
#   +----------+---+---+---+----+
#
module Tennis
  class Point
    include Comparable

    attr_reader :set, :game, :point

    def initialize(set, game, point)
      @set = Integer(set)
      @game = Integer(game)
      @point = Integer(point)

      self.freeze
    end

    SLASH = '/'.freeze
    def to_s
      to_ary.join(SLASH)
    end

    def to_ary
      [set, game, point]
    end
    alias_method :mongoize, :to_ary

    def self.demongoize(ary)
      new(*ary) if ary
    end

    def ==(other)
      return false unless Point === other
      to_ary == other.to_ary
    end
    alias :eql? :==

    def <=>(other)
      fail unless Point === other
      to_ary <=> other.to_ary
    end

    def first_game_of_match?
      set == 1 && game == 1
    end

    def inspect
      "#<Point #{to_s}>"
    end
  end