Description

When an applicant books the last available slot, the system must check if there are other invited applicants left without a slot. If so, the professor needs an immediate email alert.

Scenario:

• There are 2 invited applicants and 1 available slot.
• Applicant A books the last slot.
• Slots count drops to 0.
• System checks: Is there still an invited applicant without a booking? -> Yes (Applicant B).
• Action: Send warning email to Professor.

Tasks

Trigger mail Trigger o nly when InterviewBookingService.bookSlot() is called (Applicant self-service).

Logic:
Transaction: Booking is successful.
Check: remaining_future_slots == 0?
Check: pending_invitees > 0?
If both YES: Send Email to Professor.
Body: "The last slot changed to 'booked', but there are still candidates waiting. Please create more slots."

Acceptance Criteria

Professor gets notified