package services

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
)

// size in bytes of the client ids and secrets
const IDSecretSize = 32

func GenerateRandomHex(size int) (string, error) {
	raw := make([]byte, size)
	n, err := rand.Read(raw)
	if err != nil {
		return "", fmt.Errorf("failed to read from random generator: %w", err)
	}
	if n != size {
		return "", fmt.Errorf("failed to read from random generator (%d/%d)", n, size)
	}
	return hex.EncodeToString(raw), nil
}

func GenerateClientIDSecret() (string, string, error) {
	clientID, err := GenerateRandomHex(IDSecretSize)
	if err != nil {
		return "", "", fmt.Errorf("failed to generate client id: %w", err)
	}
	clientSecret, err := GenerateRandomHex(IDSecretSize)
	if err != nil {
		return "", "", fmt.Errorf("failed to generate client secret: %w", err)
	}
	return clientID, clientSecret, nil
}