import { promises as fs, constants } from 'fs';
import path from 'path';
import yaml from 'js-yaml';
import { PackageItem } from '../theme/types';

const fileExist = (filePath) =>
  fs
    .access(filePath, constants.F_OK)
    .then(() => true)
    .catch(() => false);

const fetchPackages = async (): Promise<PackageItem[]> => {
  const docsDir = path.resolve(process.cwd(), '../packages');
  const fileNames = await (
    await fs.readdir(docsDir)
  ).map((filename) => ({ filename, directory: docsDir }));

  const packageJsons = await Promise.all(
    fileNames.map(async ({ filename, directory }) => {
      const filePath = path.resolve(directory, filename);
      const fileStat = await fs.lstat(filePath);

      if (!fileStat.isDirectory()) return null;

      const jsonFilePath = path.resolve(filePath, 'package.json');
      if (await fileExist(jsonFilePath)) {
        return JSON.parse(await fs.readFile(jsonFilePath, 'utf-8'));
      }

      const ymlFilePath = path.resolve(filePath, 'pubspec.yaml');
      if (await fileExist(ymlFilePath)) {
        return yaml.load(await fs.readFile(ymlFilePath, 'utf-8'));
      }

      return null;
    }),
  );

  return packageJsons;
};

export default fetchPackages;