server.js

const express = require('express');
const axios = require('axios');
const cors = require('cors');
require('dotenv').config();

const app = express();
const port = process.env.PORT || 3000;

// Middleware
app.use(cors());
app.use(express.json());

// Serve static files
app.use(express.static('./'));

// POST endpoint for OpenAI conversation
app.post('/chat', async (req, res) => {
  try {
    // Extract message from request body
    const { message } = req.body;
    
    if (!message) {
      return res.status(400).json({ error: 'Message is required' });
    }

    // Call OpenAI API
    const response = await axios.post(
      'https://api.openai.com/v1/chat/completions',
      {
        model: 'gpt-3.5-turbo',
        messages: [
          { role: 'system', content: 'You are a helpful assistant.' },
          { role: 'user', content: message }
        ],
        max_tokens: 500
      },
      {
        headers: {
          'Authorization': `Bearer ${process.env.OPENAI_API_KEY}`,
          'Content-Type': 'application/json'
        }
      }
    );

    // Extract and return the assistant's message
    const assistantMessage = response.data.choices[0].message.content;
    res.json({ reply: assistantMessage });
    
  } catch (error) {
    console.error('Error calling OpenAI API:', error.response?.data || error.message);
    res.status(500).json({ 
      error: 'Failed to get response from OpenAI',
      details: error.response?.data || error.message 
    });
  }
});

// Start the server
app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}`);
});