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FitTrack2/FitnessSync/specs/001-fitbit-garmin-sync/tasks.md
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Task list for Fitbit-Garmin Local Sync implementation

Tasks: Fitbit-Garmin Local Sync

Input: Design documents from /specs/001-fitbit-garmin-sync/ Prerequisites: plan.md (required), spec.md (required for user stories), research.md, data-model.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

  • Single project: src/, tests/ at repository root
  • Web app: backend/src/, frontend/src/
  • Mobile: api/src/, ios/src/ or android/src/
  • Paths shown below assume single project - adjust based on plan.md structure

Phase 1: Setup (Shared Infrastructure)

Purpose: Project initialization and basic structure

  • T001 Create project structure per implementation plan in backend/
  • T002 Initialize Python 3.11 project with FastAPI, SQLAlchemy, garminconnect, garth, fitbit dependencies in requirements.txt
  • T003 [P] Configure linting and formatting tools (black, flake8) in pyproject.toml

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

  • T004 Setup database schema and migrations framework using SQLAlchemy in backend/src/models/
  • T005 [P] Create base models (Configuration, API Token) in backend/src/models/config.py and backend/src/models/api_token.py
  • T006 [P] Setup API routing and middleware structure in backend/main.py
  • T007 Create database manager for PostgreSQL in backend/src/services/postgresql_manager.py
  • T008 Configure error handling and logging infrastructure in backend/src/utils/
  • T009 Setup environment configuration management in backend/src/utils/
  • T010 Create FastAPI app structure with proper routing in backend/main.py
  • T011 Setup Docker configuration with PostgreSQL in backend/Dockerfile and backend/docker-compose.yml

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

Phase 3: User Story 1 - Sync Weight Data from Fitbit to Garmin (Priority: P1) 🎯 MVP

Goal: User can transfer weight data from Fitbit to Garmin without duplicating entries, with a web interface to trigger the sync.

Independent Test: Can be fully tested by configuring Fitbit and Garmin credentials, triggering a weight sync, and verifying weight entries appear in Garmin without duplication. Delivers core value of unified health data.

Tests for User Story 1 (OPTIONAL - only if tests requested) ⚠️

NOTE: Write these tests FIRST, ensure they FAIL before implementation

  • T012 [P] [US1] Contract test for /api/sync/weight endpoint in backend/tests/contract/test_weight_sync.py
  • T013 [P] [US1] Integration test for weight sync flow in backend/tests/integration/test_weight_sync_flow.py

Implementation for User Story 1

  • T014 [P] [US1] Create Weight Record model in backend/src/models/weight_record.py
  • T015 [P] [US1] Create Sync Log model in backend/src/models/sync_log.py
  • T016 [US1] Implement Fitbit Client service in backend/src/services/fitbit_client.py
  • T017 [US1] Implement Garmin Client service in backend/src/services/garmin_client.py
  • T018 [US1] Implement weight sync logic in backend/src/services/sync_app.py
  • T019 [US1] Implement weight sync API endpoint in backend/src/api/sync.py
  • T020 [US1] Create status API endpoint in backend/src/api/status.py
  • T021 [US1] Add web UI for weight sync in backend/templates/index.html
  • T022 [US1] Add logging for weight sync operations in backend/src/utils/helpers.py

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

Phase 4: User Story 2 - Archive Activity Files from Garmin (Priority: P2)

Goal: User can download and archive Garmin activity files (.fit, .gpx, .tcx) to a local directory structure with proper organization.

Independent Test: Can be tested by triggering the activity archiving process and verifying original activity files are downloaded to the specified local directory with proper organization.

Tests for User Story 2 (OPTIONAL - only if tests requested) ⚠️

  • T023 [P] [US2] Contract test for /api/sync/activities endpoint in backend/tests/contract/test_activities_sync.py
  • T024 [P] [US2] Integration test for activity archiving flow in backend/tests/integration/test_activity_flow.py

Implementation for User Story 2

  • T025 [P] [US2] Create Activity Metadata model in backend/src/models/activity.py
  • T026 [US2] Extend Garmin Client service with activity download methods in backend/src/services/garmin_client.py
  • T027 [US2] Implement activity archiving logic in backend/src/services/sync_app.py
  • T028 [US2] Implement activity sync API endpoint in backend/src/api/sync.py
  • T029 [US2] Add activity list endpoint in backend/src/api/activities.py
  • T030 [US2] Update web UI to include activity archiving in backend/templates/index.html
  • T031 [US2] Add logging for activity archiving operations in backend/src/utils/helpers.py

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

Phase 5: User Story 3 - Download Comprehensive Health Metrics from Garmin (Priority: P3)

Goal: User can download and store comprehensive health metrics from Garmin in a local database with API endpoints for querying.

Independent Test: Can be tested by triggering the metrics download and verifying that various types of health metrics are stored in the database with proper timestamps and types.

Tests for User Story 3 (OPTIONAL - only if tests requested) ⚠️

  • T032 [P] [US3] Contract test for /api/metrics endpoints in backend/tests/contract/test_metrics_api.py
  • T033 [P] [US3] Integration test for health metrics download flow in backend/tests/integration/test_metrics_flow.py

Implementation for User Story 3

  • T034 [P] [US3] Create Health Metric model in backend/src/models/health_metric.py
  • T035 [US3] Extend Garmin Client service with comprehensive metrics download methods in backend/src/services/garmin_client.py
  • T036 [US3] Implement health metrics download logic in backend/src/services/sync_app.py
  • T037 [US3] Implement metrics list and query endpoints in backend/src/api/metrics.py
  • T038 [US3] Implement health data summary endpoint in backend/src/api/metrics.py
  • T039 [US3] Add UI elements for metrics management in backend/templates/
  • T040 [US3] Add logging for metrics download operations in backend/src/utils/helpers.py

Checkpoint: All user stories should now be independently functional

Phase 6: Setup API Endpoints for Configuration (Cross-cutting)

Goal: Implement configuration and authentication endpoints that support all user stories

  • T041 [P] Create setup API endpoints in backend/src/api/setup.py
  • T042 [P] Implement Garmin credentials save endpoint in backend/src/api/setup.py
  • T043 [P] Implement Fitbit credentials save and auth URL endpoint in backend/src/api/setup.py
  • T044 [P] Implement Fitbit OAuth callback endpoint in backend/src/api/setup.py
  • T045 Create logs endpoint in backend/src/api/logs.py
  • T046 Update UI with setup page in backend/templates/setup.html
  • T047 [P] Create auth status model in backend/src/models/auth_status.py
  • T048 [P] Create auth status API endpoint in backend/src/api/setup.py

Phase 7: Polish & Cross-Cutting Concerns

Purpose: Improvements that affect multiple user stories

  • T047 [P] Documentation updates in backend/README.md
  • T048 Code cleanup and refactoring
  • T049 Performance optimization across all stories
  • T050 [P] Additional unit tests (if requested) in backend/tests/unit/
  • T051 Security hardening for OAuth token storage and API access
  • T052 Run quickstart.md validation
  • T053 Final integration testing across all features
  • T054 Update Docker configuration with all required services
  • T055 Create setup guide in backend/docs/setup.md

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)
  • Configuration Phase (Phase 6): Can proceed in parallel with user stories but may be needed first
  • 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

Within Each User Story

  • Tests (if included) MUST be written and FAIL before implementation
  • Models before services
  • 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

Parallel Example: User Story 1

# Launch all tests for User Story 1 together (if tests requested):
Task: "Contract test for /api/sync/weight endpoint in backend/tests/contract/test_weight_sync.py"
Task: "Integration test for weight sync flow in backend/tests/integration/test_weight_sync_flow.py"

# Launch all models for User Story 1 together:
Task: "Create Weight Record model in backend/src/models/weight_record.py"
Task: "Create Sync Log model in backend/src/models/sync_log.py"

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. 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
  3. Stories complete and integrate independently

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
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