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"content": "<?php\n\nnamespace Controller;\n\nuse Framework\\Controller;\nuse Infrastructure\\AI\\AIConfig;\nuse Infrastructure\\AI\\ChatService;\nuse Infrastructure\\Persistence\\SystemPromptRepository;\n\nclass ChatController extends Controller\n{\n private ChatService $chatService;\n private \\PDO $db;\n private SystemPromptRepository $systemPromptRepo;\n\n public function __construct()\n {\n $this->chatService = $this->initializeChatService();\n $this->db = $this->initializeDatabase();\n $this->systemPromptRepo = new SystemPromptRepository();\n }\n\n \/**\n * GET \/chat\n * Show chat interface with session list, create new session if none\n *\/\n public function index(): void\n {\n $sessions = $this->getSessions();\n\n \/\/ Create new session and redirect\n $uuid = $this->createSession();\n header('Location: \/chat\/' . $uuid);\n exit;\n }\n\n \/**\n * GET \/chat\/{uuid}\n * Show specific chat session\n *\/\n public function show(string $uuid): void\n {\n $session = $this->getSession($uuid);\n\n if ($session === null) {\n header('Location: \/chat');\n exit;\n }\n\n $messages = $this->getMessages($session['id']);\n $sessions = $this->getSessions();\n $authorProfiles = $this->getAuthorProfiles();\n $systemPrompts = $this->systemPromptRepo->findAllActive();\n\n $this->view('chat.index', [\n 'title' => $session['title'] ?? 'KI-Chat',\n 'session' => $session,\n 'messages' => $messages,\n 'sessions' => $sessions,\n 'authorProfiles' => $authorProfiles,\n 'systemPrompts' => $systemPrompts,\n ]);\n }\n\n \/**\n * GET \/chat\/sessions (HTMX partial)\n * Return session list HTML\n *\/\n public function sessionList(): void\n {\n $sessions = $this->getSessions();\n $this->view('chat.partials.session-list', [\n 'sessions' => $sessions,\n 'currentUuid' => $_GET['current'] ?? null,\n ]);\n }\n\n \/**\n * POST \/chat\/{uuid}\/message (HTMX)\n * Process message and return HTML response\n *\/\n public function message(string $uuid): void\n {\n $session = $this->getSession($uuid);\n\n if ($session === null) {\n echo '<div class=\"chat-error\">Session nicht gefunden.<\/div>';\n\n return;\n }\n\n $question = trim($_POST['message'] ?? '');\n $model = $this->validateModel($_POST['model'] ?? $session['model']);\n $collection = $this->validateCollection($_POST['collection'] ?? $session['collection']);\n $contextLimit = $this->validateContextLimit((int) ($_POST['context_limit'] ?? $session['context_limit'] ?? 5));\n $authorProfileId = $this->validateAuthorProfileId((int) ($_POST['author_profile_id'] ?? $session['author_profile_id'] ?? 0));\n $systemPromptId = (int) ($_POST['system_prompt_id'] ?? $session['system_prompt_id'] ?? 1);\n $temperature = $this->validateTemperature((float) ($_POST['temperature'] ?? $session['temperature'] ?? 0.7));\n $maxTokens = $this->validateMaxTokens((int) ($_POST['max_tokens'] ?? $session['max_tokens'] ?? 4096));\n",
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