import { normalizeUnits } from '../units/aliases';
export function startOf (units) {
units = normalizeUnits(units);
// the following switch intentionally omits break keywords
// to utilize falling through the cases.
switch (units) {
case 'year':
this.month(0);
/* falls through */
case 'quarter':
case 'month':
this.date(1);
/* falls through */
case 'week':
case 'isoWeek':
case 'day':
case 'date':
this.hours(0);
/* falls through */
case 'hour':
this.minutes(0);
/* falls through */
case 'minute':
this.seconds(0);
/* falls through */
case 'second':
this.milliseconds(0);
}
// weeks are a special case
if (units === 'week') {
this.weekday(0);
}
if (units === 'isoWeek') {
this.isoWeekday(1);
}
// quarters are also special
if (units === 'quarter') {
this.month(Math.floor(this.month() / 3) * 3);
}
return this;
}
export function endOf (units) {
units = normalizeUnits(units);
if (units === undefined || units === 'millisecond') {
return this;
}
// 'date' is an alias for 'day', so it should be considered as such.
if (units === 'date') {
units = 'day';
}
return this.startOf(units).add(1, (units === 'isoWeek' ? 'week' : units)).subtract(1, 'ms');
}
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