package crypto

import (
	"crypto/rand"
	"encoding/binary"
	"log"
)

// Source : https://programming.guide/go/crypto-rand-int.html

type CryptoSource struct{}

func NewCryptoSource() *CryptoSource {
	return &CryptoSource{}
}

func (s CryptoSource) Int63() int64 {
	return int64(s.Uint64() & ^uint64(1<<63))
}

func (s CryptoSource) Seed(seed int64) {}

func (s CryptoSource) Uint64() (v uint64) {
	err := binary.Read(rand.Reader, binary.BigEndian, &v)
	if err != nil {
		log.Fatal(err)
	}
	return v
}