import { getDayOfWeek, isFirstDayOfWeek } from '../../bs-moment/utils/date-getters';
import { shiftDate } from '../../bs-moment/utils/date-setters';
import { isSameOrAfter, isSameOrBefore } from '../../bs-moment/utils/date-compare';
import { endOf, startOf } from '../../bs-moment/utils/start-end-of';

export function getStartingDayOfCalendar(date: Date, options: {firstDayOfWeek?: number}): Date {
  if (isFirstDayOfWeek(date, options.firstDayOfWeek)) {
    return date;
  }

  const weekDay = getDayOfWeek(date);

  return shiftDate(date, {day: -weekDay});
}

export function isMonthDisabled(date: Date, min: Date, max: Date): boolean {
  const minBound = min && isSameOrBefore(endOf(date, 'month'), min, 'day');
  const maxBound = max && isSameOrAfter(startOf(date, 'month'), max, 'day');

  return minBound || maxBound;
}

export function isYearDisabled(date: Date, min: Date, max: Date): boolean {
  const minBound = min && isSameOrBefore(endOf(date, 'year'), min, 'day');
  const maxBound = max && isSameOrAfter(startOf(date, 'year'), max, 'day');

  return minBound || maxBound;
}