# Feature Specification: IntialSpecV2 **Feature Branch**: `feature/intial-spec-v2` **Created**: 2025-10-09 **Status**: Draft **Input**: User description: "Create a detailed feature specification based on the provided context." ## User Scenarios & Testing *(mandatory)* ### User Story 1 - Garmin Connect Activity Synchronization (Priority: P1) As a user, I want to authenticate with Garmin Connect and have my activities (FIT, GPX, TCX files) downloaded and stored in CentralDB so that I can track my fitness data. **Why this priority**: This is a core function for the GarminSync service, enabling fundamental data collection. **Independent Test**: Can be fully tested by authenticating with Garmin Connect, triggering an activity sync, and then verifying that activity files are correctly stored in CentralDB. **Acceptance Scenarios**: 1. **Given** a user has successfully authenticated with Garmin Connect, **When** they trigger an activity sync via `POST /api/sync/garmin/activities`, **Then** their recent activities are downloaded from Garmin Connect and stored as FIT/GPX/TCX files in CentralDB. 2. **Given** a user has authenticated with Garmin Connect, **When** a sync is triggered, **Then** only new or updated activities are downloaded to avoid redundant data. --- ### User Story 2 - Garmin Connect Health Metrics Synchronization (Priority: P2) As a user, I want my health metrics to be synchronized from Garmin Connect to CentralDB so I can have a comprehensive view of my health data. **Why this priority**: Important for a holistic view of user health, complementing activity data. **Independent Test**: Can be fully tested by authenticating with Garmin Connect, triggering a sync, and verifying that health metrics (e.g., heart rate, sleep data) are correctly synchronized and stored in CentralDB. **Acceptance Scenarios**: 1. **Given** a user has successfully authenticated with Garmin Connect, **When** they trigger a sync, **Then** their health metrics are synchronized from Garmin Connect to CentralDB. --- ### User Story 3 - Garmin Workout Upload (Priority: P2) As a user, I want to be able to upload workouts from the application to Garmin Connect. **Why this priority**: This provides bidirectional sync functionality, enhancing the utility of the service. **Independent Test**: Can be fully tested by creating a workout in the application, initiating its upload to Garmin Connect, and then verifying that the workout appears correctly on the user's Garmin Connect account. **Acceptance Scenarios**: 1. **Given** a user has a workout defined within the application, **When** they initiate the workout upload to Garmin, **Then** the workout is successfully transmitted and appears on their Garmin Connect account. --- ### User Story 4 - Check Sync Status (Priority: P3) As a user, I want to be able to check the status of my synchronization processes. **Why this priority**: Provides essential feedback to the user on ongoing and completed operations, improving user experience. **Independent Test**: Can be fully tested by triggering a synchronization process, then querying the `/api/sync/status` endpoint to verify that it accurately reflects the ongoing or completed status of the sync. **Acceptance Scenarios**: 1. **Given** a synchronization process is in progress, **When** the user makes a `GET` request to `/api/sync/status`, **Then** the system returns the current status of the synchronization, including any progress or errors. 2. **Given** a synchronization process has completed, **When** the user makes a `GET` request to `/api/sync/status`, **Then** the system returns the final status of the synchronization, including success or failure details. --- ### Edge Cases - What happens when the Garmin Connect API is unavailable or returns an error during activity or health metrics synchronization? - How does the system handle exceeding rate limits imposed by the Garmin Connect API? - What is the behavior of the system if CentralDB is unavailable or encounters an error during data storage operations? - How does the system respond if a user revokes the OAuth2 authentication for Garmin Connect? - What happens if there are conflicts between existing data in CentralDB and incoming data from Garmin Connect during synchronization? ## Requirements *(mandatory)* ### Functional Requirements - **FR-001**: System MUST support Garmin Connect username and password authentication for user authorization. - **FR-002**: System MUST download activity files (FIT, GPX, TCX) from Garmin Connect. - **FR-003**: System MUST store downloaded activity files in CentralDB. - **FR-004**: System MUST synchronize health metrics data from Garmin Connect to CentralDB. - **FR-005**: System MUST allow users to upload workouts to Garmin Connect. - **FR-006**: System MUST provide a `POST /api/sync/garmin/activities` API endpoint to trigger activity synchronization. - **FR-007**: System MUST provide a `GET /api/sync/status` API endpoint to check the current status of synchronization processes. - **FR-008**: System MUST process all synchronization tasks as background jobs to ensure responsiveness. - **FR-009**: System MUST implement rate limiting mechanisms for all external API calls, especially to Garmin Connect. - **FR-010**: System MUST include robust error handling and retry logic for transient failures during external API interactions and CentralDB operations. - **FR-011**: System MUST maintain a history of synchronization events and provide mechanisms for conflict resolution using CentralDB. - **FR-012**: The application MUST be designed as a single-user system. - **FR-013**: The service MUST default to listening on port 8001. - **FR-014**: System MUST support configuration via YAML files or environment variables. - **FR-015**: System MUST reuse existing code and logic from @GarminAnalyser.md for Garmin integration where applicable. - **FR-016**: System MUST utilize CentralDB for all persistent storage, including user authentication tokens (e.g., username and password hashes). - **FR-019**: System WILL leverage the `garth` and `garminconnect` libraries for Garmin Connect integration, particularly for handling authentication and data synchronization. - **FR-017**: System MUST integrate with the CentralDB API as defined in @DB_API_SPEC.json (with the ability to refresh the spec from `http://localhost:8000/openapi.json`). - **FR-018**: System SHOULD support Fitbit weight data synchronization in a future iteration. ### Key Entities *(include if feature involves data)* - **User**: The single authenticated individual utilizing the GarminSync service. - **Garmin Connect Account**: Represents the user's linked Garmin account, storing OAuth2 tokens and other necessary authentication credentials. - **Activity**: A record of a fitness activity (e.g., running, cycling) obtained from Garmin Connect, encompassing raw data files (FIT, GPX, TCX) and metadata. - **Health Metric**: A data point representing a user's health measurement (e.g., heart rate, sleep data, body composition) synchronized from Garmin Connect. - **Workout**: A structured training plan or session that can be uploaded to Garmin Connect. - **Sync Job**: An instance of a synchronization operation (e.g., activity sync, health metrics sync), tracking its status, progress, and any associated errors. ## Success Criteria *(mandatory)* ### Measurable Outcomes - **SC-001**: 95% of all triggered Garmin Connect activity synchronizations complete successfully within 5 minutes. - **SC-002**: Garmin Connect OAuth2 authentication process completes successfully for 100% of first-time users. - **SC-003**: The `GET /api/sync/status` endpoint returns an accurate synchronization status within 5 seconds of being queried. - **SC-004**: Data stored in CentralDB (activities, health metrics, tokens) maintains 99.9% integrity and availability. - **SC-005**: Workout uploads to Garmin Connect succeed for 98% of attempts.