import fs = require('fs');
import path = require('path');
import { Application } from '../interfaces';
import { appDir } from '../utils';

export default function(app: Application, pathToModules: string, prefix: string = null): void {
  pathToModules = path.resolve(appDir, pathToModules);

  if (!fs.existsSync(pathToModules)) return fs.mkdirSync(pathToModules);
  fs.readdirSync(pathToModules).forEach(moduleName => {
    if (moduleName[0] === '.') return; // skip hidden files and directories
    if (fs.lstatSync(`${pathToModules}/${moduleName}`).isFile()) return;
    
    let route = `/${moduleName}`;
    
    if (prefix) route = `/${prefix}/${moduleName}`;

    try {
      app.use(route, require(`${pathToModules}/${moduleName}/router`).default);
    } catch (exception) {
      app.use(require(`${pathToModules}/${moduleName}/root-router`).default);
    }
  });
}