<?php

namespace App\Security;

use Symfony\Component\Filesystem\Filesystem;

/**
 * class OpenSSL.
 *
 * @author Simon Vieille <simon@deblan.fr>
 */
class OpenSSL
{
    protected ?\OpenSSLAsymmetricKey $publicKey;
    protected ?\OpenSSLAsymmetricKey $privateKey;

    public function __construct(string $publicKeyPath, string $privateKeyPath, Filesystem $filesystem)
    {
        if ($filesystem->exists($publicKeyPath)) {
            $this->publicKey = openssl_pkey_get_public(file_get_contents($publicKeyPath));
        }

        if ($filesystem->exists($privateKeyPath)) {
            $this->privateKey = openssl_pkey_get_private(file_get_contents($privateKeyPath));
        }
    }

    /**
     * Encrypts data by using the public key.
     */
    public function encrypt($data): ?string
    {
        if (empty($this->publicKey)) {
            throw new \RuntimeException('Public key needed.');
        }

        openssl_public_encrypt($data, $result, $this->publicKey);

        return $result;
    }

    /**
     * Decrypts data by using the private key.
     */
    public function decrypt($data): ?string
    {
        if (empty($this->privateKey)) {
            throw new \RuntimeException('Private key needed.');
        }

        openssl_private_decrypt($data, $result, $this->privateKey);

        return $result;
    }

    public function decryptEntity(EncryptedEntityInterface $entity): EncryptedEntityInterface
    {
        foreach ($entity->getEncryptedProperties() as $property) {
            $getter = 'get'.$property;
            $setter = 'set'.$property;
            $encryptedValue = $entity->{$getter}();

            if (!is_resource($encryptedValue)) {
                continue;
            }

            $encryptedValue = stream_get_contents($encryptedValue, -1, 0);

            $entity->{$setter}($this->decrypt($encryptedValue));
        }

        return $entity;
    }

    public function encryptEntity(EncryptedEntityInterface $entity): EncryptedEntityInterface
    {
        foreach ($entity->getEncryptedProperties() as $property) {
            $getter = 'get'.$property;
            $setter = 'set'.$property;
            $value = (string) $entity->{$getter}();
            $entity->{$setter}($this->encrypt($value));
        }

        return $entity;
    }
}