Codigo para generar un fixture de futbol (muy eficiente)

Aca les dejo un codigo que sirve para generar un fixture de futbol, de la manera mas eficiente que he visto hasta el momento.

Para genrar un fixture lo que debes hacer es DeportFixture.new(lista de cuadros).groups eso te debuelve el fixture.

class DeportFixture

def initialize(elements)
@elements = elements
@elements << nil if elements.length.odd?
@round_number = @elements.length - 1
@rounds = Array.new(@round_number, nil)
@last_element = @elements[-1]
end

def groups
fixture = Array.new(@round_number, nil)

@round_number.times do |time|
@rounds[time] ||= []

if time == 0
(@elements.length / 2).times do |element_id|
@rounds[time] << @elements[element_id]
@rounds[time] << @elements[-(element_id+1)]
end
else
previous_round = @rounds[time-1].clone
first_element, second_element = previous_round[-1], @last_element
first_element, second_element = @last_element, previous_round[-1] if time.odd?

previous_round.delete(first_element)
previous_round.delete(second_element)
previous_round.compact!

@rounds[time] << first_element
@rounds[time] << second_element

new_round_elements = []

while not previous_round.empty?
elements = previous_round.slice!(-2,2)

elements.each {|element| new_round_elements << element}
end

new_round_elements.each {|element| @rounds[time] << element}
end
end

@rounds.each_with_index do |round, index|
fixture[index] = []

(round.length / 2).times do |team|
item_1 = round[(team * 2)]
item_2 = round[(team * 2) + 1]
fixture[index] << [item_1, item_2] unless item_1.nil? or item_2.nil?
end
end

fixture
end

end