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"content": "<?php\n\ndeclare(strict_types=1);\n\nnamespace Controller;\n\n\/\/ @responsibility: HTTP-Endpunkte für KI-Chat (Sessions, Nachrichten, Export)\n\nuse Framework\\Controller;\nuse Infrastructure\\AI\\ModelConfig;\nuse Infrastructure\\Formatting\\ChatMessageFormatter;\nuse UseCases\\Chat\\ExportChatSessionUseCase;\nuse UseCases\\Chat\\ManageChatSessionsUseCase;\nuse UseCases\\Chat\\SendChatMessageUseCase;\n\nclass ChatController extends Controller\n{\n private ManageChatSessionsUseCase $sessionsUseCase;\n private SendChatMessageUseCase $messageUseCase;\n private ChatMessageFormatter $formatter;\n private ExportChatSessionUseCase $exportUseCase;\n\n public function __construct(\n ManageChatSessionsUseCase $sessionsUseCase,\n SendChatMessageUseCase $messageUseCase,\n ChatMessageFormatter $formatter,\n ExportChatSessionUseCase $exportUseCase\n ) {\n $this->sessionsUseCase = $sessionsUseCase;\n $this->messageUseCase = $messageUseCase;\n $this->formatter = $formatter;\n $this->exportUseCase = $exportUseCase;\n }\n\n public function index(): void\n {\n $uuid = $this->sessionsUseCase->createSession();\n header('Location: \/chat\/' . $uuid);\n exit;\n }\n\n public function show(string $uuid): void\n {\n $session = $this->sessionsUseCase->getSession($uuid);\n\n if ($session === null) {\n header('Location: \/chat');\n exit;\n }\n\n $this->view('chat.index', [\n 'title' => $session['title'] ?? 'KI-Chat',\n 'session' => $session,\n 'messages' => $this->sessionsUseCase->getMessages($session['id']),\n 'sessions' => $this->sessionsUseCase->getAllSessions(),\n 'authorProfiles' => $this->sessionsUseCase->getAuthorProfiles(),\n 'systemPrompts' => $this->sessionsUseCase->getSystemPrompts(),\n 'outputStructures' => $this->sessionsUseCase->getOutputStructures(),\n 'collections' => $this->sessionsUseCase->getAvailableCollections(),\n 'models' => ModelConfig::getAll(),\n 'defaultModel' => ModelConfig::getDefaultModel(),\n ]);\n }\n\n public function sessionList(): void\n {\n $this->view('chat.partials.session-list', [\n 'sessions' => $this->sessionsUseCase->getAllSessions(),\n 'currentUuid' => $this->getString('current') ?: null,\n ]);\n }\n\n public function message(string $uuid): void\n {\n $session = $this->sessionsUseCase->getSession($uuid);\n\n if ($session === null) {\n $this->view('chat.partials.error', ['error' => 'Session nicht gefunden.']);\n\n return;\n }\n\n $question = trim($_POST['message'] ?? '');\n $model = ModelConfig::validate($_POST['model'] ?? $session['model']);\n $sessionCollections = $this->decodeJson($session['collections'] ?? null) ?: ['documents'];\n $collections = $_POST['collections'] ?? $sessionCollections;\n $contextLimit = (int) ($_POST['context_limit'] ?? $session['context_limit'] ?? 5);\n $authorProfileId = (int) ($_POST['author_profile_id'] ?? $session['author_profile_id'] ?? 0);\n $systemPromptId = (int) ($_POST['system_prompt_id'] ?? $session['system_prompt_id'] ?? 1);\n $structureId = (int) ($_POST['structure_id'] ?? 0);\n $temperature = (float) ($_POST['temperature'] ?? $session['temperature'] ?? 0.7);\n $maxTokens = (int) ($_POST['max_tokens'] ?? $session['max_tokens'] ?? 4096);\n\n if ($this->sessionsUseCase->settingsHaveChanged($session, $model, $collections, $contextLimit, $authorProfileId, $temperature, $maxTokens)) {\n $this->sessionsUseCase->updateSettings($session['id'], $model, $collections, $contextLimit, $authorProfileId, $temperature, $maxTokens);\n }\n\n if ($question === '') {\n $this->view('chat.partials.error', ['error' => 'Bitte gib eine Frage ein.']);\n\n return;\n }\n\n if (!empty($collections)) {\n $compatibility = $this->sessionsUseCase->validateCollectionCompatibility($collections);\n if (!$compatibility['valid']) {\n $this->view('chat.partials.error', [\n 'error' => 'Collection-Fehler: ' . $compatibility['error'],\n 'details' => 'Bitte wähle nur Collections mit gleichem Embedding-Modell.',\n ]);\n\n return;\n }\n }\n\n $qualityCheck = isset($_POST['quality_check']) && $_POST['quality_check'] === '1';\n\n $response = $this->messageUseCase->execute(\n sessionUuid: $uuid,\n message: $question,",
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