# Copyright (C) 2022-2025 Exaloop Inc. <https://exaloop.io>

class Splitmix64:
    state: u64

    def __init__(self, state: u64):
        self.state = state

    def __init__(self, state: int = 0):
        self.state = u64(state)

    def __get_state__(self):
        return (self.state,)

    def __set_state__(self, state):
        self.state = state[0]

    def next64(self):
        c0 = (u64(0x9e3779b9) << u64(32)) | u64(0x7f4a7c15)
        c1 = (u64(0xbf58476d) << u64(32)) | u64(0x1ce4e5b9)
        c2 = (u64(0x94d049bb) << u64(32)) | u64(0x133111eb)
        self.state += c0
        z = self.state
        z = (z ^ (z >> u64(30))) * c1
        z = (z ^ (z >> u64(27))) * c2
        return z ^ (z >> u64(31))