BUSTED: what a mess. trying to get tournament round generation bits working. ack.

rails/map-mash/app/models/map.rb

@@ -2,6 +2,8 @@ require 'fastercsv'
 
 
 class Map < ActiveRecord::Base
+  belongs_to :mash, :class_name => 'Mash'
+
   def self.from_city_name(city_name)
     self.find_or_initialize_by_name(city_name).save!
   end

rails/map-mash/app/models/mash.rb

@@ -2,5 +2,14 @@ class Mash < ActiveRecord::Base
   has_one :map_a, :class_name => 'Map'
   has_one :map_b, :class_name => 'Map'
   has_one :winner, :class_name => 'Map'
-  belongs_to :requester
+  belongs_to :tournament, :class_name => 'MashTournament'
+  belongs_to :round, :class_name => 'MashTournamentRound'
+
+  named_scope :unplayed, {
+    :conditions => %{
+        winner_id IS NULL
+        AND map_a_id IS NOT NULL
+        AND map_b_id IS NOT NULL
+    }
+  }
 end

rails/map-mash/app/models/mash_tournament.rb

@@ -1,2 +1,106 @@
 class MashTournament < ActiveRecord::Base
+  belongs_to :requester
+  has_many :mashes
+  has_many :rounds, :class_name => 'MashTournamentRound'
+  after_create :create_rounds
+  after_save :maybe_fill_in_next_round
+
+  def next_unplayed_mash
+    self.mashes.unplayed.first
+  end
+
+  def done?
+    true
+  end
+
+  def round(number = 0)
+    MashTournamentRound.find_by_mash_tournament_id(self.id,
+        :conditions => {:number => number}
+    )
+  end
+
+  private
+  def create_rounds
+    n_contenders = Map.count
+    while n_contenders % 4 != 0
+      n_contenders -= 1
+    end
+
+    round = 0
+
+    while n_contenders > 2
+      create_round(round, n_contenders)
+      n_contenders = n_contenders / 2
+      round += 1
+    end
+
+    assign_maps_for_round_zero
+    self.total_rounds = round - 1
+  end
+
+  def create_round(round_number, n_contenders)
+    round = MashTournamentRound.new(
+      :mash_tournament_id => self.id,
+      :number => round_number,
+      :mash_count => n_contenders / 2
+    )
+    round.save!
+
+    n_contenders.times do
+      Mash.new(
+        :mash_tournament_id => self.id,
+        :mash_tournament_round_id => round.id
+      ).save!
+    end
+  end
+
+  def maybe_fill_in_next_round
+    self.rounds.sort(&:number).each do |round|
+      if not round.done?
+        assign_maps_for_round(round)
+        return
+      end
+    end
+  end
+
+  def assign_maps_for_round(round)
+    previous = MashTournamentRound.find_by_mash_tournament_id_and_number(
+                  self.id, round.number - 1
+                )
+    previous_winners = previous.mashes.collect(&:winner_id)
+    pool = Map.all(
+      :order => 'RANDOM()',
+      :conditions => ['id in ?', previous_winners]
+    )
+
+    round.mashes.each do |mash|
+      mash.update_attributes(
+        :map_a_id => pool.pop.id,
+        :map_b_id => pool.pop.id
+      )
+    end
+  end
+
+  def assign_maps_for_round_zero
+    round = MashTournamentRound.for_round(self.id, 0)
+    pool = Map.all(
+      :order => 'RANDOM()',
+      :limit => round.mash_count * 2
+    )
+
+    logger.info("Populating mashes from pool: #{pool.inspect}")
+
+    round.mashes.each do |mash|
+      map_a = pool.pop
+      map_b = pool.pop
+      logger.info("Assigning `map_a` from #{map_a.inspect}, " +
+                  "`map_b` from #{map_b.inspect} to mash #{mash.inspect}")
+      logger.info("`map_a`.`id` = #{map_a.id}, `map_b`.`id` = #{map_b.id} ")
+
+      mash.update_attributes(
+        :map_a_id => map_a.id,
+        :map_b_id => map_b.id
+      )
+    end
+  end
 end

rails/map-mash/app/models/mash_tournament_round.rb

@@ -0,0 +1,8 @@
+class MashTournamentRound < ActiveRecord::Base
+  belongs_to :tournament, :class_name => 'MashTournament'
+  has_many :mashes
+
+  def self.for_round(tournament, round_number)
+    self.find_by_mash_tournament_id_and_number(tournament, round_number)
+  end
+end

rails/map-mash/app/models/requester.rb

@@ -1,3 +1,7 @@
 class Requester < ActiveRecord::Base
-  has_many :mashes
+  has_many :mash_tournaments
+
+  def current_tournament
+    self.mash_tournaments.last
+  end
 end