Send email when course application is canceled

app/mailers/event/participation_canceled_mailer.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+#  Copyright (c) 2024, Schweizer Alpen-Club. This file is part of
+#  hitobito_sac_cas and licensed under the Affero General Public License version 3
+#  or later. See the COPYING file at the top-level directory or at
+#  https://github.com/hitobito/hitobito_sac_cas.
+
+class Event::ParticipationCanceledMailer < ApplicationMailer
+  include EventMailer
+  include MultilingualMailer
+
+  CONFIRMATION = "event_participation_canceled"
+
+  def confirmation(participation)
+    @participation = participation
+    @course = participation.event
+    @person = participation.person
+    headers[:bcc] = @course.groups.first.course_admin_email
+    locales = @course.language.split("_")
+
+    compose_multilingual(@person, CONFIRMATION, locales)
+  end
+end

app/models/sac_cas/event/participation.rb

@@ -16,10 +16,10 @@ module SacCas::Event::Participation
     attr_accessor :adult_consent, :terms_and_conditions, :newsletter, :check_root_conditions
 
     validates :adult_consent, :terms_and_conditions, acceptance: {if: :check_root_conditions}
-
     validates :actual_days, numericality: {greater_than_or_equal_to: 0, allow_blank: true}
-
     validate :assert_actual_days_size
+
+    after_update :send_application_canceled_email, if: :state_changed_to_canceled?
   end
 
   def subsidy_amount
@@ -59,4 +59,12 @@ def update_previous_state
       self.previous_state = state_was
     end
   end
+
+  def state_changed_to_canceled?
+    saved_change_to_attribute(:state)&.second == "canceled"
+  end
+
+  def send_application_canceled_email
+    Event::ParticipationCanceledMailer.confirmation(self).deliver_later
+  end
 end

db/seeds/custom_contents.rb

@@ -21,6 +21,9 @@
   {key: Event::ApplicationConfirmationMailer::ASSIGNED,
    placeholders_required: "event-name",
    placeholders_optional: "recipient-name, event-details, event-number, event-link, application-url, application-closing-at, person-url, missing-information"},
+  {key: Event::ParticipationCanceledMailer::CONFIRMATION,
+   placeholders_required: "event-name",
+   placeholders_optional: "recipient-name, event-details, event-number, event-link, application-url, person-url"},
   {key: Event::LeaderReminderMailer::REMINDER_NEXT_WEEK,
    placeholders_required: "event-name",
    placeholders_optional: "recipient-name, event-details, event-number, event-link"},
@@ -136,6 +139,16 @@
     "Person: {person-url}<br>" \
     "Event-Link: {event-link}<br>" \
     "Kursdetails:<br><br>{event-details}<br><br>{missing-information}"},
+  {custom_content_id: CustomContent.get(Event::ParticipationCanceledMailer::CONFIRMATION).id,
+   locale: "de",
+   label: "Kurs: E-Mail Abmeldung",
+   subject: "Kursabmeldung bestätigt",
+   body: "Hallo {recipient-name},<br><br>" \
+    "Deine Abmeldung für den Kurs {event-name} (Nummer: {event-number}) wurde bestätigt. " \
+    "Anmeldung: {application-url}<br>" \
+    "Person: {person-url}<br>" \
+    "Event-Link: {event-link}<br>" \
+    "Kursdetails:<br><br>{event-details}<br><br>{missing-information}"},
   {custom_content_id: leader_reminder_next_week_id,
    locale: "de",
    label: "Kurs: E-Mail Kursvorbereitungen abschliessen",

spec/mailers/event/participation_canceled_mailer_spec.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+#  Copyright (c) 2024, Schweizer Alpen-Club. This file is part of
+#  hitobito_sac_cas and licensed under the Affero General Public License version 3
+#  or later. See the COPYING file at the top-level directory or at
+#  https://github.com/hitobito/hitobito_sac_cas.
+
+require "spec_helper"
+
+describe Event::ParticipationCanceledMailer do
+  let(:event) { Fabricate(:sac_open_course) }
+  let(:participation) { event.participations.create!(person: people(:mitglied)) }
+  let(:mail) { described_class.confirmation(participation) }
+
+  before { event.groups.first.update!(course_admin_email: "admin@example.com") }
+
+  it "sends to email addresses of participant" do
+    expect(mail.to).to match_array(["e.hillary@hitobito.example.com"])
+    expect(mail.bcc).to match_array(["admin@example.com"])
+    expect(mail.body.to_s).to include(
+      "Hallo Edmund,",
+      "Deine Abmeldung für den Kurs Eventus (Nummer: #{event.number}) wurde bestätigt."
+    )
+  end
+end