1import { get, set } from './get-set';
2import { setMonth } from '../units/month';
3import { createDuration } from '../duration/create';
4import { deprecateSimple } from '../utils/deprecate';
5import { hooks } from '../utils/hooks';
6import absRound from '../utils/abs-round';
7
8// TODO: remove 'name' arg after deprecation is removed
9function createAdder(direction, name) {
10    return function (val, period) {
11        var dur, tmp;
12        //invert the arguments, but complain about it
13        if (period !== null && !isNaN(+period)) {
14            deprecateSimple(
15                name,
16                'moment().' +
17                    name +
18                    '(period, number) is deprecated. Please use moment().' +
19                    name +
20                    '(number, period). ' +
21                    'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.'
22            );
23            tmp = val;
24            val = period;
25            period = tmp;
26        }
27
28        dur = createDuration(val, period);
29        addSubtract(this, dur, direction);
30        return this;
31    };
32}
33
34export function addSubtract(mom, duration, isAdding, updateOffset) {
35    var milliseconds = duration._milliseconds,
36        days = absRound(duration._days),
37        months = absRound(duration._months);
38
39    if (!mom.isValid()) {
40        // No op
41        return;
42    }
43
44    updateOffset = updateOffset == null ? true : updateOffset;
45
46    if (months) {
47        setMonth(mom, get(mom, 'Month') + months * isAdding);
48    }
49    if (days) {
50        set(mom, 'Date', get(mom, 'Date') + days * isAdding);
51    }
52    if (milliseconds) {
53        mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
54    }
55    if (updateOffset) {
56        hooks.updateOffset(mom, days || months);
57    }
58}
59
60export var add = createAdder(1, 'add'),
61    subtract = createAdder(-1, 'subtract');