DMleadgen
46d973904b
Next.js website for Rocky Mountain Vending company featuring: - Product catalog with Stripe integration - Service areas and parts pages - Admin dashboard with Clerk authentication - SEO optimized pages with JSON-LD structured data Co-authored-by: Cursor <cursoragent@cursor.com>
48 lines
1.6 KiB
Text
48 lines
1.6 KiB
Text
import type { DateLib } from "../classes/DateLib.js";
|
|
import type { DayPickerProps } from "../types/index.js";
|
|
|
|
/**
|
|
* Returns the previous month the user can navigate to, based on the given
|
|
* options.
|
|
*
|
|
* The previous month is not always the previous calendar month:
|
|
*
|
|
* - If it is before the `calendarStartMonth`, it returns `undefined`.
|
|
* - If paged navigation is enabled, it skips back by the number of displayed
|
|
* months.
|
|
*
|
|
* @param firstDisplayedMonth The first month currently displayed in the
|
|
* calendar.
|
|
* @param calendarStartMonth The earliest month the user can navigate to.
|
|
* @param options Navigation options, including `numberOfMonths` and
|
|
* `pagedNavigation`.
|
|
* @param dateLib The date library to use for date manipulation.
|
|
* @returns The previous month, or `undefined` if navigation is not possible.
|
|
*/
|
|
export function getPreviousMonth(
|
|
firstDisplayedMonth: Date,
|
|
calendarStartMonth: Date | undefined,
|
|
options: Pick<
|
|
DayPickerProps,
|
|
"numberOfMonths" | "pagedNavigation" | "disableNavigation"
|
|
>,
|
|
dateLib: DateLib
|
|
): Date | undefined {
|
|
if (options.disableNavigation) {
|
|
return undefined;
|
|
}
|
|
const { pagedNavigation, numberOfMonths } = options;
|
|
const { startOfMonth, addMonths, differenceInCalendarMonths } = dateLib;
|
|
const offset = pagedNavigation ? (numberOfMonths ?? 1) : 1;
|
|
const month = startOfMonth(firstDisplayedMonth);
|
|
if (!calendarStartMonth) {
|
|
return addMonths(month, -offset);
|
|
}
|
|
const monthsDiff = differenceInCalendarMonths(month, calendarStartMonth);
|
|
|
|
if (monthsDiff <= 0) {
|
|
return undefined;
|
|
}
|
|
|
|
return addMonths(month, -offset);
|
|
}
|