<?php
declare(strict_types=1);
namespace UseCases\Chat;
// @responsibility: Lädt Chat-Session mit allen Nachrichten
use Domain\Entity\ChatSession;
use Domain\Factory\ChatSessionFactory;
use Domain\Repository\ChatMessageRepositoryInterface;
use Domain\Repository\ChatSessionRepositoryInterface;
use Domain\ValueObject\SessionMetadata;
use Domain\ValueObject\SessionUuid;
class LoadChatSessionUseCase
{
public function __construct(
private ChatSessionRepositoryInterface $sessionRepo,
private ChatMessageRepositoryInterface $messageRepo
) {
}
/**
* Load session by UUID with all messages
*/
public function execute(string $uuid): ?ChatSessionDTO
{
$session = $this->sessionRepo->findByUuid($uuid);
if ($session === null) {
return null;
}
$messages = $this->messageRepo->findBySessionId($session->getId() ?? 0);
return new ChatSessionDTO($session, $messages);
}
/**
* Create a new session and return it
*
* @param array<string> $collections
*/
public function createNew(
string $model = 'claude-opus-4-5-20251101',
array $collections = ['documents'],
int $contextLimit = 5
): ChatSessionDTO {
$uuid = $this->sessionRepo->generateUuid();
$session = ChatSession::create($uuid, $model, $collections, $contextLimit);
$sessionId = $this->sessionRepo->save($session);
// Reload to get full data including timestamps
$savedSession = $this->sessionRepo->findByUuid($uuid);
return new ChatSessionDTO($savedSession ?? $session->withId($sessionId), []);
}
}