trabajo-afectivo/spec/lib/signature_detection_spec.rb

require 'rails_helper'

RSpec.describe SignatureDetection do
  describe '.find_signature' do
    context 'when given an array of hashes' do
      let(:messages) do
        raw_message_files.map do |f|
          { content: File.read(f), content_type: content_type }
        end
      end

      context 'with plain text messages in their :content keys (sample input 1)' do
        let(:content_type) { 'text/plain' }

        let(:raw_message_files) do
          [
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_a_1.txt'),
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_a_2.txt'),
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_a_3.txt')
          ]
        end

        it 'returns the first 5–10-line substring they share in common' do
          expect(SignatureDetection.find_signature(messages)).to eq(<<~SIG.chomp)

            Mit freundlichen Grüßen

            Bob Smith
            Berechtigungen und dez. Department
            ________________________________

            Musik AG
            Berechtigungen und dez. Department (ITPBM)
            Kastanien 2
          SIG
        end
      end

      context 'with plain text messages in their :content keys (sample input 2)' do
        let(:content_type) { 'text/plain' }

        let(:raw_message_files) do
          [
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_b_1.txt'),
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_b_2.txt'),
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_b_3.txt')
          ]
        end

        it 'returns the first 5–10-line substring they share in common' do
          expect(SignatureDetection.find_signature(messages)).to eq(<<~SIG.chomp)

            Freundliche Grüße

            Günter Lässig
            Lokale Daten

            Music GmbH
            Baustraße 123, 12345 Max City
            Telefon 0123 5432114
            Telefax 0123 5432139
          SIG
        end
      end

      context 'with HTML messages in their :content keys' do
        let(:content_type) { 'text/html' }

        let(:raw_message_files) do
          [
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_c_1.html'),
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_c_2.html'),
            Rails.root.join('test', 'data', 'email_signature_detection', 'client_c_3.html')
          ]
        end

        it 'converts messages (via #html2text) then returns the first 5–10-line substring they share in common' do
          expect(SignatureDetection.find_signature(messages)).to eq(<<~SIG.chomp)

            ChristianSmith
            Technik

            Tel: +49 12 34 56 78 441
            Fax: +49 12 34 56 78 499
            Email: Christian.Smith@example.com
            Web: www.example.com
            ABC KFZ- und Flugzeug B.V. & Co. KG
            Hauptverwaltung
          SIG
        end
      end
    end
  end

  describe '.find_signature_line' do
    context 'when given a plain text message' do
      let(:content_type) { 'text/plain' }
      let(:content) { File.read(Rails.root.join('test', 'data', 'email_signature_detection', 'client_a_1.txt')) }

      context 'and a substring it contains' do
        let(:signature) { <<~SIG.chomp }

          Mit freundlichen Grüßen

          Bob Smith
          Berechtigungen und dez. Department
          ________________________________

          Musik AG
          Berechtigungen und dez. Department (ITPBM)
          Kastanien 2
        SIG

        it 'returns the line of the message where the signature begins' do
          expect(SignatureDetection.find_signature_line(signature, content, content_type)).to eq(10)
        end
      end
    end

    context 'when given an HTML message' do
      let(:content_type) { 'text/html' }
      let(:content) { File.read(Rails.root.join('test', 'data', 'email_signature_detection', 'example1.html')) }

      context 'and a substring it contains' do
        let(:signature) { <<~SIG.chomp }
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Bob Smith
          ABC Organisation

          EXAMPLE IT-Service GmbH
          Dorten 5 F&E
          12345 Da / Germany
          Phone: +49 (0) 1234 567 890 / +49 (0) 1234 567 891
          Fax:     +49 (0) 1234 567 892
        SIG

        it 'converts messages (via #html2text) then returns the line of the message where the signature begins' do
          expect(SignatureDetection.find_signature_line(signature, content, content_type)).to eq(11)
        end
      end
    end
  end

  describe '.rebuild_all_articles' do
    context 'when a user exists with a recorded signature' do
      let!(:customer) { create(:customer_user, preferences: { signature_detection: "\nbar" }) }

      context 'and multiple articles exist for that customer' do
        let!(:articles) do
          [create(:ticket_article, created_by_id: customer.id, body: "foo\nfoo\nbar"),
           create(:ticket_article, created_by_id: customer.id, body: "foo\nbar")]
        end

        it 'updates the signature-line data of all articles' do
          expect { SignatureDetection.rebuild_all_articles }
            .to change { articles.first.reload.preferences[:signature_detection] }.to(3)
            .and change { articles.second.reload.preferences[:signature_detection] }.to(2)
        end
      end
    end
  end
end