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Editing: TranslationManager.php

<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace OC\Translation;

use InvalidArgumentException;
use OC\AppFramework\Bootstrap\Coordinator;
use OCP\IConfig;
use OCP\IServerContainer;
use OCP\IUserSession;
use OCP\PreConditionNotMetException;
use OCP\Translation\CouldNotTranslateException;
use OCP\Translation\IDetectLanguageProvider;
use OCP\Translation\ITranslationManager;
use OCP\Translation\ITranslationProvider;
use OCP\Translation\ITranslationProviderWithId;
use OCP\Translation\ITranslationProviderWithUserId;
use Psr\Container\ContainerExceptionInterface;
use Psr\Container\NotFoundExceptionInterface;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Throwable;

class TranslationManager implements ITranslationManager {
	/** @var ?ITranslationProvider[] */
	private ?array $providers = null;

public function __construct(
		private IServerContainer $serverContainer,
		private Coordinator $coordinator,
		private LoggerInterface $logger,
		private IConfig $config,
		private IUserSession $userSession,
	) {
	}

public function getLanguages(): array {
		$languages = [];
		foreach ($this->getProviders() as $provider) {
			$languages = array_merge($languages, $provider->getAvailableLanguages());
		}
		return $languages;
	}

public function translate(string $text, ?string &$fromLanguage, string $toLanguage): string {
		if (!$this->hasProviders()) {
			throw new PreConditionNotMetException('No translation providers available');
		}

$providers = $this->getProviders();
		$json = $this->config->getAppValue('core', 'ai.translation_provider_preferences', '');

if ($json !== '') {
			$precedence = json_decode($json, true);
			$newProviders = [];
			foreach ($precedence as $className) {
				$provider = current(array_filter($providers, function ($provider) use ($className) {
					return $provider instanceof ITranslationProviderWithId ? $provider->getId() === $className : $provider::class === $className;
				}));
				if ($provider !== false) {
					$newProviders[] = $provider;
				}
			}
			// Add all providers that haven't been added so far
			$newProviders += array_udiff($providers, $newProviders, function ($a, $b) {
				return ($a instanceof ITranslationProviderWithId ? $a->getId() : $a::class) <=> ($b instanceof ITranslationProviderWithId ? $b->getId() : $b::class);
			});
			$providers = $newProviders;
		}

if ($fromLanguage === null) {
			foreach ($providers as $provider) {
				if ($provider instanceof IDetectLanguageProvider) {
					if ($provider instanceof  ITranslationProviderWithUserId) {
						$provider->setUserId($this->userSession->getUser()?->getUID());
					}
					$fromLanguage = $provider->detectLanguage($text);
				}

if ($fromLanguage !== null) {
					break;
				}
			}

if ($fromLanguage === null) {
				throw new InvalidArgumentException('Could not detect language');
			}
		}

if ($fromLanguage === $toLanguage) {
			return $text;
		}

foreach ($providers as $provider) {
			try {
				if ($provider instanceof ITranslationProviderWithUserId) {
					$provider->setUserId($this->userSession->getUser()?->getUID());
				}
				return $provider->translate($fromLanguage, $toLanguage, $text);
			} catch (RuntimeException $e) {
				$this->logger->warning("Failed to translate from {$fromLanguage} to {$toLanguage} using provider {$provider->getName()}", ['exception' => $e]);
			}
		}

throw new CouldNotTranslateException($fromLanguage);
	}

public function getProviders(): array {
		$context = $this->coordinator->getRegistrationContext();

if ($this->providers !== null) {
			return $this->providers;
		}

$this->providers = [];
		foreach ($context->getTranslationProviders() as $providerRegistration) {
			$class = $providerRegistration->getService();
			try {
				$this->providers[$class] = $this->serverContainer->get($class);
			} catch (NotFoundExceptionInterface|ContainerExceptionInterface|Throwable $e) {
				$this->logger->error('Failed to load translation provider ' . $class, [
					'exception' => $e
				]);
			}
		}

return $this->providers;
	}

public function hasProviders(): bool {
		$context = $this->coordinator->getRegistrationContext();
		return !empty($context->getTranslationProviders());
	}

public function canDetectLanguage(): bool {
		foreach ($this->getProviders() as $provider) {
			if ($provider instanceof IDetectLanguageProvider) {
				return true;
			}
		}
		return false;
	}
}

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