import * as fs from 'fs';
import * as path from 'path';

const IS_DIR_DEFINED = process.argv.indexOf('--dir');

if (IS_DIR_DEFINED < 0) {
  console.error(new Error('--dir not specificed').message);
  process.exit(1);
}

const DIR = path.join(process.cwd(), process.argv[IS_DIR_DEFINED + 1]);
const OUT_FILE = path.join(DIR, './index.d.ts');

fs.readdir(DIR, (error, result: string[]) => {
  if (error) {
    console.error(error);
    process.exit(1);
  }
  result = result.filter(file => !/index/.test(file));
  console.log(`Files found:\n\t${result.join('\n\t')}`);
  fs.writeFileSync(OUT_FILE, template(result));
});

function template(files: string[]) {
  return files.map(file => `/// <reference path="./${file}"/>`).join('\n')
}