# Version Comparison Tool Implementation Plan  

   ## Core Requirements  
   1. Multi-version timeline visualization  
   2. Three-way merge preview  
   3. Change impact analysis  
   4. Rollback capabilities  
   5. Performance baseline: <500ms for 100-file diffs  

   ## Technical Integration  
   - **Diff Algorithm**  
     Enhance visual-diff-viewer.md component (line 10):  
     ```typescript  
     interface ComparisonEngine {  
         compareVersions(versions: string[]): StructuredDiff[];  
         calculateImpactScore(diffs: StructuredDiff[]): number;  
     }  
     ```  

   - **Model Extensions**  
     Update VersionTag (line 6):  
     ```python  
     class VersionTag(models.Model):  
         comparison_metadata = models.JSONField(default=dict)  # Stores diff stats  
     ```  

   - **API Endpoints**  
     Add to VersionControlViewSet (line 128):  
     ```python  
     @action(detail=False, methods=['post'])  
     def bulk_compare(self, request):  
         """Process multi-version comparisons"""  
     ```  

   ## Performance Strategy  
   | Aspect | Solution | Target |  
   |--------|----------|--------|  
   | Diff computation | Background workers | 90% async processing |  
   | Result caching | Redis cache layer | 5min TTL |  
   | Large files | Chunked processing | 10MB chunks |  
   | UI rendering | Virtualized scrolling | 60fps maintain |  

   ## Phase Plan  
   1. **Week 1**: Core comparison algorithm  
   2. **Week 2**: Timeline visualization UI  
   3. **Week 3**: Performance optimization  
   4. **Week 4**: Rollback safety mechanisms