const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const soap = require('soap');

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

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

const VIES_WSDL = 'https://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl';

// GET endpoint for validating VAT via URL
app.get('/api/validate-vat', async (req, res) => {
  const countryCode = req.query.countryCode;
  const vatNumber = req.query.vatNumber;

  if (!countryCode || !vatNumber) {
    return res.status(400).json({ error: 'Missing countryCode or vatNumber in query parameters.' });
  }

  try {
    const client = await soap.createClientAsync(VIES_WSDL);
    const [result] = await client.checkVatAsync({ countryCode, vatNumber });

    res.json({
      country: countryCode.toUpperCase(),
      VAT: vatNumber,
      name: result.name || null,
      address: result.address || null,
      valid: result.valid
    });
  } catch (error) {
    console.error('SOAP error:', error);
    res.status(500).json({ error: 'Failed to validate VAT number.' });
  }
});

// POST endpoint (original)
app.post('/api/validate-vat', async (req, res) => {
  const { countryCode, vatNumber } = req.body;

  if (!countryCode || !vatNumber) {
    return res.status(400).json({ error: 'Missing required fields.' });
  }

  try {
    const client = await soap.createClientAsync(VIES_WSDL);
    const [result] = await client.checkVatAsync({ countryCode, vatNumber });

    res.json({
      country: countryCode.toUpperCase(),
      VAT: vatNumber,
      name: result.name || null,
      address: result.address || null,
      valid: result.valid
    });
  } catch (error) {
    console.error('SOAP error:', error);
    res.status(500).json({ error: 'Failed to validate VAT number.' });
  }
});

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