added working code

.gitignore

@@ -0,0 +1,2 @@
+.env
+node_modules/

controllers/chatController.js

@@ -0,0 +1,65 @@
+// import axios from 'axios';
+// import Document from '../models/Document.js';
+
+// const MISTRAL_API_KEY = process.env.MISTRAL_API_KEY;
+// const MISTRAL_URL = "https://api.mistral.ai/chat/completions";
+
+// export const chatWithAI = async (req, res) => {
+//     try {
+//         const { department, message } = req.body;
+
+//         // Fetch relevant documents
+//         const docs = await Document.find({ department });
+//         const context = docs.map(doc => doc.content).join("\n");
+
+//         // Call Mistral API
+//         const response = await axios.post(
+//             MISTRAL_URL,
+//             {
+//                 messages: [{ role: "system", content: `You are an AI assistant for ${department} department.` },
+//                            { role: "user", content: `Based on these documents: ${context} \n User Query: ${message}` }]
+//             },
+//             { headers: { Authorization: `Bearer ${MISTRAL_API_KEY}` } }
+//         );
+
+//         res.json({ response: response.data.choices[0].message.content });
+//     } catch (error) {
+//         console.error(error);
+//         res.status(500).json({ error: "Error processing the request" });
+//     }
+// };
+
+import { Mistral } from '@mistralai/mistralai';
+import Document from '../models/Document.js';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+
+const MISTRAL_API_KEY = process.env.MISTRAL_API_KEY;
+console.log(MISTRAL_API_KEY);
+const client = new Mistral({ apiKey: MISTRAL_API_KEY });
+
+export const chatWithAI = async (req, res) => {
+    try {
+        const { department, message } = req.body;
+
+        // Fetch relevant documents
+        const docs = await Document.find({ department });
+        const context = docs.map(doc => doc.content).join("\n");
+
+        // Call Mistral API
+        const chatResponse = await client.chat.complete({
+            model: "mistral-large-latest",
+            messages: [
+                { role: "system", content: `You are an AI assistant for ${department} department.` },
+                { role: "user", content: `Based on these documents: ${context}\nUser Query: ${message} if you do not have exact information you can give general response of 1 to 1.5 line ` }
+            ]
+        });
+
+        res.json({ response: chatResponse.choices[0].message.content });
+    } catch (error) {
+        console.error(error);
+        res.status(500).json({ error: "Error processing the request" });
+    }
+};

models/Document.js

@@ -0,0 +1,9 @@
+import mongoose from 'mongoose';
+
+const documentSchema = new mongoose.Schema({
+    department: String,
+    type: String,
+    content: String
+});
+
+export default mongoose.model('Document', documentSchema);

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@mistralai/mistralai": "^1.5.0",
+    "axios": "^1.8.1",
+    "body-parser": "^1.20.3",
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.7",
+    "express": "^4.21.2",
+    "mongoose": "^8.12.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.9"
+  }
+}

routes/chatRoutes.js

@@ -0,0 +1,7 @@
+import express from 'express';
+import { chatWithAI } from '../controllers/chatController.js';
+
+const router = express.Router();
+router.post('/', chatWithAI);
+
+export default router;

server.js

@@ -0,0 +1,23 @@
+import express from 'express';
+import cors from 'cors';
+import dotenv from 'dotenv';
+import mongoose from 'mongoose';
+import chatRoutes from './routes/chatRoutes.js';
+
+dotenv.config();
+
+const app = express();
+app.use(express.json());
+app.use(cors());
+
+// Routes
+app.use('/api/chat', chatRoutes);
+app.get('/', (req, res) => {
+    res.send('Server is running');
+});
+console.log(process.env.PORT)
+
+const PORT = process.env.PORT || 5000;
+mongoose.connect(process.env.MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true })
+    .then(() => app.listen(PORT, () => console.log(`Server running on port ${PORT}`)))
+    .catch(err => console.error(err));