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/merge-logic.ts
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328
src/lib/collaboration/merge-logic.ts
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/**
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* Merge Logic for collaborative screenplay editing
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* Handles complex merge scenarios and screenplay-specific rules
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*/
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import { Doc, Text } from 'yjs';
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import { DocumentChange } from './change-tracker';
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export type MergeStrategy = 'accept-local' | 'accept-remote' | 'manual' | 'auto-merge';
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export interface MergeResult {
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success: boolean;
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strategy: MergeStrategy;
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conflicts: Conflict[];
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appliedChanges: DocumentChange[];
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}
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export interface Conflict {
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id: string;
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type: 'concurrent-edit' | 'format-conflict' | 'structure-conflict';
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localChange: DocumentChange;
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remoteChange: DocumentChange;
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resolution?: Resolution;
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}
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export interface Resolution {
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strategy: MergeStrategy;
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result: 'local' | 'remote' | 'merged';
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resolvedAt: Date;
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resolvedBy: string;
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}
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export interface ServerChange {
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id: string;
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userId: string;
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timestamp: Date;
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type: 'insert' | 'delete' | 'format';
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position: number;
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content?: string;
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length: number;
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}
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export class MergeLogic {
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private doc: Doc;
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private userId: string;
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private pendingConflicts: Conflict[] = [];
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constructor(doc: Doc, userId: string) {
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this.doc = doc;
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this.userId = userId;
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}
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/**
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* Apply a server change to the local document
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*/
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applyServerChange(change: ServerChange): MergeResult {
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const conflicts: Conflict[] = [];
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const appliedChanges: DocumentChange[] = [];
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try {
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this.doc.transact(() => {
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const text = this.doc.getText('main');
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// Check for conflicts with local changes
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const hasConflict = this.detectConflict(change);
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if (hasConflict) {
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const localChange = this.getLastLocalChange();
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if (!localChange) {
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// No local change to conflict with, apply remote change
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this.applyChange(text, change);
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return;
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}
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const conflict: Conflict = {
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id: this.generateConflictId(),
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type: 'concurrent-edit',
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localChange,
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remoteChange: this.convertServerToChange(change),
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};
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conflicts.push(conflict);
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this.pendingConflicts.push(conflict);
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// Auto-resolve simple conflicts
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const resolution = this.autoResolveConflict(conflict);
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if (resolution) {
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conflict.resolution = resolution;
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if (resolution.result === 'local') {
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// Keep local change, ignore remote
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return;
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} else if (resolution.result === 'remote') {
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// Apply remote change
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this.applyChange(text, change);
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} else {
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// Merged - apply both
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this.applyChange(text, change);
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}
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}
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} else {
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// No conflict, apply change directly
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this.applyChange(text, change);
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}
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}, 'server-change');
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return {
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success: conflicts.length === 0,
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strategy: conflicts.length > 0 ? 'auto-merge' : 'accept-remote',
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conflicts,
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appliedChanges,
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};
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} catch (error) {
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console.error('Failed to apply server change:', error);
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return {
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success: false,
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strategy: 'manual',
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conflicts,
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appliedChanges,
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};
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}
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}
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/**
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* Apply a change to the text document
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*/
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private applyChange(text: Text, change: ServerChange): void {
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switch (change.type) {
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case 'insert':
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if (change.content) {
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text.insert(change.position, change.content);
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}
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break;
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case 'delete':
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text.delete(change.position, change.length);
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break;
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case 'format':
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// Format changes would be handled separately
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break;
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}
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}
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/**
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* Detect if a server change conflicts with local changes
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*/
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private detectConflict(change: ServerChange): boolean {
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// Simplified conflict detection
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// In production, would check against pending local changes
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const lastChange = this.getLastLocalChange();
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if (!lastChange) {
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return false;
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}
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// Check if positions overlap
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const positionOverlap =
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change.position >= lastChange.position &&
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change.position < lastChange.position + lastChange.length;
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return positionOverlap;
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}
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/**
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* Get the last local change
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*/
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private getLastLocalChange(): DocumentChange | null {
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// In production, would retrieve from ChangeTracker
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return null;
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}
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/**
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* Convert server change to DocumentChange format
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*/
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private convertServerToChange(serverChange: ServerChange): DocumentChange {
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return {
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id: serverChange.id,
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userId: serverChange.userId,
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userName: 'Remote User',
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timestamp: serverChange.timestamp,
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type: serverChange.type,
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position: serverChange.position,
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length: serverChange.length,
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content: serverChange.content,
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accepted: true,
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};
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}
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/**
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* Auto-resolve simple conflicts
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*/
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private autoResolveConflict(conflict: Conflict): Resolution | null {
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// Auto-resolve non-overlapping edits
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if (conflict.type === 'concurrent-edit') {
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const local = conflict.localChange;
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const remote = conflict.remoteChange;
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// If edits are far apart, no conflict
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const distance = Math.abs(local.position - remote.position);
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if (distance > 10) {
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return {
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strategy: 'auto-merge',
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result: 'merged',
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resolvedAt: new Date(),
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resolvedBy: 'auto',
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};
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}
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// If same user made both changes, accept remote
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if (local.userId === remote.userId) {
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return {
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strategy: 'accept-remote',
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result: 'remote',
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resolvedAt: new Date(),
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resolvedBy: 'auto',
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};
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}
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}
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// Can't auto-resolve, needs manual intervention
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return null;
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}
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/**
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* Handle concurrent edits to the same region
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*/
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handleConcurrentEdit(localChange: DocumentChange, remoteChange: DocumentChange): MergeStrategy {
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// Screenplay-specific merge rules
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// Rule 1: If both changes are in the same scene, prefer structured edits
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if (this.sameScene(localChange, remoteChange)) {
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// If one is formatting and one is content, accept both
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if (localChange.type !== remoteChange.type) {
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return 'auto-merge';
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}
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// If both are content edits, need manual resolution
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return 'manual';
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}
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// Rule 2: If changes are in different scenes, auto-merge
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return 'auto-merge';
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}
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/**
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* Check if two changes are in the same scene
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*/
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private sameScene(change1: DocumentChange, change2: DocumentChange): boolean {
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// In production, would check scene boundaries in the document
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// For now, assume changes within 500 chars are in the same scene
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return Math.abs(change1.position - change2.position) < 500;
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}
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/**
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* Resolve a conflict manually
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*/
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resolveConflict(conflict: Conflict, strategy: MergeStrategy, resolverId: string): boolean {
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const resolution: Resolution = {
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strategy,
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result: strategy === 'accept-local' ? 'local' : strategy === 'accept-remote' ? 'remote' : 'merged',
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resolvedAt: new Date(),
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resolvedBy: resolverId,
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};
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conflict.resolution = resolution;
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// Remove from pending conflicts
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const index = this.pendingConflicts.indexOf(conflict);
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if (index > -1) {
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this.pendingConflicts.splice(index, 1);
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}
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// Apply resolution
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if (resolution.result === 'remote') {
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const text = this.doc.getText('main');
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this.applyChange(text, {
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id: conflict.remoteChange.id,
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userId: conflict.remoteChange.userId,
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timestamp: conflict.remoteChange.timestamp,
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type: conflict.remoteChange.type as 'insert' | 'delete' | 'format',
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position: conflict.remoteChange.position,
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length: conflict.remoteChange.length,
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content: conflict.remoteChange.content,
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});
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}
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return true;
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}
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/**
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* Validate a merge result
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*/
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validateMerge(result: MergeResult): boolean {
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// Check document integrity
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try {
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const text = this.doc.getText('main');
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const content = text.toString();
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// Basic validation: document should not be empty
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if (content.length === 0) {
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return false;
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}
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// Check for corrupted UTF-8 sequences
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try {
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new TextDecoder().decode(new TextEncoder().encode(content));
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return true;
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} catch {
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return false;
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}
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} catch {
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return false;
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}
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}
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/**
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* Get pending conflicts
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*/
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getPendingConflicts(): Conflict[] {
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return [...this.pendingConflicts];
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}
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/**
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* Generate unique conflict ID
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*/
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private generateConflictId(): string {
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return `conflict-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
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}
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}
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