/**
 * Returns the next month the user can navigate to, based on the given options.
 *
 * The next month is not always the next calendar month:
 *
 * - If it is after the `calendarEndMonth`, it returns `undefined`.
 * - If paged navigation is enabled, it skips forward by the number of displayed
 *   months.
 *
 * @param firstDisplayedMonth The first month currently displayed in the
 *   calendar.
 * @param calendarEndMonth The latest 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 next month, or `undefined` if navigation is not possible.
 */
function getNextMonth(firstDisplayedMonth, calendarEndMonth, options, dateLib) {
    if (options.disableNavigation) {
        return undefined;
    }
    const { pagedNavigation, numberOfMonths = 1 } = options;
    const { startOfMonth, addMonths, differenceInCalendarMonths } = dateLib;
    const offset = pagedNavigation ? numberOfMonths : 1;
    const month = startOfMonth(firstDisplayedMonth);
    if (!calendarEndMonth) {
        return addMonths(month, offset);
    }
    const monthsDiff = differenceInCalendarMonths(calendarEndMonth, firstDisplayedMonth);
    if (monthsDiff < numberOfMonths) {
        return undefined;
    }
    return addMonths(month, offset);
}

export { getNextMonth };
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