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