'use strict';

const Fs = require('fs');
const Path = require('path');

// Module containing utility functions.
const Util = {

  // Parses a 16 bit number buffer.
  parse16BitBuffer: function (buffer) {
    return buffer[0] * 256 + buffer[1];
  },

  // Picks a random element from an array.
  pickRandom: function (array) {
    return array[Math.floor(Math.random() * array.length)];
  },

  // For a given path, requires all of the files and returns an array
  // with the results. If the directory contains any non-requireable file,
  // it will fail.
  loadFiles: function (path) {
    return new Promise(function (resolve, reject) {
      Fs.readdir(path, function (err, files) {
        if (err) {
          return reject(err);
        }

        let loadedFiles = [];

        for (let file of files) {
          let filePath = Path.join(path, file);
          let loadedFile;

          try {
            loadedFile = require(filePath);
          } catch (err) {
            return reject(err);
          }

          loadedFiles.push(loadedFile);
        }

        resolve(loadedFiles);
      });
    });
  }
};

module.exports = Util;