focus-flow/Codex Documentation/Completed Plans/V1_BLOCK_21_Notification_Abstraction_Layer.md

V1 Block 21 — Notification Abstraction Layer

Purpose: Define NotificationAdapter contract.

Note for Codex: Follow tasks exactly; avoid exploratory calls when tasks specify names/files/tests.

Chunk 21.1 — NotificationAdapter contract

Recommended level: XHIGH

Status: Complete on 2026-06-26.

Tasks

1. Add package packages/scheduler_notifications.
2. Declare sealed class NotificationRequest with fields: id, title, body, scheduledDateTimeUtc, payloadJson.
3. Declare enum NotificationFeedbackType (clicked,dismissed,action).
4. Define abstract NotificationAdapter with methods Future<void> schedule(NotificationRequest), Future<void> cancel(String id), Stream<NotificationFeedback>.
5. Add stub FakeNotificationAdapter for tests emitting events via StreamController.

Acceptance criteria

1. Package compiles and dart test passes stub test fake_adapter_test.dart.

Completed implementation

1. Added package packages/scheduler_notifications with public entry points notifications.dart and scheduler_notifications.dart.
2. Added sealed NotificationRequest with factory construction and fields id, title, body, scheduledDateTimeUtc, and payloadJson.
3. Added NotificationFeedbackType with clicked, dismissed, and action.
4. Added NotificationFeedback event model.
5. Added abstract NotificationAdapter with schedule, cancel, and feedback.
6. Added FakeNotificationAdapter backed by a broadcast StreamController.
7. Wired fake adapter tests into the root test wrapper.

Verification

1. dart pub get: passed.
2. dart format test/scheduler_core_test.dart packages/scheduler_notifications: passed.
3. cd packages/scheduler_notifications && dart analyze: passed, no issues found.
4. cd packages/scheduler_notifications && dart test: passed, 2 tests.
5. dart analyze: passed, no issues found.
6. dart test: passed, 318 tests.
7. scripts/test.sh: not present or not executable.

---