package service

import (
	"me-fit/types"

	"crypto/rand"
	"encoding/base64"
	"log/slog"

	"github.com/google/uuid"
)

type RandomGenerator interface {
	Bytes(size int) ([]byte, error)
	String(size int) (string, error)
	UUID() (uuid.UUID, error)
}

type RandomGeneratorImpl struct {
}

func NewRandomGeneratorImpl() *RandomGeneratorImpl {
	return &RandomGeneratorImpl{}
}

func (r *RandomGeneratorImpl) Bytes(size int) ([]byte, error) {
	b := make([]byte, 32)
	_, err := rand.Read(b)
	if err != nil {
		slog.Error("Error generating random bytes: " + err.Error())
		return []byte{}, types.ErrInternal
	}

	return b, nil
}

func (r *RandomGeneratorImpl) String(size int) (string, error) {
	bytes, err := r.Bytes(size)
	if err != nil {
		return "", types.ErrInternal
	}

	return base64.StdEncoding.EncodeToString(bytes), nil
}

func (r *RandomGeneratorImpl) UUID() (uuid.UUID, error) {
	return uuid.NewRandom()
}