import {existsSync, mkdirSync, readdirSync, readFileSync, writeFileSync} from 'node:fs';
import {join, resolve} from 'node:path';

const projectRoot = resolve(process.cwd());
const gregFrameworkRoot = resolve(projectRoot, '..');
const wikiDir = join(gregFrameworkRoot, '.wiki');
const outDir = join(projectRoot, 'docs', 'legacy', 'wiki-import');

if (!existsSync(wikiDir)) {
  console.error(
    `Missing ${wikiDir}. Clone or restore the GitHub Wiki working tree there, then re-run this script.\n` +
      'Existing files under docs/legacy/wiki-import/ are left unchanged.',
  );
  process.exit(1);
}

mkdirSync(outDir, {recursive: true});

function collectMarkdownFiles(rootDir, prefix = '') {
  const entries = readdirSync(join(rootDir, prefix), {withFileTypes: true});
  const results = [];

  for (const entry of entries) {
    const relativePath = prefix ? join(prefix, entry.name) : entry.name;
    if (entry.isDirectory()) {
      results.push(...collectMarkdownFiles(rootDir, relativePath));
      continue;
    }

    if (entry.isFile() && entry.name.toLowerCase().endsWith('.md')) {
      results.push(relativePath);
    }
  }

  return results;
}

const files = collectMarkdownFiles(wikiDir);

for (const file of files) {
  const source = join(wikiDir, file);
  const sanitizedRelative = file.replace(/\s+/g, '-');
  const target = join(outDir, sanitizedRelative);
  const targetDir = resolve(target, '..');
  mkdirSync(targetDir, {recursive: true});
  const raw = readFileSync(source, 'utf8');
  writeFileSync(target, raw, 'utf8');
}

console.log(`Synced ${files.length} wiki files to ${outDir}`);