import { IResourceData, IResourcePaginationMetaData, IResourceQueryOptions, IResourceQueryOptionsOrderBy, IResourceQueryOptionsOrderByDirection } from "../types";
export declare class ResourcePaginationHelper {
    /**
     * Normalizes pagination parameters by calculating the `page` from `skip` if provided,
     * or calculating `skip` from `page` if only `page` is provided.
     *
     * @param {IResourceQueryOptions} options - The pagination options.
     * @param {number} options.limit - The number of records per page.
     * @param {number} optioins.page - The requested page number (optional).
     * @param {number} options.skip - The number of records to skip (optional).
     * @returns {{ page: number, skip: number,limit:number }} The normalized pagination options : "page" and "skip" are calculated from "limit" and "skip" or "page" and "limit" if provided.
     *
     * @example
     * ```typescript
     * normalizePagination({ limit: 10, skip: 20 }); // { page: 3, skip: 20 }
     * normalizePagination({ limit: 10 }); // { page: 1, skip: 0 }
     * normalizePagination({ page: 3, limit: 10 }); // { page: 3, skip: 0 }
     * normalizePagination({ page: 3, skip: 20 }); // { page: 3, skip: 20 }
     * ```
     */
    static normalizePagination(options?: IResourceQueryOptions): {
        page?: undefined;
        skip?: undefined;
        limit?: undefined;
    } | {
        page: number;
        skip: number;
        limit: number;
    };
    /**
     * Normalizes the `orderBy` object from the query options.
     * Ensures the order direction is either 'ASC' or 'DESC' and handles multiple fields.
     *
     * @template DataType - The type of the data being queried.
     *
     * @param {IResourceQueryOptionsOrderBy<DataType>} orderBy - The orderBy property from the query options.
     * @returns  A normalized object suitable for TypeORM's `order` option.
     *
     * @example
     * ```typescript
     * normalizeOrderBy<User>([{ name: 'asc' }, { age: 'desc' }]);
     * // Output: { lastName: 'ASC', firstName: 'DESC' }
     *
     * normalizeOrderBy<User>([{ age: 'asc'}, { createdAt: 'DESC' }]);
     * // Output: { age: 'ASC', createdAt: 'DESC' }
     * ```
     */
    static normalizeOrderBy<DataType = any>(orderBy?: IResourceQueryOptionsOrderBy<DataType>): Partial<{
        [K in keyof DataType]?: IResourceQueryOptionsOrderByDirection | IResourceQueryOptionsOrderBy<DataType[K]>;
    }>;
    /***
     * Determines if result can be paginated based on the provided query options.
     * It checks if the query options have a `limit` property of type number.
     * @param {IResourceQueryOptions} queryOptions - The query options.
     * @returns {boolean} Whether the result can be paginated.
     *
     * @example
     * canPaginateResult({ limit: undefined }); //false
     * canPaginateResult({ limit: 10, skip: 20 }); // true
     * canPaginateResult({ page: 3, limit: 10 }); // true
     * canPaginateResult({ page: 3, skip: 20 }); // true
     */
    static canPaginateResult(queryOptions: IResourceQueryOptions): boolean;
    static getPaginationMetaData(count: number, queryOptions?: IResourceQueryOptions): IResourcePaginationMetaData;
    /***
     * Paginates the result based on the provided options.
     * @param {DataType[]} data - The data to paginate.
     * @param {number} count - The total count of the data.
     * @param {IResourceQueryOptions} options - The pagination options.
     * @returns {IResourcePaginatedResult<DataType>} The paginated result.
     */
    static paginate<DataType extends IResourceData = any>(data: DataType[], count: number, options?: IResourceQueryOptions): {
        data: DataType[];
        total: number;
        meta: IResourcePaginationMetaData;
    };
    /**
     * Parses query options from the provided request object.
     * It extracts query parameters, headers, and other relevant information to construct a query options object.
     * @template T The type of resource data.
     * @param req The request object containing the URL and headers.
     * @returns {IResourceQueryOptions<T> & {queryParams: Record<string, any>}} The parsed query options object.
     *
     * @example
     * const req = { url: '/api/resources?limit=10&skip=5', headers: { 'x-filters': { limit: 10, skip: 5 } } };
     * const queryOptions = parseQueryOptions(req);
     */
    static parseQueryOptions<T extends IResourceData = IResourceData>(req: {
        url: string;
        headers: Record<string, any>;
        params?: Record<string, any>;
        filters?: Record<string, any>;
    }): IResourceQueryOptions<T> & {
        queryParams: Record<string, any>;
    };
}