tennis.rb

class TennisGame1
  POINTS_NAMES = {
    0 => 'Love',
    1 => 'Fifteen',
    2 => 'Thirty',
    3 => 'Forty'
  }.freeze
  DEUCE = 'Deuce'.freeze
  ADVANTAGE = 'Advantage'.freeze
  WIN_FOR = 'Win for'.freeze
  ALL = 'All'.freeze

  def initialize(player1_name, player2_name)
    @players = [
      { name: player1_name, points: 0 },
      { name: player2_name, points: 0 }
    ]
  end

  def won_point(player_name)
    (0..1).each do |i|
      @players[i][:points] += 1 if player_name == @players[i][:name]
    end
  end

  def score
    if @players[0][:points] == @players[1][:points]
      return result_for_equal_score
    elsif (@players[0][:points] >= 4) || (@players[1][:points] >= 4)
      difference_in_points = @players[0][:points] - @players[1][:points]
      return (difference_in_points.abs == 1) ? result_for_advantage : result_for_win
    else
      return "#{POINTS_NAMES[@players[0][:points]]}-#{POINTS_NAMES[@players[1][:points]]}"
    end
  end

  def result_for_equal_score
    return DEUCE if @players[0][:points] > 2
    "#{POINTS_NAMES[@players[0][:points]]}-#{ALL}"
  end

  def result_for_win
    WIN_FOR + ' ' + (@players[0][:points] > @players[1][:points] ? @players[0][:name] : @players[1][:name])
  end

  def result_for_advantage
    ADVANTAGE + ' ' + (@players[0][:points] > @players[1][:points] ? @players[0][:name] : @players[1][:name])
  end
end