backend/server.js

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

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

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

const algorithmsRoute = require('./routes/algorithms');
const pubmedRoute = require('./routes/pubmed');
const searchRoute = require('./routes/search');

app.use('/api/algorithms', algorithmsRoute);
app.use('/api/pubmed', pubmedRoute);
app.use('/api/search', searchRoute);

app.get('/api/health', (req, res) => {
  res.json({ status: 'OK', message: 'PubMed AI Explorer API is running' });
});

// Serve static files from the React app build directory
app.use(express.static(path.join(__dirname, '../frontend/dist')));

// Catch all handler: send back React's index.html file for any non-API routes
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, '../frontend/dist/index.html'));
});

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});