// Copyright 2018-2024 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}$/i;
/**
 * Validates the UUID v1.
 *
 * @example
 * ```ts
 * import { validate } from "https://deno.land/std@$STD_VERSION/uuid/v1.ts";
 *
 * validate("ea71fc60-a713-11ee-af61-8349da24f689");  // true
 * validate("fac8c1e0-ad1a-4204-a0d0-8126ae84495d");  // false
 * ```
 *
 * @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).
 *
 * @example
 * ```ts
 * import { generate } from "https://deno.land/std@$STD_VERSION/uuid/v1.ts";
 *
 * const options = {
 *   node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
 *   clockseq: 0x1234,
 *   msecs: new Date("2011-11-01").getTime(),
 *   nsecs: 5678,
 * };
 *
 * generate(options); // "710b962e-041c-11e1-9234-0123456789ab"
 * ```
 *
 * @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;
  // We have to add this value because "msecs" here is the number of
  // milliseconds since January 1, 1970, not since October 15, 1582.
  // This is also the milliseconds from October 15, 1582 to January 1, 1970.
  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);
}
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