module EasyRr

# File lib/easy_rr.rb, line 4
def self.matches(participants,*facingMatches)

      if participants.class != Array
              participants = participants.to_a
      end

  fMatches = !facingMatches[0].nil? ? facingMatches[0] : 1

  if participants.size.odd?
      participants.push nil
  end

  length = participants.size

  last_e = participants.pop

  matches = ( ( ( fMatches*length ) ) - fMatches ).times.map do
    participants.rotate!
    [[participants.first, last_e]] + (1...(length/2)).map { |j| [participants[j], participants[length - 1 - j]] }
  end

  unless last_e.nil?
      participants.push last_e
  end
  
  return matches
end