FitTrack_GarminSync/specs/002-intialspecv2/tasks.md

Tasks: IntialSpecV2

Input: Design documents from /specs/002-intialspecv2/ Prerequisites: plan.md (required), spec.md (required for user stories), research.md, contracts/

Tests: The examples below include test tasks. Tests are OPTIONAL - only include them if explicitly requested in the feature specification.

Organization: Tasks are grouped by user story to enable independent implementation and testing of each story.

Format: [ID] [P?] [Story] Description

• [P]: Can run in parallel (different files, no dependencies)
• [Story]: Which user story this task belongs to (e.g., US1, US2, US3)
• Include exact file paths in descriptions

Path Conventions

• Web app: backend/src/, frontend/src/

Phase 1: Setup (Shared Infrastructure)

Purpose: Project initialization and basic structure

• T001 Create project structure (backend/, frontend/, tests/)
• T002 Initialize Python backend project with dependencies (FastAPI, garth, garminconnect) in backend/
• T003 [P] Configure linting and formatting tools for Python in backend/
• T004 [P] Setup Docker and Docker Compose for development environment

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Phase 2: Foundational (Blocking Prerequisites)

Purpose: Core infrastructure that MUST be complete before ANY user story can be implemented

⚠️ CRITICAL: No user story work can begin until this phase is complete

• T005 Setup CentralDB integration (FR-016, FR-017)

  • Define CentralDB client/SDK generation from DB_API_SPEC.json
  • Implement CentralDB client in backend/src/services/central_db_service.py

• T007 Implement authentication/authorization framework (FR-001, FR-012)

  • Create User authentication service in backend/src/services/auth_service.py to use CentralDB for authentication
  • Implement Garmin Connect authentication flow using garth and garminconnect (FR-019)

• T008 Setup API routing and middleware structure (FR-013: default to port 8001)

  • Create basic FastAPI application setup in backend/src/main.py
  • Implement configuration management (YAML/Environment variables) (FR-014)

• T009 Configure error handling and logging infrastructure (FR-010)

• T010 Implement in-memory background job processing mechanism (FR-008)

• T011 Implement rate limiting for external API calls (FR-009)

• T012 Integrate garth and garminconnect libraries (FR-019)

• T013 Reuse code/logic from @GarminAnalyser.md (FR-015)

Checkpoint: Foundation ready - user story implementation can now begin in parallel

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Phase 3: User Story 1 - Garmin Connect Activity Synchronization (Priority: P1) 🎯 MVP

Goal: Synchronize Garmin Connect activities and store them as FIT/GPX/TCX files in CentralDB.

Independent Test: Authenticate with Garmin Connect, trigger an activity sync via POST /api/sync/garmin/activities, and then verify that activity files are correctly stored in CentralDB, with only new or updated activities downloaded.

Implementation for User Story 1

• T015 [P] [US1] Define SyncJob Pydantic model for in-memory job tracking
• T016 [US1] Implement Garmin Activity Service for downloading activities (backend/src/services/garmin_activity_service.py) (FR-002)
• T017 [US1] Implement CentralDB storage for activity files (backend/src/services/central_db_service.py) (FR-003)
• T018 [US1] Implement activity synchronization logic (handling new/updated activities) (FR-002)
• T019 [US1] Create POST /api/sync/garmin/activities endpoint (backend/src/api/garmin_sync.py) (FR-006)
• T020 [US1] Implement background job for activity synchronization (FR-008)
• T021 [US1] Add error handling and retry logic for activity sync (FR-010)
• T022 [US1] Update in-memory SyncJob status and details (FR-011)

Checkpoint: At this point, User Story 1 should be fully functional and testable independently

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Phase 4: User Story 2 - Garmin Connect Health Metrics Synchronization (Priority: P2)

Goal: Synchronize Garmin Connect health metrics and store them in CentralDB.

Independent Test: Authenticate with Garmin Connect, trigger a sync, and verify that health metrics (e.g., heart rate, sleep data) are correctly synchronized and stored in CentralDB.

Implementation for User Story 2

• T024 [US2] Implement Garmin Health Metrics Service for downloading metrics (backend/src/services/garmin_health_service.py) (FR-004)
• T025 [US2] Implement CentralDB storage for health metrics (backend/src/services/central_db_service.py) (FR-004)
• T026 [US2] Implement health metrics synchronization logic
• T027 [US2] Integrate health metrics sync into in-memory SyncJob mechanism
• T028 [US2] Add error handling and retry logic for health metrics sync (FR-010)

Checkpoint: At this point, User Stories 1 AND 2 should both work independently

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Phase 5: User Story 3 - Garmin Workout Upload (Priority: P2)

Goal: Allow users to upload workouts from the application to Garmin Connect.

Independent Test: Create a workout in the application, initiate its upload to Garmin Connect, and then verify that the workout appears correctly on the user's Garmin Connect account.

Implementation for User Story 3

• T030 [US3] Implement Garmin Workout Service for uploading workouts (backend/src/services/garmin_workout_service.py) (FR-005)
• T031 [US3] Create POST /api/sync/garmin/workouts endpoint (backend/src/api/garmin_sync.py) (FR-005)
• T032 [US3] Implement background job for workout upload (FR-008)
• T033 [US3] Add error handling and retry logic for workout upload (FR-010)
• T034 [US3] Update in-memory SyncJob status and details for workout uploads

Checkpoint: All user stories should now be independently functional

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Phase 6: User Story 4 - Check Sync Status (Priority: P3)

Goal: Provide essential feedback to the user on ongoing and completed synchronization operations.

Independent Test: Trigger a synchronization process, then query the /api/sync/status endpoint to verify that it accurately reflects the ongoing or completed status of the sync.

Implementation for User Story 4

• T035 [US4] Implement SyncStatusService to query in-memory SyncJob records (backend/src/services/sync_status_service.py)
• T036 [US4] Create GET /api/sync/status endpoint (backend/src/api/garmin_sync.py) (FR-007)
• T037 [US4] Format and return synchronization status, progress, and error details

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Phase N: Polish & Cross-Cutting Concerns

Purpose: Improvements that affect multiple user stories

• T038 [P] Documentation updates in specs/002-intialspecv2/ (e.g., quickstart.md for new features)
• T039 Code cleanup and refactoring across services and API endpoints
• T040 Performance optimization (e.g., for large data syncs)
• T041 [P] Additional unit tests for new services and utilities in backend/tests/unit/
• T042 Security hardening (e.g., validation rules)
• T043 Run quickstart.md validation and update as necessary
• T044 Implement auth_token and refresh_token management (refreshing tokens before expiry)

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Dependencies & Execution Order

Phase Dependencies

• Setup (Phase 1): No dependencies - can start immediately
• Foundational (Phase 2): Depends on Setup completion - BLOCKS all user stories
• User Stories (Phase 3+): All depend on Foundational phase completion
  • User stories can then proceed in parallel (if staffed)
  • Or sequentially in priority order (P1 → P2 → P3)
• Polish (Final Phase): Depends on all desired user stories being complete

User Story Dependencies

• User Story 1 (P1): Can start after Foundational (Phase 2) - No dependencies on other stories
• User Story 2 (P2): Can start after Foundational (Phase 2) - May integrate with US1 but should be independently testable
• User Story 3 (P3): Can start after Foundational (Phase 2) - May integrate with US1/US2 but should be independently testable
• User Story 4 (P3): Can start after Foundational (Phase 2) - Depends on SyncJob from US1/US2/US3 to provide status

Within Each User Story

• Tests (if included) MUST be written and FAIL before implementation
• Services before endpoints
• Core implementation before integration
• Story complete before moving to next priority

Parallel Opportunities

• All Setup tasks marked [P] can run in parallel
• All Foundational tasks marked [P] can run in parallel (within Phase 2)
• Once Foundational phase completes, all user stories can start in parallel (if team capacity allows)
• All tests for a user story marked [P] can run in parallel
• Models within a story marked [P] can run in parallel
• Different user stories can be worked on in parallel by different team members

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Implementation Strategy

MVP First (User Story 1 Only)

1. Complete Phase 1: Setup
2. Complete Phase 2: Foundational (CRITICAL - blocks all stories)
3. Complete Phase 3: User Story 1
4. STOP and VALIDATE: Test User Story 1 independently
5. Deploy/demo if ready

Incremental Delivery

1. Complete Setup + Foundational → Foundation ready
2. Add User Story 1 → Test independently → Deploy/Demo (MVP!)
3. Add User Story 2 → Test independently → Deploy/Demo
4. Add User Story 3 → Test independently → Deploy/Demo
5. Add User Story 4 → Test independently → Deploy/Demo
6. Each story adds value without breaking previous stories

Parallel Team Strategy

With multiple developers:

1. Team completes Setup + Foundational together
2. Once Foundational is done:
   • Developer A: User Story 1
   • Developer B: User Story 2
   • Developer C: User Story 3
   • Developer D: User Story 4
3. Stories complete and integrate independently

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Notes

• [P] tasks = different files, no dependencies
• [Story] label maps task to specific user story for traceability
• Each user story should be independently completable and testable
• Verify tests fail before implementing
• Commit after each task or logical group
• Stop at any checkpoint to validate story independently
• Avoid: vague tasks, same file conflicts, cross-story dependencies that break independence