import { existsSync } from 'node:fs';
import { join, resolve } from 'node:path';

const root = resolve(import.meta.dirname, '..');
const distDir = join(root, 'dist');
const port = Number(process.env.PORT || 7860);

if (!existsSync(join(distDir, 'index.html'))) {
  const proc = Bun.spawnSync(['bun', 'run', 'build'], {
    cwd: root,
    stdout: 'inherit',
    stderr: 'inherit',
    env: process.env,
  });

  if (proc.exitCode !== 0) {
    process.exit(proc.exitCode ?? 1);
  }
}

const mimeByExt = {
  '.css': 'text/css; charset=utf-8',
  '.html': 'text/html; charset=utf-8',
  '.ico': 'image/x-icon',
  '.js': 'text/javascript; charset=utf-8',
  '.json': 'application/json; charset=utf-8',
  '.map': 'application/json; charset=utf-8',
  '.png': 'image/png',
  '.svg': 'image/svg+xml',
  '.webmanifest': 'application/manifest+json; charset=utf-8',
};

function contentType(pathname) {
  const dot = pathname.lastIndexOf('.');
  if (dot === -1) return 'application/octet-stream';
  return mimeByExt[pathname.slice(dot)] ?? 'application/octet-stream';
}

function safePath(pathname) {
  const decoded = decodeURIComponent(pathname.split('?')[0] || '/');
  const normalized = decoded === '/' ? '/index.html' : decoded;
  return join(distDir, normalized.replace(/^\/+/, ''));
}

Bun.serve({
  hostname: '0.0.0.0',
  port,
  async fetch(request) {
    const url = new URL(request.url);
    const filePath = safePath(url.pathname);
    const file = Bun.file(filePath);

    if (await file.exists()) {
      const isAsset = url.pathname.startsWith('/assets/');
      return new Response(file, {
        headers: {
          'content-type': contentType(filePath),
          'cache-control': isAsset
            ? 'public, max-age=31536000, immutable'
            : 'no-cache',
        },
      });
    }

    const index = Bun.file(join(distDir, 'index.html'));
    return new Response(index, {
      headers: {
        'content-type': 'text/html; charset=utf-8',
        'cache-control': 'no-cache',
      },
    });
  },
});

console.log(`CarboAny Space server listening on 0.0.0.0:${port}`);