/**
 * @module ember-osf
 * @submodule utils
 */

/**
 * @class human-file-size
 */

/**
 * Borrowed from osf code, transforms received number of bytes size into human-
 * readable sizing.
 *
 * @method humanFileSize
 * @param {Number|String} bytes Number of bytes
 * @param {Boolean} bool Whether to use 1000 as the base for conversion or 1024
 * @return {String}
 */
export default function humanFileSize(bytes, si) {
//Borrowed from osfHelpers:
//https://github.com/CenterForOpenScience/osf.io/blob/develop/website/static/js/osfHelpers.js#L645
    var thresh = si ? 1000 : 1024;
    if(Math.abs(bytes) < thresh) {
        return bytes + ' B';
    }
    var units = si ?
        ['kB','MB','GB','TB','PB','EB','ZB','YB'] :
        ['KiB','MiB','GiB','TiB','PiB','EiB','ZiB','YiB'];
    var u = -1;
    do {
        bytes /= thresh;
        ++u;
    } while(Math.abs(bytes) >= thresh && u < units.length - 1);
    return bytes.toFixed(1) + ' ' + units[u];
}