import hasOwnProp from ‘../utils/has-own-prop’;

var aliases = {};

export function addUnitAlias (unit, shorthand) {

var lowerCase = unit.toLowerCase();
aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;

}

export function normalizeUnits(units) {

return typeof units === 'string' ? aliases[units] || aliases[units.toLowerCase()] : undefined;

}

export function normalizeObjectUnits(inputObject) {

var normalizedInput = {},
    normalizedProp,
    prop;

for (prop in inputObject) {
    if (hasOwnProp(inputObject, prop)) {
        normalizedProp = normalizeUnits(prop);
        if (normalizedProp) {
            normalizedInput[normalizedProp] = inputObject[prop];
        }
    }
}

return normalizedInput;

}