feat(routes): add suggestions route

src/routes/index.ts

@@ -3,6 +3,7 @@ import imagesRouter from './images';
 import videosRouter from './videos';
 import configRouter from './config';
 import modelsRouter from './models';
+import suggestionsRouter from './suggestions';
 
 const router = express.Router();
 
@@ -10,5 +11,6 @@ router.use('/images', imagesRouter);
 router.use('/videos', videosRouter);
 router.use('/config', configRouter);
 router.use('/models', modelsRouter);
+router.use('/suggestions', suggestionsRouter);
 
 export default router;

src/routes/suggestions.ts

@@ -0,0 +1,46 @@
+import express from 'express';
+import generateSuggestions from '../agents/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';
+
+const router = express.Router();
+
+router.post('/', async (req, res) => {
+  try {
+    let { chat_history, chat_model, chat_model_provider } = req.body;
+
+    chat_history = chat_history.map((msg: any) => {
+      if (msg.role === 'user') {
+        return new HumanMessage(msg.content);
+      } else if (msg.role === 'assistant') {
+        return new AIMessage(msg.content);
+      }
+    });
+
+    const chatModels = await getAvailableChatModelProviders();
+    const provider = chat_model_provider || Object.keys(chatModels)[0];
+    const chatModel = chat_model || Object.keys(chatModels[provider])[0];
+
+    let llm: BaseChatModel | undefined;
+
+    if (chatModels[provider] && chatModels[provider][chatModel]) {
+      llm = chatModels[provider][chatModel] as BaseChatModel | undefined;
+    }
+
+    if (!llm) {
+      res.status(500).json({ message: 'Invalid LLM model selected' });
+      return;
+    }
+
+    const suggestions = await generateSuggestions({ chat_history }, 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;