const fs = require('fs');
const path = require('path');
const dir = 'templates';
const files = fs.readdirSync(dir).filter((f) => f.endsWith('.html'));

for (const f of files) {
  const p = path.join(dir, f);
  let c = fs.readFileSync(p, 'utf8');
  const before = c;

  // 1. theme.config.X.  →  theme.config.X?.  （分组级安全导航，防止分组为 null 时 NPE）
  c = c.replace(/theme\.config\.([a-z_]+)\./g, 'theme.config.$1?.');

  // 2. nav_use_guide / nav_dev_guide 的 th:href 兜底，避免 @{null}
  c = c.replace(
    /\$\{theme\.config\.nav\?\.nav_use_guide\}/g,
    "${theme.config.nav?.nav_use_guide ?: '/'}"
  );
  c = c.replace(
    /\$\{theme\.config\.nav\?\.nav_dev_guide\}/g,
    "${theme.config.nav?.nav_dev_guide ?: '/'}"
  );

  if (c !== before) {
    fs.writeFileSync(p, c);
    console.log('✓', f);
  }
}
console.log('done');