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Fixed random double elimination seeding to avoid double byes in round 1 and evenly distribute the number of round 1 matches from the top and bottom half of the bracket

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Jacob Cody Wimer
2026-01-14 19:00:35 -05:00
parent 8b03a74b1e
commit 52df73d14f
2 changed files with 76 additions and 9 deletions
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49
app/services/tournament_services/tournament_seeding.rb
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@@ -19,14 +19,19 @@ class TournamentSeeding
half_of_bracket = bracket_size / 2
available_bracket_lines = (1..bracket_size).to_a
first_half_available_bracket_lines = (1..half_of_bracket).to_a
first_line_of_second_half_of_bracket = half_of_bracket + 1
second_half_available_bracket_lines = (first_line_of_second_half_of_bracket..bracket_size).to_a
# remove bracket lines that are taken from available_bracket_lines
wrestlers_with_bracket_lines = wrestlers.select{|w| w.bracket_line != nil }
wrestlers_with_bracket_lines.each do |wrestler|
available_bracket_lines.delete(wrestler.bracket_line)
first_half_available_bracket_lines.delete(wrestler.bracket_line)
second_half_available_bracket_lines.delete(wrestler.bracket_line)
end
available_bracket_lines_to_use = set_random_seeding_bracket_line_order(first_half_available_bracket_lines, second_half_available_bracket_lines)
wrestlers_without_bracket_lines = wrestlers.select{|w| w.bracket_line == nil }
if @tournament.tournament_type == "Pool to bracket"
wrestlers_without_bracket_lines.shuffle.each do |wrestler|
@@ -38,15 +43,10 @@ class TournamentSeeding
else
# Iterrate over the list randomly
wrestlers_without_bracket_lines.shuffle.each do |wrestler|
if first_half_available_bracket_lines.size > 0
random_available_bracket_line = first_half_available_bracket_lines.sample
wrestler.bracket_line = random_available_bracket_line
available_bracket_lines.delete(random_available_bracket_line)
first_half_available_bracket_lines.delete(random_available_bracket_line)
else
random_available_bracket_line = available_bracket_lines.sample
wrestler.bracket_line = random_available_bracket_line
available_bracket_lines.delete(random_available_bracket_line)
if available_bracket_lines_to_use.size > 0
bracket_line_to_use = available_bracket_lines_to_use.first
wrestler.bracket_line = bracket_line_to_use
available_bracket_lines_to_use.delete(bracket_line_to_use)
end
end
end
@@ -81,4 +81,35 @@ class TournamentSeeding
end
return wrestlers
end
private
def set_random_seeding_bracket_line_order(first_half_lines, second_half_lines)
# This method prevents double BYEs in round 1
# It also evenly distributes matches from the top half of the bracket to the bottom half
# It does both of these while keeping the randomness of the line assignment
odd_or_even = [0, 1]
odd_or_even_sample = odd_or_even.sample
# sort by odd or even based on the sample above
if odd_or_even_sample == 1
# odd numbers first
sorted_first_half_lines = first_half_lines.sort_by { |n| n.even? ? 1 : 0 }
sorted_second_half_lines = second_half_lines.sort_by { |n| n.even? ? 1 : 0 }
else
# even numbers first
sorted_first_half_lines = first_half_lines.sort_by { |n| n.odd? ? 1 : 0 }
sorted_second_half_lines = second_half_lines.sort_by { |n| n.odd? ? 1 : 0 }
end
# zip requires either even arrays or the receiver to be the bigger list
if first_half_lines.size >= second_half_lines.size
result = sorted_first_half_lines.zip(sorted_second_half_lines).flatten
else
result = sorted_second_half_lines.zip(sorted_first_half_lines).flatten
end
result.compact
result.delete(nil)
result
end
end