Use budget stats model to calculate admin stats

This way we reduce duplication.

app/components/admin/stats/budget_balloting_component.rb

@@ -7,12 +7,20 @@ class Admin::Stats::BudgetBallotingComponent < ApplicationComponent
 
   private
 
+    def stats
+      @stats ||= Budget::Stats.new(budget)
+    end
+
+    def headings_stats
+      @headings_stats ||= stats.headings
+    end
+
     def vote_count
-      budget.lines.count
+      stats.total_votes
     end
 
     def user_count
-      budget.ballots.select { |ballot| ballot.lines.any? }.count
+      stats.total_participants_vote_phase
     end
 
     def vote_count_by_heading
@@ -21,9 +29,7 @@ class Admin::Stats::BudgetBallotingComponent < ApplicationComponent
 
     def user_count_by_heading
       budget.headings.map do |heading|
-        ballots = budget.ballots.joins(:lines).where(budget_ballot_lines: { heading_id: heading })
-
-        [heading.name, ballots.select(:user_id).distinct.count]
+        [heading.name, headings_stats[heading.id][:total_participants_vote_phase]]
       end.select { |_, count| count > 0 }.sort
     end
 end

app/components/admin/stats/budget_supporting_component.rb

@@ -7,30 +7,25 @@ class Admin::Stats::BudgetSupportingComponent < ApplicationComponent
 
   private
 
-    def votes
-      Vote.where(votable_type: "Budget::Investment")
-          .includes(:budget_investment)
-          .where(budget_investments: { heading_id: budget.heading_ids })
+    def stats
+      @stats ||= Budget::Stats.new(budget)
+    end
+
+    def headings_stats
+      @headings_stats ||= stats.headings
     end
 
     def vote_count
-      votes.count
+      stats.total_supports
     end
 
     def user_count
-      votes.select(:voter_id).distinct.count
+      stats.total_participants_support_phase
     end
 
     def user_count_by_heading
       budget.headings.map do |heading|
-        [heading, voters_in_heading(heading)]
+        [heading, headings_stats[heading.id][:total_participants_support_phase]]
       end
     end
-
-    def voters_in_heading(heading)
-      Vote.where(votable_type: "Budget::Investment")
-          .includes(:budget_investment)
-          .where(budget_investments: { heading_id: heading.id })
-          .select("votes.voter_id").distinct.count
-    end
 end

app/models/budget/stats.rb

@@ -53,6 +53,10 @@ class Budget::Stats
     budget.investments.count
   end
 
+  def total_supports
+    supports(budget).count
+  end
+
   def total_votes
     budget.ballots.pluck(:ballot_lines_count).sum
   end