import { exec } from 'child_process';
import { readdir, stat } from 'fs/promises';
import { join, sep } from 'path';
import { promisify } from 'util';

const asyncExec = promisify(exec);

const loadDirectory = async (path: string): Promise<string[]> => {
  const files: string[] = [];
  const status = await stat(path);
  if (status.isDirectory()) {
    const filesInDir = await readdir(path);
    for (const file of filesInDir) {
      files.push(...(await loadDirectory(join(path, file))));
    }
  } else {
    files.push(path);
  }
  return files;
};

const syncChallenges = async () => {
  const ignore = ['.markdownlint.yaml', '_meta', 'english'];
  const basePath = join(process.cwd(), 'curriculum', 'challenges');
  const allLangs = await readdir(basePath);
  const filtered = allLangs.filter(lang => !ignore.includes(lang));
  // these will be paths
  const english = await loadDirectory(join(basePath, 'english'));
  for (const path of english) {
    for (const lang of filtered) {
      const targetPath = path.replace('english', lang);
      // we swallow the error here to detect if the file doesn't exist
      const status = await stat(targetPath).catch(() => null);
      if (!status) {
        console.table({ path, targetPath });
        const targetDir = targetPath.split(sep);
        targetDir.pop();
        console.log(`Syncing ${path.split('/english/')[1]}`);
        await asyncExec(
          `mkdir -p ${targetDir.join(sep)} && cp ${path} ${targetPath}`
        );
      }
    }
  }
};

void (async () => {
  await syncChallenges();
})();