wrestlingdev.com/app/services/bracket_advancement/modified_double_elimination_advance.rb

class ModifiedDoubleEliminationAdvance

    attr_reader :matches_to_advance

    def initialize(wrestler,last_match, matches: nil)
           @wrestler = wrestler
           @last_match = last_match
           @matches = matches || @wrestler.weight.matches.to_a
           @matches_to_advance = []
       @next_match_position_number = (@last_match.bracket_position_number / 2.0)
    end
   
    def bracket_advancement
      advance_wrestler
      advance_double_byes
      set_bye_for_placement
    end
   
    def advance_wrestler
      if @last_match.winner == @wrestler
        winners_bracket_advancement
      elsif @last_match.winner != @wrestler
        losers_bracket_advancement
      end
    end
   
    def winners_bracket_advancement
     if (@last_match.loser1_name == "BYE" or @last_match.loser2_name == "BYE") and @last_match.is_championship_match
       update_consolation_bye
     end
     if @last_match.bracket_position == "Quarter"
        new_match = @matches.find { |m| m.bracket_position == "Semis" && m.bracket_position_number == @next_match_position_number.ceil && m.weight_id == @wrestler.weight_id }
        update_new_match(new_match, get_wrestler_number)
     elsif @last_match.bracket_position == "Semis"
        new_match = @matches.find { |m| m.bracket_position == "1/2" && m.bracket_position_number == @next_match_position_number.ceil && m.weight_id == @wrestler.weight_id }
        update_new_match(new_match, get_wrestler_number)
     elsif @last_match.bracket_position == "Conso Semis"
          new_match = @matches.find { |m| m.bracket_position == "5/6" && m.bracket_position_number == @next_match_position_number.ceil && m.weight_id == @wrestler.weight_id }
          update_new_match(new_match, get_wrestler_number)
     elsif @last_match.bracket_position == "Conso Quarter"
        # it's a special bracket where a semi loser is not dropping down
        new_match = @matches.find { |m| m.bracket_position == "Conso Semis" && m.bracket_position_number == @next_match_position_number.ceil && m.weight_id == @wrestler.weight_id }
        update_new_match(new_match, get_wrestler_number)
     elsif @last_match.bracket_position == "Bracket Round of 16"
        new_match = @matches.select { |m| m.bracket_position_number == @next_match_position_number.ceil && m.weight_id == @wrestler.weight_id && m.round > @last_match.round && m.bracket_position == "Quarter" }.sort_by(&:round).first
        update_new_match(new_match, get_wrestler_number)
     elsif @last_match.bracket_position == "Conso Round of 8"
        new_match = @matches.select { |m| m.bracket_position_number == @last_match.bracket_position_number && m.weight_id == @wrestler.weight_id && m.round > @last_match.round && m.bracket_position == "Conso Quarter" }.sort_by(&:round).first
        update_new_match(new_match, get_wrestler_number)
     end
    end
    
    def update_new_match(match, wrestler_number)
        return unless match
        if wrestler_number == 2 or (match.loser1_name and match.loser1_name.include? "Loser of")
             match.w2 = @wrestler.id
        elsif  wrestler_number == 1
             match.w1 = @wrestler.id
        end
    end
   
    def update_consolation_bye
       bout = @wrestler.last_match.bout_number
       next_match = @matches.find { |m| m.weight_id == @wrestler.weight_id && (m.loser1_name == "Loser of #{bout}" || m.loser2_name == "Loser of #{bout}") }
       if next_match
         replace_loser_name_with_bye(next_match, "Loser of #{bout}")
       end
    end
   
    def get_wrestler_number
      if @next_match_position_number != @next_match_position_number.ceil
         return 1
      elsif @next_match_position_number == @next_match_position_number.ceil
         return 2
      end
    end
   
    def losers_bracket_advancement
     bout = @last_match.bout_number
     next_match = @matches.find { |m| m.weight_id == @wrestler.weight_id && (m.loser1_name == "Loser of #{bout}" || m.loser2_name == "Loser of #{bout}") }
     
     if next_match.present?
       replace_loser_name_with_wrestler(next_match, @wrestler, "Loser of #{bout}")
   
       if next_match.loser1_name == "BYE" || next_match.loser2_name == "BYE"
         next_match.winner_id = @wrestler.id
         next_match.win_type = "BYE"
         next_match.score = ""
         next_match.finished = 1
         next_match.finished_at = Time.current
         @matches_to_advance << next_match
       end
     end
    end
   
   
    def advance_double_byes
      weight = @wrestler.weight
      @matches.select{|m| m.weight_id == weight.id && m.loser1_name == "BYE" and m.loser2_name == "BYE" and m.finished != 1}.each do |match|
         match.finished = 1
         match.finished_at = Time.current
         match.score = ""
         match.win_type = "BYE"
         next_match_position_number = (match.bracket_position_number / 2.0).ceil
         after_matches = @matches.select{|m| m.weight_id == weight.id && m.round > match.round and m.is_consolation_match == match.is_consolation_match }.sort_by{|m| m.round}
         next if after_matches.empty?
         next_matches = @matches.select{|m| m.weight_id == weight.id && m.round == after_matches.first.round and m.is_consolation_match == match.is_consolation_match }
         this_round_matches = @matches.select{|m| m.weight_id == weight.id && m.round == match.round and m.is_consolation_match == match.is_consolation_match }
         next_match = nil
   
         if next_matches.size == this_round_matches.size
           next_match = next_matches.select{|m| m.bracket_position_number == match.bracket_position_number}.first
           next_match.loser2_name = "BYE" if next_match
         elsif next_matches.size < this_round_matches.size and next_matches.size > 0
           next_match = next_matches.select{|m| m.bracket_position_number == next_match_position_number}.first
           if next_match && next_match.bracket_position_number == next_match_position_number
             next_match.loser2_name = "BYE"
           elsif next_match
             next_match.loser1_name = "BYE"
           end
         end
      end
    end
   
    def set_bye_for_placement
     weight = @wrestler.weight
     seventh_finals = @matches.select{|match| match.weight_id == weight.id && match.bracket_position == '7/8'}.first
     if seventh_finals
       conso_quarter = @matches.select{|match| match.weight_id == weight.id && match.bracket_position == 'Conso Semis'}
       conso_quarter.each do |match|
         if match.loser1_name == "BYE" or match.loser2_name == "BYE"
           replace_loser_name_with_bye(seventh_finals, "Loser of #{match.bout_number}")
         end
       end
     end
    end

    def replace_loser_name_with_wrestler(match, wrestler, loser_name)
      match.w1 = wrestler.id if match.loser1_name == loser_name
      match.w2 = wrestler.id if match.loser2_name == loser_name
    end

    def replace_loser_name_with_bye(match, loser_name)
      match.loser1_name = "BYE" if match.loser1_name == loser_name
      match.loser2_name = "BYE" if match.loser2_name == loser_name
    end
   end