// LifeTown Online — entry point: static file server + WebSocket upgrade.
import http from 'node:http';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { WebSocketServer } from 'ws';
import { GameServer } from './game.mjs';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const DIST = path.join(__dirname, '..', 'client', 'dist');
const PORT = Number(process.env.GAME_PORT || 7788);

const MIME = {
  '.html': 'text/html; charset=utf-8', '.js': 'text/javascript', '.mjs': 'text/javascript',
  '.css': 'text/css', '.json': 'application/json', '.png': 'image/png', '.jpg': 'image/jpeg',
  '.svg': 'image/svg+xml', '.ico': 'image/x-icon', '.wasm': 'application/wasm',
  '.woff2': 'font/woff2', '.mp3': 'audio/mpeg', '.ogg': 'audio/ogg', '.webp': 'image/webp',
};

function serveStatic(req, res) {
  let urlPath = decodeURIComponent(new URL(req.url, 'http://x').pathname);
  if (urlPath === '/') urlPath = '/index.html';
  let filePath = path.normalize(path.join(DIST, urlPath));
  if (!filePath.startsWith(DIST)) { res.writeHead(403); res.end('Forbidden'); return; }
  if (!fs.existsSync(filePath) || !fs.statSync(filePath).isFile()) {
    // SPA fallback
    filePath = path.join(DIST, 'index.html');
    if (!fs.existsSync(filePath)) { res.writeHead(503); res.end('LifeTown client is not built yet. Run: npm run build'); return; }
  }
  const ext = path.extname(filePath).toLowerCase();
  res.writeHead(200, {
    'Content-Type': MIME[ext] || 'application/octet-stream',
    'Cache-Control': ext === '.html' ? 'no-cache' : 'public, max-age=3600',
  });
  fs.createReadStream(filePath).pipe(res);
}

const server = http.createServer(serveStatic);

// Single WebSocket endpoint: /ws
const wss = new WebSocketServer({ noServer: true });
server.on('upgrade', (req, socket, head) => {
  const { pathname } = new URL(req.url, 'http://x');
  if (pathname === '/ws') {
    wss.handleUpgrade(req, socket, head, (ws) => game.onConnection(ws));
  } else {
    socket.destroy();
  }
});

const game = new GameServer(wss);

server.listen(PORT, () => {
  console.log(`[LifeTown] server listening on http://127.0.0.1:${PORT}`);
});