go-garminconnect/PORTING_PLAN.md

Go Porting Implementation Plan

Project Structure

/go-garminconnect
├── cmd/            # CLI example applications
├── garminconnect/  # Core API wrapper package
├── fit/            # FIT encoding package
├── internal/       # Internal helpers and utilities
├── examples/       # Example usage
├── PORTING_PLAN.md
├── JUNIOR_ENGINEER_GUIDE.md
└── README.md

Phase Implementation Details

Phase 1: Setup & Core Structure

• Initialize Go module: go mod init github.com/sstent/go-garminconnect
• Create directory structure
• Set up CI/CD pipeline
• Create Makefile with build/test targets
• Add basic README with project overview

Phase 2: Authentication Implementation

• Implement OAuth2 authentication flow
• Create token storage interface
• Implement session management with auto-refresh
• Handle MFA authentication
• Test against sandbox environment

Phase 3: API Client Core

• Create Client struct with configuration
• Implement generic request handler
• Add automatic token refresh
• Implement rate limiting
• Set up connection pooling
• Create response parsing utilities

Phase 4: Endpoint Implementation

Health Data Endpoints

• Body composition
• Sleep data
• Heart rate/HRV/RHR
• Stress data
• Body battery

Activity Endpoints

• Activity list/search
• Activity details
• Activity upload/download
• Gear management

User Data Endpoints

• User summary
• Daily stats
• Goals/badges

Phase 5: FIT Handling

• Port FIT encoder from Python
• Implement weight composition encoding
• Create streaming FIT encoder
• Add FIT parser

Phase 6: Testing & Quality

• Table-driven endpoint tests
• Mock server implementation
• FIT golden file tests
• Performance benchmarks
• Static analysis integration

Phase 7: Documentation & Examples

• Complete GoDoc coverage
• Create usage examples
• Build CLI example app
• Write migration guide

Weekly Milestones

Week	Focus Area	Key Deliverables
1	Setup + Auth	Auth working, CI green
2	Core + Health	40% test coverage, health endpoints
3	Activity + User	All endpoints implemented
4	FIT Handling	FIT encoding complete, 85% coverage
5	Documentation	Examples, guides, v1.0 release