Tirsvad-Udemy-100-days-of-code/032-birthday-wisher
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2026-10-17 09:41:57 +02:00
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Architecture.md
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# Architecture
🌐 **English** · [Dansk](Architecture-da) · [Bahasa Melayu](Architecture-ms)
The code follows a small clean architecture. Imports point inward.
| Layer | Folder | Holds |
| --- | --- | --- |
| Domain | `src/birthday_wisher/domain/` | `Person` and the errors |
| Application | `src/birthday_wisher/application/` | The use case `send_birthday_wishes` and the ports (`BirthdayRepository`, `LetterSource`, `MailSender`) |
| Infrastructure | `src/birthday_wisher/infrastructure/` | CSV reader, letter files, SMTP mailer, settings |
| Presentation | `src/birthday_wisher/presentation/` | The command line and the composition root |
The tests mirror the layers: `tests/unit`, `tests/integration`, `tests/e2e`. The course hint of a dictionary keyed by `(month, day)` is `birthdays_by_day`.