import * as sqlite3 from 'sqlite3';
import { VssLoader } from './vss-loader';
/**
 * Manages VSS Virtual Table for vector similarity search.
 * Creates and maintains the embeddings_vss virtual table.
 */
export declare class VssManager {
    private db;
    private vssLoader;
    private vssAvailable;
    constructor(db: sqlite3.Database, vssLoader: VssLoader);
    /**
     * Initializes VSS Virtual Table.
     * Must be called after VSS extension is loaded.
     *
     * @returns Promise that resolves when VSS is initialized
     */
    initialize(): Promise<void>;
    /**
     * Checks if VSS virtual table exists.
     */
    private checkTableExists;
    /**
     * Creates the VSS virtual table.
     */
    private createVirtualTable;
    /**
     * Inserts or updates an embedding in the VSS virtual table.
     * VSS uses rowid to link to the embeddings table.
     *
     * @param embeddingId The embedding ID (UUID) from the embeddings table
     * @param embeddingVector The embedding vector as Float32Array or Buffer
     */
    upsertEmbedding(embeddingId: string, embeddingVector: Float32Array | Buffer): Promise<void>;
    /**
     * Gets rowid from embedding ID.
     */
    private getRowidFromEmbeddingId;
    /**
     * Checks if a row exists in VSS virtual table.
     */
    private checkRowExists;
    /**
     * Inserts a new embedding into VSS virtual table.
     * VSS expects the vector as a JSON array or BLOB.
     */
    private insertEmbedding;
    /**
     * Deletes an embedding from VSS virtual table by embedding ID.
     *
     * @param embeddingId The embedding ID (UUID) from the embeddings table
     */
    deleteEmbedding(embeddingId: string): Promise<void>;
    /**
     * Deletes an embedding from VSS virtual table by rowid.
     */
    private deleteEmbeddingByRowid;
    /**
     * Performs vector similarity search using VSS.
     *
     * @param queryVector The query embedding vector
     * @param limit Maximum number of results
     * @param dimension Optional dimension filter
     * @param pluginId Plugin ID filter
     * @returns Promise that resolves to array of {rowid, distance, similarity} pairs
     */
    search(queryVector: number[], limit?: number, dimension?: 'X' | 'Y' | 'Z' | 'W' | 'T', pluginId?: string): Promise<Array<{
        rowid: number;
        distance: number;
        similarity: number;
    }>>;
    /**
     * Alternative VSS search syntax (fallback).
     */
    private tryAlternativeSearch;
    /**
     * Checks if VSS is available and initialized.
     */
    isAvailable(): boolean;
}
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