1import { daysToMonths, monthsToDays } from './bubble';
2import { normalizeUnits } from '../units/aliases';
3import toInt from '../utils/to-int';
4
5export function as(units) {
6    if (!this.isValid()) {
7        return NaN;
8    }
9    var days,
10        months,
11        milliseconds = this._milliseconds;
12
13    units = normalizeUnits(units);
14
15    if (units === 'month' || units === 'quarter' || units === 'year') {
16        days = this._days + milliseconds / 864e5;
17        months = this._months + daysToMonths(days);
18        switch (units) {
19            case 'month':
20                return months;
21            case 'quarter':
22                return months / 3;
23            case 'year':
24                return months / 12;
25        }
26    } else {
27        // handle milliseconds separately because of floating point math errors (issue #1867)
28        days = this._days + Math.round(monthsToDays(this._months));
29        switch (units) {
30            case 'week':
31                return days / 7 + milliseconds / 6048e5;
32            case 'day':
33                return days + milliseconds / 864e5;
34            case 'hour':
35                return days * 24 + milliseconds / 36e5;
36            case 'minute':
37                return days * 1440 + milliseconds / 6e4;
38            case 'second':
39                return days * 86400 + milliseconds / 1000;
40            // Math.floor prevents floating point math errors here
41            case 'millisecond':
42                return Math.floor(days * 864e5) + milliseconds;
43            default:
44                throw new Error('Unknown unit ' + units);
45        }
46    }
47}
48
49// TODO: Use this.as('ms')?
50export function valueOf() {
51    if (!this.isValid()) {
52        return NaN;
53    }
54    return (
55        this._milliseconds +
56        this._days * 864e5 +
57        (this._months % 12) * 2592e6 +
58        toInt(this._months / 12) * 31536e6
59    );
60}
61
62function makeAs(alias) {
63    return function () {
64        return this.as(alias);
65    };
66}
67
68var asMilliseconds = makeAs('ms'),
69    asSeconds = makeAs('s'),
70    asMinutes = makeAs('m'),
71    asHours = makeAs('h'),
72    asDays = makeAs('d'),
73    asWeeks = makeAs('w'),
74    asMonths = makeAs('M'),
75    asQuarters = makeAs('Q'),
76    asYears = makeAs('y');
77
78export {
79    asMilliseconds,
80    asSeconds,
81    asMinutes,
82    asHours,
83    asDays,
84    asWeeks,
85    asMonths,
86    asQuarters,
87    asYears,
88};