const express = require('express');
const cors = require('cors');
const path = require('path');
const fs = require('fs');
const os = require('os');

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

app.use(cors());

const pricingData = JSON.parse(
  fs.readFileSync(path.join(__dirname, 'data', 'pricing.json'), 'utf-8')
);

app.get('/api/pricing', (req, res) => {
  res.json(pricingData);
});

app.get('/api/pricing/:category', (req, res) => {
  const { category } = req.params;
  const validCategories = ['operators', 'groundLoopStyles', 'groundLoopTypes', 'accessControl'];
  if (validCategories.includes(category)) {
    return res.json(pricingData[category]);
  }
  res.status(400).json({ error: `Invalid category. Use: ${validCategories.join(', ')}` });
});

const clientDist = path.join(__dirname, '..', 'client', 'dist');
if (fs.existsSync(clientDist)) {
  app.use(express.static(clientDist));
  app.get('*', (req, res) => {
    res.sendFile(path.join(clientDist, 'index.html'));
  });
}

function getLocalIP() {
  const ifaces = os.networkInterfaces();
  for (const name of Object.keys(ifaces)) {
    for (const iface of ifaces[name]) {
      if (iface.family === 'IPv4' && !iface.internal) return iface.address;
    }
  }
  return 'localhost';
}

app.listen(PORT, '0.0.0.0', () => {
  const ip = getLocalIP();
  console.log(`\n  Local:   http://localhost:${PORT}`);
  console.log(`  Network: http://${ip}:${PORT}\n`);
});