import absFloor from '../utils/abs-floor';

import absCeil from '../utils/abs-ceil';

import { createUTCDate } from '../create/date-from-array';



export function bubble () {

    var milliseconds = this._milliseconds;

    var days         = this._days;

    var months       = this._months;

    var data         = this._data;

    var seconds, minutes, hours, years, monthsFromDays;



    // if we have a mix of positive and negative values, bubble down first

    // check: https://github.com/moment/moment/issues/2166

    if (!((milliseconds >= 0 && days >= 0 && months >= 0) ||

            (milliseconds <= 0 && days <= 0 && months <= 0))) {

        milliseconds += absCeil(monthsToDays(months) + days) * 864e5;

        days = 0;

        months = 0;

    }



    // The following code bubbles up values, see the tests for

    // examples of what that means.

    data.milliseconds = milliseconds % 1000;



    seconds           = absFloor(milliseconds / 1000);

    data.seconds      = seconds % 60;



    minutes           = absFloor(seconds / 60);

    data.minutes      = minutes % 60;



    hours             = absFloor(minutes / 60);

    data.hours        = hours % 24;



    days += absFloor(hours / 24);



    // convert days to months

    monthsFromDays = absFloor(daysToMonths(days));

    months += monthsFromDays;

    days -= absCeil(monthsToDays(monthsFromDays));



    // 12 months -> 1 year

    years = absFloor(months / 12);

    months %= 12;



    data.days   = days;

    data.months = months;

    data.years  = years;



    return this;

}



export function daysToMonths (days) {

    // 400 years have 146097 days (taking into account leap year rules)

    // 400 years have 12 months === 4800

    return days * 4800 / 146097;

}



export function monthsToDays (months) {

    // the reverse of daysToMonths

    return months * 146097 / 4800;

}

