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import express from 'express';
import generateSuggestions from '../chains/suggestionGeneratorAgent';
import { BaseChatModel } from '@langchain/core/language_models/chat_models';
import { getAvailableChatModelProviders } from '../lib/providers';
import { HumanMessage, AIMessage } from '@langchain/core/messages';
import logger from '../utils/logger';
import { ChatOpenAI } from '@langchain/openai';
const router = express.Router();
interface ChatModel {
provider: string;
model: string;
customOpenAIBaseURL?: string;
customOpenAIKey?: string;
}
interface SuggestionsBody {
chatHistory: any[];
chatModel?: ChatModel;
}
router.post('/', async (req, res) => {
try {
let body: SuggestionsBody = req.body;
const chatHistory = body.chatHistory.map((msg: any) => {
if (msg.role === 'user') {
return new HumanMessage(msg.content);
} else if (msg.role === 'assistant') {
return new AIMessage(msg.content);
}
});
const chatModelProviders = await getAvailableChatModelProviders();
const chatModelProvider =
body.chatModel?.provider || Object.keys(chatModelProviders)[0];
const chatModel =
body.chatModel?.model ||
Object.keys(chatModelProviders[chatModelProvider])[0];
let llm: BaseChatModel | undefined;
if (body.chatModel?.provider === 'custom_openai') {
if (
!body.chatModel?.customOpenAIBaseURL ||
!body.chatModel?.customOpenAIKey
) {
return res
.status(400)
.json({ message: 'Missing custom OpenAI base URL or key' });
}
llm = new ChatOpenAI({
modelName: body.chatModel.model,
openAIApiKey: body.chatModel.customOpenAIKey,
temperature: 0.7,
configuration: {
baseURL: body.chatModel.customOpenAIBaseURL,
},
}) as unknown as BaseChatModel;
} else if (
chatModelProviders[chatModelProvider] &&
chatModelProviders[chatModelProvider][chatModel]
) {
llm = chatModelProviders[chatModelProvider][chatModel]
.model as unknown as BaseChatModel | undefined;
}
if (!llm) {
return res.status(400).json({ message: 'Invalid model selected' });
}
const suggestions = await generateSuggestions(
{ chat_history: chatHistory },
llm,
);
res.status(200).json({ suggestions: suggestions });
} catch (err) {
res.status(500).json({ message: 'An error has occurred.' });
logger.error(`Error in generating suggestions: ${err.message}`);
}
});
export default router;
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