/**
 * Scaled HNSW System - Integration of All Optimization Strategies
 * Production-ready system for handling millions of vectors with sub-second search
 */
import { PartitionedHNSWIndex } from './partitionedHNSWIndex.js';
import { DistributedSearchSystem, SearchStrategy } from './distributedSearch.js';
import { EnhancedCacheManager } from '../storage/enhancedCacheManager.js';
import { BatchS3Operations } from '../storage/adapters/batchS3Operations.js';
import { ReadOnlyOptimizations } from '../storage/readOnlyOptimizations.js';
import { euclideanDistance } from '../utils/index.js';
import { AutoConfiguration } from '../utils/autoConfiguration.js';
/**
 * High-performance HNSW system with all optimizations integrated
 * Handles datasets from thousands to millions of vectors
 */
export class ScaledHNSWSystem {
    constructor(config = {}) {
        // Performance monitoring and learning
        this.performanceMetrics = {
            totalSearches: 0,
            averageSearchTime: 0,
            cacheHitRate: 0,
            compressionRatio: 0,
            memoryUsage: 0,
            indexSize: 0,
            lastLearningUpdate: Date.now()
        };
        this.autoConfig = AutoConfiguration.getInstance();
        // Set basic defaults - these will be overridden by auto-configuration
        this.config = {
            expectedDatasetSize: 100000,
            maxMemoryUsage: 4 * 1024 * 1024 * 1024,
            targetSearchLatency: 150,
            autoConfigureEnvironment: true,
            learningEnabled: true,
            enablePartitioning: true,
            enableCompression: true,
            enableDistributedSearch: true,
            enablePredictiveCaching: true,
            readOnlyMode: false,
            ...config
        };
        this.initializeOptimizedSystem();
    }
    /**
     * Initialize the optimized system based on configuration
     */
    async initializeOptimizedSystem() {
        console.log('Initializing Scaled HNSW System with auto-configuration...');
        // Auto-configure if enabled
        if (this.config.autoConfigureEnvironment) {
            const autoConfigResult = await this.autoConfig.detectAndConfigure({
                expectedDataSize: this.config.expectedDatasetSize,
                s3Available: !!this.config.s3Config,
                memoryBudget: this.config.maxMemoryUsage
            });
            console.log(`Detected environment: ${autoConfigResult.environment}`);
            console.log(`Available memory: ${(autoConfigResult.availableMemory / 1024 / 1024 / 1024).toFixed(1)}GB`);
            console.log(`CPU cores: ${autoConfigResult.cpuCores}`);
            // Override config with auto-detected values
            this.config = {
                ...this.config,
                expectedDatasetSize: autoConfigResult.recommendedConfig.expectedDatasetSize,
                maxMemoryUsage: autoConfigResult.recommendedConfig.maxMemoryUsage,
                targetSearchLatency: autoConfigResult.recommendedConfig.targetSearchLatency,
                enablePartitioning: autoConfigResult.recommendedConfig.enablePartitioning,
                enableCompression: autoConfigResult.recommendedConfig.enableCompression,
                enableDistributedSearch: autoConfigResult.recommendedConfig.enableDistributedSearch,
                enablePredictiveCaching: autoConfigResult.recommendedConfig.enablePredictiveCaching
            };
        }
        // Determine optimal configuration
        const optimizedConfig = this.calculateOptimalConfiguration();
        // Initialize partitioned index with semantic partitioning as default
        if (this.config.enablePartitioning) {
            this.partitionedIndex = new PartitionedHNSWIndex({
                ...optimizedConfig.partitionConfig,
                partitionStrategy: 'semantic', // Always use semantic for better performance
                autoTuneSemanticClusters: true // Enable auto-tuning
            }, optimizedConfig.hnswConfig, euclideanDistance);
            console.log('✓ Partitioned index initialized with semantic clustering');
        }
        // Initialize distributed search system
        if (this.config.enableDistributedSearch && this.partitionedIndex) {
            this.distributedSearch = new DistributedSearchSystem({
                maxConcurrentSearches: optimizedConfig.maxConcurrentSearches,
                searchTimeout: this.config.targetSearchLatency * 5,
                adaptivePartitionSelection: true,
                loadBalancing: true
            });
            console.log('✓ Distributed search system initialized');
        }
        // Initialize batch S3 operations
        if (this.config.s3Config) {
            this.batchOperations = new BatchS3Operations(null, // Would be initialized with actual S3 client
            this.config.s3Config.bucketName, {
                maxConcurrency: 50,
                useS3Select: this.config.expectedDatasetSize > 100000
            });
            console.log('✓ Batch S3 operations initialized');
        }
        // Initialize enhanced caching
        if (this.config.enablePredictiveCaching) {
            this.cacheManager = new EnhancedCacheManager({
                hotCacheMaxSize: optimizedConfig.hotCacheSize,
                warmCacheMaxSize: optimizedConfig.warmCacheSize,
                prefetchEnabled: true,
                prefetchStrategy: 'hybrid', // Type casting for enum compatibility
                prefetchBatchSize: 50
            });
            if (this.batchOperations) {
                this.cacheManager.setStorageAdapters(null, this.batchOperations);
            }
            console.log('✓ Enhanced cache manager initialized');
        }
        // Initialize read-only optimizations
        if (this.config.readOnlyMode && this.config.enableCompression) {
            this.readOnlyOptimizations = new ReadOnlyOptimizations({
                compression: {
                    vectorCompression: 'quantization',
                    metadataCompression: 'gzip',
                    quantizationType: 'scalar',
                    quantizationBits: 8
                },
                segmentSize: optimizedConfig.segmentSize,
                memoryMapped: true,
                cacheIndexInMemory: optimizedConfig.cacheIndexInMemory
            });
            console.log('✓ Read-only optimizations initialized');
        }
        console.log('Scaled HNSW System ready for', this.config.expectedDatasetSize, 'vectors');
    }
    /**
     * Calculate optimal configuration based on dataset size and constraints
     */
    calculateOptimalConfiguration() {
        const size = this.config.expectedDatasetSize;
        const memoryBudget = this.config.maxMemoryUsage;
        let config = {};
        if (size <= 10000) {
            // Small dataset - optimize for speed
            config = {
                partitionConfig: {
                    maxNodesPerPartition: 10000,
                    partitionStrategy: 'hash'
                },
                hnswConfig: {
                    M: 16,
                    efConstruction: 200,
                    efSearch: 50,
                    targetSearchLatency: this.config.targetSearchLatency
                },
                hotCacheSize: 1000,
                warmCacheSize: 5000,
                maxConcurrentSearches: 4,
                segmentSize: 5000,
                cacheIndexInMemory: true
            };
        }
        else if (size <= 100000) {
            // Medium dataset - balance performance and memory
            config = {
                partitionConfig: {
                    maxNodesPerPartition: 25000,
                    partitionStrategy: 'semantic',
                    semanticClusters: 8
                },
                hnswConfig: {
                    M: 24,
                    efConstruction: 300,
                    efSearch: 75,
                    targetSearchLatency: this.config.targetSearchLatency,
                    dynamicParameterTuning: true
                },
                hotCacheSize: 2000,
                warmCacheSize: 15000,
                maxConcurrentSearches: 8,
                segmentSize: 10000,
                cacheIndexInMemory: memoryBudget > 2 * 1024 * 1024 * 1024 // 2GB
            };
        }
        else if (size <= 1000000) {
            // Large dataset - optimize for scale
            config = {
                partitionConfig: {
                    maxNodesPerPartition: 50000,
                    partitionStrategy: 'semantic',
                    semanticClusters: 16
                },
                hnswConfig: {
                    M: 32,
                    efConstruction: 400,
                    efSearch: 100,
                    targetSearchLatency: this.config.targetSearchLatency,
                    dynamicParameterTuning: true,
                    memoryBudget: memoryBudget
                },
                hotCacheSize: 5000,
                warmCacheSize: 25000,
                maxConcurrentSearches: 12,
                segmentSize: 20000,
                cacheIndexInMemory: memoryBudget > 8 * 1024 * 1024 * 1024 // 8GB
            };
        }
        else {
            // Very large dataset - maximum optimization
            config = {
                partitionConfig: {
                    maxNodesPerPartition: 100000,
                    partitionStrategy: 'hybrid',
                    semanticClusters: 32
                },
                hnswConfig: {
                    M: 48,
                    efConstruction: 500,
                    efSearch: 150,
                    targetSearchLatency: this.config.targetSearchLatency,
                    dynamicParameterTuning: true,
                    memoryBudget: memoryBudget,
                    diskCacheEnabled: true
                },
                hotCacheSize: 10000,
                warmCacheSize: 50000,
                maxConcurrentSearches: 20,
                segmentSize: 50000,
                cacheIndexInMemory: false // Too large for memory
            };
        }
        return config;
    }
    /**
     * Add vector to the scaled system
     */
    async addVector(item) {
        if (!this.partitionedIndex) {
            throw new Error('System not properly initialized');
        }
        const startTime = Date.now();
        const result = await this.partitionedIndex.addItem(item);
        // Update performance metrics
        this.performanceMetrics.indexSize = this.partitionedIndex.size();
        return result;
    }
    /**
     * Bulk insert vectors with optimizations
     */
    async bulkInsert(items) {
        if (!this.partitionedIndex) {
            throw new Error('System not properly initialized');
        }
        console.log(`Starting optimized bulk insert of ${items.length} vectors`);
        const startTime = Date.now();
        // Sort items for optimal insertion order
        const sortedItems = this.optimizeInsertionOrder(items);
        const results = [];
        const batchSize = this.calculateOptimalBatchSize(items.length);
        // Process in batches
        for (let i = 0; i < sortedItems.length; i += batchSize) {
            const batch = sortedItems.slice(i, i + batchSize);
            for (const item of batch) {
                const id = await this.partitionedIndex.addItem(item);
                results.push(id);
            }
            // Progress logging
            if (i % (batchSize * 10) === 0) {
                const progress = ((i / sortedItems.length) * 100).toFixed(1);
                console.log(`Bulk insert progress: ${progress}%`);
            }
        }
        const totalTime = Date.now() - startTime;
        console.log(`Bulk insert completed: ${results.length} vectors in ${totalTime}ms`);
        return results;
    }
    /**
     * High-performance vector search with all optimizations
     */
    async search(queryVector, k = 10, options = {}) {
        const startTime = Date.now();
        try {
            let results;
            if (this.distributedSearch && this.partitionedIndex) {
                // Use distributed search for optimal performance
                results = await this.distributedSearch.distributedSearch(this.partitionedIndex, queryVector, k, options.strategy || SearchStrategy.ADAPTIVE);
            }
            else if (this.partitionedIndex) {
                // Fall back to partitioned search
                results = await this.partitionedIndex.search(queryVector, k, { maxPartitions: options.maxPartitions });
            }
            else {
                throw new Error('No search system available');
            }
            // Update performance metrics and learn from performance
            const searchTime = Date.now() - startTime;
            this.updateSearchMetrics(searchTime, results.length);
            // Adaptive learning - adjust configuration based on performance
            if (this.config.learningEnabled && this.shouldTriggerLearning()) {
                await this.adaptivelyLearnFromPerformance();
            }
            return results;
        }
        catch (error) {
            console.error('Search failed:', error);
            throw error;
        }
    }
    /**
     * Get system performance metrics
     */
    getPerformanceMetrics() {
        const metrics = { ...this.performanceMetrics };
        // Add subsystem metrics
        if (this.partitionedIndex) {
            metrics.partitionStats = this.partitionedIndex.getPartitionStats();
        }
        if (this.cacheManager) {
            metrics.cacheStats = this.cacheManager.getStats();
        }
        if (this.readOnlyOptimizations) {
            metrics.compressionStats = this.readOnlyOptimizations.getCompressionStats();
        }
        if (this.distributedSearch) {
            metrics.distributedSearchStats = this.distributedSearch.getSearchStats();
        }
        return metrics;
    }
    /**
     * Optimize insertion order for better index quality
     */
    optimizeInsertionOrder(items) {
        if (items.length < 1000) {
            return items; // Not worth optimizing small batches
        }
        // Simple clustering-based approach for better HNSW construction
        // In production, you might use more sophisticated clustering
        return items.sort(() => Math.random() - 0.5);
    }
    /**
     * Calculate optimal batch size based on system resources
     */
    calculateOptimalBatchSize(totalItems) {
        const memoryBudget = this.config.maxMemoryUsage;
        const estimatedItemSize = 1000; // Rough estimate per item in bytes
        const maxBatch = Math.floor(memoryBudget * 0.1 / estimatedItemSize);
        const targetBatch = Math.min(1000, Math.max(100, maxBatch));
        return Math.min(targetBatch, totalItems);
    }
    /**
     * Update search performance metrics
     */
    updateSearchMetrics(searchTime, resultCount) {
        this.performanceMetrics.totalSearches++;
        this.performanceMetrics.averageSearchTime =
            (this.performanceMetrics.averageSearchTime + searchTime) / 2;
        // Update other metrics
        if (this.cacheManager) {
            const cacheStats = this.cacheManager.getStats();
            const totalOps = cacheStats.hotCacheHits + cacheStats.hotCacheMisses +
                cacheStats.warmCacheHits + cacheStats.warmCacheMisses;
            this.performanceMetrics.cacheHitRate = totalOps > 0 ?
                (cacheStats.hotCacheHits + cacheStats.warmCacheHits) / totalOps : 0;
        }
        if (this.readOnlyOptimizations) {
            const compressionStats = this.readOnlyOptimizations.getCompressionStats();
            this.performanceMetrics.compressionRatio = compressionStats.compressionRatio;
        }
        // Estimate memory usage
        this.performanceMetrics.memoryUsage = this.estimateMemoryUsage();
    }
    /**
     * Estimate current memory usage
     */
    estimateMemoryUsage() {
        let totalMemory = 0;
        if (this.partitionedIndex) {
            // Rough estimate: 1KB per vector
            totalMemory += this.partitionedIndex.size() * 1024;
        }
        if (this.cacheManager) {
            const cacheStats = this.cacheManager.getStats();
            totalMemory += (cacheStats.hotCacheSize + cacheStats.warmCacheSize) * 1024;
        }
        return totalMemory;
    }
    /**
     * Generate performance report
     */
    generatePerformanceReport() {
        const metrics = this.getPerformanceMetrics();
        return `
=== Scaled HNSW System Performance Report ===

Dataset Configuration:
- Expected Size: ${this.config.expectedDatasetSize.toLocaleString()} vectors
- Current Size: ${metrics.indexSize.toLocaleString()} vectors
- Memory Budget: ${(this.config.maxMemoryUsage / 1024 / 1024 / 1024).toFixed(1)}GB
- Target Latency: ${this.config.targetSearchLatency}ms

Performance Metrics:
- Total Searches: ${metrics.totalSearches.toLocaleString()}
- Average Search Time: ${metrics.averageSearchTime.toFixed(1)}ms
- Cache Hit Rate: ${(metrics.cacheHitRate * 100).toFixed(1)}%
- Memory Usage: ${(metrics.memoryUsage / 1024 / 1024).toFixed(1)}MB
- Compression Ratio: ${metrics.compressionRatio ? (metrics.compressionRatio * 100).toFixed(1) + '%' : 'N/A'}

System Status: ${this.getSystemStatus()}
    `.trim();
    }
    /**
     * Get overall system status
     */
    getSystemStatus() {
        const metrics = this.getPerformanceMetrics();
        if (metrics.averageSearchTime <= this.config.targetSearchLatency) {
            return '✅ OPTIMAL';
        }
        else if (metrics.averageSearchTime <= this.config.targetSearchLatency * 2) {
            return '⚠️  ACCEPTABLE';
        }
        else {
            return '❌ NEEDS OPTIMIZATION';
        }
    }
    /**
     * Check if adaptive learning should be triggered
     */
    shouldTriggerLearning() {
        const timeSinceLastLearning = Date.now() - this.performanceMetrics.lastLearningUpdate;
        const minLearningInterval = 30000; // 30 seconds
        const minSearches = 20; // Minimum searches before learning
        return timeSinceLastLearning > minLearningInterval &&
            this.performanceMetrics.totalSearches > minSearches &&
            this.performanceMetrics.totalSearches % 50 === 0; // Learn every 50 searches
    }
    /**
     * Adaptively learn from performance and adjust configuration
     */
    async adaptivelyLearnFromPerformance() {
        try {
            const currentMetrics = {
                averageSearchTime: this.performanceMetrics.averageSearchTime,
                memoryUsage: this.performanceMetrics.memoryUsage,
                cacheHitRate: this.performanceMetrics.cacheHitRate,
                errorRate: 0 // Could be tracked separately
            };
            const adjustments = await this.autoConfig.learnFromPerformance(currentMetrics);
            if (Object.keys(adjustments).length > 0) {
                console.log('🧠 Adaptive learning: Adjusting configuration based on performance');
                // Apply learned adjustments
                let configChanged = false;
                if (adjustments.enableDistributedSearch !== undefined &&
                    adjustments.enableDistributedSearch !== this.config.enableDistributedSearch) {
                    this.config.enableDistributedSearch = adjustments.enableDistributedSearch;
                    configChanged = true;
                }
                if (adjustments.enableCompression !== undefined &&
                    adjustments.enableCompression !== this.config.enableCompression) {
                    this.config.enableCompression = adjustments.enableCompression;
                    configChanged = true;
                }
                if (adjustments.enablePredictiveCaching !== undefined &&
                    adjustments.enablePredictiveCaching !== this.config.enablePredictiveCaching) {
                    this.config.enablePredictiveCaching = adjustments.enablePredictiveCaching;
                    configChanged = true;
                }
                // Apply partition adjustments
                if (adjustments.maxNodesPerPartition &&
                    this.partitionedIndex &&
                    adjustments.maxNodesPerPartition !== this.partitionedIndex.getPartitionStats().averageNodesPerPartition) {
                    // This would require rebuilding the index in a real implementation
                    console.log(`Learning suggests partition size: ${adjustments.maxNodesPerPartition}`);
                }
                if (configChanged) {
                    console.log('✅ Configuration updated based on performance learning');
                }
            }
            this.performanceMetrics.lastLearningUpdate = Date.now();
        }
        catch (error) {
            console.warn('Adaptive learning failed:', error);
        }
    }
    /**
     * Update dataset analysis for better auto-configuration
     */
    async updateDatasetAnalysis(vectorCount, vectorDimension) {
        if (this.config.autoConfigureEnvironment) {
            const analysis = {
                estimatedSize: vectorCount,
                vectorDimension,
                accessPatterns: this.inferAccessPatterns()
            };
            await this.autoConfig.adaptToDataset(analysis);
            console.log(`📊 Dataset analysis updated: ${vectorCount} vectors${vectorDimension ? `, ${vectorDimension}D` : ''}`);
        }
    }
    /**
     * Infer access patterns from current metrics
     */
    inferAccessPatterns() {
        // Simple heuristic - in practice, this would track read/write ratios
        if (this.performanceMetrics.totalSearches > 100) {
            return 'read-heavy';
        }
        return 'balanced';
    }
    /**
     * Cleanup system resources
     */
    cleanup() {
        this.distributedSearch?.cleanup();
        this.cacheManager?.clear();
        this.readOnlyOptimizations?.cleanup();
        this.partitionedIndex?.clear();
        this.autoConfig.resetCache();
        console.log('Scaled HNSW System cleaned up');
    }
}
// Export convenience factory functions
/**
 * Create a fully auto-configured Brainy system - minimal setup required!
 * Just provide S3 config if you want persistence beyond the current session
 */
export function createAutoBrainy(s3Config) {
    return new ScaledHNSWSystem({
        s3Config: s3Config ? {
            bucketName: s3Config.bucketName,
            region: s3Config.region || 'us-east-1',
            accessKeyId: s3Config.accessKeyId,
            secretAccessKey: s3Config.secretAccessKey
        } : undefined,
        autoConfigureEnvironment: true,
        learningEnabled: true
    });
}
/**
 * Create a Brainy system optimized for specific scenarios
 */
export async function createQuickBrainy(scenario, s3Config) {
    const { getQuickSetup } = await import('../utils/autoConfiguration.js');
    const quickConfig = await getQuickSetup(scenario);
    return new ScaledHNSWSystem({
        ...quickConfig,
        s3Config: s3Config && quickConfig.s3Required ? {
            bucketName: s3Config.bucketName,
            region: s3Config.region || 'us-east-1',
            accessKeyId: process.env.AWS_ACCESS_KEY_ID,
            secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY
        } : undefined,
        autoConfigureEnvironment: true,
        learningEnabled: true
    });
}
/**
 * Legacy factory function - still works but consider using createAutoBrainy() instead
 */
export function createScaledHNSWSystem(config = {}) {
    return new ScaledHNSWSystem(config);
}
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