import { get, set } from './get-set';
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import { setMonth } from '../units/month';
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import { createDuration } from '../duration/create';
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import { deprecateSimple } from '../utils/deprecate';
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import { hooks } from '../utils/hooks';
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import absRound from '../utils/abs-round';
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// TODO: remove 'name' arg after deprecation is removed
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function createAdder(direction, name) {
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return function (val, period) {
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var dur, tmp;
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//invert the arguments, but complain about it
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if (period !== null && !isNaN(+period)) {
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deprecateSimple(
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name,
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'moment().' +
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name +
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'(period, number) is deprecated. Please use moment().' +
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name +
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'(number, period). ' +
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'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.'
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);
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tmp = val;
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val = period;
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period = tmp;
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}
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dur = createDuration(val, period);
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addSubtract(this, dur, direction);
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return this;
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};
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}
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export function addSubtract(mom, duration, isAdding, updateOffset) {
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var milliseconds = duration._milliseconds,
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days = absRound(duration._days),
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months = absRound(duration._months);
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if (!mom.isValid()) {
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// No op
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return;
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}
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updateOffset = updateOffset == null ? true : updateOffset;
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if (months) {
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setMonth(mom, get(mom, 'Month') + months * isAdding);
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}
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if (days) {
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set(mom, 'Date', get(mom, 'Date') + days * isAdding);
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}
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if (milliseconds) {
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mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
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}
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if (updateOffset) {
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hooks.updateOffset(mom, days || months);
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}
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}
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export var add = createAdder(1, 'add'),
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subtract = createAdder(-1, 'subtract');
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