using System;
using System.Threading;

namespace SharpChat {
    public static class SharpId {
        private const long EPOCH = 1588377600000;
        private static int Counter = 0;

        public static long Next() {
            long num = DateTimeOffset.Now.ToUnixTimeMilliseconds() - EPOCH;
            num <<= 8;
            num |= (ushort)(Interlocked.Increment(ref Counter) & 0xFFFF);
            return num;
        }
    }
}