import isEqual from './equals';

export default function getModifiedData(object, objectOld) {
    var newObject = {};
    if (objectOld === null)
        return object;

    for (var k in object) {
        var val = object[k];
        var valOld = objectOld[k] === undefined ? null : objectOld[k];

        if (!isEqual(val, valOld)) {
            if (val instanceof Date) {
                newObject[k] = new Date(val.getTime());
            } else if (val instanceof Object) {
                newObject[k] = getModifiedData(val, valOld);
            } else {
                newObject[k] = val;
            }
        }
    }

    return Object.keys(newObject).length ? newObject : undefined;
}