6.3 KiB
Feature Specification: Garmin Connect Synchronization Service
Feature Branch: 001-create-from-initialspec
Created: 2025-10-09
Status: Draft
Input: User description: "the feature description is in @initialspec.md"
User Scenarios & Testing (mandatory)
User Story 1 - Connect Garmin Account (Priority: P1)
As a single-app user, I want to securely connect my Garmin Connect account so that the application can access my fitness data.
Why this priority: This is the foundational step required for any data synchronization. Without it, no other feature can work.
Independent Test: Can be tested by initiating the connection process, authenticating with Garmin, and confirming the application shows a successful connection status. This delivers the core value of enabling data exchange.
Acceptance Scenarios:
- Given I am not connected to Garmin, When I choose to connect my Garmin account, Then I am securely redirected to a Garmin authentication page.
- Given I have successfully authenticated with Garmin, When I am redirected back to the application, Then the application shows that my account is successfully linked.
- Given I deny the authentication request on the Garmin page, When I am redirected back to the application, Then the application shows that the connection failed and allows me to try again.
User Story 2 - Synchronize Activities (Priority: P1)
As a connected user, I want the application to automatically download my latest activities (like runs, rides) from Garmin so my fitness dashboard is always up-to-date.
Why this priority: This is the primary purpose of the synchronization service, providing users with their core fitness data.
Independent Test: Can be tested by having a connected Garmin account with recent activities, triggering a sync, and verifying that the new activities appear within the application's database.
Acceptance Scenarios:
- Given my Garmin account is connected and has recent activities, When a synchronization event is triggered, Then the new activities are downloaded and stored by the application.
- Given an activity has already been synchronized, When the sync runs again, Then the existing activity is not duplicated.
- Given I manually trigger a sync, When the process starts, Then I can view the current status of the synchronization (e.g., "In Progress", "Completed", "Failed").
User Story 3 - Upload Workouts (Priority: P2)
As a connected user, I want to be able to upload a planned workout from the application to my Garmin Connect calendar so I can use it on my device.
Why this priority: This enables a two-way integration, allowing users to manage their training plans within the application and execute them on their Garmin devices.
Independent Test: Can be tested by creating a workout in the application, triggering the upload, and verifying the workout appears in the user's Garmin Connect calendar.
Acceptance Scenarios:
- Given my Garmin account is connected, When I choose to upload a workout, Then the workout is sent to my Garmin Connect calendar.
- Given the workout fails to upload due to a connection issue, When the process fails, Then I am notified of the failure with a clear error message.
Edge Cases
- What happens if the user revokes access to the application from their Garmin Connect account settings?
- How does the system handle rate limits imposed by the Garmin API to avoid being blocked?
- What happens if a synchronization job is interrupted midway (e.g., server restart)?
- How are data conflicts resolved if data is modified in both places between syncs?
Requirements (mandatory)
Functional Requirements
- FR-001: System MUST allow a user to securely connect their Garmin Connect account.
- FR-002: System MUST be able to store and manage authentication tokens for the connected Garmin account, including securely handling refresh tokens.
- FR-003: System MUST download and store a user's activities from their Garmin account.
- FR-004: System MUST provide a mechanism to manually trigger a data synchronization with Garmin.
- FR-005: System MUST provide a way for the user to check the status of an ongoing or completed synchronization.
- FR-006: System MUST be able to upload a user's planned workouts to their Garmin Connect calendar.
- FR-007: System MUST synchronize user health metrics from Garmin, including Daily Summary (Steps, Resting Heart Rate, Sleep), VO2 Max, Heart Rate Zones, FTP Zones, and Max Heart Rate.
- FR-008: All synchronization processes MUST run in the background to not block the user interface.
- FR-009: The system's interaction with the Garmin API MUST be rate-limited to prevent exceeding API quotas.
- FR-010: The system MUST include error handling and retry logic for failed API requests to Garmin.
- FR-011: The system MUST maintain a history of synchronization events and their outcomes.
Key Entities (include if feature involves data)
- User Account: Represents the single user of the application.
- Garmin Connection: Stores the authentication tokens and connection status for a user's Garmin account.
- Activity: Represents a fitness activity (e.g., run, cycle) with its associated data (e.g., distance, time, location data).
- Workout: Represents a planned workout to be executed by the user.
- Health Metric: Represents a specific point-in-time or daily health measurement (e.g., daily steps, resting heart rate).
- Sync Job: Represents a single synchronization process, its status, and history.
Success Criteria (mandatory)
Measurable Outcomes
- SC-001: 99% of synchronization requests should be successfully processed within 5 minutes of being initiated.
- SC-002: Users can connect their Garmin account in under 60 seconds.
- SC-003: The system must be able to handle and store at least 10 years of activity data for a single user without performance degradation.
- SC-004: The synchronization process must accurately reflect the user's data from Garmin with a data discrepancy rate of less than 0.1%.
- SC-005: No user-facing errors should occur during the background synchronization process. The user should only see the final status (Success/Failure).