/**
 * AgentDB Backend - Integration with agentdb@2.0.0-alpha.3.4
 *
 * Provides IMemoryBackend implementation using AgentDB with:
 * - HNSW vector search (150x-12,500x faster than brute-force)
 * - Native or WASM backend support with graceful fallback
 * - Optional dependency handling (works without hnswlib-node)
 * - Seamless integration with HybridBackend
 *
 * @module v3/memory/agentdb-backend
 */
import { EventEmitter } from 'node:events';
import { IMemoryBackend, MemoryEntry, MemoryEntryUpdate, MemoryQuery, SearchOptions, SearchResult, BackendStats, HealthCheckResult, EmbeddingGenerator } from './types.js';
/**
 * Configuration for AgentDB Backend
 */
export interface AgentDBBackendConfig {
    /** Database path for persistence */
    dbPath?: string;
    /** Namespace for memory organization */
    namespace?: string;
    /** Force WASM backend (skip native hnswlib) */
    forceWasm?: boolean;
    /** Vector backend: 'auto', 'ruvector', 'hnswlib' */
    vectorBackend?: 'auto' | 'ruvector' | 'hnswlib';
    /** Vector dimensions (default: 1536) */
    vectorDimension?: number;
    /** HNSW M parameter */
    hnswM?: number;
    /** HNSW efConstruction parameter */
    hnswEfConstruction?: number;
    /** HNSW efSearch parameter */
    hnswEfSearch?: number;
    /** Enable caching */
    cacheEnabled?: boolean;
    /** Embedding generator function */
    embeddingGenerator?: EmbeddingGenerator;
    /** Maximum entries */
    maxEntries?: number;
}
/**
 * AgentDB Backend
 *
 * Integrates AgentDB for vector search with the V3 memory system.
 * Provides 150x-12,500x faster search compared to brute-force approaches.
 *
 * Features:
 * - HNSW indexing for fast approximate nearest neighbor search
 * - Automatic fallback: native hnswlib → ruvector → WASM
 * - Graceful handling of optional native dependencies
 * - Semantic search with filtering
 * - Compatible with HybridBackend for combined SQLite+AgentDB queries
 */
export declare class AgentDBBackend extends EventEmitter implements IMemoryBackend {
    private config;
    private agentdb;
    private initialized;
    private available;
    private entries;
    private namespaceIndex;
    private keyIndex;
    private numericToStringIdMap;
    private stats;
    constructor(config?: AgentDBBackendConfig);
    /**
     * Initialize AgentDB
     */
    initialize(): Promise<void>;
    /**
     * Shutdown AgentDB
     */
    shutdown(): Promise<void>;
    /**
     * Store a memory entry
     */
    store(entry: MemoryEntry): Promise<void>;
    /**
     * Get entry by ID
     */
    get(id: string): Promise<MemoryEntry | null>;
    /**
     * Get entry by key
     */
    getByKey(namespace: string, key: string): Promise<MemoryEntry | null>;
    /**
     * Update entry
     */
    update(id: string, update: MemoryEntryUpdate): Promise<MemoryEntry | null>;
    /**
     * Delete entry
     */
    delete(id: string): Promise<boolean>;
    /**
     * Query entries
     */
    query(query: MemoryQuery): Promise<MemoryEntry[]>;
    /**
     * Semantic vector search
     */
    search(embedding: Float32Array, options: SearchOptions): Promise<SearchResult[]>;
    /**
     * Bulk insert
     */
    bulkInsert(entries: MemoryEntry[]): Promise<void>;
    /**
     * Bulk delete
     */
    bulkDelete(ids: string[]): Promise<number>;
    /**
     * Count entries
     */
    count(namespace?: string): Promise<number>;
    /**
     * List namespaces
     */
    listNamespaces(): Promise<string[]>;
    /**
     * Clear namespace
     */
    clearNamespace(namespace: string): Promise<number>;
    /**
     * Get statistics
     */
    getStats(): Promise<BackendStats>;
    /**
     * Health check
     */
    healthCheck(): Promise<HealthCheckResult>;
    /**
     * Create database schema
     */
    private createSchema;
    /**
     * Store entry in AgentDB
     */
    private storeInAgentDB;
    /**
     * Get entry from AgentDB
     */
    private getFromAgentDB;
    /**
     * Convert agentdb data to MemoryEntry
     */
    private dataToEntry;
    /**
     * Update entry in AgentDB
     */
    private updateInAgentDB;
    /**
     * Delete entry from AgentDB
     */
    private deleteFromAgentDB;
    /**
     * Search with AgentDB HNSW
     */
    private searchWithAgentDB;
    /**
     * Brute-force vector search fallback
     */
    private bruteForceSearch;
    /**
     * Semantic search helper
     */
    private semanticSearch;
    /**
     * In-memory query fallback
     */
    private queryInMemory;
    /**
     * Update in-memory indexes
     */
    private updateIndexes;
    /**
     * Convert DB row to MemoryEntry
     */
    private rowToEntry;
    /**
     * Convert string ID to numeric for HNSW
     */
    private stringIdToNumeric;
    /**
     * Convert numeric ID back to string using O(1) reverse lookup
     * PERFORMANCE FIX: Uses pre-built reverse map instead of O(n) linear scan
     */
    private numericIdToString;
    /**
     * Register string ID in reverse lookup map
     * Called when storing entries to maintain bidirectional mapping
     */
    private registerIdMapping;
    /**
     * Unregister string ID from reverse lookup map
     * Called when deleting entries
     */
    private unregisterIdMapping;
    /**
     * Cosine similarity (returns value in range [0, 1] where 1 = identical)
     */
    private cosineSimilarity;
    /**
     * Estimate memory usage
     */
    private estimateMemoryUsage;
    /**
     * Check if AgentDB is available
     */
    isAvailable(): boolean;
    /**
     * Get underlying AgentDB instance
     */
    getAgentDB(): any;
}
export default AgentDBBackend;
//# sourceMappingURL=agentdb-backend.d.ts.map