import fs from 'node:fs';
import path from 'node:path';
import process from 'node:process';

const root = process.cwd();
const markdown = [];
const walk = (directory) => {
  for (const entry of fs.readdirSync(directory, { withFileTypes: true })) {
    if (entry.name === '.git' || entry.name === 'node_modules') continue;
    const absolute = path.join(directory, entry.name);
    if (entry.isDirectory()) walk(absolute);
    else if (entry.name.endsWith('.md')) markdown.push(absolute);
  }
};
walk(root);
const failures = [];
for (const file of markdown) {
  const text = fs.readFileSync(file, 'utf8');
  for (const match of text.matchAll(/\[[^\]]*\]\(([^)]+)\)/g)) {
    const raw = match[1].trim().replace(/^<|>$/g, '');
    const target = raw.split('#')[0];
    if (!target || /^[a-z][a-z0-9+.-]*:/i.test(target)) continue;
    const resolved = path.resolve(path.dirname(file), decodeURIComponent(target));
    if (!fs.existsSync(resolved)) failures.push(`${path.relative(root, file)}: missing link target ${target}`);
  }
}
if (failures.length) {
  console.error(failures.join('\n'));
  process.exit(1);
}
console.log(`Documentation links passed: ${markdown.length} Markdown files checked.`);