import express from 'express';
import compression from 'compression';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const ROOT = path.resolve(__dirname, '..');
const DIST = path.join(ROOT, 'dist');
const DATA = path.join(ROOT, 'data');
const UPLOADS = path.join(ROOT, 'public', 'uploads');
const NEWS_FILE = path.join(DATA, 'news.json');

const PORT = Number(process.env.PORT) || 3000;
const app = express();

app.disable('x-powered-by');
app.use(compression());

app.get('/api/health', (_req, res) => res.json({ ok: true, ts: Date.now() }));

app.get('/api/news.json', (_req, res) => {
  try {
    if (!fs.existsSync(NEWS_FILE)) {
      return res.json({ updatedAt: null, items: [] });
    }
    const stat = fs.statSync(NEWS_FILE);
    res.setHeader('Cache-Control', 'public, max-age=300');
    res.setHeader('Last-Modified', stat.mtime.toUTCString());
    res.sendFile(NEWS_FILE);
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

app.use('/uploads', express.static(UPLOADS, { maxAge: '7d', fallthrough: true }));

const FEED_FILE = path.join(DIST, 'feed.xml');
app.get(['/feed', '/feed/', '/feed/rss2', '/feed/rss2/', '/rss', '/rss.xml'], (_req, res) => {
  res.type('application/rss+xml; charset=utf-8');
  res.sendFile(FEED_FILE);
});

app.use(express.static(DIST, { maxAge: '1h', etag: true }));

app.get('*', (req, res) => {
  const candidate = path.join(DIST, req.path, 'index.html');
  if (fs.existsSync(candidate)) {
    return res.sendFile(candidate);
  }
  res.status(200).sendFile(path.join(DIST, 'index.html'));
});

app.listen(PORT, () => {
  console.log(`pushkinohistory-ru-v2 listening on :${PORT}`);
});