//
//  lehmer.cpp
//  rng
//
//  Created by Asher Falcon on 20/06/2025.
//

#include "../../rng.h"
#include "../generator.h"

// parameters recommended by Nakazawa & Nakazawa
// https://en.wikipedia.org/wiki/Lehmer_random_number_generator

namespace splat {
    class lehmer_generator : public PRNG {
        public:
            lehmer_generator(uint32_t genSeed) : PRNG(genSeed) {
                seed = genSeed;
            }
            uint32_t generate() override {
                seed = (a * seed) % m;
                return seed;
            }
            std::string getName() override {
                return "lehmer";
            }
        private:
            uint64_t a = 7759097958782935LL;
            uint64_t m = 18055400005099021LL;
    };
}