import { DataSource } from '@angular/cdk/collections';
import { Observable } from 'rxjs';

interface SimpleDataSource<T> extends DataSource<T> {
    connect(): Observable<T[]>;
    disconnect(): void;
}

interface Sort<T> {
    property: keyof T;
    order: 'asc' | 'desc';
}
interface PageRequest<T> {
    page: number;
    size: number;
    sort?: Sort<T>;
}
interface Page<T> {
    content: T[];
    totalElements: number;
    size: number;
    number: number;
}
type PaginationEndpoint<T, Q> = (pageable: PageRequest<T>, query: Q) => Observable<Page<T>>;

type UpdateFn<T> = (last: T) => T;
declare class PaginationDataSource<T, Q = Partial<T>> implements SimpleDataSource<T> {
    private endpoint;
    pageSize: number;
    initialPage: number;
    loading$: Observable<boolean>;
    page$: Observable<Page<T>>;
    private readonly pageNumber;
    private readonly sort;
    private readonly query;
    private readonly loading;
    constructor(endpoint: PaginationEndpoint<T, Q>, initialSort: Sort<T>, initialQuery: Q, pageSize?: number, initialPage?: number);
    sortBy(sortUpdate: Partial<Sort<T>> | UpdateFn<Sort<T>>): void;
    queryBy(queryUpdate: Partial<Q> | UpdateFn<Q>): void;
    fetch(page: number, pageSize?: number): void;
    connect(): Observable<T[]>;
    disconnect(): void;
}

export { PaginationDataSource };
export type { Page, PageRequest, PaginationEndpoint, SimpleDataSource, Sort, UpdateFn };