// server.js (Node.js Express example)
const express = require('express');
const axios = require('axios'); // or node-fetch
const cors = require('cors');

const app = express();
const PORT = process.env.PORT || 3001;

// Use CORS if your frontend is on a different origin
app.use(cors({
  origin: 'http://localhost:3000' // Replace with your frontend URL
}));

// Example proxy endpoint
app.get('/api/proxy/external-service', async (req, res) => {
  try {
    const externalApiKey = process.env.EXTERNAL_API_KEY; // Keep API key in environment variables
    if (!externalApiKey) {
      return res.status(500).json({ error: 'External API key not configured.' });
    }

    // Forward request to the external API
    // You might need to adjust headers, query params, or body based on the external API
    const externalApiResponse = await axios.get('https://external-api.com/data', {
      headers: {
        'Authorization': `Bearer ${externalApiKey}`, // Or 'x-api-key' etc.
        // Pass other necessary headers from client request if needed
      },
      params: req.query // Forward query parameters from client
    });

    res.json(externalApiResponse.data);
  } catch (error) {
    console.error('Error proxying request:', error.message);
    // Log full error details in development/staging, but send generic message to client
    res.status(error.response?.status || 500).json({ error: 'Failed to fetch data from external service.' });
  }
});

app.listen(PORT, () => {
  console.log(`Proxy server listening on port ${PORT}`);
});