/**
 * HybridBackend - Combines SQLite (structured queries) + AgentDB (vector search)
 *
 * Per ADR-009: "HybridBackend (SQLite + AgentDB) as default"
 * - SQLite for: Structured queries, ACID transactions, exact matches
 * - AgentDB for: Semantic search, vector similarity, RAG
 *
 * @module v3/memory/hybrid-backend
 */
import { EventEmitter } from 'node:events';
import { IMemoryBackend, MemoryEntry, MemoryEntryUpdate, MemoryQuery, SearchOptions, SearchResult, BackendStats, HealthCheckResult, EmbeddingGenerator } from './types.js';
import { SQLiteBackend, SQLiteBackendConfig } from './sqlite-backend.js';
import { AgentDBBackend, AgentDBBackendConfig } from './agentdb-backend.js';
/**
 * Configuration for HybridBackend
 */
export interface HybridBackendConfig {
    /** SQLite configuration */
    sqlite?: Partial<SQLiteBackendConfig>;
    /** AgentDB configuration */
    agentdb?: Partial<AgentDBBackendConfig>;
    /** Default namespace */
    defaultNamespace?: string;
    /** Embedding generator function */
    embeddingGenerator?: EmbeddingGenerator;
    /** Query routing strategy */
    routingStrategy?: 'auto' | 'sqlite-first' | 'agentdb-first';
    /** Enable dual-write (write to both backends) */
    dualWrite?: boolean;
    /** Semantic search threshold for hybrid queries */
    semanticThreshold?: number;
    /** Maximum results to fetch from each backend in hybrid queries */
    hybridMaxResults?: number;
}
/**
 * Structured Query Interface
 * Optimized for SQLite's strengths
 */
export interface StructuredQuery {
    /** Exact key match */
    key?: string;
    /** Key prefix match */
    keyPrefix?: string;
    /** Namespace filter */
    namespace?: string;
    /** Owner filter */
    ownerId?: string;
    /** Type filter */
    type?: string;
    /** Time range filters */
    createdAfter?: number;
    createdBefore?: number;
    updatedAfter?: number;
    updatedBefore?: number;
    /** Pagination */
    limit?: number;
    offset?: number;
}
/**
 * Semantic Query Interface
 * Optimized for AgentDB's vector search
 */
export interface SemanticQuery {
    /** Content to search for (will be embedded) */
    content?: string;
    /** Pre-computed embedding */
    embedding?: Float32Array;
    /** Number of results */
    k?: number;
    /** Similarity threshold (0-1) */
    threshold?: number;
    /** Additional filters */
    filters?: Partial<MemoryQuery>;
}
/**
 * Hybrid Query Interface
 * Combines structured + semantic search
 */
export interface HybridQuery {
    /** Semantic component */
    semantic: SemanticQuery;
    /** Structured component */
    structured?: StructuredQuery;
    /** How to combine results */
    combineStrategy?: 'union' | 'intersection' | 'semantic-first' | 'structured-first';
    /** Weights for score combination */
    weights?: {
        semantic: number;
        structured: number;
    };
}
/**
 * HybridBackend Implementation
 *
 * Intelligently routes queries between SQLite and AgentDB:
 * - Exact matches, prefix queries → SQLite
 * - Semantic search, similarity → AgentDB
 * - Complex hybrid queries → Both backends with intelligent merging
 */
export declare class HybridBackend extends EventEmitter implements IMemoryBackend {
    private sqlite;
    private agentdb;
    private config;
    private initialized;
    private stats;
    constructor(config?: HybridBackendConfig);
    /**
     * Initialize both backends
     */
    initialize(): Promise<void>;
    /**
     * Shutdown both backends
     */
    shutdown(): Promise<void>;
    /**
     * Store in both backends (dual-write for consistency)
     */
    store(entry: MemoryEntry): Promise<void>;
    /**
     * Get from AgentDB (has caching enabled)
     */
    get(id: string): Promise<MemoryEntry | null>;
    /**
     * Get by key (SQLite optimized for exact matches)
     */
    getByKey(namespace: string, key: string): Promise<MemoryEntry | null>;
    /**
     * Update in both backends
     */
    update(id: string, update: MemoryEntryUpdate): Promise<MemoryEntry | null>;
    /**
     * Delete from both backends
     */
    delete(id: string): Promise<boolean>;
    /**
     * Query routing - semantic goes to AgentDB, structured to SQLite
     */
    query(query: MemoryQuery): Promise<MemoryEntry[]>;
    /**
     * Structured queries (SQL)
     * Routes to SQLite for optimal performance
     */
    queryStructured(query: StructuredQuery): Promise<MemoryEntry[]>;
    /**
     * Semantic queries (vector)
     * Routes to AgentDB for HNSW-based vector search
     */
    querySemantic(query: SemanticQuery): Promise<MemoryEntry[]>;
    /**
     * Hybrid queries (combine both)
     * Intelligently merges results from both backends
     */
    queryHybrid(query: HybridQuery): Promise<MemoryEntry[]>;
    /**
     * Semantic vector search (routes to AgentDB)
     */
    search(embedding: Float32Array, options: SearchOptions): Promise<SearchResult[]>;
    /**
     * Bulk insert to both backends
     */
    bulkInsert(entries: MemoryEntry[]): Promise<void>;
    /**
     * Bulk delete from both backends
     */
    bulkDelete(ids: string[]): Promise<number>;
    /**
     * Count entries (use SQLite for efficiency)
     */
    count(namespace?: string): Promise<number>;
    /**
     * List namespaces (use SQLite)
     */
    listNamespaces(): Promise<string[]>;
    /**
     * Clear namespace in both backends
     */
    clearNamespace(namespace: string): Promise<number>;
    /**
     * Get combined statistics from both backends
     */
    getStats(): Promise<BackendStats>;
    /**
     * Health check for both backends
     */
    healthCheck(): Promise<HealthCheckResult>;
    /**
     * Auto-route queries based on properties
     */
    private autoRoute;
    /**
     * Internal hybrid query implementation
     */
    private queryHybridInternal;
    /**
     * Combine results using union (all unique results)
     */
    private combineUnion;
    /**
     * Combine results using intersection (only common results)
     */
    private combineIntersection;
    /**
     * Semantic-first: Prefer semantic results, add structured if not present
     */
    private combineSemanticFirst;
    /**
     * Structured-first: Prefer structured results, add semantic if not present
     */
    private combineStructuredFirst;
    /**
     * Record feedback for a memory entry.
     * Delegates to AgentDB's recordFeedback when available.
     * Gracefully degrades to a no-op when AgentDB is unavailable.
     */
    recordFeedback(entryId: string, feedback: {
        score: number;
        label?: string;
        context?: Record<string, unknown>;
    }): Promise<boolean>;
    /**
     * Verify a witness chain for a memory entry.
     * Delegates to AgentDB's verifyWitnessChain when available.
     */
    verifyWitnessChain(entryId: string): Promise<{
        valid: boolean;
        chainLength: number;
        errors: string[];
    }>;
    /**
     * Get the witness chain for a memory entry.
     * Delegates to AgentDB's getWitnessChain when available.
     */
    getWitnessChain(entryId: string): Promise<Array<{
        hash: string;
        timestamp: number;
        operation: string;
    }>>;
    /**
     * Get underlying backends for advanced operations
     */
    getSQLiteBackend(): SQLiteBackend;
    getAgentDBBackend(): AgentDBBackend;
}
export default HybridBackend;
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