/* global module, __dirname */
'use strict';

var fs = require('fs');

/**
 * MockManager is in charge of finding and injecting the mock files. They can be
 * located either at the app level in apps/$APP/test/marionette/mocks/ or at the
 * global level in shared/test/integration
 * @param {Marionette.Client} client Marionette client to use.
 * @param {String} app App folder to look into
 * @constructor
*/
function MockManager(client, appName) {
  this.client = client;
  this.potentialDirs = [
    __dirname + '/../../../apps/' + appName + '/test/marionette/mocks/',
    __dirname + '/' // points to shared/test/integration/
  ];
}

MockManager.prototype = {
  inject: function(mocks) {
    mocks = Array.isArray(mocks) ? mocks : [mocks];
    mocks.forEach(function(mockName) {
      this._injectSingle(mockName);
    }, this);
  },

  _injectSingle: function(mockName) {
    var fileName = 'mock_' + mockName + '.js';
    var filePath = this._findFilePath(fileName);
    this.client.contentScript.inject(filePath);
  },

  _findFilePath: function(fileName) {
    var index = this.potentialDirs.findIndex(function(dir) {
      return this._isFileAccessible(dir + fileName);
    }, this);

    if(index === -1) {
      throw new Error(fileName + ' was not found');
    }

    return this.potentialDirs[index] + fileName;
  },

  _isFileAccessible: function(filePath) {
    try {
      fs.accessSync(filePath);
      return true;
    } catch(e) {
      return false;
    }
  }
};

module.exports = MockManager;