Added cost and cost_qm in job model

Changes to the migration file makes it necessary to reimport the
database: db:drop db:create db:migrate db:seed

app/models/job.rb

@@ -10,6 +10,7 @@ class Job < ApplicationRecord
   before_save :update_printed_at, if: :will_save_change_to_status?
   before_save :update_paid_at, if: :will_save_change_to_status?
   before_save :update_status_changed_at, if: :will_save_change_to_status?
+  before_save :set_cost_qm
 
   # TODO: works only when job is created. Should move analyzer to activestorage :https://discuss.rubyonrails.org/t/active-storage-in-production-lessons-learned-and-in-depth-look-at-how-it-works/83289
   after_create_commit :analyze_pdf
@@ -86,18 +87,29 @@ class Job < ApplicationRecord
     self.status_changed_at = Time.now
   end
 
+  def calc_cost
+    self.cost = (number_of_plans_a0 * cost_qm) + (number_of_plans_a1 * cost_qm / 2) +
+                (number_of_plans_a2 * cost_qm / 4) + (number_of_plans_a3 * cost_qm / 8) +
+                (costum_qm_plan * cost_qm)
+  end
+
+  def set_cost_qm
+    # TODO: get cost from global settings
+    self.cost_qm = 7
+  end
+
   def analyze_pdf
     # return unless pdf.attached? && pdf.new_record?
+    self.number_of_plans_a0 = 0
+    self.number_of_plans_a1 = 0
+    self.number_of_plans_a2 = 0
+    self.number_of_plans_a3 = 0
+    self.costum_qm_plan = 0
 
     # TODO: add any check if attachment has changed
 
     # pdfs.each do |pdf|
     pdf.blob.open do |file|
-      self.number_of_plans_a0 = 0
-      self.number_of_plans_a1 = 0
-      self.number_of_plans_a2 = 0
-      self.number_of_plans_a3 = 0
-      self.costum_qm_plan = 0
       # file = ActiveStorage::Blob.service.path_for(pdf.key).to_s
       pdf_analyzer = Services::PdfAnalyzer.new(file)
       pdf_analyzer.analyze
@@ -106,8 +118,9 @@ class Job < ApplicationRecord
       self.number_of_plans_a2 += pdf_analyzer.pages_a2
       self.number_of_plans_a3 += pdf_analyzer.pages_a3
       self.costum_qm_plan += pdf_analyzer.costum_qm
-      save
     end
     # end
+    calc_cost
+    save
   end
 end