/** This file is part of natlib.
 * https://github.com/mvasilkov/natlib
 * @license MIT | Copyright (c) 2022, 2023, 2024 Mark Vasilkov
 */
'use strict'

import { UINT32_MAX, type uint32_t } from '../prelude.js'
import type { IPrng, IPrng32 } from './prng'

/** Mulberry32 PRNG class */
export class Mulberry32 implements IPrng32, IPrng {
    /*@__MANGLE_PROP__*/
    state: uint32_t

    constructor(seed: uint32_t) {
        this.state = seed | 0
    }

    /** Return a pseudorandom uint32. */
    randomUint32(): uint32_t {
        let z: uint32_t = this.state = (this.state + 0x6D2B79F5) | 0
        z = Math.imul(z ^ (z >>> 15), z | 1)
        z ^= z + Math.imul(z ^ (z >>> 7), z | 61)
        return (z ^ (z >>> 14)) >>> 0
    }

    /** Return a pseudorandom number in the range [0, 1). */
    random(): number {
        return this.randomUint32() / (UINT32_MAX + 1)
    }
}