server.js

import express from 'express';
import path from 'path';
import { fileURLToPath } from 'url';
import fetch from 'node-fetch';
import { config } from 'dotenv';

config();

// Setup __filename and __dirname
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const app = express();
const PORT = 3000;

// Replace with your OpenAI API key
const apiKey = process.env.API_KEY;

// Serve static files from the public directory
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.json());

// Handle the /api/chat endpoint
app.post('/api/chat', async (req, res) => {
    const messages = req.body.messages;

    const data = {
        model: 'gpt-4',
        messages: messages,
        max_tokens: 1024
    };

    try {
        const response = await fetch('https://api.openai.com/v1/chat/completions', {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${apiKey}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        });

        const responseData = await response.json();

        // Check for errors in the response
        if (responseData.error) {
            console.error('API Error:', responseData.error.message);
            return res.status(500).json({ error: responseData.error.message });
        }

        // Ensure choices are present
        if (responseData.choices && responseData.choices[0] && responseData.choices[0].message) {
            return res.json({ message: responseData.choices[0].message.content });
        } else {
            console.error('Unexpected API response structure:', responseData);
            return res.status(500).json({ error: 'Unexpected API response structure' });
        }
    } catch (error) {
        console.error('Fetch Error:', error);
        return res.status(500).json({ error: 'Fetch Error' });
    }
});

app.listen(PORT, () => {
    console.log(`Server is running on http://localhost:${PORT}`);
});