'use strict';

var path = require('path');
var helper = module.exports = {};

// Returns boolean whether filepath is dir terminated
helper.isDir = function isDir(dir) {
  if (typeof dir !== 'string') { return false; }
  return (dir.slice(-(path.sep.length)) === path.sep);
};

// Create a `key:[]` if doesnt exist on `obj` then push or concat the `val`
helper.objectPush = function objectPush(obj, key, val) {
  if (obj[key] == null) { obj[key] = []; }
  if (Array.isArray(val)) { obj[key] = obj[key].concat(val); }
  else if (val) { obj[key].push(val); }
  return obj[key] = helper.unique(obj[key]);
};

// Ensures the dir is marked with path.sep
helper.markDir = function markDir(dir) {
  if (typeof dir === 'string' &&
    dir.slice(-(path.sep.length)) !== path.sep &&
    dir !== '.') {
    dir += path.sep;
  }
  return dir;
};

// Changes path.sep to unix ones for testing
helper.unixifyPathSep = function unixifyPathSep(filepath) {
  return (process.platform === 'win32') ? String(filepath).replace(/\\/g, '/') : filepath;
};

/**
 * Lo-Dash 1.0.1 <http://lodash.com/>
 * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.4.4 <http://underscorejs.org/>
 * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
 * Available under MIT license <http://lodash.com/license>
 */
helper.unique = function unique() { var array = Array.prototype.concat.apply(Array.prototype, arguments); var result = []; for (var i = 0; i < array.length; i++) { if (result.indexOf(array[i]) === -1) { result.push(array[i]); } } return result; };

/**
 * Copyright (c) 2010 Caolan McMahon
 * Available under MIT license <https://raw.github.com/caolan/async/master/LICENSE>
 */
helper.forEachSeries = function forEachSeries(arr, iterator, callback) {
  if (!arr.length) { return callback(); }
  var completed = 0;
  var iterate = function() {
    iterator(arr[completed], function (err) {
      if (err) {
        callback(err);
        callback = function() {};
      } else {
        completed += 1;
        if (completed === arr.length) {
          callback(null);
        } else {
          iterate();
        }
      }
    });
  };
  iterate();
};
