import { readFileSync, readdirSync } from 'fs';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const root = join(__dirname, '..');
const jsDir = join(root, 'js');

const files = readdirSync(jsDir).filter(f => f.endsWith('.js'));

let errors = 0;
for (const file of files) {
  const path = join(jsDir, file);
  const source = readFileSync(path, 'utf-8');
  // Basic sanity: file is non-empty and has balanced braces
  if (source.length < 10) {
    console.log(`  FAIL  ${file}: too small`);
    errors++;
    continue;
  }
  const openBraces = (source.match(/{/g) || []).length;
  const closeBraces = (source.match(/}/g) || []).length;
  if (openBraces !== closeBraces) {
    console.log(`  FAIL  ${file}: unbalanced braces (${openBraces} open, ${closeBraces} close)`);
    errors++;
    continue;
  }
  const openParens = (source.match(/\(/g) || []).length;
  const closeParens = (source.match(/\)/g) || []).length;
  if (openParens !== closeParens) {
    console.log(`  FAIL  ${file}: unbalanced parentheses`);
    errors++;
    continue;
  }
  console.log(`  PASS  ${file}`);
}

const html = readFileSync(join(root, 'index.html'), 'utf-8');
if (html.includes('<canvas') && html.includes('<script')) {
  console.log('  PASS  index.html');
} else {
  console.log('  FAIL  index.html missing required elements');
  errors++;
}

const css = readFileSync(join(root, 'css', 'style.css'), 'utf-8');
if (css.includes('#game-canvas') && css.includes('#loading-screen')) {
  console.log('  PASS  css/style.css');
} else {
  console.log('  FAIL  css/style.css missing required selectors');
  errors++;
}

const required = ['main', 'flight-model', 'terrain', 'airport', 'aircraft', 'hud', 'ui', 'retro', 'sound'];
for (const mod of required) {
  const source = readFileSync(join(jsDir, `${mod}.js`), 'utf-8');
  if (source.includes('export class') || source.includes('export default')) {
    console.log(`  PASS  js/${mod}.js exports correctly`);
  } else {
    console.log(`  WARN  js/${mod}.js missing export`);
  }
}

console.log(`\n${errors === 0 ? 'All checks passed!' : `${errors} error(s) found.`}`);
if (errors > 0) process.exit(1);