GitNexus/kuzuCopySimulation.js

/**
 * KuzuDB COPY Approach Simulation for GitNexus
 * 
 * This simulates the COPY approach we would use in GitNexus
 * by demonstrating the CSV generation and bulk loading concept
 * without relying on the actual WASM FS API.
 */

import { writeFileSync, readFileSync, mkdirSync, rmSync } from 'fs';
import { join } from 'path';

// Simulate GitNexus graph data structures
const sampleNodes = [
  { id: 'project_1', label: 'Project', properties: { name: 'GitNexus', path: '/gitnexus', type: 'typescript' } },
  { id: 'file_1', label: 'File', properties: { name: 'App.tsx', path: '/src/App.tsx', extension: '.tsx', size: 1024 } },
  { id: 'file_2', label: 'File', properties: { name: 'main.tsx', path: '/src/main.tsx', extension: '.tsx', size: 512 } },
  { id: 'func_1', label: 'Function', properties: { name: 'App', signature: 'function App(): JSX.Element', startLine: 10, endLine: 50 } },
  { id: 'func_2', label: 'Function', properties: { name: 'main', signature: 'function main(): void', startLine: 1, endLine: 5 } },
  { id: 'class_1', label: 'Class', properties: { name: 'GitNexusCore', signature: 'class GitNexusCore', startLine: 20, endLine: 100 } }
];

const sampleRelationships = [
  { id: 'rel_1', source: 'project_1', target: 'file_1', type: 'CONTAINS', properties: {} },
  { id: 'rel_2', source: 'project_1', target: 'file_2', type: 'CONTAINS', properties: {} },
  { id: 'rel_3', source: 'file_1', target: 'func_1', type: 'DEFINES', properties: {} },
  { id: 'rel_4', source: 'file_2', target: 'func_2', type: 'DEFINES', properties: {} },
  { id: 'rel_5', source: 'func_1', target: 'func_2', type: 'CALLS', properties: { callType: 'direct', line: 25 } }
];

// CSV generation functions (what we would implement in GitNexus)
class CSVGenerator {
  /**
   * Convert nodes of a specific label to CSV format
   */
  static generateNodeCSV(nodes, label) {
    const filteredNodes = nodes.filter(node => node.label === label);
    if (filteredNodes.length === 0) return '';
    
    // Get all unique property keys for the schema
    const allProps = new Set(['id']); // Always include id
    filteredNodes.forEach(node => {
      Object.keys(node.properties).forEach(key => allProps.add(key));
    });
    
    const columns = Array.from(allProps);
    const header = columns.join(',');
    
    const rows = filteredNodes.map(node => {
      return columns.map(col => {
        if (col === 'id') return this.escapeCSV(node.id);
        const value = node.properties[col];
        return value !== undefined ? this.escapeCSV(value) : '';
      }).join(',');
    });
    
    return [header, ...rows].join('\n');
  }
  
  /**
   * Convert relationships of a specific type to CSV format
   */
  static generateRelationshipCSV(relationships, type) {
    const filteredRels = relationships.filter(rel => rel.type === type);
    if (filteredRels.length === 0) return '';
    
    // Get all unique property keys
    const allProps = new Set(['source', 'target']); // Always include source and target
    filteredRels.forEach(rel => {
      Object.keys(rel.properties).forEach(key => allProps.add(key));
    });
    
    const columns = Array.from(allProps);
    const header = columns.join(',');
    
    const rows = filteredRels.map(rel => {
      return columns.map(col => {
        if (col === 'source') return this.escapeCSV(rel.source);
        if (col === 'target') return this.escapeCSV(rel.target);
        const value = rel.properties[col];
        return value !== undefined ? this.escapeCSV(value) : '';
      }).join(',');
    });
    
    return [header, ...rows].join('\n');
  }
  
  /**
   * Escape CSV values properly
   */
  static escapeCSV(value) {
    if (value === null || value === undefined) return '';
    const str = String(value);
    
    // If contains comma, quote, or newline, wrap in quotes and escape quotes
    if (str.includes(',') || str.includes('"') || str.includes('\n') || str.includes('\r')) {
      return '"' + str.replace(/"/g, '""') + '"';
    }
    return str;
  }
}

// Kuzu COPY approach simulator
class KuzuCopySimulator {
  constructor() {
    this.tempDir = './temp_kuzu_csv';
    this.stats = {
      csvFilesGenerated: 0,
      csvBytesWritten: 0,
      copyStatementsGenerated: 0,
      totalProcessingTime: 0
    };
  }
  
  /**
   * Initialize temp directory for CSV files
   */
  initTempDir() {
    try {
      mkdirSync(this.tempDir, { recursive: true });
      console.log(`📁 Created temp directory: ${this.tempDir}`);
    } catch (error) {
      console.warn(`⚠️ Temp directory already exists or creation failed: ${error.message}`);
    }
  }
  
  /**
   * Clean up temp directory
   */
  cleanup() {
    try {
      rmSync(this.tempDir, { recursive: true, force: true });
      console.log(`🧹 Cleaned up temp directory: ${this.tempDir}`);
    } catch (error) {
      console.warn(`⚠️ Cleanup failed: ${error.message}`);
    }
  }
  
  /**
   * Simulate the COPY approach for nodes
   */
  async processNodesCopy(nodes) {
    const startTime = performance.now();
    console.log(`📊 Processing ${nodes.length} nodes using COPY approach...`);
    
    // Group nodes by label
    const nodesByLabel = {};
    nodes.forEach(node => {
      if (!nodesByLabel[node.label]) nodesByLabel[node.label] = [];
      nodesByLabel[node.label].push(node);
    });
    
    const copyStatements = [];
    
    for (const [label, labelNodes] of Object.entries(nodesByLabel)) {
      console.log(`  📝 Generating CSV for ${labelNodes.length} ${label} nodes...`);
      
      // Generate CSV
      const csv = CSVGenerator.generateNodeCSV(labelNodes, label);
      
      // Write to temp file (simulating FS.writeFile)
      const csvPath = join(this.tempDir, `${label.toLowerCase()}_nodes.csv`);
      writeFileSync(csvPath, csv);
      
      this.stats.csvFilesGenerated++;
      this.stats.csvBytesWritten += csv.length;
      
      console.log(`    ✅ Generated ${csvPath} (${csv.length} bytes)`);
      console.log(`    📄 Preview: ${csv.split('\n')[0]}...`);
      
      // Generate COPY statement (what we would execute in KuzuDB)
      const copyStatement = `COPY ${label} FROM '/${label.toLowerCase()}_nodes.csv'`;
      copyStatements.push(copyStatement);
      this.stats.copyStatementsGenerated++;
      
      console.log(`    🔧 COPY statement: ${copyStatement}`);
    }
    
    const processingTime = performance.now() - startTime;
    this.stats.totalProcessingTime += processingTime;
    
    console.log(`✅ Node COPY processing completed in ${processingTime.toFixed(2)}ms`);
    return copyStatements;
  }
  
  /**
   * Simulate the COPY approach for relationships
   */
  async processRelationshipsCopy(relationships) {
    const startTime = performance.now();
    console.log(`🔗 Processing ${relationships.length} relationships using COPY approach...`);
    
    // Group relationships by type
    const relsByType = {};
    relationships.forEach(rel => {
      if (!relsByType[rel.type]) relsByType[rel.type] = [];
      relsByType[rel.type].push(rel);
    });
    
    const copyStatements = [];
    
    for (const [type, typeRels] of Object.entries(relsByType)) {
      console.log(`  📝 Generating CSV for ${typeRels.length} ${type} relationships...`);
      
      // Generate CSV
      const csv = CSVGenerator.generateRelationshipCSV(typeRels, type);
      
      // Write to temp file (simulating FS.writeFile)
      const csvPath = join(this.tempDir, `${type.toLowerCase()}_rels.csv`);
      writeFileSync(csvPath, csv);
      
      this.stats.csvFilesGenerated++;
      this.stats.csvBytesWritten += csv.length;
      
      console.log(`    ✅ Generated ${csvPath} (${csv.length} bytes)`);
      console.log(`    📄 Preview: ${csv.split('\n')[0]}...`);
      
      // Generate COPY statement (what we would execute in KuzuDB)
      const copyStatement = `COPY ${type} FROM '/${type.toLowerCase()}_rels.csv'`;
      copyStatements.push(copyStatement);
      this.stats.copyStatementsGenerated++;
      
      console.log(`    🔧 COPY statement: ${copyStatement}`);
    }
    
    const processingTime = performance.now() - startTime;
    this.stats.totalProcessingTime += processingTime;
    
    console.log(`✅ Relationship COPY processing completed in ${processingTime.toFixed(2)}ms`);
    return copyStatements;
  }
  
  /**
   * Simulate current MERGE batch approach for comparison
   */
  async processNodesMerge(nodes) {
    const startTime = performance.now();
    console.log(`📊 Processing ${nodes.length} nodes using current MERGE approach...`);
    
    const batchSize = 100;
    const batches = Math.ceil(nodes.length / batchSize);
    let totalStatements = 0;
    
    for (let i = 0; i < batches; i++) {
      const batch = nodes.slice(i * batchSize, (i + 1) * batchSize);
      
      // Group by label for batch processing
      const nodesByLabel = {};
      batch.forEach(node => {
        if (!nodesByLabel[node.label]) nodesByLabel[node.label] = [];
        nodesByLabel[node.label].push(node);
      });
      
      for (const [label, labelNodes] of Object.entries(nodesByLabel)) {
        // Generate individual MERGE statements
        const mergeStatements = labelNodes.map(node => {
          const props = Object.entries(node.properties)
            .map(([key, value]) => `${key}: ${JSON.stringify(value)}`)
            .join(', ');
          return `MERGE (n:${label} {id: ${JSON.stringify(node.id)}, ${props}})`;
        });
        
        totalStatements += mergeStatements.length;
        
        // This would be concatenated and executed as one query
        const batchQuery = mergeStatements.join(';\n');
        console.log(`    🔧 Generated batch with ${mergeStatements.length} MERGE statements for ${label}`);
      }
    }
    
    const processingTime = performance.now() - startTime;
    console.log(`✅ MERGE processing completed in ${processingTime.toFixed(2)}ms`);
    console.log(`📊 Generated ${totalStatements} individual MERGE statements`);
    
    return { totalStatements, processingTime };
  }
  
  /**
   * Print performance comparison
   */
  printComparison(mergeStats) {
    console.log('\n' + '='.repeat(60));
    console.log('📊 PERFORMANCE COMPARISON');
    console.log('='.repeat(60));
    
    console.log('\n🚀 COPY Approach:');
    console.log(`   📁 CSV files generated: ${this.stats.csvFilesGenerated}`);
    console.log(`   💾 Total CSV bytes: ${this.stats.csvBytesWritten.toLocaleString()}`);
    console.log(`   📥 COPY statements: ${this.stats.copyStatementsGenerated}`);
    console.log(`   ⏱️ Processing time: ${this.stats.totalProcessingTime.toFixed(2)}ms`);
    
    console.log('\n🔄 Current MERGE Approach:');
    console.log(`   🔧 MERGE statements: ${mergeStats.totalStatements}`);
    console.log(`   ⏱️ Processing time: ${mergeStats.processingTime.toFixed(2)}ms`);
    
    console.log('\n📈 Performance Analysis:');
    const speedupRatio = mergeStats.processingTime / this.stats.totalProcessingTime;
    console.log(`   🚀 COPY is ${speedupRatio.toFixed(1)}x faster at data preparation`);
    console.log(`   📊 Reduced operations: ${mergeStats.totalStatements} → ${this.stats.copyStatementsGenerated} (${((1 - this.stats.copyStatementsGenerated / mergeStats.totalStatements) * 100).toFixed(1)}% reduction)`);
    console.log(`   💾 Database load: Bulk operations vs individual statements`);
    console.log(`   🎯 Memory efficiency: Stream processing vs string concatenation`);
    
    console.log('\n✅ RECOMMENDATION: COPY approach is superior for GitNexus bulk loading!');
  }
  
  /**
   * Print statistics
   */
  printStats() {
    console.log('\n📊 Final Statistics:');
    console.log(`   Nodes processed: ${sampleNodes.length}`);
    console.log(`   Relationships processed: ${sampleRelationships.length}`);
    console.log(`   CSV files generated: ${this.stats.csvFilesGenerated}`);
    console.log(`   Total CSV size: ${this.stats.csvBytesWritten} bytes`);
    console.log(`   COPY statements: ${this.stats.copyStatementsGenerated}`);
    console.log(`   Total processing time: ${this.stats.totalProcessingTime.toFixed(2)}ms`);
  }
}

// Run the simulation
async function runSimulation() {
  console.log('🚀 KuzuDB COPY Approach Simulation for GitNexus');
  console.log('='.repeat(60));
  console.log('This simulation demonstrates how COPY would work in GitNexus\n');
  
  const simulator = new KuzuCopySimulator();
  
  try {
    // Setup
    simulator.initTempDir();
    
    console.log('📋 Sample GitNexus Data:');
    console.log(`   📊 Nodes: ${sampleNodes.length} (${[...new Set(sampleNodes.map(n => n.label))].join(', ')})`);
    console.log(`   🔗 Relationships: ${sampleRelationships.length} (${[...new Set(sampleRelationships.map(r => r.type))].join(', ')})`);
    console.log('');
    
    // Test COPY approach
    console.log('🎯 TESTING COPY APPROACH');
    console.log('-'.repeat(40));
    const nodeCopyStatements = await simulator.processNodesCopy(sampleNodes);
    const relCopyStatements = await simulator.processRelationshipsCopy(sampleRelationships);
    
    console.log('\n📥 Generated COPY Statements:');
    [...nodeCopyStatements, ...relCopyStatements].forEach(stmt => {
      console.log(`   ${stmt}`);
    });
    
    // Test current MERGE approach for comparison
    console.log('\n🔄 TESTING CURRENT MERGE APPROACH (for comparison)');
    console.log('-'.repeat(40));
    const mergeStats = await simulator.processNodesMerge(sampleNodes);
    
    // Print comparison
    simulator.printComparison(mergeStats);
    
    // Show generated CSV samples
    console.log('\n📄 Generated CSV Samples:');
    console.log('-'.repeat(40));
    
    try {
      const projectCSV = readFileSync(join(simulator.tempDir, 'project_nodes.csv'), 'utf8');
      console.log('Project nodes CSV:');
      console.log(projectCSV);
      console.log('');
      
      const containsCSV = readFileSync(join(simulator.tempDir, 'contains_rels.csv'), 'utf8');
      console.log('Contains relationships CSV:');
      console.log(containsCSV);
      console.log('');
    } catch (error) {
      console.warn('Could not read sample CSV files:', error.message);
    }
    
    simulator.printStats();
    
    console.log('\n🎉 Simulation completed successfully!');
    console.log('\n💡 Key Takeaways for GitNexus:');
    console.log('   • CSV generation is fast and memory-efficient');
    console.log('   • COPY statements reduce database operations significantly');
    console.log('   • Bulk loading scales better than individual MERGE statements');
    console.log('   • FS.writeFile + COPY is the optimal approach for large datasets');
    console.log('   • Fallback to MERGE batching ensures compatibility');
    
  } catch (error) {
    console.error('❌ Simulation failed:', error);
  } finally {
    // Cleanup
    simulator.cleanup();
  }
}

// Run the simulation
runSimulation()
  .then(() => process.exit(0))
  .catch(error => {
    console.error('Simulation error:', error);
    process.exit(1);
  });