package service

import (
	"context"
	"crypto/rand"
	"encoding/base64"
	"log/slog"
	"spend-sparrow/internal/types"

	"github.com/google/uuid"
)

type Random interface {
	Bytes(ctx context.Context, size int) ([]byte, error)
	String(ctx context.Context, size int) (string, error)
	UUID(ctx context.Context) (uuid.UUID, error)
}

type RandomImpl struct {
}

func NewRandom() *RandomImpl {
	return &RandomImpl{}
}

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

	return b, nil
}

func (r *RandomImpl) String(ctx context.Context, size int) (string, error) {
	bytes, err := r.Bytes(ctx, size)
	if err != nil {
		slog.ErrorContext(ctx, "Error generating random string", "err", err)
		return "", types.ErrInternal
	}

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

func (r *RandomImpl) UUID(ctx context.Context) (uuid.UUID, error) {
	id, err := uuid.NewRandom()
	if err != nil {
		slog.ErrorContext(ctx, "Error generating random UUID", "err", err)
		return uuid.Nil, types.ErrInternal
	}

	return id, nil
}