import express from 'express';
import cors from 'cors';
import { readFileSync, writeFileSync, existsSync } from 'fs';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';

const __dirname = dirname(fileURLToPath(import.meta.url));
const CONFIG_FILE = join(__dirname, 'config.json');

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

function loadConfig() {
  if (!existsSync(CONFIG_FILE)) return { hostinger_api_key: '' };
  try { return JSON.parse(readFileSync(CONFIG_FILE, 'utf8')); } catch { return { hostinger_api_key: '' }; }
}

function saveConfig(data) {
  writeFileSync(CONFIG_FILE, JSON.stringify(data, null, 2), 'utf8');
}

// GET configuração (mascara a key)
app.get('/api/config', (req, res) => {
  const cfg = loadConfig();
  res.json({ has_api_key: !!cfg.hostinger_api_key });
});

// POST salvar API key da Hostinger
app.post('/api/config/hostinger-key', (req, res) => {
  const { api_key } = req.body;
  if (!api_key?.trim()) return res.status(400).json({ error: 'api_key obrigatória' });
  const cfg = loadConfig();
  cfg.hostinger_api_key = api_key.trim();
  saveConfig(cfg);
  res.json({ ok: true });
});

// GET listar subdomínios via Hostinger API
app.get('/api/subdomains', async (req, res) => {
  const cfg = loadConfig();
  if (!cfg.hostinger_api_key) return res.status(400).json({ error: 'API key não configurada' });

  try {
    const r = await fetch('https://developers.hostinger.com/api/dns/v1/domains', {
      headers: { Authorization: `Bearer ${cfg.hostinger_api_key}`, 'Content-Type': 'application/json' }
    });
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// POST criar subdomínio no DNS da Hostinger
app.post('/api/subdomains', async (req, res) => {
  const cfg = loadConfig();
  if (!cfg.hostinger_api_key) return res.status(400).json({ error: 'API key não configurada' });

  const { domain, subdomain, type = 'A', value } = req.body;
  if (!domain || !subdomain || !value) return res.status(400).json({ error: 'domain, subdomain e value obrigatórios' });

  try {
    const r = await fetch(`https://developers.hostinger.com/api/dns/v1/domains/${domain}/records`, {
      method: 'POST',
      headers: { Authorization: `Bearer ${cfg.hostinger_api_key}`, 'Content-Type': 'application/json' },
      body: JSON.stringify({ type, name: subdomain, content: value, ttl: 300 })
    });
    const data = await r.json();
    res.json(data);
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

const PORT = process.env.PORT || 8019;
app.listen(PORT, () => console.log(`[subdominio-backend] porta ${PORT}`));