import { readdir, readFile, stat } from 'node:fs/promises';
import path from 'node:path';

const dist = path.resolve('dist');
const failures = [];

async function walk(dir) {
  const entries = await readdir(dir, { withFileTypes: true });
  const files = [];

  for (const entry of entries) {
    const fullPath = path.join(dir, entry.name);
    if (entry.isDirectory()) {
      files.push(...(await walk(fullPath)));
    } else {
      files.push(fullPath);
    }
  }

  return files;
}

try {
  await stat(dist);
} catch {
  throw new Error('dist/ does not exist. Run npm run build first.');
}

const files = await walk(dist);
const jsFiles = files.filter((file) => file.endsWith('.js'));

if (jsFiles.length > 0) {
  failures.push(
    `Unexpected JavaScript assets:\n${jsFiles.map((file) => `- ${file}`).join('\n')}`
  );
}

for (const file of files.filter((candidate) => candidate.endsWith('.html'))) {
  const html = await readFile(file, 'utf8');
  const scripts = (
    html.match(/<script\b(?![^>]*type=["']application\/ld\+json["'])[^>]*>/gi) ?? []
  ).filter((script) => !script.includes('data-theme-script'));
  if (scripts?.length) {
    failures.push(`Unexpected script tag in ${file}:\n${scripts.join('\n')}`);
  }
}

if (failures.length > 0) {
  console.error(failures.join('\n\n'));
  process.exit(1);
}

console.log('No unexpected JavaScript found in dist/.');