import type { EmbeddingsInterface } from "@langchain/core/embeddings";
import { VectorStore, MaxMarginalRelevanceSearchOptions } from "@langchain/core/vectorstores";
import { Document } from "@langchain/core/documents";
export type DistanceStrategy = "euclidean" | "cosine";
type ComparisonRValue = string | number | boolean | Date | Array<ComparisonRValue>;
type Comparator = "$eq" | "$ne" | "$lt" | "$lte" | "$gt" | "$gte" | "$in" | "$nin" | "$between" | "$like";
type ComparatorFilter = {
    [K in Comparator]?: ComparisonRValue;
};
type LogicalOperator = "$and" | "$or";
type LogicalFilter = {
    [K in LogicalOperator]?: Filter[];
};
type PropertyFilter = {
    [property: string]: string | number | boolean | Date | ComparatorFilter;
};
type Filter = PropertyFilter | LogicalFilter;
/**
 * Interface defining the arguments required to create an instance of
 * `HanaDB`.
 */
export interface HanaDBArgs {
    connection: any;
    distanceStrategy?: DistanceStrategy;
    tableName?: string;
    contentColumn?: string;
    metadataColumn?: string;
    vectorColumn?: string;
    vectorColumnLength?: number;
    specificMetadataColumns?: string[];
}
export declare class HanaDB extends VectorStore {
    private connection;
    private distanceStrategy;
    private static compiledPattern;
    private tableName;
    private contentColumn;
    private metadataColumn;
    private vectorColumn;
    private vectorColumnLength;
    FilterType: Filter;
    private specificMetadataColumns;
    _vectorstoreType(): string;
    constructor(embeddings: EmbeddingsInterface, args: HanaDBArgs);
    private executeQuery;
    private prepareQuery;
    private executeStatement;
    initialize(): Promise<void>;
    /**
     * Sanitizes the input string by removing characters that are not alphanumeric or underscores.
     * @param inputStr The string to be sanitized.
     * @returns The sanitized string.
     */
    static sanitizeName(inputStr: string): string;
    static escapeSqlIdentifier(inputStr: string): string;
    /**
     * Sanitizes the input to integer. Throws an error if the value is less than lower bound.
     * @param inputInt The input to be sanitized.
     * @returns The sanitized integer.
     */
    static sanitizeInt(inputInt: number | string, lowerBound?: number): number;
    /**
     * Sanitizes a list to ensure all elements are floats (numbers in TypeScript).
     * Throws an error if any element is not a number.
     *
     * @param {number[]} embedding - The array of numbers (floats) to be sanitized.
     * @returns {number[]} The sanitized array of numbers (floats).
     * @throws {Error} Throws an error if any element is not a number.
     */
    static sanitizeListFloat(embedding: number[]): number[];
    /**
     * Sanitizes the keys of the metadata object to ensure they match the required pattern.
     * Throws an error if any key does not match the pattern.
     *
     * @param {Record<string, any>} metadata - The metadata object with keys to be validated.
     * @returns {object[] | object} The original metadata object if all keys are valid.
     * @throws {Error} Throws an error if any metadata key is invalid.
     */
    private sanitizeMetadataKeys;
    /**
     * Parses a string representation of a float array and returns an array of numbers.
     * @param {string} arrayAsString - The string representation of the array.
     * @returns {number[]} An array of floats parsed from the string.
     */
    static parseFloatArrayFromString(arrayAsString: string): number[];
    /**
     * Checks if the specified column exists in the table and validates its data type and length.
     * @param tableName The name of the table.
     * @param columnName The name of the column to check.
     * @param columnType The expected data type(s) of the column.
     * @param columnLength The expected length of the column. Optional.
     */
    checkColumn(tableName: string, columnName: string, columnType: string | string[], columnLength?: number): Promise<void>;
    private createTableIfNotExists;
    tableExists(tableName: string): Promise<boolean>;
    /**
     * Creates a WHERE clause based on the provided filter object.
     * @param filter - A filter object with keys as metadata fields and values as filter values.
     * @returns A tuple containing the WHERE clause string and an array of query parameters.
     */
    private createWhereByFilter;
    /**
     * Processes a filter object to generate SQL WHERE clause components.
     * @param filter - A filter object with keys as metadata fields and values as filter values.
     * @returns A tuple containing the WHERE clause string and an array of query parameters.
     */
    private processFilterObject;
    /**
     * Creates an HNSW vector index on a specified table and vector column with
     * optional build and search configurations. If no configurations are provided,
     * default parameters from the database are used. If provided values exceed the
     * valid ranges, an error will be raised.
     * The index is always created in ONLINE mode.
     *
     * @param {object} options Object containing configuration options for the index
     * @param {number} [options.m] (Optional) Maximum number of neighbors per graph node (Valid Range: [4, 1000])
     * @param {number} [options.efConstruction] (Optional) Maximal candidates to consider when building the graph
     *                                           (Valid Range: [1, 100000])
     * @param {number} [options.efSearch] (Optional) Minimum candidates for top-k-nearest neighbor queries
     *                                     (Valid Range: [1, 100000])
     * @param {string} [options.indexName] (Optional) Custom index name. Defaults to <table_name>_<distance_strategy>_idx
     * @returns {Promise<void>} Promise that resolves when index is added.
     */
    createHnswIndex(options?: {
        m?: number;
        efConstruction?: number;
        efSearch?: number;
        indexName?: string;
    }): Promise<void>;
    /**
     * Deletes entries from the table based on the provided filter.
     * @param ids - Optional. Deletion by ids is not supported and will throw an error.
     * @param filter - Optional. A filter object to specify which entries to delete.
     * @throws Error if 'ids' parameter is provided, as deletion by ids is not supported.
     * @throws Error if 'filter' parameter is not provided, as it is required for deletion.
     * to do: adjust the call signature
     */
    delete(options: {
        ids?: string[];
        filter?: Filter;
    }): Promise<void>;
    /**
     * Static method to create a HanaDB instance from raw texts. This method embeds the documents,
     * creates a table if it does not exist, and adds the documents to the table.
     * @param texts Array of text documents to add.
     * @param metadatas metadata for each text document.
     * @param embedding EmbeddingsInterface instance for document embedding.
     * @param dbConfig Configuration for the HanaDB.
     * @returns A Promise that resolves to an instance of HanaDB.
     */
    static fromTexts(texts: string[], metadatas: object[] | object, embeddings: EmbeddingsInterface, dbConfig: HanaDBArgs): Promise<HanaDB>;
    /**
     * Creates an instance of `HanaDB` from an array of
     * Document instances. The documents are added to the database.
     * @param docs List of documents to be converted to vectors.
     * @param embeddings Embeddings instance used to convert the documents to vectors.
     * @param dbConfig Configuration for the HanaDB.
     * @returns Promise that resolves to an instance of `HanaDB`.
     */
    static fromDocuments(docs: Document[], embeddings: EmbeddingsInterface, dbConfig: HanaDBArgs): Promise<HanaDB>;
    /**
     * Adds an array of documents to the table. The documents are first
     * converted to vectors using the `embedDocuments` method of the
     * `embeddings` instance.
     * @param documents Array of Document instances to be added to the table.
     * @returns Promise that resolves when the documents are added.
     */
    addDocuments(documents: Document[]): Promise<void>;
    /**
     * Adds an array of vectors and corresponding documents to the database.
     * The vectors and documents are batch inserted into the database.
     * @param vectors Array of vectors to be added to the table.
     * @param documents Array of Document instances corresponding to the vectors.
     * @returns Promise that resolves when the vectors and documents are added.
     */
    addVectors(vectors: number[][], documents: Document[]): Promise<void>;
    /**
       * Return docs most similar to query.
       * @param query Query text for the similarity search.
       * @param k Number of Documents to return. Defaults to 4.
       * @param filter A dictionary of metadata fields and values to filter by.
                      Defaults to None.
       * @returns Promise that resolves to a list of documents and their corresponding similarity scores.
       */
    similaritySearch(query: string, k: number, filter?: this["FilterType"]): Promise<Document[]>;
    /**
       * Return documents and score values most similar to query.
       * @param query Query text for the similarity search.
       * @param k Number of Documents to return. Defaults to 4.
       * @param filter A dictionary of metadata fields and values to filter by.
                      Defaults to None.
       * @returns Promise that resolves to a list of documents and their corresponding similarity scores.
       */
    similaritySearchWithScore(query: string, k: number, filter?: this["FilterType"]): Promise<[Document, number][]>;
    /**
       * Return docs most similar to the given embedding.
       * @param query Query embedding for the similarity search.
       * @param k Number of Documents to return. Defaults to 4.
       * @param filter A dictionary of metadata fields and values to filter by.
                      Defaults to None.
       * @returns Promise that resolves to a list of documents and their corresponding similarity scores.
       */
    similaritySearchVectorWithScore(queryEmbedding: number[], k: number, filter?: this["FilterType"]): Promise<[Document, number][]>;
    /**
     * Performs a similarity search based on vector comparison and returns documents along with their similarity scores and vectors.
     * @param embedding The vector representation of the query for similarity comparison.
     * @param k The number of top similar documents to return.
     * @param filter Optional filter criteria to apply to the search query.
     * @returns A promise that resolves to an array of tuples, each containing a Document, its similarity score, and its vector.
     */
    similaritySearchWithScoreAndVectorByVector(embedding: number[], k: number, filter?: this["FilterType"]): Promise<Array<[Document, number, number[]]>>;
    /**
     * Return documents selected using the maximal marginal relevance.
     * Maximal marginal relevance optimizes for similarity to the query AND
     * diversity among selected documents.
     * @param query Text to look up documents similar to.
     * @param options.k Number of documents to return.
     * @param options.fetchK=20 Number of documents to fetch before passing to
     *     the MMR algorithm.
     * @param options.lambda=0.5 Number between 0 and 1 that determines the
     *     degree of diversity among the results, where 0 corresponds to maximum
     *     diversity and 1 to minimum diversity.
     * @returns List of documents selected by maximal marginal relevance.
     */
    maxMarginalRelevanceSearch(query: string, options: MaxMarginalRelevanceSearchOptions<this["FilterType"]>): Promise<Document[]>;
}
export {};
