import { OnDestroy } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';
import { Case } from '../../resources/interface/case';
import { NextGroupService } from './next-group.service';
import * as i0 from "@angular/core";
/**
 * This service to the groups that are "active" for the logged user.
 *
 * The meaning of "active" can wary from application to application. And this service provides the utility to track this state.
 *
 * The active groups are assumed to be a subset of the groups the logged user is a member of,
 * but this assumption is not enforced nor checked.
 *
 * If at most one group can be active at a time, this service provides utility methods to access this group directly.
 *
 * The groups are assumed to be instances of the engine group process, this is never checked nor enforced.
 *
 * In the default implementation the initially active groups are all the groups the logged user is a member of.
 */
export declare class ActiveGroupService implements OnDestroy {
    protected _groupService: NextGroupService;
    protected _activeGroups$: BehaviorSubject<Array<Case>>;
    private _groupSub;
    constructor(_groupService: NextGroupService);
    ngOnDestroy(): void;
    /**
     * In the default implementation this stream copies the values of the [memberGroups$]{@link NextGroupService#memberGroups$} stream
     * of the {@link NextGroupService}. Whenever the copies stream emits, the underlying stream in this class emits the same value.
     *
     * @returns an Observable of all the groups that are currently active
     */
    get activeGroups$(): Observable<Array<Case>>;
    get activeGroups(): Array<Case>;
    set activeGroups(activeGroups: Array<Case>);
    /**
     * @returns an Observable containing the first element of the [activeGroups$]{@link ActiveGroupService#activeGroups$} observable,
     * or `undefined` if the contained array is empty
     */
    get activeGroup$(): Observable<Case | undefined>;
    /**
     * @returns the first element of the [activeGroups]{@link ActiveGroupService#activeGroups} array, or `undefined` if the array is empty
     */
    get activeGroup(): Case | undefined;
    /**
     * Emits a new array into the [activeGroups$]{@link ActiveGroupService#activeGroups$} observable, that contains only
     * the provided {@link Case} object. If `undefined` is passed as argument, an empty array will be pushed into the observable.
     * @param activeGroup the new active group case reference
     */
    set activeGroup(activeGroup: Case);
    static ɵfac: i0.ɵɵFactoryDeclaration<ActiveGroupService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ActiveGroupService>;
}