Added pdf analyzer

Analyzer should be moved to ActiveStorage::Analyzer
First there are many bugs with ActiveStorage that needs to be fixed:
Files are not deleted if job is destroyed (dependent: :purge is set)
If a new file is uploaded the old file is not deleted
(has_one_attechment)

app/models/job.rb

@@ -2,7 +2,7 @@ class Job < ApplicationRecord
   belongs_to :operator, class_name: 'User', optional: true
   belongs_to :costumer, class_name: 'User', optional: true
 
-  has_one_attached :pdf, dependent: :destroy
+  has_one_attached :pdf, dependent: :purge
 
   validates_presence_of :costumer_firstname, :costumer_lastname, :privacy_policy_accepted, :pdf
   validate :acceptable_pdf
@@ -11,6 +11,9 @@ class Job < ApplicationRecord
   before_save :update_paid_at, if: :will_save_change_to_status?
   before_save :update_status_changed_at, if: :will_save_change_to_status?
 
+  # 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
+
   # NOTE: Multiple status if paing before brinting?
   enum status: {
     open: 0,
@@ -53,12 +56,10 @@ class Job < ApplicationRecord
   def acceptable_pdf
     return unless pdf.attached?
 
-    errors.add(:pdf, 'is too big') unless pdf.blob.byte_size <= 100.megabyte
-
     acceptable_types = ['application/pdf']
-    return if acceptable_types.include?(pdf.content_type)
 
-    errors.add(:pdf, 'must be a PDF')
+    errors.add(:pdf, 'is too big') unless pdf.blob.byte_size <= 100.megabyte
+    errors.add(:pdf, 'must be a PDF') unless acceptable_types.include?(pdf.content_type)
   end
 
   def able_to_cancel?
@@ -84,4 +85,29 @@ class Job < ApplicationRecord
   def update_status_changed_at
     self.status_changed_at = Time.now
   end
+
+  def analyze_pdf
+    # return unless pdf.attached? && pdf.new_record?
+
+    # 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
+      self.number_of_plans_a0 += pdf_analyzer.pages_a0
+      self.number_of_plans_a1 += pdf_analyzer.pages_a1
+      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
+  end
 end