glam/frontend/FRONTEND_PROGRESS.md

Frontend Development Progress

Last Updated: 2025-11-22
Status: Phase 3 in progress (71% complete)
Tests: 105/105 passing (100%)
Build: 386 KB (123 KB gzipped)

---

Phase 1: Foundation ✅ COMPLETE

Core Data Structures

• RDF data models (Node, Link, Graph)
• Type definitions for Turtle, N-Triples, RDF/XML
• Result type pattern for error handling

Parser Implementation

• Turtle parser with prefix support
• N-Triples parser
• RDF/XML parser (basic)
• JSON-LD parser (basic)
• Parser factory with auto-detection
• Tests: 79 tests passing

Status: 100% complete

---

Phase 2: Visualization Components ✅ COMPLETE

D3.js Graph Visualization

• Force-directed layout
• Node and link rendering
• Zoom and pan controls
• Interactive selection
• Label display
• Custom styling

Supporting Components

• StatsSummary - Graph metrics display
• GraphVisualization wrapper
• Tests for all components

Status: 100% complete

---

Phase 3: State Management & Interaction (IN PROGRESS - 71%)

Next Task: Task 6 - Query Builder (see PHASE3_TASK6_QUERY_BUILDER.md)
Triplestore: Oxigraph (see TRIPLESTORE_OXIGRAPH_SETUP.md)

Triplestore Decision ✅ COMPLETE

Completed: 2025-11-22
Decision: Use Oxigraph as RDF triplestore for SPARQL queries

Rationale:

• ✅ Lightweight, modern Rust implementation
• ✅ SPARQL 1.1 compliant
• ✅ Multiple deployment modes (server, WASM, embedded)
• ✅ Active development, cultural heritage sector adoption
• ✅ Explicitly chosen in project planning (September 2025)

Documentation: TRIPLESTORE_OXIGRAPH_SETUP.md

Alternatives Considered: Virtuoso (heavyweight), Blazegraph (discontinued), Fuseki (complex), GraphDB (proprietary)

---

Task 1: GraphContext ✅ COMPLETE

• React Context for global graph state
• useGraph() hook
• Type-safe state updates
• Tests: 15 tests passing

Files: src/contexts/GraphContext.tsx (242 lines)

---

Task 2: React Router Navigation ✅ COMPLETE

• React Router v6 integration
• Three main pages:
  • Home page with welcome content
  • Visualize page with graph viewer
  • Database page with IndexedDB integration
  • Settings page with preferences ← NEW
• Client-side routing

Files:

• src/App.tsx - Router configuration
• src/pages/Home.tsx (117 lines)
• src/pages/Visualize.tsx (248 lines)
• src/pages/Database.tsx (153 lines)
• src/pages/Settings.tsx (15 lines) ← NEW

---

Task 3: Navigation Components ✅ COMPLETE

• Layout component with Outlet
• Navigation component with active state
• Responsive header
• Tests for navigation

Files:

• src/components/layout/Layout.tsx (19 lines)
• src/components/layout/Navigation.tsx (53 lines) - Updated with Settings link
• src/components/layout/Layout.css
• src/components/layout/Navigation.css

---

Task 4: History/Undo Functionality ✅ COMPLETE

• Generic useHistory<T> hook with undo/redo
• History stack with configurable size
• Keyboard shortcuts (Ctrl+Z, Ctrl+Shift+Z)
• HistoryPanel component with timeline UI
• Visual state indicators (past/present/future)
• Tests: 16 tests passing

Files:

• src/contexts/HistoryContext.tsx (240 lines)
• src/components/history/HistoryPanel.tsx (87 lines)
• src/components/history/HistoryPanel.css (237 lines)
• tests/unit/history-context.test.tsx (291 lines)

Documentation: PHASE3_HISTORY_COMPLETE.md

---

Task 5: Persistent UI State ✅ COMPLETE

• localStorage utilities module
• UIStateContext for preferences
• Automatic state hydration
• Debounced saves (500ms)
• Settings panel UI with:
  • Theme selection
  • Visualization settings
  • Display options
  • History configuration
  • Recent files/queries management
  • Export/Import settings
• Tests: 26 tests passing

Files:

• src/lib/storage/ui-state.ts (320 lines)
• src/contexts/UIStateContext.tsx (310 lines)
• src/components/settings/SettingsPanel.tsx (218 lines)
• src/components/settings/SettingsPanel.css (186 lines)
• tests/unit/ui-state.test.ts (331 lines)

Features:

• Schema versioning with migrations
• Deep merge with array handling
• Recent activity tracking (10 files, 20 queries)
• Settings backup/restore
• localStorage error handling

Documentation: PHASE3_PERSISTENT_UI_STATE_COMPLETE.md

---

Task 6: Advanced Query Builder ⏳ READY TO START

Goal: Visual SPARQL query builder with live syntax preview

Planned Features:

• Subject-Predicate-Object triple pattern builder
• Filter conditions UI (FILTER, REGEX, LANG)
• Live SPARQL syntax preview (CodeMirror with highlighting)
• Client-side query validation
• Query templates library (10+ pre-built queries)
• Save/load queries to localStorage
• Prefix management

Implementation Plan:

1. Create query templates (30 min)
2. Create query validator (45 min)
3. Install CodeMirror (15 min)
4. Create query editor component (30 min)
5. Create query builder component (90 min)
6. Create query builder page (45 min)
7. Add routing/navigation (15 min)
8. Write tests (30 min)

Status: Planning complete, ready to implement
Estimated Time: 4-5 hours
Documentation: PHASE3_TASK6_QUERY_BUILDER.md
Note: Does NOT require Oxigraph (query execution in Task 7)

---

Task 7: SPARQL Query Execution ⏳ PLANNED

Goal: Execute SPARQL queries against loaded RDF data via Oxigraph

Planned Features:

• Oxigraph triplestore integration (server mode)
• SPARQL HTTP client module
• Query execution hook (useSparqlQuery)
• Results viewer component (table, JSON, graph views)
• Export results (CSV, JSON, RDF)
• Query performance metrics (execution time, result count)

Implementation Steps:

1. Install/configure Oxigraph server (30 min)
2. Load Denmark dataset (43,429 triples) (15 min)
3. Create SPARQL client module (45 min)
4. Create query execution hook (30 min)
5. Create results viewer component (90 min)
6. Add export functionality (60 min)
7. Write integration tests (30 min)

Status: Planning complete, requires Task 6 first
Estimated Time: 6-8 hours
Documentation: TRIPLESTORE_OXIGRAPH_SETUP.md
Prerequisite: Oxigraph server installed and running

---

Phase 4: Data Management (NOT STARTED)

IndexedDB Integration

• Store RDF graphs in IndexedDB
• List saved graphs
• Load/delete graphs
• Export graphs

File Operations

• File upload UI
• Format detection
• Drag-and-drop support
• Progress indicators

---

Phase 5: Advanced Features (NOT STARTED)

Advanced Visualizations

• Hierarchical layout
• Circular layout
• Custom node shapes by type

Filtering

• Filter by node type
• Filter by predicate
• Search functionality

Settings

• Theme selection
• Layout preferences
• Performance options

---

Test Summary

Test Files  7 passed (7)
Tests       105 passed (105)
  ├─ RDF Parser Tests (29 tests)
  ├─ RDF Models Tests (8 tests)
  ├─ Graph Stats Tests (7 tests)
  ├─ Parser Factory Tests (15 tests)
  ├─ History Context Tests (16 tests)
  ├─ UI State Tests (26 tests)
  └─ Hook Tests (4 tests)

Duration: ~1.2s
Coverage: Focus on core library, contexts, utilities

---

Build Metrics

Bundle Size:  386 KB (123 KB gzipped)
CSS Size:     15 KB (3.6 KB gzipped)
Modules:      632 modules
Build Time:   ~900ms

Dependencies:

• React 18.3
• React Router 7.1
• D3.js 7.9
• TypeScript 5.7
• Vite 7.2
• Vitest 3.0

---

Project Structure

frontend/
├── src/
│   ├── lib/
│   │   ├── rdf/
│   │   │   ├── models.ts          # Core RDF data structures
│   │   │   ├── parser.ts          # Main parser (514 lines)
│   │   │   └── factory.ts         # Parser factory
│   │   └── storage/
│   │       ├── indexed-db.ts      # IndexedDB utilities
│   │       └── ui-state.ts        # localStorage utilities (NEW)
│   ├── contexts/
│   │   ├── GraphContext.tsx       # Global graph state
│   │   ├── HistoryContext.tsx     # Undo/redo system
│   │   └── UIStateContext.tsx     # Persistent preferences (NEW)
│   ├── components/
│   │   ├── graph/
│   │   │   ├── GraphVisualization.tsx
│   │   │   └── StatsSummary.tsx
│   │   ├── layout/
│   │   │   ├── Layout.tsx
│   │   │   └── Navigation.tsx
│   │   ├── history/
│   │   │   └── HistoryPanel.tsx
│   │   └── settings/               (NEW)
│   │       ├── SettingsPanel.tsx
│   │       └── SettingsPanel.css
│   ├── pages/
│   │   ├── Home.tsx
│   │   ├── Visualize.tsx
│   │   ├── Database.tsx
│   │   └── Settings.tsx            (NEW)
│   ├── hooks/
│   │   └── useRdfParser.ts
│   ├── App.tsx
│   └── main.tsx
├── tests/
│   └── unit/
│       ├── rdf-parser.test.ts
│       ├── rdf-models.test.ts
│       ├── graph-stats.test.ts
│       ├── parser-factory.test.ts
│       ├── history-context.test.tsx
│       ├── ui-state.test.ts       (NEW)
│       └── use-rdf-parser.test.ts
├── TDD_SESSION_FIXES.md
├── PHASE3_HISTORY_COMPLETE.md
└── PHASE3_PERSISTENT_UI_STATE_COMPLETE.md  (NEW)

---

Recent Changes (2025-11-22)

Session 1: TDD Fixes

• Fixed 5 failing RDF parser tests
• Updated parser to create links for rdfs:label
• Fixed node creation order
• Added comma-separated object parsing for Turtle
• Documentation: TDD_SESSION_FIXES.md

Session 2: History Implementation

• Implemented HistoryContext with undo/redo
• Created HistoryPanel component with timeline UI
• Added keyboard shortcuts (Ctrl+Z, Ctrl+Shift+Z)
• 16 comprehensive tests
• Documentation: PHASE3_HISTORY_COMPLETE.md

Session 3: Persistent UI State ← CURRENT

• Created localStorage utilities module
• Implemented UIStateContext
• Built Settings panel with comprehensive UI
• Added Settings page and navigation
• 26 comprehensive tests
• Fixed deep merge array handling
• Documentation: PHASE3_PERSISTENT_UI_STATE_COMPLETE.md

---

Next Session Goals

Priority 1: Query Builder (Task 6)

Estimated Time: 4-5 hours

1. Create query builder component
2. Implement S-P-O pattern UI
3. Add filter conditions
4. SPARQL syntax preview
5. Query validation
6. Template library

Priority 2: SPARQL Execution (Task 7)

Estimated Time: 3-4 hours

1. Integrate SPARQL engine
2. Results table display
3. Export functionality
4. Query history
5. Performance metrics

---

Commands

# Development
npm run dev          # Start dev server (http://localhost:5173)

# Testing
npm run test         # Watch mode
npm run test:run     # Single run
npm run test:ui      # Visual test UI

# Building
npm run build        # TypeScript + Vite build
npm run preview      # Preview production build

# Linting
npm run lint         # ESLint check

---

Key Design Decisions

1. Context-based State: Using React Context for global state (GraphContext, UIStateContext, HistoryContext)
2. localStorage for Persistence: User preferences saved locally, not in backend
3. Debounced Saves: 500ms debounce prevents localStorage thrashing
4. Schema Versioning: UI state has version field for future migrations
5. Type-Safe APIs: All state updates are type-safe with TypeScript
6. Comprehensive Testing: 105 tests covering core functionality
7. Modular Architecture: Clean separation between lib, contexts, components, pages

---

Progress: Phase 3 is 71% complete (5 of 7 tasks done)
Next: Query Builder (Task 6)
Status: All systems operational, zero errors