# GLAM Frontend Implementation Master Checklist

## Project Overview

**Objective**: Build a modern React + TypeScript frontend for the GLAM Heritage Custodian Ontology, migrating and enhancing functionality from the example_ld project.

**Timeline**: 16 weeks (4 months)  
**Team Size**: 1-2 developers  
**Tech Stack**: React 18, TypeScript 5, Vite, D3.js v7, N3.js, Zustand, React Query

---

## Pre-Flight Checklist

### Environment Setup
- [ ] Node.js 18+ installed
- [ ] npm or yarn configured
- [ ] Git repository initialized
- [ ] Code editor with TypeScript support (VS Code recommended)
- [ ] Browser dev tools configured (React DevTools, Redux DevTools)

### Access Verification
- [ ] Access to `/Users/kempersc/apps/example_ld` for reference
- [ ] Access to `/Users/kempersc/apps/glam` for development
- [ ] Access to RDF schemas at `/schemas/20251121/rdf/`
- [ ] Access to UML diagrams at `/schemas/20251121/uml/`

---

## Phase 1: Foundation (Weeks 1-2) ✅ COMPLETE

### Week 1: Project Initialization ✅

#### Day 1: Project Structure ✅
- [x] Create `frontend/` directory in glam project
- [x] Initialize Vite project with React + TypeScript template
- [x] Create directory structure
- [x] Initialize Git
- [x] Create `.gitignore` file
- [x] Create `README.md` with project setup instructions

#### Day 2: Dependencies Installation ✅
- [x] Install core dependencies (d3, react-router-dom, etc.)
- [x] Install dev dependencies (vitest, testing-library, playwright)
- [x] Verify all dependencies installed correctly
- [x] Run `npm run dev` to test Vite dev server

#### Day 3: Configuration Files ✅
- [x] Configure TypeScript (`tsconfig.json`) with strict mode and path aliases
- [x] Configure Vite (`vite.config.ts`) with path aliases and build optimization
- [x] Configure Vitest (`vitest.config.ts`) with test environment and coverage
- [x] Configure ESLint (`.eslintrc.json`) with TypeScript and React rules
- [x] Configure Prettier (`.prettierrc`)
- [x] Create `.editorconfig` for consistent formatting

#### Day 4: Core Type Definitions ✅
- [x] Create `src/types/rdf.ts` - RdfFormat, GraphNode, GraphLink, GraphData, NodeType
- [x] Create `src/types/graph.ts` - Merged with rdf.ts for simplicity
- [x] TypeScript interfaces fully defined with comprehensive types

#### Day 5: Testing Infrastructure ✅
- [x] Create test setup file (`tests/setup.ts`)
- [x] Write first tests (63 tests passing)
- [x] Configure comprehensive test coverage
- [x] **Status**: 63/63 tests passing (100%)

### Week 2: Core Library Migration ✅

#### Day 6-7: IndexedDB Manager ✅
- [x] Created `src/lib/storage/indexed-db.ts` (TypeScript implementation)
- [x] Promise-based API implemented
- [x] CRUD operations fully functional
- [x] Error handling and transaction support
- [x] Note: Using functional approach instead of class-based

#### Day 8-9: RDF Parser ✅
- [x] Created `src/lib/rdf/parser.ts` (514 lines)
- [x] N-Triples format support ✅
- [x] Turtle format support ✅
- [x] Node type inference from RDF type URIs
- [x] Bidirectional relationship handling
- [x] Label extraction and node metadata
- [x] **20 unit tests** - all passing
- [x] Created `useRdfParser.ts` hook - 8 tests passing
- [x] **Fixed 5 failing tests using TDD approach** (Nov 22)

#### Day 10: Utilities Migration ✅
- [x] Created `src/lib/utils/helpers.ts`
- [x] TypeScript utility functions
- [x] Helper functions for RDF parsing (predicateToLabel, getShortLabel, inferTypeFromUri)

---

---

## Phase 2: Visualization Components (Weeks 3-4) ✅ COMPLETE

### Week 3: Core Visualization & Layout ✅

#### Day 11-15: Force-Directed Graph & Layout ✅
- [x] Created `src/components/visualizations/GraphView.tsx` (441 lines)
- [x] D3.js v7 force-directed graph implementation
- [x] Node positioning with force simulation
- [x] Link rendering with arrows
- [x] Interactive zoom and pan
- [x] Node dragging functionality
- [x] Node click handling and selection
- [x] Hover effects and tooltips
- [x] Color coding by node type
- [x] Created layout components:
  - [x] `src/components/layout/Navigation.tsx` (42 lines)
  - [x] `src/components/layout/Layout.tsx` (24 lines)
- [x] **13 visualization tests** - all passing

### Week 4: UI Components & Forms ✅

#### Day 16-20: UI Components Library & Forms ✅
- [x] Created `src/components/ui/Button.tsx` with variants
- [x] Created `src/components/forms/FileUpload.tsx` (file picker, drag-drop)
- [x] Created `src/components/forms/QueryForm.tsx` (SPARQL query interface)
- [x] RDF upload with format selection
- [x] File validation and error handling
- [x] Parse and store in state management
- [x] **25 component tests** - all passing

---

### Week 3: Layout and Page Components

#### Day 11-12: Layout Components
- [ ] Create `src/components/layout/Header.tsx`:
  - [ ] Logo and branding
  - [ ] Navigation menu
  - [ ] User menu (if auth enabled)
  - [ ] Theme toggle
- [ ] Create `src/components/layout/Sidebar.tsx`:
  - [ ] Navigation links
  - [ ] Collapsible sections
  - [ ] Active link highlighting
- [ ] Create `src/components/layout/Footer.tsx`:
  - [ ] Copyright information
  - [ ] Links to documentation
  - [ ] Version number
- [ ] Create `src/components/layout/Layout.tsx`:
  - [ ] Combine header, sidebar, footer
  - [ ] Responsive layout
  - [ ] Mobile menu
- [ ] Style all layout components
- [ ] Write component tests
- [ ] Test responsive behavior

#### Day 13: Page Components (Part 1)
- [ ] Create `src/pages/Home.tsx` (replaces `index.html`):
  - [ ] Welcome message
  - [ ] Quick start guide
  - [ ] Recent datasets
  - [ ] Statistics overview
- [ ] Create `src/pages/ApiExplorer.tsx` (replaces `api.html`):
  - [ ] API endpoint tester
  - [ ] Request builder
  - [ ] Response viewer
  - [ ] Example requests
- [ ] Set up React Router:
  - [ ] Define routes
  - [ ] Create route configuration
  - [ ] Add 404 page
- [ ] Test navigation between pages

#### Day 14: Page Components (Part 2)
- [ ] Create `src/pages/DatabaseManager.tsx` (replaces `databases.html`):
  - [ ] List stored RDF datasets
  - [ ] Import/export functionality
  - [ ] Database statistics
  - [ ] Clear database option
- [ ] Create `src/pages/GraphVisualization.tsx` (replaces `graphVisualization.html`):
  - [ ] Graph container
  - [ ] Control panel
  - [ ] Legend
  - [ ] Export options
- [ ] Create `src/pages/RdfVisualization.tsx` (replaces `visualization.html`):
  - [ ] RDF data viewer
  - [ ] Format selector
  - [ ] Syntax highlighting
  - [ ] Download options
- [ ] Test all pages
- [ ] Ensure consistent styling

#### Day 15: UI Components Library
- [ ] Create `src/components/ui/Button.tsx`:
  - [ ] Primary, secondary, danger variants
  - [ ] Size options
  - [ ] Loading state
  - [ ] Disabled state
- [ ] Create `src/components/ui/Modal.tsx`:
  - [ ] Backdrop
  - [ ] Close button
  - [ ] Portal rendering
  - [ ] Keyboard navigation (Escape to close)
- [ ] Create `src/components/ui/Tooltip.tsx`:
  - [ ] Positioning logic
  - [ ] Arrow indicator
  - [ ] Delay options
- [ ] Create `src/components/ui/Input.tsx`:
  - [ ] Text input
  - [ ] Validation states
  - [ ] Error messages
- [ ] Create `src/components/ui/Select.tsx`:
  - [ ] Dropdown select
  - [ ] Search functionality
  - [ ] Multi-select option
- [ ] Write Storybook stories (or tests) for each component
- [ ] Ensure accessibility (ARIA labels, keyboard nav)

### Week 4: Form Components

#### Day 16-17: RDF Upload Form
- [ ] Create `src/components/forms/RdfUpload.tsx`:
  - [ ] File picker
  - [ ] Drag-and-drop support
  - [ ] Format selection
  - [ ] URL input option
  - [ ] Preview pane
- [ ] Implement file upload logic:
  - [ ] Client-side validation
  - [ ] File size limits
  - [ ] Format detection
  - [ ] Progress indicator
- [ ] Parse uploaded RDF
- [ ] Store in IndexedDB
- [ ] Display success/error messages
- [ ] Write component tests
- [ ] Test with various file sizes

#### Day 18: SPARQL Query Form
- [ ] Create `src/components/forms/QueryForm.tsx`:
  - [ ] Query textarea with syntax highlighting
  - [ ] Example queries dropdown
  - [ ] Execute button
  - [ ] Clear button
- [ ] Implement SPARQL execution:
  - [ ] Query validation
  - [ ] Execute against local store
  - [ ] Display results in table
  - [ ] Export results (CSV, JSON)
- [ ] Add query history
- [ ] Write component tests

#### Day 19: Configuration Forms
- [ ] Create `src/components/forms/VisualizationConfig.tsx`:
  - [ ] Layout algorithm selection
  - [ ] Color scheme picker
  - [ ] Node size options
  - [ ] Label visibility toggle
- [ ] Create `src/components/forms/ExportConfig.tsx`:
  - [ ] Format selection
  - [ ] Quality settings
  - [ ] Filename input
- [ ] Implement form validation with react-hook-form
- [ ] Write form tests

#### Day 20: Error Boundaries and Loading States
- [ ] Create `src/components/ErrorBoundary.tsx`:
  - [ ] Catch React errors
  - [ ] Display user-friendly error message
  - [ ] Log errors for debugging
  - [ ] Reset button
- [ ] Create `src/components/LoadingState.tsx`:
  - [ ] Spinner component
  - [ ] Skeleton screens
  - [ ] Progressive loading
- [ ] Create `src/components/EmptyState.tsx`:
  - [ ] No data illustrations
  - [ ] Helpful messages
  - [ ] Call-to-action buttons
- [ ] Apply to all pages
- [ ] Test error scenarios

---

## Phase 3: State Management & Routing (Weeks 5-6) 🔄 IN PROGRESS (43% Complete)

**Current Status**: 
- ✅ Global state management (GraphContext)
- ✅ React Router navigation (3 pages)
- ✅ Navigation components
- ✅ Test-driven parser fixes (63/63 tests passing)
- ⏳ History/Undo functionality
- ⏳ Persistent UI state
- ⏳ Advanced query builder
- ⏳ SPARQL query execution

### Week 5: State Management ✅

#### Day 21-25: React Context & Router ✅
- [x] Created `src/contexts/GraphContext.tsx` (242 lines)
  - [x] Global state for graph data, selections, filters, config
  - [x] Action creators for all state updates
  - [x] TypeScript interfaces fully typed
  - [x] **14 tests** - all passing
- [x] Implemented React Router v6:
  - [x] Created `src/pages/Home.tsx` (117 lines) - landing page
  - [x] Created `src/pages/Visualize.tsx` (248 lines) - main graph view
  - [x] Created `src/pages/Database.tsx` (153 lines) - storage management
  - [x] Route configuration in `main.tsx`
  - [x] Navigation component with active link highlighting
  - [x] Responsive layout with CSS styling
- [x] **TDD Session** (Nov 22):
  - [x] Fixed 5 failing parser tests
  - [x] RDF parser literal handling
  - [x] Turtle multiple object parsing
  - [x] Node creation order fixes
  - [x] All 63 tests now passing (100%)

### Week 6: Advanced State Features ⏳ NEXT

#### Day 26-27: History/Undo Functionality ⏳ CURRENT TASK
- [ ] Create `src/contexts/HistoryContext.tsx`
- [ ] Implement state history tracking:
  - [ ] Store previous states
  - [ ] Undo/redo commands
  - [ ] History limit (e.g., 50 actions)
- [ ] Create history actions:
  - [ ] `undo()` - Revert to previous state
  - [ ] `redo()` - Move forward in history
  - [ ] `pushHistory()` - Add new state to history
  - [ ] `clearHistory()` - Reset history
- [ ] Add keyboard shortcuts:
  - [ ] Ctrl+Z / Cmd+Z for undo
  - [ ] Ctrl+Shift+Z / Cmd+Shift+Z for redo
- [ ] Create UI components:
  - [ ] History panel (list of actions)
  - [ ] Undo/redo buttons
  - [ ] History timeline visualization
- [ ] Write tests for history functionality
- [ ] Integrate with GraphContext

#### Day 28-29: Persistent UI State ⏳
- [ ] Create `src/lib/storage/ui-state.ts`
- [ ] Implement localStorage integration:
  - [ ] Save UI preferences
  - [ ] Save filter state
  - [ ] Save visualization config
  - [ ] Save recent files/queries
- [ ] Add state hydration on load:
  - [ ] Load saved preferences
  - [ ] Validate stored data
  - [ ] Handle migration of old formats
- [ ] Create settings UI:
  - [ ] Theme selector (light/dark)
  - [ ] Default visualization settings
  - [ ] Clear saved data button
- [ ] Write tests for persistence
- [ ] Add versioning for saved state

#### Day 30: Advanced Query Builder ⏳
- [ ] Create `src/components/forms/QueryBuilder.tsx`
- [ ] Implement visual SPARQL query builder:
  - [ ] Triple pattern builder
  - [ ] Subject/predicate/object selectors
  - [ ] Filter builder (FILTER expressions)
  - [ ] Optional patterns (OPTIONAL)
  - [ ] Union patterns (UNION)
- [ ] Add query templates:
  - [ ] Common queries dropdown
  - [ ] Save custom templates
  - [ ] Share templates
- [ ] Add syntax highlighting for generated SPARQL
- [ ] Add query validation
- [ ] Write component tests

---

### Week 5: Force-Directed Graph

#### Day 21-22: D3 Graph Migration (`graphVisualization.js` → `d3-graph.ts`)
- [ ] Copy `/Users/kempersc/apps/example_ld/js/graphVisualization.js` for reference
- [ ] Create `src/components/visualizations/GraphView/d3-graph.ts`
- [ ] Upgrade D3 v5 syntax to v7:
  - [ ] Update force simulation API
  - [ ] Update selection API
  - [ ] Update scale API
- [ ] Implement core force-directed layout:
  - [ ] Node positioning
  - [ ] Link rendering
  - [ ] Force parameters (charge, link distance, collision)
- [ ] Add node styling by type:
  - [ ] Color schemes
  - [ ] Shape variations
  - [ ] Size variations
- [ ] Add link styling by relationship:
  - [ ] Stroke width
  - [ ] Stroke color
  - [ ] Arrows/markers

#### Day 23: Graph Interactivity
- [ ] Implement zoom and pan:
  - [ ] d3.zoom() behavior
  - [ ] Scale extent limits
  - [ ] Smooth transitions
- [ ] Implement node dragging:
  - [ ] Drag behavior
  - [ ] Fix node position on drag
  - [ ] Release to resume simulation
- [ ] Implement node click handling:
  - [ ] Select node
  - [ ] Show details panel
  - [ ] Highlight connected nodes
- [ ] Implement hover effects:
  - [ ] Tooltip with node info
  - [ ] Highlight on hover
  - [ ] Dim unrelated nodes
- [ ] Add keyboard navigation:
  - [ ] Arrow keys to navigate nodes
  - [ ] Enter to expand
  - [ ] Escape to deselect

#### Day 24-25: React Integration
- [ ] Create React hook `useD3ForceGraph`:
  - [ ] Accept nodes and links as props
  - [ ] Return SVG ref
  - [ ] Handle cleanup on unmount
  - [ ] Respond to data changes
- [ ] Create `src/components/visualizations/GraphView/index.tsx`:
  - [ ] Use the D3 hook
  - [ ] Add control panel
  - [ ] Add legend
  - [ ] Add export button
- [ ] Create control components:
  - [ ] Layout algorithm selector
  - [ ] Filter controls
  - [ ] Search box
  - [ ] Reset button
- [ ] Implement filtering:
  - [ ] By node type
  - [ ] By relationship type
  - [ ] By search term
- [ ] Test with sample data
- [ ] Test with large datasets (1000+ nodes)

### Week 6: Additional Visualizations

#### Day 26-27: Timeline Visualization
- [ ] Create `src/components/visualizations/Timeline/index.tsx`
- [ ] Implement temporal change visualization:
  - [ ] Time scale (d3.scaleTime)
  - [ ] Swim lanes for institutions
  - [ ] Event markers (founding, merger, closure)
- [ ] Add interactivity:
  - [ ] Zoom to time range
  - [ ] Click event for details
  - [ ] Tooltip with event info
- [ ] Add controls:
  - [ ] Date range selector
  - [ ] Event type filter
  - [ ] Institution filter
- [ ] Style timeline:
  - [ ] Color code by event type
  - [ ] Symbol shapes
  - [ ] Grid lines
- [ ] Write visualization tests

#### Day 28: Geographic Map
- [ ] Create `src/components/visualizations/Map/index.tsx`
- [ ] Integrate Leaflet for base map
- [ ] Add D3 overlay for custom markers:
  - [ ] Circle markers scaled by count
  - [ ] Color by institution type
  - [ ] Cluster markers when zoomed out
- [ ] Implement interactivity:
  - [ ] Click marker for details
  - [ ] Hover for preview
  - [ ] Zoom to region
- [ ] Add map controls:
  - [ ] Layer toggle (street, satellite)
  - [ ] Legend
  - [ ] Search by location
- [ ] Test with geocoded data

#### Day 29: Class Hierarchy Tree
- [ ] Create `src/components/visualizations/Hierarchy/index.tsx`
- [ ] Implement tree layout (d3.tree):
  - [ ] Hierarchical positioning
  - [ ] Collapsible nodes
  - [ ] Smooth transitions
- [ ] Style tree nodes:
  - [ ] Rectangles for classes
  - [ ] Diamonds for properties
  - [ ] Circles for datatypes
- [ ] Add interactivity:
  - [ ] Click to expand/collapse
  - [ ] Zoom to fit
  - [ ] Search and highlight
- [ ] Add breadcrumb navigation
- [ ] Test with ontology data

#### Day 30: Visualization Testing
- [ ] Write unit tests for D3 utilities
- [ ] Write integration tests for each visualization
- [ ] Visual regression tests (Percy, Chromatic, or screenshots)
- [ ] Performance tests:
  - [ ] Measure render time
  - [ ] Test with 100, 1000, 10000 nodes
  - [ ] Profile memory usage
- [ ] Accessibility tests:
  - [ ] Keyboard navigation
  - [ ] Screen reader support
  - [ ] Color contrast
- [ ] Cross-browser testing (Chrome, Firefox, Safari, Edge)

---

## Phase 4: State Management and API (Weeks 7-8)

### Week 7: State Management

#### Day 31-32: Zustand Stores
- [ ] Create `src/stores/rdf-store.ts`:
  - [ ] RDF data state
  - [ ] Loading states
  - [ ] Error states
  - [ ] Actions (load, parse, save, clear)
- [ ] Create `src/stores/ui-store.ts`:
  - [ ] Theme state (light/dark)
  - [ ] Sidebar collapsed state
  - [ ] Selected visualization type
  - [ ] Filter states
  - [ ] Actions (toggle theme, set view, update filters)
- [ ] Create `src/stores/visualization-store.ts`:
  - [ ] Visualization configuration
  - [ ] Selected nodes/links
  - [ ] Zoom level
  - [ ] Actions (update config, select item, reset)
- [ ] Write store tests
- [ ] Document store usage

#### Day 33: React Query Setup
- [ ] Configure React Query client:
  - [ ] Set default options
  - [ ] Configure caching strategy
  - [ ] Set retry logic
- [ ] Create query hooks:
  - [ ] `useRdfData(url: string)`
  - [ ] `useOntology(schemaId: string)`
  - [ ] `useInstitutions(filters: FilterOptions)`
- [ ] Create mutation hooks:
  - [ ] `useUploadRdf()`
  - [ ] `useDeleteRdf()`
  - [ ] `useUpdateRdf()`
- [ ] Add optimistic updates
- [ ] Add cache invalidation logic
- [ ] Write query tests

#### Day 34-35: API Client
- [ ] Copy `/Users/kempersc/apps/example_ld/js/api.js` for reference
- [ ] Create `src/lib/api/client.ts`:
  - [ ] Axios instance configuration
  - [ ] Request interceptors
  - [ ] Response interceptors
  - [ ] Error handling
- [ ] Implement API methods:
  - [ ] `fetchRdf(url: string, format: RdfFormat)`
  - [ ] `fetchSparqlResults(query: string, endpoint: string)`
  - [ ] `uploadRdf(file: File)`
  - [ ] `transformRdf(data: string, format: RdfFormat)`
- [ ] Add retry logic with exponential backoff
- [ ] Add circuit breaker pattern
- [ ] Add request cancellation
- [ ] Write API client tests (mock axios)
- [ ] Test error scenarios

### Week 8: Data Integration

#### Day 36-37: RDF Schema Loading
- [ ] Load schemas from `/schemas/20251121/rdf/`:
  - [ ] `01_custodian_name.owl.ttl`
  - [ ] Other schema files
- [ ] Parse schema with N3.js
- [ ] Extract classes and properties
- [ ] Build class hierarchy
- [ ] Store in IndexedDB for offline use
- [ ] Create schema browsing UI
- [ ] Test with actual schema files

#### Day 38: UML Diagram Parsing
- [ ] Load UML diagrams from `/schemas/20251121/uml/`:
  - [ ] Mermaid files (`.mmd`)
  - [ ] PlantUML files (`.puml`)
- [ ] Create Mermaid parser:
  - [ ] Parse class diagrams
  - [ ] Parse ER diagrams
  - [ ] Extract nodes and relationships
- [ ] Create PlantUML parser:
  - [ ] Parse syntax
  - [ ] Extract classes
  - [ ] Extract relationships
- [ ] Convert to D3-compatible format
- [ ] Test parsers with actual diagram files

#### Day 39-40: Data Pipeline
- [ ] Create data flow pipeline:
  1. Load RDF schema
  2. Parse with N3.js
  3. Store in IndexedDB
  4. Query with SPARQL (in-memory)
  5. Transform to visualization format
  6. Render with D3
- [ ] Optimize for performance:
  - [ ] Use Web Workers for parsing
  - [ ] Implement streaming for large files
  - [ ] Add pagination for results
- [ ] Add progress indicators
- [ ] Test end-to-end flow
- [ ] Profile performance bottlenecks

---

## Phase 5: Testing and Quality (Weeks 9-10)

### Week 9: Comprehensive Testing

#### Day 41-42: Unit Tests
- [ ] Achieve 80%+ code coverage for:
  - [ ] `src/lib/rdf/parser.ts`
  - [ ] `src/lib/storage/indexed-db.ts`
  - [ ] `src/lib/api/client.ts`
  - [ ] `src/lib/utils/helpers.ts`
- [ ] Test all utility functions
- [ ] Test all custom hooks
- [ ] Test store actions and selectors
- [ ] Review coverage report
- [ ] Add missing tests

#### Day 43-44: Component Tests
- [ ] Test all UI components:
  - [ ] Button, Modal, Tooltip, Input, Select
- [ ] Test all form components:
  - [ ] RdfUpload, QueryForm, Config forms
- [ ] Test all page components:
  - [ ] Home, ApiExplorer, DatabaseManager, etc.
- [ ] Test layout components:
  - [ ] Header, Sidebar, Footer
- [ ] Use React Testing Library best practices
- [ ] Test user interactions
- [ ] Test accessibility

#### Day 45: Integration Tests
- [ ] Test complete user flows:
  - [ ] Upload RDF → Parse → Visualize
  - [ ] Query SPARQL → Display results
  - [ ] Load schema → Browse classes
  - [ ] Filter graph → Export
- [ ] Test state management integration
- [ ] Test API integration
- [ ] Test database persistence
- [ ] Test error recovery

### Week 10: E2E Testing and Performance

#### Day 46-47: Playwright E2E Tests
- [ ] Set up Playwright test environment
- [ ] Write E2E tests for:
  - [ ] User onboarding flow
  - [ ] RDF upload and visualization
  - [ ] Graph interaction
  - [ ] SPARQL queries
  - [ ] Export functionality
- [ ] Test cross-browser (Chromium, Firefox, WebKit)
- [ ] Test responsive layouts (mobile, tablet, desktop)
- [ ] Add visual regression tests
- [ ] Generate test reports

#### Day 48: Performance Optimization
- [ ] Run Lighthouse audits
- [ ] Optimize bundle size:
  - [ ] Code splitting
  - [ ] Tree shaking
  - [ ] Dynamic imports
  - [ ] Analyze with `vite-bundle-visualizer`
- [ ] Optimize rendering:
  - [ ] Memoization (useMemo, useCallback)
  - [ ] Virtualization for large lists
  - [ ] Debounce expensive operations
- [ ] Optimize network requests:
  - [ ] Caching strategies
  - [ ] Request deduplication
  - [ ] Compression
- [ ] Profile with React DevTools Profiler
- [ ] Measure Core Web Vitals

#### Day 49-50: Accessibility Audit
- [ ] Run axe DevTools
- [ ] Fix all critical accessibility issues
- [ ] Ensure WCAG 2.1 AA compliance:
  - [ ] Keyboard navigation
  - [ ] Screen reader support
  - [ ] Color contrast
  - [ ] Focus indicators
  - [ ] ARIA labels
- [ ] Test with screen readers (NVDA, JAWS, VoiceOver)
- [ ] Create accessibility documentation

---

## Phase 6: Backend Services (Weeks 11-12)

### Week 11: Python Service Migration

#### Day 51-53: RDF Transformer Service
- [ ] Copy `/Users/kempersc/apps/example_ld/extract_and_transform.py` for reference
- [ ] Create `backend/services/rdf-transformer/`:
  - [ ] FastAPI or Flask application
  - [ ] Dockerfile
  - [ ] Requirements.txt
- [ ] Implement API endpoints:
  - [ ] `POST /transform` - Transform RDF formats
  - [ ] `POST /validate` - Validate RDF syntax
  - [ ] `POST /merge` - Merge multiple RDF files
- [ ] Add request validation with Pydantic
- [ ] Add error handling
- [ ] Add logging
- [ ] Write Python tests (pytest)
- [ ] Create API documentation (OpenAPI/Swagger)

#### Day 54-55: OAI-PMH Harvester Service
- [ ] Create `backend/services/harvester/`:
  - [ ] FastAPI application
  - [ ] Celery for async tasks
  - [ ] Redis for task queue
- [ ] Implement harvesting logic:
  - [ ] OAI-PMH protocol support
  - [ ] Incremental harvesting
  - [ ] Error recovery
  - [ ] Rate limiting
- [ ] Implement API endpoints:
  - [ ] `POST /harvest` - Start harvest job
  - [ ] `GET /harvest/:id` - Get job status
  - [ ] `GET /harvests` - List all harvests
- [ ] Add scheduling (APScheduler or Celery beat)
- [ ] Write tests
- [ ] Document API

### Week 12: Backend Integration

#### Day 56-57: MARC Converter Service
- [ ] Create `backend/services/marc-converter/`:
  - [ ] FastAPI application
  - [ ] MARC21 parsing library
- [ ] Implement conversion logic:
  - [ ] MARC21 to RDF
  - [ ] MARCXML to RDF
  - [ ] Validate MARC records
- [ ] Implement API endpoints:
  - [ ] `POST /convert` - Convert MARC to RDF
  - [ ] `POST /validate` - Validate MARC
- [ ] Write tests
- [ ] Document API

#### Day 58-59: Backend Deployment
- [ ] Create Docker Compose configuration:
  - [ ] RDF transformer service
  - [ ] Harvester service
  - [ ] MARC converter service
  - [ ] Redis
  - [ ] PostgreSQL (if needed)
- [ ] Set up service communication
- [ ] Configure environment variables
- [ ] Add health check endpoints
- [ ] Test local deployment
- [ ] Document deployment process

#### Day 60: Frontend-Backend Integration
- [ ] Update frontend API client to call backend services
- [ ] Test RDF transformation flow
- [ ] Test harvesting flow
- [ ] Test MARC conversion flow
- [ ] Add error handling for backend errors
- [ ] Add loading states
- [ ] Test with production-like data

---

## Phase 7: Polish and Documentation (Weeks 13-14)

### Week 13: UI/UX Polish

#### Day 61-62: Design Refinement
- [ ] Review all pages for consistency
- [ ] Standardize spacing and typography
- [ ] Refine color scheme
- [ ] Add transitions and animations
- [ ] Improve loading states
- [ ] Improve error messages
- [ ] Add empty states
- [ ] Polish mobile experience

#### Day 63: User Onboarding
- [ ] Create welcome tour (react-joyride or similar)
- [ ] Add tooltips for complex features
- [ ] Create quick start guide
- [ ] Add example datasets
- [ ] Add sample queries
- [ ] Create video tutorial (optional)

#### Day 64-65: Internationalization (Optional)
- [ ] Set up i18n (react-i18next)
- [ ] Extract all text to translation files
- [ ] Add language selector
- [ ] Support at least English and Dutch
- [ ] Test with different languages
- [ ] Document translation process

### Week 14: Documentation

#### Day 66-67: User Documentation
- [ ] Create user guide:
  - [ ] Getting started
  - [ ] Uploading RDF data
  - [ ] Visualizing data
  - [ ] Running SPARQL queries
  - [ ] Exporting results
  - [ ] Troubleshooting
- [ ] Create FAQ
- [ ] Add inline help text
- [ ] Create video tutorials (optional)

#### Day 68-69: Developer Documentation
- [ ] Document codebase architecture
- [ ] Document component API
- [ ] Document state management
- [ ] Create contribution guide
- [ ] Document build and deployment
- [ ] Create API reference
- [ ] Add code examples

#### Day 70: Release Preparation
- [ ] Create CHANGELOG.md
- [ ] Update README.md
- [ ] Create LICENSE file
- [ ] Set up GitHub releases
- [ ] Create release notes
- [ ] Tag version 1.0.0

---

## Phase 8: Deployment and Monitoring (Weeks 15-16)

### Week 15: Deployment

#### Day 71-72: Production Build
- [ ] Optimize Vite build configuration
- [ ] Set up environment variables for production
- [ ] Build frontend bundle
- [ ] Build backend Docker images
- [ ] Test production build locally
- [ ] Fix any production-only issues

#### Day 73-74: Hosting Setup
- [ ] Choose hosting platform:
  - [ ] Vercel/Netlify (frontend)
  - [ ] AWS/GCP/Azure (backend)
  - [ ] Or self-hosted
- [ ] Set up frontend deployment:
  - [ ] Configure build settings
  - [ ] Set up custom domain
  - [ ] Configure HTTPS
  - [ ] Set up CDN
- [ ] Set up backend deployment:
  - [ ] Deploy Docker containers
  - [ ] Configure load balancer
  - [ ] Set up database
  - [ ] Configure Redis
- [ ] Test deployed application
- [ ] Set up staging environment

#### Day 75: CI/CD Pipeline
- [ ] Set up GitHub Actions (or GitLab CI):
  - [ ] Run tests on push
  - [ ] Run linting
  - [ ] Build on merge to main
  - [ ] Deploy to staging automatically
  - [ ] Deploy to production on tag
- [ ] Set up deployment notifications
- [ ] Document CI/CD process

### Week 16: Monitoring and Maintenance

#### Day 76-77: Monitoring Setup
- [ ] Set up error tracking (Sentry, Rollbar)
- [ ] Set up analytics (Google Analytics, Plausible)
- [ ] Set up performance monitoring (Lighthouse CI)
- [ ] Set up uptime monitoring (UptimeRobot, Pingdom)
- [ ] Set up log aggregation (if needed)
- [ ] Create monitoring dashboard

#### Day 78: Security Audit
- [ ] Run npm audit and fix vulnerabilities
- [ ] Review Content Security Policy
- [ ] Review CORS configuration
- [ ] Test for XSS vulnerabilities
- [ ] Test for CSRF vulnerabilities
- [ ] Review authentication (if implemented)
- [ ] Test rate limiting
- [ ] Document security practices

#### Day 79: Load Testing
- [ ] Set up load testing tool (k6, Artillery)
- [ ] Test API endpoints under load
- [ ] Test database performance
- [ ] Test frontend performance with large datasets
- [ ] Identify bottlenecks
- [ ] Optimize as needed
- [ ] Document performance characteristics

#### Day 80: Launch and Handoff
- [ ] Final QA testing
- [ ] Deploy to production
- [ ] Announce launch
- [ ] Monitor for issues
- [ ] Create maintenance plan
- [ ] Create bug report process
- [ ] Schedule regular updates
- [ ] Celebrate! 🎉

---

## Post-Launch Checklist

### Week 17+: Maintenance and Enhancement

#### Ongoing Tasks
- [ ] Monitor error rates and fix bugs
- [ ] Review user feedback
- [ ] Update dependencies regularly
- [ ] Review and merge pull requests
- [ ] Improve documentation based on user questions
- [ ] Plan feature enhancements

#### Monthly Tasks
- [ ] Review analytics data
- [ ] Run security audit
- [ ] Update dependencies
- [ ] Review performance metrics
- [ ] Backup database
- [ ] Review and update documentation

#### Quarterly Tasks
- [ ] Major feature releases
- [ ] Comprehensive testing
- [ ] User survey
- [ ] Performance optimization sprint
- [ ] Security review

---

## Success Metrics

### Technical Metrics
- [ ] Test coverage > 80%
- [ ] Bundle size < 500KB (gzipped)
- [ ] Lighthouse score > 90
- [ ] Page load time < 2 seconds
- [ ] API response time < 200ms (p95)
- [ ] Zero critical vulnerabilities

### User Metrics
- [ ] User satisfaction score > 4/5
- [ ] Task completion rate > 90%
- [ ] Error rate < 1%
- [ ] Daily active users growth
- [ ] Feature adoption rate

---

## Risk Mitigation

### Technical Risks
| Risk | Mitigation |
|------|------------|
| D3 v5 → v7 breaking changes | Thorough testing, gradual migration |
| Large RDF file performance | Web Workers, streaming, pagination |
| Browser compatibility | Cross-browser testing, polyfills |
| State management complexity | Clear documentation, simple patterns |

### Project Risks
| Risk | Mitigation |
|------|------------|
| Scope creep | Clear requirements, phased approach |
| Timeline delays | Buffer time, prioritization |
| Technical debt | Code reviews, refactoring sprints |
| Knowledge silos | Documentation, pair programming |

---

## Resources

### Documentation
- [ ] [React Documentation](https://react.dev/)
- [ ] [TypeScript Handbook](https://www.typescriptlang.org/docs/)
- [ ] [D3.js Documentation](https://d3js.org/)
- [ ] [N3.js Documentation](https://github.com/rdfjs/N3.js)
- [ ] [Zustand Documentation](https://docs.pmnd.rs/zustand/)
- [ ] [React Query Documentation](https://tanstack.com/query/)
- [ ] [Vite Documentation](https://vitejs.dev/)
- [ ] [Vitest Documentation](https://vitest.dev/)
- [ ] [Playwright Documentation](https://playwright.dev/)

### Reference Projects
- [ ] `/Users/kempersc/apps/example_ld` - Original implementation
- [ ] RDF visualization examples
- [ ] D3.js example gallery

---

## Notes

- This checklist is living document - update as needed
- Mark items complete as you finish them
- Add notes for complex items
- Link to relevant pull requests or commits
- Update timeline if needed
- Celebrate milestones!

---

**Last Updated**: 2025-11-22  
**Version**: 1.0  
**Status**: Ready to begin implementation