# Graph Library Implementation Checklist

**For:** Hybrid Approach (ReactFlow + Sigma.js)
**Timeline:** 5 weeks
**Status:** Ready to Execute

---

## Pre-Implementation

### Decision Sign-Off
- [ ] Stakeholder approval on hybrid approach
- [ ] Budget approval ($20k)
- [ ] Timeline approval (5 weeks)
- [ ] Team assignment (1 senior frontend engineer)

### Technical Preparation
- [ ] Review [comprehensive comparison matrix](../../research/graph-libraries-comprehensive-comparison.md)
- [ ] Review [Sigma.js evaluation](../../research/sigma-js-evaluation.md)
- [ ] Review current ReactFlow implementation
- [ ] Set up performance baseline measurements

---

## Week 1: Foundation

### Day 1: Setup
- [ ] Install dependencies
  ```bash
  bun add sigma graphology @react-sigma/core
  bun add -d @types/sigma @types/graphology
  ```
- [ ] Create directory structure
  ```
  src/components/graph/
  ├── SigmaGraphView.tsx
  ├── GraphController.tsx
  └── renderers/
      ├── CustomNodeProgram.ts
      └── CustomEdgeProgram.ts
  src/lib/
  ├── graphology-adapter.ts
  └── graph-threshold.ts
  src/hooks/
  └── useGraphThreshold.ts
  ```

### Day 2: Graphology Integration
- [ ] Create Graphology adapter
  ```typescript
  // Convert ReactFlow nodes/edges to Graphology
  function toGraphology(nodes, edges): Graph
  function fromGraphology(graph): { nodes, edges }
  ```
- [ ] Test adapter with current data
- [ ] Create shared graph state hook

### Day 3: Threshold Detection
- [ ] Implement `useGraphThreshold` hook
  ```typescript
  const { useReactFlow, useSigma, threshold } = useGraphThreshold({
    threshold: 10000,
    nodes: nodes.length
  });
  ```
- [ ] Create `GraphController` component
- [ ] Add threshold boundary logic

### Day 4: Basic Sigma.js Rendering
- [ ] Create `SigmaGraphView` component
- [ ] Render simple circles for nodes
- [ ] Test with 1k, 10k, 50k node datasets
- [ ] Verify WebGL rendering works

### Day 5: Testing & Review
- [ ] Unit tests for adapters
- [ ] Integration test for threshold switching
- [ ] Performance baseline for Sigma.js
- [ ] Week 1 demo preparation

**Week 1 Deliverables:**
- ✅ Graphology adapter working
- ✅ Threshold detection implemented
- ✅ Basic Sigma.js rendering (circles only)
- ✅ Performance baseline established

---

## Week 2: Integration (Part 1)

### Day 1: Event Bridge Architecture
- [ ] Design event coordination system
  ```typescript
  type GraphEvent = 'click' | 'hover' | 'select' | 'drag';
  interface EventBridge {
    on(event: GraphEvent, handler: Function): void;
    emit(event: GraphEvent, data: any): void;
  }
  ```
- [ ] Create `useGraphEvents` hook
- [ ] Test event flow ReactFlow → Sigma

### Day 2: Click Events
- [ ] Implement node click in Sigma.js
  ```typescript
  sigma.on('clickNode', ({ node }) => {
    const attrs = graph.getNodeAttributes(node);
    onNodeClick(attrs);
  });
  ```
- [ ] Connect to existing node detail panel
- [ ] Test click on 10k+ nodes

### Day 3: Hover Events
- [ ] Implement node hover
- [ ] Show tooltip on hover
- [ ] Highlight connected edges
- [ ] Test hover performance

### Day 4: Selection
- [ ] Single node selection
- [ ] Multi-select with Ctrl/Cmd
- [ ] Selection state sync with Zustand
- [ ] Test selection with large graphs

### Day 5: Testing & Review
- [ ] Event integration tests
- [ ] Performance test (hover/click @ 50k)
- [ ] User acceptance testing
- [ ] Week 2 demo

**Week 2 Deliverables:**
- ✅ Click, hover, select events working
- ✅ Integration with existing UI
- ✅ Zustand state coordination
- ✅ Performance verified @ 50k nodes

---

## Week 3: Integration (Part 2)

### Day 1: Custom Node Renderer Setup
- [ ] Study Sigma.js custom programs
- [ ] Create base `CustomNodeProgram`
- [ ] Implement circle renderer
- [ ] Test basic custom rendering

### Day 2: Node Types
- [ ] Map ReactFlow node types to renderers
  ```typescript
  const renderers = {
    requirement: RequirementNodeProgram,
    task: TaskNodeProgram,
    defect: DefectNodeProgram,
    test: TestNodeProgram,
  };
  ```
- [ ] Implement icon rendering (texture atlas)
- [ ] Test type-specific rendering

### Day 3: Node Styling
- [ ] Color coding by type
- [ ] Size variations
- [ ] Selected/hover states
- [ ] Badge rendering (counts, status)

### Day 4: Edge Rendering
- [ ] Custom edge renderer
- [ ] Curved edges
- [ ] Edge labels (LOD-based)
- [ ] Edge highlighting

### Day 5: Testing & Review
- [ ] Visual regression tests
- [ ] Type-specific renderer tests
- [ ] Performance @ 100k nodes
- [ ] Week 3 demo

**Week 3 Deliverables:**
- ✅ Custom node renderers for all types
- ✅ Icon/badge rendering
- ✅ Custom edge renderer
- ✅ Visual parity with ReactFlow (simplified)

---

## Week 4: Optimization

### Day 1: LOD Implementation
- [ ] Define LOD levels (high/medium/low)
- [ ] Implement zoom-based LOD
  ```typescript
  const lod = camera.ratio < 0.5 ? 'high' :
              camera.ratio < 1.0 ? 'medium' : 'low';
  ```
- [ ] Simplify rendering at low LOD
- [ ] Test LOD transitions

### Day 2: Edge Optimization
- [ ] Edge bundling for dense graphs
- [ ] Hide edges when zoomed out
- [ ] Implement edge LOD
- [ ] Test with 100k edges

### Day 3: Performance Testing
- [ ] Benchmark suite
  - 1k nodes: Target 60 FPS
  - 10k nodes: Target 50 FPS
  - 50k nodes: Target 45 FPS
  - 100k nodes: Target 30 FPS
- [ ] Memory profiling
- [ ] CPU/GPU usage analysis

### Day 4: Memory Optimization
- [ ] Texture atlas optimization
- [ ] Buffer reuse
- [ ] Garbage collection testing
- [ ] Memory leak checks

### Day 5: Testing & Review
- [ ] Full performance test suite
- [ ] Browser compatibility testing
  - Chrome/Edge
  - Firefox
  - Safari
- [ ] Mobile testing (iOS/Android)
- [ ] Week 4 demo

**Week 4 Deliverables:**
- ✅ LOD system working
- ✅ Performance targets met
- ✅ Memory usage < 1GB @ 100k
- ✅ Cross-browser verified

---

## Week 5: Polish & Launch

### Day 1: Code Splitting
- [ ] Lazy load Sigma.js
  ```typescript
  const SigmaGraph = lazy(() => import('./SigmaGraphView'));
  ```
- [ ] Measure bundle size impact
- [ ] Test initial load time
- [ ] Verify progressive loading

### Day 2: UX Polish
- [ ] Loading states during transition
  ```typescript
  <Suspense fallback={<GraphSkeleton />}>
    <SigmaGraph />
  </Suspense>
  ```
- [ ] Smooth zoom transitions
- [ ] Error boundaries
- [ ] Fallback to ReactFlow on WebGL failure

### Day 3: Documentation
- [ ] Implementation guide
- [ ] API documentation
- [ ] Performance tuning guide
- [ ] Troubleshooting guide

### Day 4: A/B Testing Setup
- [ ] Feature flag configuration
  ```typescript
  const useHybrid = useFeatureFlag('graph-hybrid-renderer');
  ```
- [ ] Metrics collection
  - FPS tracking
  - Error rates
  - User engagement
- [ ] Rollout plan (10% → 50% → 100%)

### Day 5: Production Launch
- [ ] Final testing checklist
- [ ] Production deployment
- [ ] Monitoring setup
- [ ] Week 5 demo & retrospective

**Week 5 Deliverables:**
- ✅ Code splitting implemented
- ✅ UX polished
- ✅ Documentation complete
- ✅ Production deployed
- ✅ A/B testing live

---

## Post-Launch

### Week 6: Monitoring
- [ ] Daily performance checks
- [ ] User feedback collection
- [ ] Bug triage
- [ ] Success metrics review

### Week 7-8: Iteration
- [ ] Address user feedback
- [ ] Performance fine-tuning
- [ ] Edge case fixes
- [ ] Feature enhancements

---

## Acceptance Criteria

### Functional Requirements
- [ ] <10k nodes: ReactFlow rendering
- [ ] >10k nodes: Sigma.js rendering
- [ ] Automatic threshold switching
- [ ] All node types supported
- [ ] All edge types supported
- [ ] Click, hover, select events working
- [ ] Integration with existing UI (sidebars, panels)

### Performance Requirements
- [ ] 1k nodes: 60 FPS (ReactFlow)
- [ ] 10k nodes: 50 FPS (Sigma.js)
- [ ] 50k nodes: 45 FPS (Sigma.js)
- [ ] 100k nodes: 30 FPS (Sigma.js)
- [ ] Memory < 1GB @ 100k nodes
- [ ] Initial load time < 2s

### Quality Requirements
- [ ] Bundle size < 250KB (gzipped)
- [ ] Code coverage > 80%
- [ ] No accessibility regressions
- [ ] Cross-browser compatibility (Chrome, Firefox, Safari)
- [ ] Mobile support (iOS, Android)

### Documentation Requirements
- [ ] Implementation guide
- [ ] API documentation
- [ ] Performance tuning guide
- [ ] Migration guide (for future maintainers)

---

## Risk Mitigation

### Technical Risks
- [ ] WebGL not available → Fallback to ReactFlow
- [ ] Memory leak → Implement cleanup hooks
- [ ] Performance regression → Feature flag rollback
- [ ] Browser compatibility → Polyfills/fallbacks

### Schedule Risks
- [ ] Week 1 delay → Reduce Week 5 polish scope
- [ ] Week 2-3 delay → Skip Week 4 optimizations, launch MVP
- [ ] Major blocker → Abort, stay ReactFlow, document learnings

### Quality Risks
- [ ] Performance targets not met → Lower thresholds
- [ ] Visual regression → Keep ReactFlow for affected node types
- [ ] User complaints → A/B test shows preference → Rollback

---

## Success Metrics

### Technical Metrics
- FPS @ 5k nodes: 50+ (maintain)
- FPS @ 10k nodes: 45+ (improve)
- FPS @ 50k nodes: 45+ (enable)
- FPS @ 100k nodes: 30+ (enable)
- Memory @ 100k: <1GB
- Bundle size: <250KB

### Business Metrics
- User satisfaction: >80% positive feedback
- Error rate: <1% of sessions
- Adoption rate: 100% of users at 5 weeks
- Performance complaints: <5% of users

### Development Metrics
- Schedule: On time (5 weeks)
- Budget: On budget ($20k)
- Code quality: >80% coverage
- Technical debt: Minimal

---

## Team Communication

### Daily Standup
- What did I do yesterday?
- What will I do today?
- Any blockers?

### Weekly Demo
- Week 1: Threshold switching demo
- Week 2: Event integration demo
- Week 3: Custom renderers demo
- Week 4: Performance demo (100k nodes)
- Week 5: Production launch demo

### Stakeholder Updates
- Weekly email with:
  - Progress summary
  - Performance metrics
  - Risks/issues
  - Next week plan

---

## Tools & Resources

### Development Tools
- React DevTools (component profiling)
- Chrome Performance tab (FPS, memory)
- React Query Devtools (state inspection)
- Sigma.js Debugger (WebGL inspection)

### Testing Tools
- Vitest (unit tests)
- Playwright (E2E tests)
- Chromatic (visual regression)
- Lighthouse (performance audits)

### Documentation Tools
- TypeDoc (API docs)
- Storybook (component demos)
- Markdown (guides)

### External Resources
- [Sigma.js Docs](https://www.sigmajs.org/)
- [Graphology Docs](https://graphology.github.io/)
- [WebGL Fundamentals](https://webglfundamentals.org/)
- [ReactFlow Performance Guide](https://reactflow.dev/learn/advanced-use/performance)

---

## Contact & Escalation

### Team Lead
- Name: [TBD]
- Email: [TBD]
- Slack: [TBD]

### Stakeholders
- Product Owner: [TBD]
- Engineering Manager: [TBD]
- Architect: [TBD]

### Escalation Path
1. Technical blocker → Team Lead
2. Schedule risk → Engineering Manager
3. Scope change → Product Owner
4. Architecture decision → Architect

---

**Document Status:** ✅ Ready for Execution
**Next Action:** Kickoff meeting → Week 1 Day 1
**Owner:** [TBD]
**Last Updated:** 2026-02-01
