/**
 * This file is part of the @egodigital/egoose distribution.
 * Copyright (c) e.GO Digital GmbH, Aachen, Germany (https://www.e-go-digital.com/)
 *
 * @egodigital/egoose is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, version 3.
 *
 * @egodigital/egoose is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
import { StatisticProvider, StatisticResultRow } from '../statistics/index';
import * as express from 'express';
/**
 * Options for 'registerStatisticsEndpoint()' function.
 */
export interface RegisterStatisticsEndpointOptions {
    /**
     * A custom function that is invoked AFTER a request.
     *
     * @param {any} err The error (if occurred).
     * @param {StatisticApiContext} context The context.
     */
    afterRequest?: (err: any, context: StatisticApiContext) => any;
    /**
     * A function that checks if a request is authorized to access the endpoint or not.
     *
     * @param {StatisticApiContext} context The context.
     *
     * @return {boolean|PromiseLike<boolean>} The result that indicates if request is authorized or not.
     */
    authorizer?: (context: StatisticApiContext) => boolean | PromiseLike<boolean>;
    /**
     * A custom function that is invoked BEFORE a request is handled.
     *
     * @param {StatisticApiContext} context The context.
     */
    beforeRequest?: (context: StatisticApiContext) => any;
    /**
     * A function that detects a statistic provider by name.
     */
    providerDetector: StatisticProviderDetector;
    /**
     * The custom name of API root.
     */
    rootName?: string;
    /**
     * A custom response handler.
     *
     * @param {StatisticProviderApiResult} result The result to handle.
     * @param {StatisticApiContext} context The context.
     *
     * @return {express.Response|PromiseLike<express.Response>} The (new) response context.
     */
    responseHandler?: (result: StatisticProviderApiResult, context: StatisticApiContext) => express.Response | PromiseLike<express.Response>;
}
/**
 * An statistic API request context.
 */
export interface StatisticApiContext {
    /**
     * The HTTP request context.
     */
    readonly request: express.Request;
    /**
     * The HTTP response context.
     */
    readonly response: express.Response;
    /**
     * Gets or sets a value for the whole execution chain.
     */
    value?: any;
}
/**
 * A result of statistic end point call.
 */
export interface StatisticProviderApiResult {
    /**
     * Indicates if there are more rows or not.
     */
    hasMore: boolean;
    /**
     * The zero based offset.
     */
    offset: number;
    /**
     * The list of rows.
     */
    rows: StatisticResultRow[];
    /**
     * The total number of rows.
     */
    totalCount: number;
}
/**
 * A function that detects a statistic provider by name.
 *
 * @param {string} name The name of the provider, in lower case letters.
 * @param {StatisticApiContext} context The context.
 *
 * @return {StatisticProviderDetectorResult|PromiseLike<StatisticProviderDetectorResult>} The result.
 */
export declare type StatisticProviderDetector = (name: string, context: StatisticApiContext) => StatisticProviderDetectorResult | PromiseLike<StatisticProviderDetectorResult>;
/**
 * The result of a statistic provider detection function.
 */
export declare type StatisticProviderDetectorResult = StatisticProvider | false;
/**
 * Registers an API endpoint for providing statistics.
 *
 * @param {express.Express | express.Router} hostOrRouter The host or router.
 * @param {RegisterStatisticsEndpointOptions} opts The options for the registration.
 */
export declare function registerStatisticsEndpoint(hostOrRouter: express.Express | express.Router, opts: RegisterStatisticsEndpointOptions): void;