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+import rng from './rng.js';
+import stringify from './stringify.js'; // **`v1()` - Generate time-based UUID**
+//
+// Inspired by https://github.com/LiosK/UUID.js
+// and http://docs.python.org/library/uuid.html
+
+var _nodeId;
+
+var _clockseq; // Previous uuid creation time
+
+
+var _lastMSecs = 0;
+var _lastNSecs = 0; // See https://github.com/uuidjs/uuid for API details
+
+function v1(options, buf, offset) {
+ var i = buf && offset || 0;
+ var b = buf || new Array(16);
+ options = options || {};
+ var node = options.node || _nodeId;
+ var clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq; // node and clockseq need to be initialized to random values if they're not
+ // specified. We do this lazily to minimize issues related to insufficient
+ // system entropy. See #189
+
+ if (node == null || clockseq == null) {
+ var seedBytes = options.random || (options.rng || rng)();
+
+ if (node == null) {
+ // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)
+ node = _nodeId = [seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5]];
+ }
+
+ if (clockseq == null) {
+ // Per 4.2.2, randomize (14 bit) clockseq
+ clockseq = _clockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff;
+ }
+ } // UUID timestamps are 100 nano-second units since the Gregorian epoch,
+ // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so
+ // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
+ // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
+
+
+ var msecs = options.msecs !== undefined ? options.msecs : Date.now(); // Per 4.2.1.2, use count of uuid's generated during the current clock
+ // cycle to simulate higher resolution clock
+
+ var nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1; // Time since last uuid creation (in msecs)
+
+ var dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000; // Per 4.2.1.2, Bump clockseq on clock regression
+
+ if (dt < 0 && options.clockseq === undefined) {
+ clockseq = clockseq + 1 & 0x3fff;
+ } // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new
+ // time interval
+
+
+ if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {
+ nsecs = 0;
+ } // Per 4.2.1.2 Throw error if too many uuids are requested
+
+
+ if (nsecs >= 10000) {
+ throw new Error("uuid.v1(): Can't create more than 10M uuids/sec");
+ }
+
+ _lastMSecs = msecs;
+ _lastNSecs = nsecs;
+ _clockseq = clockseq; // Per 4.1.4 - Convert from unix epoch to Gregorian epoch
+
+ msecs += 12219292800000; // `time_low`
+
+ var 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; // `time_mid`
+
+ var tmh = msecs / 0x100000000 * 10000 & 0xfffffff;
+ b[i++] = tmh >>> 8 & 0xff;
+ b[i++] = tmh & 0xff; // `time_high_and_version`
+
+ b[i++] = tmh >>> 24 & 0xf | 0x10; // include version
+
+ b[i++] = tmh >>> 16 & 0xff; // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
+
+ b[i++] = clockseq >>> 8 | 0x80; // `clock_seq_low`
+
+ b[i++] = clockseq & 0xff; // `node`
+
+ for (var n = 0; n < 6; ++n) {
+ b[i + n] = node[n];
+ }
+
+ return buf || stringify(b);
+}
+
+export default v1; \ No newline at end of file