Development: Send professor confirmation email on manual slot assignment

src/main/java/de/tum/cit/aet/interview/service/InterviewService.java

@@ -591,11 +591,13 @@ public InterviewSlotDTO assignSlotToInterviewee(UUID slotId, UUID applicationId)
     private void sendInterviewInvitationEmail(InterviewSlot slot, Interviewee interviewee, Job job) {
         Application application = interviewee.getApplication();
         User applicant = application.getApplicant().getUser();
+        User professor = job.getSupervisingProfessor();
 
         String icsContent = icsCalendarService.generateIcsContent(slot, job);
         String icsFileName = icsCalendarService.generateFileName(slot);
 
-        Email email = Email.builder()
+        // Email to Applicant (with ICS)
+        Email applicantEmail = Email.builder()
             .to(applicant)
             .emailType(EmailType.INTERVIEW_INVITATION)
             .language(Language.fromCode(applicant.getSelectedLanguage()))
@@ -604,8 +606,19 @@ private void sendInterviewInvitationEmail(InterviewSlot slot, Interviewee interv
             .icsContent(icsContent)
             .icsFileName(icsFileName)
             .build();
+        asyncEmailSender.sendAsync(applicantEmail);
 
-        asyncEmailSender.sendAsync(email);
+        // Email to Professor (confirmation with ICS)
+        Email professorEmail = Email.builder()
+            .to(professor)
+            .emailType(EmailType.INTERVIEW_ASSIGNED_PROFESSOR)
+            .language(Language.fromCode(professor.getSelectedLanguage()))
+            .researchGroup(job.getResearchGroup())
+            .content(slot)
+            .icsContent(icsContent)
+            .icsFileName(icsFileName)
+            .build();
+        asyncEmailSender.sendAsync(professorEmail);
     }
 
     /**

src/main/java/de/tum/cit/aet/notification/constants/EmailType.java

@@ -68,6 +68,12 @@ public enum EmailType {
      */
     INTERVIEW_BOOKED_PROFESSOR("INTERVIEW_BOOKED_PROFESSOR", Set.of(UserRole.PROFESSOR, UserRole.EMPLOYEE), false, false),
 
+    /**
+     * Confirmation to professor when they manually assign a slot to an applicant
+     * To: Supervising professor of the job
+     */
+    INTERVIEW_ASSIGNED_PROFESSOR("INTERVIEW_ASSIGNED_PROFESSOR", Set.of(UserRole.PROFESSOR, UserRole.EMPLOYEE), false, false),
+
     /**
      * Invitation to self-schedule an interview slot
      * To: Applicant

src/main/resources/templates/de/INTERVIEW_ASSIGNED_PROFESSOR.html

@@ -0,0 +1,15 @@
+<p>Sehr geehrte*r ${PROFESSOR_FIRST_NAME!} ${PROFESSOR_LAST_NAME!},</p>
+
+<p>Sie haben erfolgreich ein Interview mit <strong>${APPLICANT_FIRST_NAME!} ${APPLICANT_LAST_NAME!}</strong> für die
+    Position <strong>${JOB_TITLE!}</strong> geplant.</p>
+
+<p><strong>Interview-Details:</strong></p>
+<ul>
+    <li><strong>Datum:</strong> ${INTERVIEW_DATE!}</li>
+    <li><strong>Uhrzeit:</strong> ${INTERVIEW_START_TIME!} – ${INTERVIEW_END_TIME!}</li>
+    <li><strong>Ort:</strong> ${INTERVIEW_LOCATION!}</li>
+</ul>
+
+<p>Eine Kalendereinladung (.ics) ist dieser E-Mail angehängt.</p>
+
+<p>Mit freundlichen Grüßen,<br />Ihr TUMApply Team</p>

src/main/resources/templates/de/INTERVIEW_ASSIGNED_PROFESSOR_subject.html

@@ -0,0 +1 @@
+Interview geplant mit ${APPLICANT_FIRST_NAME!} ${APPLICANT_LAST_NAME!}

src/main/resources/templates/en/INTERVIEW_ASSIGNED_PROFESSOR.html

@@ -0,0 +1,15 @@
+<p>Dear ${PROFESSOR_FIRST_NAME!} ${PROFESSOR_LAST_NAME!},</p>
+
+<p>You have successfully scheduled an interview with <strong>${APPLICANT_FIRST_NAME!} ${APPLICANT_LAST_NAME!}</strong>
+    for the position <strong>${JOB_TITLE!}</strong>.</p>
+
+<p><strong>Interview Details:</strong></p>
+<ul>
+    <li><strong>Date:</strong> ${INTERVIEW_DATE!}</li>
+    <li><strong>Time:</strong> ${INTERVIEW_START_TIME!} – ${INTERVIEW_END_TIME!}</li>
+    <li><strong>Location:</strong> ${INTERVIEW_LOCATION!}</li>
+</ul>
+
+<p>A calendar invitation (.ics) is attached to this email.</p>
+
+<p>Best regards,<br />Your TUMApply Team</p>

src/main/resources/templates/en/INTERVIEW_ASSIGNED_PROFESSOR_subject.html

@@ -0,0 +1 @@
+Interview Scheduled with ${APPLICANT_FIRST_NAME!} ${APPLICANT_LAST_NAME!}

src/test/java/de/tum/cit/aet/interview/web/rest/InterviewResourceTest.java

@@ -828,6 +828,17 @@ void assignSlotSuccessfullyAssignsInterviewee() {
             assertThat(result.isBooked()).isTrue();
             assertThat(result.interviewee()).isNotNull();
             assertThat(result.interviewee().applicationId()).isEqualTo(application.getApplicationId());
+
+            // Verify 2 emails sent: 1 to applicant, 1 to professor
+            ArgumentCaptor<Email> emailCaptor = ArgumentCaptor.forClass(Email.class);
+            verify(asyncEmailSenderMock, times(2)).sendAsync(emailCaptor.capture());
+
+            List<Email> sentEmails = emailCaptor.getAllValues();
+            assertThat(sentEmails).hasSize(2);
+            assertThat(sentEmails.stream().map(Email::getEmailType)).containsExactlyInAnyOrder(
+                EmailType.INTERVIEW_INVITATION,
+                EmailType.INTERVIEW_ASSIGNED_PROFESSOR
+            );
         }
 
         @Test