import { NetgrifApplicationEngine, Services, View } from '../../commons/schema';
import { Observable } from 'rxjs';
import { ApplicationConfiguration } from './application-configuration';
import { ConfigurationResourceService } from '../resources/engine-endpoint/configuration-resource.service';
export declare abstract class ConfigurationService {
    protected configuration: NetgrifApplicationEngine;
    protected _configurationResource: ConfigurationResourceService;
    protected _applicationConfiguration: ApplicationConfiguration;
    private _dataFieldConfiguration;
    private readonly APPLICATION_CONFIG;
    private readonly _config$;
    readonly config$: Observable<NetgrifApplicationEngine | null>;
    readonly loaded$: Observable<boolean>;
    protected constructor(configuration: NetgrifApplicationEngine, _configurationResource: ConfigurationResourceService, _applicationConfiguration: ApplicationConfiguration);
    get snapshot(): NetgrifApplicationEngine | null;
    private initialize;
    getAsync(): Observable<NetgrifApplicationEngine>;
    /**
     * Calls to this method should be avoided as creating a deep copy of the configuration has a large overhead
     *
     * @returns a deep copy of the entire configuration object
     */
    get(): NetgrifApplicationEngine;
    /**
     * Get view configuration from nae.json for view at given config path.
     * @param viewConfigPath configuration path to the requested view. No leading backslash.
     * @return requested configuration if it exists. `undefined` otherwise.
     */
    getViewByPath(viewConfigPath: string): View | undefined;
    /**
     * Get view configuration from nae.json for view at given url.
     * @param url to the requested view. Necessary backslash.
     * @return requested configuration if it exists. `undefined` otherwise.
     */
    getViewByUrl(url: string): View | undefined;
    private getChildren;
    /**
     * Get all URLs/paths of views with specified layout.
     * @param layout Search views with this layout
     * @returns Paths with prefixed '/' of all views with specified layout, empty array otherwise.
     */
    getPathsByView(layout: string): Array<string>;
    getConfigurationSubtreeByPath(path: string): any | undefined;
    /**
     * @param pathSegments the keys specifying the path trough the configuration that should be accessed
     * @returns a deep copy of a specified subsection of the configuration object, or `undefined` if such subsection doesn't exist.
     * Calling this method with an empty array as argument is equivalent to calling the [get()]{@link ConfigurationService#get} method.
     */
    getConfigurationSubtree(pathSegments: Array<string>): any | undefined;
    /**
     * @returns the appropriate template configuration for data fields, or `undefined` if such configuration is not present.
     */
    getDatafieldConfiguration(): Services['dataFields'] | undefined;
    /**
     * Resolves the URL addresses of backend endpoints based on the provided configuration.
     *
     * If the URLs begin with either `http://`, or `https://` the provided URL will be used.
     *
     * If not, then the URLs are considered to be relative to the location of the frontend application and it's URL will be used
     * as the base path. `/api` is appended automatically.
     */
    protected resolveEndpointURLs(): void;
    /**
     * Resolves a single URL address.
     *
     * If the URL begins with either `http://`, or `https://` the provided URL will be used.
     *
     * If not, then the URL is considered to be relative to the location of the frontend application and it's URL will be used
     * as the base path. `/api` is appended automatically.
     *
     * @param configURL value from the configuration file
     * @returns the resolved URL
     */
    protected resolveURL(configURL: string): string;
    /**
     * @returns the services configuration, or `undefined` if such configuration is not present.
     */
    getServicesConfiguration(): Services | undefined;
    /**
     * @returns the value stored in the [onLogoutRedirect]{@link Services#auth.onLogoutRedirect} attribute if defined.
     * If not and the deprecated attribute [logoutRedirect]{@link Services#auth.logoutRedirect} is defined then its value is returned.
     * Otherwise, `undefined` is returned.
     */
    getOnLogoutPath(): string | undefined;
    /**
     * @returns the value stored in the [toLoginRedirect]{@link Services#auth.toLoginRedirect} attribute if defined.
     * If not and the deprecated attribute [loginRedirect]{@link Services#auth.loginRedirect} is defined then its value is returned.
     * Otherwise, `undefined` is returned.
     */
    getToLoginPath(): string | undefined;
    /**
     * @returns the value stored in the [onLoginRedirect]{@link Services#auth.onLoginRedirect} attribute if defined.
     * Otherwise, `undefined` is returned.
     */
    getOnLoginPath(): string | undefined;
    private getView;
    /**
     * @param endpointKey the attribute name of the endpoint address in `nae.json`
     * @returns the endpoint address or `undefined` if such endpoint is not defined in `nae.json`
     */
    resolveProvidersEndpoint(endpointKey: string): string;
    /**
     * Loads and initializes application configuration from the backend.
     * If configuration resolution is disabled in APPLICATION_CONFIG, returns null Observable.
     * Otherwise fetches public configuration via ConfigurationResourceService.
     *
     * @returns Observable<any> that emits null if resolution is disabled, otherwise emits the loaded configuration
     * @fires initialize() Upon successful configuration load to setup endpoints and data field configurations
     * @see ApplicationConfiguration
     * @see NetgrifApplicationEngine
     */
    loadConfiguration(): Observable<void>;
    private createConfigurationCopy;
    private getViewsCopy;
    private deepCopy;
}