import toInt from '../utils/to-int';

import indexOf from '../utils/index-of';

import {Duration} from './constructor';

import {createDuration} from './create';



var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];



export default function isDurationValid(m) {

    for (var key in m) {

        if (!(indexOf.call(ordering, key) !== -1 && (m[key] == null || !isNaN(m[key])))) {

            return false;

        }

    }



    var unitHasDecimal = false;

    for (var i = 0; i < ordering.length; ++i) {

        if (m[ordering[i]]) {

            if (unitHasDecimal) {

                return false; // only allow non-integers for smallest unit

            }

            if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {

                unitHasDecimal = true;

            }

        }

    }



    return true;

}



export function isValid() {

    return this._isValid;

}



export function createInvalid() {

    return createDuration(NaN);

}

