FRE-587 Phase 5: Add offline persistence + UI components
Phase 5 Polish & Optimization - Part 1: Offline Persistence: - Create IDBPersistence class for IndexedDB storage - Auto-save with configurable intervals (default 5s) - Offline mode with update queuing - Automatic flush when back online UI Components: - ChangeHighlighting component - visual change indicators - Color-coded by user - Auto-fade after 30s - Toggle visibility - VersionHistoryPanel component - snapshot management - Chronological snapshot list - Relative timestamps - One-click restore - Manual snapshot creation Documentation: - analysis/fre587_phase5_polish_implementation.md Co-Authored-By: Paperclip <noreply@paperclip.ing>
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analysis/fre587_phase5_polish_implementation.md
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# FRE-587 Phase 5: Polish & Optimization - Implementation Summary
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## Phase 5 Implementation Status (In Progress)
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### ✅ Completed Components
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#### 1. IndexedDB Persistence (`src/lib/collaboration/idb-persistence.ts`)
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Offline-first storage layer for Yjs documents with automatic sync.
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**Features:**
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- Automatic document persistence to IndexedDB
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- Offline mode with update queuing
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- Auto-save with configurable intervals (default: 5s)
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- Manual save/load operations
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- Update flushing when back online
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- Last saved timestamp tracking
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**Interface:**
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```typescript
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interface IDBPersistence {
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save(docName: string): Promise<void>;
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load(docName: string): Promise<Uint8Array | null>;
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loadAndApply(docName: string): Promise<boolean>;
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startAutoSave(docName: string): void;
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stopAutoSave(): void;
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queueUpdate(update: Uint8Array): void;
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flushUpdates(docName: string): Promise<void>;
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setOnline(online: boolean): void;
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getPendingUpdateCount(): number;
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}
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```
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**Usage:**
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```typescript
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import { createIDBPersistence } from './lib/collaboration/idb-persistence';
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const persistence = createIDBPersistence(doc, {
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dbName: 'frenocorp-yjs',
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autoSave: true,
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saveIntervalMs: 5000,
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});
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// Auto-save every 5 seconds
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persistence.startAutoSave('project-123');
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// Load previous state
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await persistence.loadAndApply('project-123');
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// Handle offline/online
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window.addEventListener('offline', () => persistence.setOnline(false));
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window.addEventListener('online', () => {
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persistence.setOnline(true);
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persistence.flushUpdates('project-123');
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});
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```
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#### 2. Change Highlighting Component (`src/components/collaboration/change-highlighting.tsx`)
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Visual indicators for recent changes in the editor.
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**Features:**
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- Color-coded highlights by user
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- Auto-fade after configurable duration (default: 30s)
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- Toggle highlight visibility
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- Shows insert/delete/format changes
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- Accept/reject status filtering
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- Change count display
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**Props:**
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```typescript
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interface ChangeHighlightingProps {
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doc: Doc;
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changeTracker: ChangeTracker;
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userId: string;
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showAccepted?: boolean;
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showRejected?: boolean;
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highlightDurationMs?: number;
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}
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```
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**Usage:**
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```typescript
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<ChangeHighlighting
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doc={doc}
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changeTracker={changeTracker}
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userId="user-123"
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showAccepted={true}
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highlightDurationMs={30000}
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/>
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```
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#### 3. Version History Panel (`src/components/collaboration/version-history-panel.tsx`)
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Sidebar panel for browsing and restoring document snapshots.
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**Features:**
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- Chronological snapshot list (newest first)
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- Relative timestamps ("5m ago", "2h ago")
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- Snapshot descriptions
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- Author attribution
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- Change count per snapshot
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- Preview before restore
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- One-click restore
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- Manual snapshot creation
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- Auto-refresh
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**Props:**
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```typescript
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interface VersionHistoryPanelProps {
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changeTracker: ChangeTracker;
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onRestore?: (snapshot: Snapshot) => void;
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onClose?: () => void;
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}
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```
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**Usage:**
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```typescript
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<VersionHistoryPanel
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changeTracker={changeTracker}
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onRestore={(snapshot) => {
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console.log('Restored to:', snapshot.description);
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}}
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/>
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```
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### 📊 Phase 5 Progress
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| Task | Status | Notes |
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|------|--------|-------|
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| IndexedDB persistence | ✅ Complete | Offline-first storage |
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| Change highlighting UI | ✅ Complete | Visual change indicators |
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| Version history panel | ✅ Complete | Snapshot browsing/restore |
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| WebSocket message batching | 🔄 Pending | Next priority |
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| Performance benchmarking | 🔄 Pending | After batching |
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| Integration tests | 🔄 Pending | After all components |
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| Conflict detection alerts | 🔄 Pending | UI notification system |
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| Bandwidth throttling | 🔄 Pending | Dev tool for testing |
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### 📁 Files Created
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```
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src/lib/collaboration/
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└── idb-persistence.ts # IndexedDB persistence layer (250 lines)
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src/components/collaboration/
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├── change-highlighting.tsx # Change highlighting component (180 lines)
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└── version-history-panel.tsx # Version history sidebar (280 lines)
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```
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### 🔧 Integration Example
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```typescript
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import { Doc } from 'yjs';
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import { ChangeTracker } from './lib/collaboration/change-tracker';
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import { createIDBPersistence } from './lib/collaboration/idb-persistence';
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import { ChangeHighlighting } from './components/collaboration/change-highlighting';
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import { VersionHistoryPanel } from './components/collaboration/version-history-panel';
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// Initialize document
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const doc = new Doc();
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// Initialize change tracker
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const changeTracker = new ChangeTracker(doc, 'user-1', 'John Doe');
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// Initialize persistence
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const persistence = createIDBPersistence(doc, {
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dbName: 'frenocorp-yjs',
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autoSave: true,
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});
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// Load previous state
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await persistence.loadAndApply('project-123');
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persistence.startAutoSave('project-123');
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// Render components
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function App() {
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return (
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<div>
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<ChangeHighlighting
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doc={doc}
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changeTracker={changeTracker}
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userId="user-1"
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/>
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<VersionHistoryPanel
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changeTracker={changeTracker}
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onRestore={() => persistence.save('project-123')}
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/>
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{/* Editor component */}
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</div>
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);
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}
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```
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### 🎯 Next Steps
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1. **WebSocket Message Batching** - Batch multiple updates into single messages
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2. **Performance Benchmarks** - Measure sync latency, memory usage
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3. **Integration Tests** - End-to-end collaboration flow tests
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4. **Conflict Detection Alerts** - Toast notifications for conflicts
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5. **Bandwidth Throttling** - Dev tool for testing poor connections
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### ⚠️ Known Limitations
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1. **IndexedDB browser support** - Works in all modern browsers, but requires polyfill for very old browsers
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2. **Storage quota** - IndexedDB has per-origin quotas (typically 50MB-2GB depending on browser)
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3. **Snapshot size** - Large documents may hit storage limits with many snapshots
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4. **Change highlight performance** - Many simultaneous highlights may impact rendering (mitigated by auto-fade)
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### 📈 Performance Targets
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| Metric | Target | Current |
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|--------|--------|---------|
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| Sync latency | <100ms | TBD |
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| Offline save | <50ms | TBD |
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| Highlight render | <16ms (60fps) | TBD |
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| Snapshot restore | <500ms | TBD |
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| Memory usage | <50MB | TBD |
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---
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**Status:** Phase 5 in progress (3/8 tasks complete)
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**Next:** WebSocket message batching optimization
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