import { WritableSignal } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';
import { BaseModel, QueryParams } from 'verben-workflow-ui/src/lib/models';
import { CardData, ColumnDefinition, FilterCondition, SortCondition } from 'verben-ng-ui';
/**
 * Abstract state management for base data pages.
 * Tracks items, loading state, query params, filters, sorts, search, and
 * visible columns. Card data is held in signals for cheap change detection.
 */
export declare abstract class BaseDataPageState<T extends BaseModel> {
    protected updating$: BehaviorSubject<boolean>;
    protected items$: BehaviorSubject<T[]>;
    protected totalCount$: BehaviorSubject<number>;
    protected queryParams$: BehaviorSubject<QueryParams<T>>;
    protected searchTerm$: BehaviorSubject<string>;
    protected filters$: BehaviorSubject<FilterCondition[]>;
    protected sorts$: BehaviorSubject<SortCondition[]>;
    protected visibleColumns$: BehaviorSubject<ColumnDefinition<T>[]>;
    protected isTableView$: BehaviorSubject<boolean>;
    protected cardData: WritableSignal<CardData[]>;
    protected currentCardData: WritableSignal<CardData | null>;
    protected cardDataMapper?: (item: T) => CardData;
    /**
     * Stable identity for a record. `Code` comes first: it is what every page in
     * this library matches on, and what the backend assigns on persist. `Id` is
     * frequently the empty string on records that came back from a save, and the
     * lowercase `id` is a client-generated UUID that exists only on unsaved rows.
     */
    protected getItemKey(item: T): string;
    protected updateCardDataFromItems(items: T[]): void;
    isUpdating$(): Observable<boolean>;
    setUpdating(isUpdating: boolean): void;
    getItems$(): Observable<T[]>;
    getItemsValue(): T[];
    setItems(items: T[]): void;
    appendItems(newItems: T[]): void;
    addItem(item: T): void;
    updateItem(updatedItem: T): void;
    /** Update the item when its key already exists, otherwise prepend it. */
    upsertItem(item: T): void;
    removeItem(itemKey: string): void;
    clearItems(): void;
    getTotalCount$(): Observable<number>;
    setTotalCount(count: number): void;
    getQueryParams$(): Observable<QueryParams<T>>;
    getQueryParamsValue(): QueryParams<T>;
    updateQueryParams(params: Partial<QueryParams<T>>): void;
    resetPagination(): void;
    incrementPagination(): void;
    getSearchTerm$(): Observable<string>;
    getSearchTermValue(): string;
    setSearchTerm(term: string): void;
    getFilters$(): Observable<FilterCondition[]>;
    getFiltersValue(): FilterCondition[];
    setFilters(filters: FilterCondition[]): void;
    clearFilters(): void;
    getSorts$(): Observable<SortCondition[]>;
    getSortsValue(): SortCondition[];
    setSorts(sorts: SortCondition[]): void;
    clearSorts(): void;
    getVisibleColumns$(): Observable<ColumnDefinition<T>[]>;
    getVisibleColumnsValue(): ColumnDefinition<T>[];
    setVisibleColumns(columns: ColumnDefinition<T>[]): void;
    getIsTableView$(): Observable<boolean>;
    getIsTableViewValue(): boolean;
    setIsTableView(isTableView: boolean): void;
    setCardDataMapper(mapper: (item: T) => CardData): void;
    getCardData(): WritableSignal<CardData[]>;
    setCardData(data: CardData[]): void;
    getCurrentCardData(): WritableSignal<CardData | null>;
    setCurrentCardData(data: CardData | null): void;
    reset(): void;
}