import { TZDate } from '@date-fns/tz';
import type { RefObject } from 'react';
import type { CalendarType } from './calendarConfiguration.js';
/** @internal */
export type CalendarViewType = 'day' | 'month' | 'year';
/** @internal */
export interface UseCalendarItemProps {
    date: TZDate;
    itemRef: RefObject<HTMLDivElement | null> | undefined;
}
/**
 * Index of the first day of the week, used by date-fns. 0 is for Sunday.
 * @internal
 */
export type FirstDayOfWeek = 0 | 1 | 2 | 3 | 4 | 5 | 6;
/** @internal */
export interface CalendarState {
    /** The current date when mounting the calendar. */
    today: TZDate;
    /** The date, defining what days/months/years are currently shown in the calendar. */
    activeDate: TZDate;
    /** The currently open view. */
    currentView: CalendarViewType;
    /**
     * Indicates if a keydown event originated from within the calendar.
     * Used to control focus updates and prevent unwanted focus changes.
     */
    shouldUpdateFocusFromKeydown: boolean | null;
    /** The type of calendar (single or range). */
    type: CalendarType;
    /** How the next selection should update the selected date. It is undefined for single calendars. */
    position?: 'from' | 'to';
}
/** @internal */
export type CalendarNavigationPayload = {
    /**
     * The amount defines by how many items the view should be shifted. The sign defines whether the value is subtracted or added to the current view.
     * For example, in the month view of January a +1 would show February and a -1 December of the year before.
     */
    amount: number | 'endOfWeek' | 'startOfWeek';
    /** Some navigation shortcuts don't navigate within the view but affect the whole view, e.g. in the day view navigating to the next month with PageUp.  */
    unit?: CalendarViewType;
};
/** @internal */
export type CalendarReducerAction = {
    type: 'activeDateChange';
    payload: {
        activeDate: TZDate;
        changeToView?: CalendarViewType;
    };
} | {
    type: 'shouldUpdateFocusFromKeydown';
    payload: boolean;
} | {
    type: 'currentViewChange';
    payload: CalendarViewType;
} | {
    type: 'navigateCurrentView';
    payload: CalendarNavigationPayload;
};