import * as plugins from '../plugins.js';
/**
 * Configuration options for the unified DCRouter database
 */
export interface IDcRouterDbConfig {
    /** External MongoDB connection URL. If absent, uses embedded LocalSmartDb. */
    mongoDbUrl?: string;
    /** Storage path for embedded LocalSmartDb data (default: ~/.serve.zone/dcrouter/tsmdb) */
    storagePath?: string;
    /** Database name (default: dcrouter) */
    dbName?: string;
    /** Enable debug logging */
    debug?: boolean;
}
/**
 * DcRouterDb - Unified database layer for DCRouter
 *
 * Replaces both StorageManager (flat-file key-value) and CacheDb (embedded MongoDB).
 * All data is stored as smartdata document classes in a single database.
 *
 * Two modes:
 * - **Embedded** (default): Spawns a LocalSmartDb (Rust-based MongoDB-compatible engine)
 * - **External**: Connects to a provided MongoDB URL
 */
export declare class DcRouterDb {
    private static instance;
    private localSmartDb;
    private smartdataDb;
    private options;
    private isStarted;
    constructor(options?: IDcRouterDbConfig);
    /**
     * Get or create the singleton instance
     */
    static getInstance(options?: IDcRouterDbConfig): DcRouterDb;
    /**
     * Reset the singleton instance (useful for testing)
     */
    static resetInstance(): void;
    /**
     * Start the database
     * - If mongoDbUrl is provided, connects directly to external MongoDB
     * - Otherwise, starts an embedded LocalSmartDb instance
     */
    start(): Promise<void>;
    /**
     * Stop the database
     */
    stop(): Promise<void>;
    /**
     * Get the smartdata database instance for @Collection decorators
     */
    getDb(): plugins.smartdata.SmartdataDb;
    /**
     * Check if the database is ready
     */
    isReady(): boolean;
    /**
     * Whether running in embedded mode (LocalSmartDb) vs external MongoDB
     */
    isEmbedded(): boolean;
    /**
     * Get the storage path (only relevant for embedded mode)
     */
    getStoragePath(): string;
    /**
     * Get the database name
     */
    getDbName(): string;
}