Turn contest dashboard into tabs for easier navigation

app/controllers/contestants_controller.rb

@@ -3,6 +3,19 @@ class ContestantsController < ApplicationController
   before_action :set_contestant, only: %i[ destroy edit update]
   before_action :set_completions, only: %i[edit update ]
 
+  def index
+    authorize @contest
+
+    @title = @contest.name
+    @contestants = @contest.contestants.sort_by { |contestant| [
+      -contestant.completions.where(remaining_pieces: nil).size,
+      (contestant.completions.where(remaining_pieces: nil).size == @contest.puzzles.length ? 1 : 0) * contestant.time_seconds,
+      contestant.completions.size > 0 && contestant.completions[-1].remaining_pieces ? contestant.completions[-1].remaining_pieces : 1000000,
+      contestant.time_seconds
+    ] }
+    filter_contestants_per_category
+  end
+
   def edit
     authorize @contest
 
@@ -158,4 +171,14 @@ class ContestantsController < ApplicationController
     end
     @contestant.save
   end
+
+  def filter_contestants_per_category
+    if params.key?(:category) && params[:category] != "-1"
+      if params[:category] == "-2"
+        @contestants = @contestants.select { |contestant| contestant.categories.size == 0 }
+      else
+        @contestants = @contestants.select { |contestant| contestant.categories.where(id: params[:category]).any? }
+      end
+    end
+  end
 end