1import absFloor from '../utils/abs-floor';
2import absCeil from '../utils/abs-ceil';
3
4export function bubble() {
5    var milliseconds = this._milliseconds,
6        days = this._days,
7        months = this._months,
8        data = this._data,
9        seconds,
10        minutes,
11        hours,
12        years,
13        monthsFromDays;
14
15    // if we have a mix of positive and negative values, bubble down first
16    // check: https://github.com/moment/moment/issues/2166
17    if (
18        !(
19            (milliseconds >= 0 && days >= 0 && months >= 0) ||
20            (milliseconds <= 0 && days <= 0 && months <= 0)
21        )
22    ) {
23        milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
24        days = 0;
25        months = 0;
26    }
27
28    // The following code bubbles up values, see the tests for
29    // examples of what that means.
30    data.milliseconds = milliseconds % 1000;
31
32    seconds = absFloor(milliseconds / 1000);
33    data.seconds = seconds % 60;
34
35    minutes = absFloor(seconds / 60);
36    data.minutes = minutes % 60;
37
38    hours = absFloor(minutes / 60);
39    data.hours = hours % 24;
40
41    days += absFloor(hours / 24);
42
43    // convert days to months
44    monthsFromDays = absFloor(daysToMonths(days));
45    months += monthsFromDays;
46    days -= absCeil(monthsToDays(monthsFromDays));
47
48    // 12 months -> 1 year
49    years = absFloor(months / 12);
50    months %= 12;
51
52    data.days = days;
53    data.months = months;
54    data.years = years;
55
56    return this;
57}
58
59export function daysToMonths(days) {
60    // 400 years have 146097 days (taking into account leap year rules)
61    // 400 years have 12 months === 4800
62    return (days * 4800) / 146097;
63}
64
65export function monthsToDays(months) {
66    // the reverse of daysToMonths
67    return (months * 146097) / 4800;
68}