#nullable enable

namespace Demo2.Domain
{
    public struct DeterministicRandom
    {
        private ulong _state;
        private ulong _increment;

        public DeterministicRandom(ulong seed, ulong stream = 54)
        {
            _state = 0;
            _increment = (stream << 1) | 1;
            NextUInt();
            _state += seed;
            NextUInt();
        }

        public uint NextUInt()
        {
            var oldState = _state;
            _state = unchecked(oldState * 6364136223846793005UL + _increment);
            var xorShifted = (uint)(((oldState >> 18) ^ oldState) >> 27);
            var rotation = (int)(oldState >> 59);
            return (xorShifted >> rotation) | (xorShifted << ((-rotation) & 31));
        }

        public int NextInt(int minInclusive, int maxExclusive)
        {
            if (maxExclusive <= minInclusive) return minInclusive;
            return minInclusive + (int)(NextUInt() % (uint)(maxExclusive - minInclusive));
        }
    }
}