// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { bytesToUuid } from "./_common.ts";
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-1[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
/**
 * Validates the UUID v1.
 * @param id UUID value.
 */ export function validate(id) {
    return UUID_RE.test(id);
}
let _nodeId;
let _clockseq;
let _lastMSecs = 0;
let _lastNSecs = 0;
/**
 * Generates a RFC4122 v1 UUID (time-based).
 * @param options Can use RFC time sequence values as overwrites.
 * @param buf Can allow the UUID to be written in byte-form starting at the offset.
 * @param offset Index to start writing on the UUID bytes in buffer.
 */ export function generate(options, buf, offset) {
    let i = buf && offset || 0;
    const b = buf ?? [];
    options ??= {};
    let { node =_nodeId , clockseq =_clockseq  } = options;
    if (node === undefined || clockseq === undefined) {
        // deno-lint-ignore no-explicit-any
        const seedBytes = options.random ?? options.rng ?? crypto.getRandomValues(new Uint8Array(16));
        if (node === undefined) {
            node = _nodeId = [
                seedBytes[0] | 0x01,
                seedBytes[1],
                seedBytes[2],
                seedBytes[3],
                seedBytes[4],
                seedBytes[5]
            ];
        }
        if (clockseq === undefined) {
            clockseq = _clockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff;
        }
    }
    let { msecs =new Date().getTime() , nsecs =_lastNSecs + 1  } = options;
    const dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000;
    if (dt < 0 && options.clockseq === undefined) {
        clockseq = clockseq + 1 & 0x3fff;
    }
    if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {
        nsecs = 0;
    }
    if (nsecs > 10000) {
        throw new Error("Can't create more than 10M uuids/sec");
    }
    _lastMSecs = msecs;
    _lastNSecs = nsecs;
    _clockseq = clockseq;
    msecs += 12219292800000;
    const tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
    b[i++] = tl >>> 24 & 0xff;
    b[i++] = tl >>> 16 & 0xff;
    b[i++] = tl >>> 8 & 0xff;
    b[i++] = tl & 0xff;
    const tmh = msecs / 0x100000000 * 10000 & 0xfffffff;
    b[i++] = tmh >>> 8 & 0xff;
    b[i++] = tmh & 0xff;
    b[i++] = tmh >>> 24 & 0xf | 0x10;
    b[i++] = tmh >>> 16 & 0xff;
    b[i++] = clockseq >>> 8 | 0x80;
    b[i++] = clockseq & 0xff;
    for(let n = 0; n < 6; ++n){
        b[i + n] = node[n];
    }
    return buf ?? bytesToUuid(b);
}
//# sourceMappingURL=data:application/json;base64,[encoded data, 6392 characters]