/**
 * Copyright (c) 2017 mol* contributors, licensed under MIT, See LICENSE file for more info.
 *
 * @author David Sehnal <david.sehnal@gmail.com>
 */

import { now } from 'mol-task'

type UUID = string & { '@type': 'uuid' }

namespace UUID {
    export function create(): UUID {
        let d = (+new Date()) + now();
        const uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
            const r = (d + Math.random()*16)%16 | 0;
            d = Math.floor(d/16);
            return (c==='x' ? r : (r&0x3|0x8)).toString(16);
        });
        return uuid as any;
    }
}

export default UUID;