# Google Contacts & Calendar Sync - Documentation Index
**Version**: 1.0.0
**Date**: 2025-10-09
**Status**: ā
Design Complete, Ready for Implementation
## š Documentation Overview
This index provides a complete navigation guide to all Google Sync architecture and implementation documentation.
---
## šÆ Start Here
### For Product Managers
š **[GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md)**
- Executive summary
- Feature overview
- Success metrics
- Risk assessment
- Timeline and effort estimates
### For Engineers (New to Project)
š **[GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md)**
- 30-minute setup guide
- Google Cloud configuration
- Environment setup
- First sync test
- Common issues & solutions
### For Engineers (Starting Implementation)
š **[GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md)**
- Phased implementation roadmap (4-5 weeks)
- Code samples for all components
- Testing strategy
- Deployment checklist
---
## š Core Documentation
### 1. Architecture & Design
#### [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md)
**Purpose**: Complete technical architecture specification
**Contents**:
- Core design principles
- Google Contacts sync architecture (incremental + full)
- Google Calendar weekly tracking
- OAuth 2.0 service design
- Database schema updates
- Code structure and integration
- Error handling strategy
- Testing strategy
**Audience**: Senior engineers, architects
**Estimated Reading Time**: 45 minutes
---
#### [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md)
**Purpose**: Detailed sequence diagrams for all flows
**Contents**:
- OAuth 2.0 flow (initiation + callback)
- Google Contacts incremental sync
- Google Contacts full sync (fallback)
- Google Calendar weekly sync
- Error recovery flows (rate limits, token expiry, network errors)
- Conflict resolution flow
**Audience**: Engineers, QA, architects
**Estimated Reading Time**: 30 minutes
---
#### [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md)
**Purpose**: Visual architecture diagrams
**Contents**:
- System architecture overview
- Data flow diagrams (OAuth, import, export, calendar)
- Component relationships
- Error flow & recovery
- Performance optimization layers
- Security architecture
- Deployment topology
**Audience**: All technical stakeholders
**Estimated Reading Time**: 20 minutes
---
### 2. Implementation Guides
#### [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md)
**Purpose**: Phased implementation roadmap
**Contents**:
- **Phase 1**: OAuth Infrastructure (Week 1)
- **Phase 2**: Google Contacts Sync (Week 2-3)
- **Phase 3**: Google Calendar Tracking (Week 4)
- **Phase 4**: Testing & Refinement (Week 5)
- Complete code samples
- Testing checklist
- Deployment guide
**Audience**: Implementing engineers
**Estimated Reading Time**: 60 minutes
---
#### [GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md)
**Purpose**: 30-minute developer onboarding
**Contents**:
- Google Cloud setup (10 min)
- Environment configuration (5 min)
- Database migration (5 min)
- OAuth flow test (5 min)
- Test contacts sync (5 min)
- Test calendar sync (5 min)
- Common issues & solutions
- Quick reference commands
**Audience**: New developers, QA
**Estimated Reading Time**: 30 minutes (hands-on)
---
### 3. Summary & Reference
#### [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md)
**Purpose**: Executive summary and quick reference
**Contents**:
- Architecture highlights
- Implementation roadmap
- Code reuse analysis (70% existing, 30% new)
- Error handling strategy
- Performance considerations
- Security considerations
- Success metrics & KPIs
- Risk mitigation
- File checklist (36 files)
**Audience**: All stakeholders
**Estimated Reading Time**: 25 minutes
---
## šļø Document Relationships
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ā ā IMPLEMENTATION_PLAN ā ā
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ā āā Architecture āāāāāāāāāā ā
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ā āā Sequence Diagrams āāāāā ā
ā ā GOOGLE_SYNC_FLOWS ā ā
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```
---
## š Reading Paths
### Path 1: Product Manager
**Goal**: Understand features, timeline, and risks
1. **[GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md)** (25 min)
- Architecture highlights
- Implementation roadmap
- Success metrics
- Risk mitigation
2. **[GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md)** (20 min)
- Visual system overview
- Data flows
- Deployment options
**Total Time**: 45 minutes
---
### Path 2: New Engineer (Starting Development)
**Goal**: Set up environment and run first sync
1. **[GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md)** (30 min hands-on)
- Google Cloud setup
- Environment config
- First sync test
2. **[GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md)** (60 min)
- Phase-by-phase guide
- Code samples
- Testing checklist
3. **[GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md)** (45 min)
- Deep technical details
- Design patterns
- Integration points
**Total Time**: 2.25 hours
---
### Path 3: Architect / Senior Engineer
**Goal**: Understand design decisions and implementation strategy
1. **[GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md)** (45 min)
- Complete architecture
- Design patterns
- Code structure
2. **[GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md)** (30 min)
- Sequence diagrams
- Error recovery
- Edge cases
3. **[GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md)** (60 min)
- Implementation phases
- Code samples
- Performance optimization
**Total Time**: 2.25 hours
---
### Path 4: QA Engineer
**Goal**: Understand testing strategy and edge cases
1. **[GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md)** (30 min)
- Environment setup
- Basic testing
2. **[GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md)** (30 min)
- Error scenarios
- Recovery flows
3. **[GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md)** - Testing section (20 min)
- Unit test strategy
- Integration tests
- E2E scenarios
**Total Time**: 1.5 hours
---
## š Key Concepts
### OAuth 2.0 Flow
- **Where**: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#4-oauth-20-service-design)
- **Diagram**: [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md#1-oauth-20-flow)
- **Implementation**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#phase-1-oauth-infrastructure-week-1)
### Incremental Sync (syncToken)
- **Where**: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#22-contact-sync-service)
- **Diagram**: [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md#2-google-contacts-incremental-sync)
- **Code**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#21-google-people-api-client)
### LLM Deduplication
- **Where**: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#22-contact-sync-service)
- **Diagram**: [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md#component-relationships)
- **Reuse**: Existing `batchCheckDuplicates()` from macOS sync
### Weekly Calendar Tracking
- **Where**: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#3-google-calendar-weekly-tracking)
- **Diagram**: [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md#4-google-calendar-weekly-sync)
- **Implementation**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#phase-3-google-calendar-tracking-week-4)
### Error Recovery
- **Where**: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#7-error-handling-strategy)
- **Diagram**: [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md#5-error-recovery-flows)
- **Visual**: [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md#error-flow--recovery)
---
## š Quick Statistics
### Implementation Metrics
| Metric | Value | Source |
|--------|-------|--------|
| **Total Files** | 36 files | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#appendix-file-checklist) |
| **Lines of Code** | ~2,500 LOC | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#code-reuse-analysis) |
| **Code Reuse** | 70% existing | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#code-reuse-analysis) |
| **New Code** | 30% (1,350 LOC) | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#code-reuse-analysis) |
| **Implementation Time** | 4-5 weeks | [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#summary) |
| **Test Coverage Target** | 95% | [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#8-testing-strategy) |
### Performance Targets
| Operation | Target | Source |
|-----------|--------|--------|
| 1000 contacts sync | < 30 seconds | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#performance-considerations) |
| Incremental sync | 50-200ms | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#performance-considerations) |
| Calendar week sync | < 10 seconds | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#performance-considerations) |
| Token refresh | < 500ms | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#performance-considerations) |
| LLM deduplication | < 5s per 100 pairs | [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#performance-considerations) |
---
## š Implementation Phases
### Phase 1: OAuth Infrastructure (Week 1)
- **Guide**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#phase-1-oauth-infrastructure-week-1)
- **Files**: 7 files
- **Key Deliverable**: Working OAuth flow with token storage
### Phase 2: Google Contacts Sync (Week 2-3)
- **Guide**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#phase-2-google-contacts-sync-week-2-3)
- **Files**: 15 files
- **Key Deliverable**: Bidirectional sync with LLM deduplication
### Phase 3: Google Calendar Tracking (Week 4)
- **Guide**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#phase-3-google-calendar-tracking-week-4)
- **Files**: 8 files
- **Key Deliverable**: Weekly calendar event tracking
### Phase 4: Testing & Refinement (Week 5)
- **Guide**: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#phase-4-testing--refinement-week-5)
- **Files**: 6 files (tests + docs)
- **Key Deliverable**: Production-ready deployment
---
## š Search Guide
### Find Information By Topic
**OAuth Configuration**:
- Setup: [GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md#step-1-google-cloud-setup-10-minutes)
- Architecture: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#4-oauth-20-service-design)
- Flow Diagram: [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md#1-oauth-20-flow)
**Database Schema**:
- Design: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#5-database-schema-updates)
- Migration: [GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md#step-3-database-migration-5-minutes)
- DDL: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#31-database-migration)
**Error Handling**:
- Strategy: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#7-error-handling-strategy)
- Flows: [GOOGLE_SYNC_FLOWS.md](./GOOGLE_SYNC_FLOWS.md#5-error-recovery-flows)
- Visual: [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md#error-flow--recovery)
**Testing**:
- Strategy: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#8-testing-strategy)
- Implementation: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#testing-checklist)
- Quickstart: [GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md#step-5-test-google-contacts-sync-5-minutes)
**Performance**:
- Targets: [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#performance-considerations)
- Optimization: [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md#performance-optimization-points)
- Benchmarks: [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#performance-tests)
**Security**:
- Considerations: [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md#security-considerations)
- Architecture: [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md#security-architecture)
- OAuth: [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md#41-oauth-service-interface)
---
## š Contributing to Documentation
### Adding New Documents
When adding new documentation, update this index with:
1. **Document link and purpose**
2. **Contents summary**
3. **Target audience**
4. **Estimated reading time**
5. **Relationships to existing docs**
### Documentation Standards
- Use clear, concise language
- Include code examples where relevant
- Add sequence diagrams for complex flows
- Reference other docs for cross-cutting concerns
- Keep summaries up-to-date
---
## š Learning Resources
### External References
**Google APIs**:
- [Google People API Docs](https://developers.google.com/people)
- [Google Calendar API Docs](https://developers.google.com/calendar)
- [OAuth 2.0 Guide](https://developers.google.com/identity/protocols/oauth2)
**Project Patterns**:
- Existing macOS Contacts Sync: `src/cli/commands/contacts-sync.ts`
- Existing Gmail Client: `src/integrations/gmail-client.ts`
- LLM Deduplication: `src/utils/deduplication.ts`
- UUID Matching: `src/utils/contact-matching.ts`
---
## ā
Getting Started Checklist
### Before You Begin
- [ ] Read [GOOGLE_SYNC_SUMMARY.md](./GOOGLE_SYNC_SUMMARY.md) for overview
- [ ] Complete [GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md) setup
- [ ] Review [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md) for design
- [ ] Check [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md) for roadmap
### During Implementation
- [ ] Follow phase-by-phase guide
- [ ] Reference sequence diagrams for flows
- [ ] Use quickstart for debugging
- [ ] Track progress against checklist
### Before Deployment
- [ ] Complete all testing checklists
- [ ] Review security considerations
- [ ] Verify performance targets
- [ ] Update production environment
---
## š Support
**Questions about architecture?**
ā Review [GOOGLE_SYNC_ARCHITECTURE.md](./GOOGLE_SYNC_ARCHITECTURE.md) or ask in #architecture channel
**Implementation issues?**
ā Check [GOOGLE_SYNC_QUICKSTART.md](../guides/GOOGLE_SYNC_QUICKSTART.md#common-issues--solutions)
**Need visual reference?**
ā See diagrams in [GOOGLE_SYNC_DIAGRAM.md](./GOOGLE_SYNC_DIAGRAM.md)
**Testing questions?**
ā Review testing sections in [GOOGLE_SYNC_IMPLEMENTATION_PLAN.md](../guides/GOOGLE_SYNC_IMPLEMENTATION_PLAN.md#testing-checklist)
---
## š
Document Status
| Document | Status | Last Updated | Next Review |
|----------|--------|--------------|-------------|
| GOOGLE_SYNC_ARCHITECTURE.md | ā
Complete | 2025-10-09 | After Phase 1 |
| GOOGLE_SYNC_FLOWS.md | ā
Complete | 2025-10-09 | After Phase 1 |
| GOOGLE_SYNC_DIAGRAM.md | ā
Complete | 2025-10-09 | After Phase 1 |
| GOOGLE_SYNC_SUMMARY.md | ā
Complete | 2025-10-09 | After Phase 1 |
| GOOGLE_SYNC_IMPLEMENTATION_PLAN.md | ā
Complete | 2025-10-09 | Weekly during implementation |
| GOOGLE_SYNC_QUICKSTART.md | ā
Complete | 2025-10-09 | After first developer onboarding |
| GOOGLE_SYNC_INDEX.md | ā
Complete | 2025-10-09 | Monthly |
---
**Architecture Status**: ā
Complete and Ready for Implementation
**Next Steps**:
1. Stakeholder review and approval
2. Google Cloud setup
3. Begin Phase 1: OAuth Infrastructure
---
*This index is maintained by the architecture team. For updates or corrections, please submit a PR or contact the team lead.*
