affiche evolution temps de traitement

app/models/procedure.rb

@@ -582,6 +582,37 @@ class Procedure < ApplicationRecord
     end
   end
 
+  def usual_traitement_time_by_month
+    first_processed_at = Traitement.includes(:dossier)
+      .where(dossier: self.dossiers)
+      .where.not('dossiers.en_construction_at' => nil, :processed_at => nil)
+      .order(:processed_at)
+      .pick(:processed_at)
+
+    return [] if first_processed_at.nil?
+    month_index = first_processed_at.at_end_of_month
+    month_range = []
+    while month_index <= Time.zone.now.at_end_of_month
+      month_range << month_index
+      month_index += 1.month
+    end
+
+    month_range.map do |month|
+      [I18n.l(month, format: "%B %Y"), compute_usual_traitement_time_for_month(month)]
+    end
+  end
+
+  def usual_traitement_time_by_month_in_days
+    usual_traitement_time_by_month.map do |month, time_in_seconds|
+      if time_in_seconds.present?
+        time_in_days = (time_in_seconds / 60.0 / 60.0 / 24.0).ceil
+      else
+        time_in_days = nil
+      end
+      [month, time_in_days]
+    end
+  end
+
   def populate_champ_stable_ids
     TypeDeChamp
       .joins(:revisions)