import * as dotenv from 'dotenv';
import { fs, fsPath } from './libs';

export interface IReadOptions {
  path?: string;
}

const parentModuleDir = () => {
  const parts = __dirname.split('/');
  return parts
    .reverse()
    .splice(parts.indexOf('node_modules') + 1, parts.length)
    .reverse()
    .join('/');
};

const toPath = (options: IReadOptions = {}) => {
  return options.path || fsPath.join(parentModuleDir(), './.env');
};

/**
 * Determines whether an .env exists.
 */
export function exists(options: IReadOptions = {}) {
  return fs.existsSync(toPath(options));
}

/**
 * Reads in the configuration values if the `.env` file exists.
 */
export function read(options: IReadOptions = {}): any {
  return exists(options) ? dotenv.config({ path: toPath(options) }) : {};
}

// Load environment by default.
read();