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specs/001-create-from-initialspec/checklists/requirements.md

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+# Specification Quality Checklist: Garmin Connect Synchronization Service
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2025-10-09
+**Feature**: [spec.md](../spec.md)
+
+## Content Quality
+
+- [x] No implementation details (languages, frameworks, APIs)
+- [x] Focused on user value and business needs
+- [x] Written for non-technical stakeholders
+- [x] All mandatory sections completed
+
+## Requirement Completeness
+
+- [x] No [NEEDS CLARIFICATION] markers remain
+- [x] Requirements are testable and unambiguous
+- [x] Success criteria are measurable
+- [x] Success criteria are technology-agnostic (no implementation details)
+- [x] All acceptance scenarios are defined
+- [x] Edge cases are identified
+- [x] Scope is clearly bounded
+- [x] Dependencies and assumptions identified
+
+## Feature Readiness
+
+- [x] All functional requirements have clear acceptance criteria
+- [x] User scenarios cover primary flows
+- [x] Feature meets measurable outcomes defined in Success Criteria
+- [x] No implementation details leak into specification
+
+## Notes
+
+- All validation checks passed. The specification is complete and meets quality standards.

specs/001-create-from-initialspec/spec.md

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+# 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**:
+
+1. **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.
+2. **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.
+3. **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**:
+
+1. **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.
+2. **Given** an activity has already been synchronized, **When** the sync runs again, **Then** the existing activity is not duplicated.
+3. **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**:
+
+1. **Given** my Garmin account is connected, **When** I choose to upload a workout, **Then** the workout is sent to my Garmin Connect calendar.
+2. **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).