const express = require('express');
const router = express.Router();
const { getContainerData } = require('../utils/dockerInspector');
const os = require('os');

router.get('/', async (req, res) => {
  try {
    const containers = await getContainerData();
    const hostInterfaces = os.networkInterfaces();
    const ip =
      hostInterfaces.en0?.find(i => i.family === 'IPv4')?.address ||
      hostInterfaces.eth0?.find(i => i.family === 'IPv4')?.address ||
      '127.0.0.1';

    const rows = containers
      .map(c => {
        const [host, container] = c.name.split('-', 2);
        if (!host || !container) return null;

        const safeContainer = container.replace(/_/g, '');
        const safeHost = host.replace(/_/g, '');
        const hasPorts = c.ports && c.ports.length > 0;
        const url = hasPorts ? `${ip}:${c.ports[0]}` : null;
        const domain = `${safeContainer}.${safeHost}.bray.io`;

        if (!url) return null;

        return {
          name: safeContainer,
          url,
          domain,
        };
      })
      .filter(Boolean);

    // Create a pretty text table
    const header = `NAME                | URL                    | DOMAIN`;
    const divider = `--------------------|------------------------|-----------------------------`;
    const lines = rows.map(row =>
      `${row.name.padEnd(20)}| ${row.url.padEnd(24)}| ${row.domain}`
    );

    const output = [header, divider, ...lines].join('\n');

    res.setHeader('Content-Type', 'text/plain');
    res.send(output);
  } catch (err) {
    console.error('Error building domain list:', err);
    res.status(500).send('Failed to generate domain mappings');
  }
});

module.exports = router;