import { DateKey } from "../Time";
import { Index } from "../Types";
import { Database } from "../process/Types";
/**
 * Keeps the state of the currently applied filters in the UI.
 * Stores the selected time range and the index of the selected channels & authors.
 *
 * Can be updated and queried.
 */
export declare class Filters {
    private channels;
    private authors;
    private startDayIndex;
    private endDayIndex;
    private dateKeys;
    constructor(database: Database);
    /** Updates the indexes of the selected channels */
    updateChannels(channels: Index[]): void;
    /** Updates the indexes of the selected authors */
    updateAuthors(authors: Index[]): void;
    /** Updates the start date of the selected time range */
    updateStartDate(startDate: DateKey): void;
    /** Updates the end date of the selected time range */
    updateEndDate(endDate: DateKey): void;
    /** @returns true if the channel is currently selected */
    hasChannel(channelIndex: number): boolean;
    /** @returns true if the author is currently selected */
    hasAuthor(authorIndex: number): boolean;
    /** @returns true if the day is inside the selected time range */
    inTime(dayIndex: number): boolean;
    /** @returns the number of days that are currently selected */
    get numActiveDays(): number;
}