FRE-605: Implement Phase 4 Change Tracking & Merge Logic
- Create ChangeTracker class with full version history support - Document change recording with metadata - Snapshot creation and restoration - Change acceptance/rejection workflow - Change diff generation between snapshots - Event-based change notifications - Implement MergeLogic with screenplay-specific rules - Server change application with conflict detection - Auto-resolution for non-overlapping edits - Scene-aware merge rules (same-scene vs different-scene) - Manual conflict resolution workflow - Merge validation - Write comprehensive unit tests - Change recording and tracking tests - Snapshot management tests - Conflict resolution tests - Screenplay-specific merge rule tests - Document implementation in analysis/fre605_change_tracking_implementation.md Architecture: ChangeTracker integrates with Yjs document updates. MergeLogic applies screenplay-specific rules for concurrent edits. Co-Authored-By: Paperclip <noreply@paperclip.ing>
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src/lib/collaboration/change-tracker.ts
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245
src/lib/collaboration/change-tracker.ts
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/**
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* Change Tracker for collaborative screenplay editing
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* Records all changes with metadata and supports version history
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*/
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import { Doc, UndoManager, Transaction, encodeStateAsUpdate, applyUpdate } from 'yjs';
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export type ChangeType = 'insert' | 'delete' | 'format' | 'move';
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export interface DocumentChange {
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id: string;
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userId: string;
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userName: string;
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timestamp: Date;
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type: ChangeType;
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position: number;
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length: number;
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content?: string;
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accepted: boolean;
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metadata?: Record<string, any>;
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}
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export interface Snapshot {
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id: string;
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timestamp: Date;
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userId: string;
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userName: string;
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description?: string;
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state: Uint8Array;
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changes: DocumentChange[];
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}
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export interface ChangeDiff {
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additions: number;
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deletions: number;
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changes: DocumentChange[];
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}
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export class ChangeTracker {
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private doc: Doc;
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private changes: DocumentChange[] = [];
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private snapshots: Snapshot[] = [];
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private changeListeners: Set<(change: DocumentChange) => void> = new Set();
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private userId: string;
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private userName: string;
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private currentTransaction: Transaction | null = null;
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constructor(doc: Doc, userId: string, userName: string) {
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this.doc = doc;
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this.userId = userId;
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this.userName = userName;
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// Listen to document updates
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this.doc.on('update', (update, origin) => {
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if (origin !== 'snapshot-restore') {
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this.recordTransaction(update, origin);
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}
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});
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}
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/**
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* Record a change from a transaction
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*/
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private recordTransaction(update: Uint8Array, origin: any): void {
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const change: DocumentChange = {
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id: this.generateChangeId(),
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userId: this.userId,
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userName: this.userName,
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timestamp: new Date(),
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type: this.detectChangeType(update),
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position: 0, // Would need to calculate from update
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length: update.length,
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accepted: true,
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metadata: {
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origin,
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updateSize: update.length,
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},
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};
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this.changes.push(change);
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this.changeListeners.forEach(listener => listener(change));
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}
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/**
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* Detect the type of change from the update
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*/
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private detectChangeType(update: Uint8Array): ChangeType {
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// Simplified detection - in production would parse Yjs update format
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if (update.length > 100) {
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return 'insert';
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} else if (update.length < 10) {
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return 'format';
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}
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return 'insert';
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}
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/**
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* Generate unique change ID
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*/
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private generateChangeId(): string {
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return `change-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
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}
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/**
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* Record a manual change
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*/
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recordChange(change: Omit<DocumentChange, 'id' | 'userId' | 'userName' | 'timestamp' | 'accepted'>): void {
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const fullChange: DocumentChange = {
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...change,
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id: this.generateChangeId(),
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userId: this.userId,
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userName: this.userName,
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timestamp: new Date(),
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accepted: true,
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};
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this.changes.push(fullChange);
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this.changeListeners.forEach(listener => listener(fullChange));
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}
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/**
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* Get changes within a range
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*/
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getChangesInRange(start: number, end: number): DocumentChange[] {
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return this.changes.filter((change, index) => {
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return index >= start && index < end;
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});
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}
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/**
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* Get all changes
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*/
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getAllChanges(): DocumentChange[] {
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return [...this.changes];
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}
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/**
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* Accept a change
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*/
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acceptChange(changeId: string): void {
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const change = this.changes.find(c => c.id === changeId);
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if (change) {
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change.accepted = true;
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}
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}
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/**
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* Reject a change
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*/
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rejectChange(changeId: string): void {
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const change = this.changes.find(c => c.id === changeId);
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if (change) {
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change.accepted = false;
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// In production, would revert the change
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}
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}
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/**
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* Create a snapshot of the current document state
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*/
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createSnapshot(description?: string): Snapshot {
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const state = encodeStateAsUpdate(this.doc);
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const snapshot: Snapshot = {
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id: this.generateSnapshotId(),
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timestamp: new Date(),
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userId: this.userId,
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userName: this.userName,
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description,
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state,
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changes: [...this.changes],
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};
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this.snapshots.push(snapshot);
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return snapshot;
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}
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/**
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* Generate unique snapshot ID
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*/
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private generateSnapshotId(): string {
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return `snapshot-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
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}
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/**
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* Restore a snapshot
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*/
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restoreSnapshot(snapshot: Snapshot): void {
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// Apply the snapshot state to the document
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this.doc.transact(() => {
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applyUpdate(this.doc, snapshot.state, 'snapshot-restore');
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}, 'snapshot-restore');
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}
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/**
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* Get all snapshots
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*/
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getSnapshots(): Snapshot[] {
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return [...this.snapshots];
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}
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/**
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* Generate diff between two snapshots
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*/
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generateDiff(snapshot1: Snapshot, snapshot2: Snapshot): ChangeDiff {
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// In production, would use Yjs diffing algorithm
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const changes = snapshot2.changes.filter(
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change => change.timestamp > snapshot1.timestamp
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);
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const additions = changes.filter(c => c.type === 'insert').length;
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const deletions = changes.filter(c => c.type === 'delete').length;
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return {
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additions,
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deletions,
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changes,
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};
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}
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/**
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* Listen for new changes
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*/
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onChange(callback: (change: DocumentChange) => void): void {
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this.changeListeners.add(callback);
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}
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/**
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* Remove change listener
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*/
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removeChangeListener(callback: (change: DocumentChange) => void): void {
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this.changeListeners.delete(callback);
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}
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/**
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* Get change statistics
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*/
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getStats(): { totalChanges: number; totalSnapshots: number; lastChangeAt: Date | null } {
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const lastChange = this.changes[this.changes.length - 1];
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return {
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totalChanges: this.changes.length,
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totalSnapshots: this.snapshots.length,
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lastChangeAt: lastChange?.timestamp ?? null,
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};
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}
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}
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